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- [Research] Prof. Sunkook Kim's Develops Nanoporus IGZO Applicable to Visible-to-NIR detecting photo transistor
- Prof. Sunkook Kim's (Department of Advanced Materials Science and Engineering) Develops Nanoporus IGZO Applicable to Visible-to-NIR detecting photo transistor Professor Sunkook Kim’s research team (Department of Advanced Materials Science and Engineering) proposed an approach for detecting wide spectral range using indium gallium zinc oxide (IGZO) phototransistors. IGZO phototransistors have limited applicability in broad spectral range detection; to solve this many research had been done using external photo-absorber. Our team developed nanoporous IGZO phototransistors, which can detect near infrared (NIR) without using any absorber. IGZO is optically transparent due to a bandgap of nearly 3–4 eV; thus, to extend the light detection range of IGZO, a laminated approach that introduces secondary materials has been suggested in previous reports. An additional optical absorption layer with a narrower bandgap on the IGZO thin film has been investigated in various studies. These absorption layers include CdSe, CdS, and PbS quantum dots; graphene dots; metal nanoparticles; and films of selenium. Heterojunctions of two-dimensional MoS2, graphene, and perovskite (CsPblxBr3-x) with IGZO films have also been investigated. To solve this problem, Sunkook Kim’s research team investigated the performance of nanoporous IGZO phototransistors. The nanopores throughout the entire thickness of ~ 30 nm in (IGZO) created by block co-polymer lithography. The process of creating a nonporous morphology is sophisticated and is accessed using a wafer-scale phototransistor array. See-through nanopores have edge functionalization with vacancies, which leads to a large subgap states within the conduction band minima and valence band maxima. These subgap states further contribute to detect NIR by employing photogating effect. The performance of the phototransistors is assessed in terms of photosensitivity (S) and photoresponsivity (R); both are of high magnitudes (S = 8.6×104 at ex = 638 nm and Pinc = 512 mW cm⁻2; R = 120 A W⁻1 at Pinc = 2 mW cm⁻2 for the same ex). Additionally, the 7 × 5 array of 35 phototransistors is effective in sensing and reproducing the input image by responding to selectively illuminated pixels. Prof. Kim said, “This study is significant for developing IGZO phototransistors for visible -NIR detection without using photo-absorber”. This study was supported by the SKKU Research Fellowship Program of Sungkyunkwan University and in part by the Basic Science Research Program through the National Research Foundation of Korea (NRF-2021R1A2B5B02002167, 2021M3H4A1A02056037, 2021R1I1A1A01060065, and 2021R1I1A1A01060078) and published on 13th June 2022 in ACS Nano (I.F:18.03) Paper name: Probing the Efficacy of Large-Scale Nonporous IGZO for Visible-to-NIR Detection Capability: An Approach toward High-Performance Image Sensor Circuitry DOI: https://doi.org/10.1021/acsnano.2c01773 Article by Sen Anamika
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- 작성일 2022-11-16
- 조회수 5300
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- [Research] Prof. Sunkook Kim develops large area MoS2 film for transparent phototransistor
- Prof. Sunkook Kim ((Department of Advanced Materials Science and Engineering) develops large area MoS2 film for transparent phototransistor by plasma assisted chemical vapor deposition technique. Professor Sunkook Kim’s research team (Department of Advanced Materials Science and Engineering) developed a route to synthesis low temperature plasma assisted large area MoS2 film for transparent phototransistor. Transparent devices on low-cost glass substrate using transition metal dichalcogenides (TMDs), required additional mechanical transfer which induces wrinkles, voids, cracks on the channel and hinder the mass production. TMDs such as MoS2 have attracted considerable attention or the fabrication of ultra-sensitive and ultrathin photodetectors because of their layer-dependent bandgap, optical transparency, high current on/off ratio, high carrier mobility, temperature stability, and large scalability. However, the synthesis of MoS2 required high temperature (> 600 °C), therefore growth on an inexpensive transparent substrate with low thermal budgets is challenging. Numerous techniques have been proposed for obtaining MoS2 at low temperature (< 400 °C) including MOCVD, ALD, PECVD etc. MOCVD required long sulfurization time for large area coverage, while ALD either required post annealing or produce rough film at low temperature. Few groups have used PECVD to grow large area MoS2 film at low temperature, however poor quality of the film hinder their application in transistor. Research team of Professor Sunkook Kim (Arindam Bala, Liu Na and all the authors) have synthesis large area MoS2 film on inexpensive slide glass (MARIENFELD.) by plasma assisted chemical vapor deposition technique (≤ 400 °C) and fabricated 7 × 7 array of transparent phototransistor without additional mechanical transfer, which can detect visible light (λ = 405 nm, 652 nm). Prof. Kim said, “This study is significant for developing low-cost smart glass technologies”. This research was supported in part by the National Research Foundation of Korea. (No. 2021R1A2B5B02002167, 2020H1D3A2A02103378, 2020R1I1A1A01052893) This work was supported by Institute of Information & communications Technology Planning & Evaluation (IITP) grant funded by the Korea government (MSIT) (No. 2021-0-01151) and published on 10th August 2022 in Advanced Functional Materials (I.F.: 19.92). Paper name: Low-Temperature Plasma-Assisted Growth of Large-Area MoS2 for Transparent Phototransistors. DOI: https://doi.org/10.1002/adfm.202205106 Article by Bala Arindam
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- 작성일 2022-11-16
- 조회수 3287
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- [Research] J.-Y. Choi / H. K. Yu joint research team develops Ultrahigh Porosity MgO Microparticles for Heat-Energy storage
- J.-Y. Choi / H. K. Yu joint research team develops Ultrahigh Porosity MgO Microparticles for Heat-Energy storage The joint research team led by Professor Jae-Young Choi at SKKU school of advanced materials science, and engineering and professor Hak Ki Yu at Ajou University department of materials science and engineering has developed Ultrahigh-Porosity MgO Microparticles for thermochemical heat-storage reaction with high stability and exceptional reactant permeability. Professor Choi is also the co-CEO of C&C materials. Regarding paper has been published on Advanced Materials with the title “Ultrahigh-Porosity MgO Microparticles for Heat-Energy Storage”. Research on renewable energy, and waste heat retrieval and conversion, has been the key for carbon neutrality. Among those research retrieval of industrial waste heat has earned significant interest. Naturally, the development of materials that can meet the criteria for industrial waste heat retrieval is now more important than ever. Fig. Schematic illustration of the strategy for synthesizing porous MgO and images of a porous MgO particle. The research team has introduced ultrahigh porous structure to magnesium oxide (MgO), a highly promising candidate for waste heat storage, to develop high-performance heat energy storing material. This Ultrahigh Porosity MgO has 4 times more surface area than commercial MgO, and therefore is free of swelling during heat storage, enabling heat storage capacity 7.2 times bigger than commercial MgO. This Ultra-high Porosity MgO is expected to serve as key material for chemically storing industrial waste heat, and the research team will carry out follow-up research to develop new materials and control the structure of existing materials to overcome obstacles of nanomaterials. Funded by the National Research Foundation of Korea (NRF), this work has been published on Advanced Materials (IF=32.086) in July 2022. ※ Title: Ultrahigh-Porosity MgO Microparticles for Heat-Energy Storage ※ Authors: Youngho Kim1, Xue Dong1, Sudong Chae1, Ghulam Asghar, Sungwoong Choi, Bum Jun Kim#, Jae-Young Choi#, Hak Ki Yu# ※ DOI: https://doi.org/10.1002/adma.202204775 1 : Lead author 2 : Corresponding author
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- 작성일 2022-09-19
- 조회수 3298
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- [Research] Artificial intelligence (AI) for understanding and characterizing the ductile-brittle behaviors of Mg based materials
- Artificial intelligence (AI) for understanding and characterizing the ductile-brittle behaviors of Mg based materials On June11th, the research team led by Prof. Kotiba Hamad at the school of advanced materials science and engineering (AMSE)published a paper titled “Brittle and ductile characteristics of intermetallic compounds in magnesium alloys : A large-scale screening guided by machine learning” in the Journal of Magnesium and Alloys (IF =11.8) which is ranked the 1st in the category of metallurgy & metallurgical engineering according to Clarivate’s Journal Citation Reports’ (JCR) ranking. This study is one of the woks conducted by this group to investigate the applicability and the potential of AI techniques in the field of materials discovery and design. The findings of this work showed that, by machine learning (ML), a technique of AI, the brittle-ductile characteristics of intermetallic compounds that form in magnesium-based alloys are reliably, accurately, and quickly predicted. The ML results were validated by theoretical calculations done by density functional theory (DFT), shown by the figure below. The results can facilitate the designing of magnesium alloys with high performance for structural applications. This led to say that, due to the exploding computational capabilities, artificial intelligence, in its machine learning subcategory, has been utilized heavily in the field of material discovery and design for its ability to construct data-driven models that are magnitude faster than conventional experimentation or even physics-driven modeling and simulation. The present research group; Kotiba Hamad (Professor), Russlan Jaafreh (PhD candidate), Kang Woo Seong (Graduate collaborator/Currently working in ‘Computer Systems and Intelligence Laboratory’), and Santiago Pereznieto (Masters Student), have been utilizing the capabilities of AI in the field of material science & engineering, and have published multiple papers regarding this topic in high-tier journals such as: ACS Applied Materials & Interfaces, Journal of Materiomics and many more. Related Links and professor’s website: - Russlan Jaafreh, Yoo Seong Kang, Kotiba Hamad, Journal of Magnesium and Alloys 2022, DOI: doi.org/10.1016/j.jma.2022.05.006. - Russlan Jaafreh, Yoo Seong Kang, and Kotiba Hamad, ACS Applied Materials & Interfaces 2021 13 (48), 57204-57213, DOI: doi.org/10.1021/acsami.1c17378 - Professor Kotiba’s Website: kotibahamad995.wixsite.com/aem-skku
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- 작성일 2022-08-16
- 조회수 3269
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- [Research] Prof. Yunseok Kim’s research team demonstrates a new strategy for highly enhanced ferroelectricty
- Prof. Yunseok Kim’s research team demonstrates a new strategy for highly enhanced ferroelectricty in HfO2-based ferroelectrics using ion bombardment - Published in ‘Science’ - These findings open pathways for nanoengineered binary ferroelectrics and subsequent ferroelectric-seminconductor integration. The research team* of Professor Yunseok Kim demonstrate a way to highly enhance ferroelecticity of HfO2-based ferroelectrics using ion bombardment. * Co-corresponding authors : Prof. Young-Min Kim(SKKU), Dr. Jinseung Heo (Samsung Advanced Institute of Technology), Dr. Sergei Kalinin (Oak Ridge National Laboratory, USA) Continuous advancement in nonvolatile and morphotropic beyond-Moore electronic devices necessitates the development of strategies that utilize the wealth of functionalities of complex materials at extremely reduced dimensions. The discovery of ferroelectricity in hafnium oxide (HfO2)–based ferroelectrics that are compatible with the semiconductor process has opened interesting and promising avenues of research. However, the origins of ferroelectricity and pathways to controlling it in HfO2-based ferroelectrics are still mysterious. We report that local ion bombardment can activate ferroelectricity in these materials. The possible competing mechanisms, including ion–induced molar volume changes, vacancy redistribution, vacancy generation, and activation of vacancy mobility, are discussed. These findings including the variation of ferroelectricity through defect engineering based on ion bombardment suggest additional possibilities for ferroelectricity enhancement in HfO2-based ferroelectrics. Furthermore, this approach can be directly applied to a semiconductor process without structural modification and, thus, can increase its applicability in next-generation electronic devices, such as ultrascaled ferroelectrics-based transistors and memories. Paper ￮ “Highly enhanced ferroelectricity in HfO2-based ferroelectric thin film by light ion bombardment”, Science 376(6594), 731-738 (2022) ￮ URL: https://www.science.org/doi/10.1126/science.abk3195 Webpage: http://spm.skku.edu
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- 작성일 2022-07-27
- 조회수 2891
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- [Research] Prof. Jeong Min Baik’s research group develops high-performing SCR catalysts for tackling air pollution
- Prof. Jeong Min Baik’s research group develops high-performing SCR catalysts for tackling air pollution - Low-temperature SCR catalyst developed impregnating highly-dispersed CuO–CeO2 nano-heterostructures - Published in Chemical Engineering Journal on Feb, 2022 Prof. Jeong Min Baik’s research group in tandem with Dr. Hong-Dae Kim (KITECH) and Prof. Hyesung Park (UNIST) developed nitrogen oxides (NOx) removal catalyst exhibiting superior catalytic performance at the low temperature (180oC~220oC). Selective Catalytic Reduction (SCR), is a widely-used industrial technique that converses the NOx—the leading cause of the air pollution—into N2 or H2O by using ammonia as a reducing agent. However, widely-used VO2/TiO2 catalysts have fatal setbacks such as causing catalytic deactivation owing to agglomeration with its limited performance at high operation temperature (250℃ or higher), not to mention its high maintenance costs. Therefore, developing a low-temperature catalyst showing high activation at about 200℃ increasingly gained importance, though, deactivation owing to SO2 and water used to be a challenge. To cope with, the research team fabricated ultra-small (<5 nm in size) CuO–CeO2 heterostructures with atomically well-defined interface followed by impregnation to V2O5–WO3-CeO2/TiO2 (2V-10Ce-1W/Ti) catalysts, achieving 44% higher Nox removal efficiency than the conventional catalysts. Also, they succeeded in raising K-factor (K16h/K0) from 0.60 to 0.83 under SO2 atmosphere, as well as the resistance towards the water. “We are soon going to check its industrial applicability through conducting empirical experiments. Through follow-up research, we will develop catalysts with a longer operation at below 200°C." Prof. Baik stated. In this regard, the research team has already applied for two patents. The experts expect that the cost for reducing NOx emissions from industrial sites such as factories and steel mills will be drastically reduced. This work was supported by the Ministry of Trade, Industry, and Energy, South Korea (MOTIE, 20005721), by the Mid-Career Researcher Program through the National Research Foundation of Korea (NRF) grant funded by the Korea government (NRF-2019R1A2C2009822), and by National R&D Program through the National Research Foundation of Korea(NRF) funded by Ministry of Science and ICT (2021M3C1C309). ※ Paper : Cu- and Ce- promoted nano-heterostructures on vanadate catalysts for low-temperature NH3-SCR activity with improved SO2 and water resistance ※ https://doi.org/10.1016/j.cej.2022.135427
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- 작성일 2022-04-22
- 조회수 2967
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- [Research] Prof. Sang-woo Kim’s research team develops world’s first ultrasound-mediated Fully Biodegradable and Implantable Triboe
- Prof. Sang-Woo Kim’s research team develops world’s first ultrasound-mediated Fully Biodegradable and Implantable Triboelectric Nanogenerator - Promising solution for eliminating the need for secondary surgery to remove the implantable medical devices (IMD) after the clinical timelines [Image] Prof. Sang-Woo Kim, Ph.D. Candidate Dong-Min Lee, and Najaf Rubab (from the left) The research team led by Prof. Sang-Woo Kim developed the world’s first ultrasound-mediated Fully Biodegradable and Implantable Triboelectric Nanogenerator (FBI-TENG). By mediating the ultrasound intensity, the FBI-TENG can be fully dissolved in the body in a short period of time at any specific moment with eliminating the need for secondary surgery to remove IMDs. Implantable electroceuticals, a class of technology that cures diseases (e.g., pain, and depression) in a short time (generally within 6 months), are of great interest in areas throughout medicine, and biomedical implants. However, they require the secondary surgery to remove the implants, which causes physical and psychological burden to patients. Many researches have been reported to develop implantable electroceuticals that equip biodegradable functions, but they encountered critical challenge, full biodegradation in a controlled manner within several minutes. Conventional transient materials were limited to exploit passive degradation, relying on their own thickness and material properties. In addition, they require at least several weeks to months for themselves to be fully degraded inside the body, which their residues can induce severe toxicity or negative health conditions. [Figure 1] Schematic of an Ultrasound-mediated in vivo biodegradable triboelectric nanogenerator Herein, the research team suggested a promising solution for minimizing the potential negative factors to health conditions, by developing the technology that dissolve the device within 30 minutes in a controlled manner using medically available ultrasound. [Figure 2] Theoretical and experimental studies of transient performances for FBI-TENG under ultrasound stimulation. The research team demonstrated that the FBI-TENG generates electricity without power degradation under the low-intensity ultrasound (1.0 W cm-2) and performs transient processes at the programmed time under high-intensity ultrasound (3.0 W cm-2). [Figure 3] Ex vivo demonstration of ultrasound triggered biodegradation FBI-TENG. The research team inserted the FBI-TENG into porcine tissue, a comparable anatomical structure to human, to conduct ex-vivo experiments. They found that the high-intensity ultrasound (3.0 W cm-2) can dissolve the device within few minutes inside the tissue. [Figure 4] Evaluation of Energy Generation of FBI-TENG The research team confirmed stable power generation (0.34 V and 3.20 μA) and complete biodegradation of the FBI-TENG, inserted at the 0.5 cm depth from the porcine epidermis, in 40 minutes by mediating ultrasound intensity. Prof. Sang-Woo Kim said, “it is an outstanding development that the FBI-TENG is the world’s first biodegradable and implantable TENG that can be fully biodegraded in a short time just by mediating the ultrasound intensity”. He added, “we expect the findings can be a promising approach for the next-generation medical device industries.” This work was financially supported by Nano Material Technology Development Program (2020M3H4A1A03084600) and Basic Science Research Program (2021R1A2C2010990) through the National Research Foundation (NRF) of Korea grant. This research was published in Science Advances on January 7, an international academic journal published by the American Association for Advancement of Science (AAAS) Paper: Ultrasound-mediated triboelectric nanogenerator for powering on-demand transient electronics
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- 작성일 2022-02-03
- 조회수 2531
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- [Research] Prof. Joohoon Kang’s research team develops Ternary operator applying area-selective chemical doping
- Prof. Joohoon Kang’s research team develops Ternary operator applying area-selective chemical doping - State-of-the-art semiconductor system which overcomes limitations of binary logic [Image] Dr. Dongjoon Rhee, Prof. Joohoon Kang, Master's candidate Myeongjin Jung, and Ph.D. Candidate Jihyun Kim (Clockwise from the left) Prof. Joohoon Kang’s research team (First authors; Jihyun Kim & Myeongjin Jung) developed a cutting-edge semiconductor device that enables ternary operation. Lately, the increasing demand for AI, self-driving, and IoT, the core technology of the 4th industrial revolution, has urged the need for large-scale information processing technologies and the development of high-performance semiconductors. Binary-based semiconductor devices that process information with 0 and 1 have physical limits to improve the integration. Therefore, multiple-valued logic systems have been suggested as an alternative to meet conditions such as shorter information processing time, higher performance, and lower power consumption. A conventional multiple-valued logic system was fabricated by forming two or more threshold voltages through combining semiconductor materials with heterogeneous work function values. However, there have been challenges in enlarging it due to low productivity when combining heterogeneous materials elaborately. [figure] Schematic of the system structure To cope with this, the research team developed multi-valued logic gates by forming large-area elemental semiconductor material film with solution processing method. Through area-selective chemical treatment, the team formulated regions with different work function on two-dimensional MoS2, the next-generation semiconductor material, and sequentially operated them to process ternary logical systems with stability. In addition, the team confirmed that various logical operations for large-scale information processing are also stably driven using the ternary device. “I expect the system to be applied in the semiconductor industry in the near future, in that the developed structure enables fabrication of large-area multiple-valued logic devices in wafer units without major changes in the conventional process.” Prof. Kang added. The team plans to design the optimum semiconductor material compound and apply this technology to subsequent multiple-valued logic studies to surpass the ternary logic system. This study was supported by National Research Foundation of Korea (NRF) grants funded by the Korean Government (MSIT) (2020R1C1C1009381 and 2020R1A4A2002806) and the Korea Basic Science Institute (KBSI) National Research Facilities and Equipment Center (NFEC) grant funded by the Korean Government (Ministry of Education) (2019R1A6C1010031). ※ Paper: Area-Selective Chemical Doping on Solution-Processed MoS2 Thin-Film for Multi-Valued Logic Gates https://www.skku.edu/skku/campus/skk_comm/news.do?mode=view&articleNo=94442&article.offset=0&articleLimit=10
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- 작성일 2022-01-26
- 조회수 1980
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- [Research] Prof. Hyun Suk Jung and Prof. Jai Chan Lee’s research team develops highly efficient halide perovskite solar cell module
- Prof. Hyun Suk Jung and Prof. Jai Chan Lee’s research team develops highly efficient halide perovskite solar cell modules fabrication technology using Formamidine disulfide oxidant - Suggesting a new approach for high-efficiency, high-stability large-area solar cell modules for commercialization of perovskite solar cells [Figure 1] Prof. Hyun Suk Jung, Prof. Jai Chan Lee, and Prof. Tae Kyu Ahn (Department of Energy Science) Prof. Hyun Suk Jung (Co-first author: Ph.D. candidate Jun Zhu), Prof. Jai Chan Lee (Co-first author: Ph.D. candidate Seul Young Park)'s research team, in tandem with Prof. Tae Kyu Ahn(Department of energy science) developed a new technology that increases the energy conversion efficiency of solar cell modules by applying strong oxidant into halide perovskite materials. Halide perovskites are an ideal solar cell material that exhibits high light absorption, long diffusion lengths of the photoetched electron, and holes. Recently, the solar cells that applied halide perovskites are getting greater attention than the existing ones, showing higher power conversion efficiency. However, primary intrinsic defects in FAPbI3 (i.e., iodine vacancy) induce strong electron localization and become deep traps and recombination centers upon photoexcitation. Consequently, the carrier lifetime is significantly reduced, and the superior properties are not fully utilized. The research team used formamidine disulfide dihydrochloride (FASCl) to remove the localized electrons on the perovskite defects. FAS2+ ion, as a strong oxidant as well as electron scavenger, takes other materials’ localized electrons and oxidize. [Figure 2] (1) Schematic diagrams of the introduction of the recombination center in the band gap of FAPbI3 by the localized charge in the iodine vacancy. (2) Schematic diagrams of the suppression of electron localization in the iodine vacancy by the FAS2+ ion in FAPbI3 Applying the first-principle method, the research team revealed that formamidine disulfide ion prevents the formation of the defect complex by stably integrating into perovskite structure and making the iodine vacancy lose the strongly localized electrons. The research team demonstrated an increased carrier lifetime of electrons and holes on the fabricated perovskite structure based on this strategy. In addition, the introduced formamidine disulfide interacted with the perovskite precursor and formatted an intermediate, which can improve perovskite crystallinity, grain size and thus enhance the device's performance and stability. [Figure 3] (Image 3) is a solar cell module manufactured using perovskite to which formalamide disulfide is added. (Image 4) solar cell modules exhibiting very high energy conversion efficiency in Large-area. excellent efficiency of more than 20% in large solar cell modules as well as unit cells. We expect this study to present a new approach for the commercialization of perovskite solar cells in near future." The research team said. This work was supported by the Basic Science Research Program through the National Research Foundation of Korea (No. 2019R1A2C2002661), the Institute of Information & Communications Technology Planning & Evaluation (IITP) grant funded by the Korean government (MSIT) (No. 2020-0-00541, Flexible Photovoltaic Device Module with Autonomous Power Supply for Smart Farm Wireless Composite IoT Sensor), Creative Materials Discovery Program through the National Research Foundation of Korea (NRF-2019M3D1A1078296 and NRF-2019M3D1A2104108) funded by the Ministry of Science and ICT, and the Basic Research Lab Program (2020R1A4A2002161) through the National Research Foundation of Korea. Computational resources were supported by KISTI supercomputing center (KSC-2020-CRE-0028). The research process was published on the Energy & Environmental science (IF 38.532) on July 30th (2021). ※ Paper title : Formamidine disulfide oxidant as a localised electron scavenger for >20% perovskite solar cell modules
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- 작성일 2022-01-26
- 조회수 2073
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- [Research] Prof. Sang-Woo Kim’s research team develops, inertia-driven in vivo energy harvesters
- Prof. Sang-Woo Kim’s research team develops, inertia-driven in vivo energy harvesters - Development of self-rechargeable cardiac pacemaker system based on body motion and gravity - Energy generation of 40 μW, similar to the power consumption of a pacemaker per step. - Expected to be used as a power source in various implantable medical devices in near future [Figure 1] Prof. Sang-Woo Kim, Dr. Hanjun Ryu Prof. Sang-Woo Kim (Corresponding author) and Dr. Hanjun Ryu (first author) developed an energy harvesting device similar to the size of a coin-type battery that converts mechanical energy generated by human body motion into electricity using the triboelectric nanogenerator in collaboration with Energy-Mining LTD.’s CEO Hyun-moon Park (co-first author) and Prof. Eue-Keun Choi (co-author) of Seoul National University Hospital. The development provides a breakthrough to solving the power source problem of implantable medical devices by suggesting self-rechargeable cardiac pacemaker systems inside the body using human body movement. [Figure 2] Body-implantable bioelectronics devices have faced major technological challenges as they require re-surgery to replace the implantable medical devices periodically due to limited battery life problems, posing financial burden and the health risks to patients. Specifically, owing to the worldwide increasing number of patients and reoperation cases for implantable cardiac pacemakers, research has been conducted to minimize the system's power consumption in order to extend the lifespan of the pacemakers. Although the research for minimizing the power consumption of the implantable medical devices has been conducted, there are major challenges due to its difficulty in reducing the power consumed by the system that requires equipping of extra functions. In addition, with the ongoing miniaturization of the implantable medical devices, the battery life of the devices is facing a major challenge in its extension. [Figure 3] The joint research team found clues in the fact that objects in the box move seamlessly due to inertia by external movement. Although it is placed in sealed environment, the system demonstrated successful electricity generation through inertia and gravity driven by body movement that drags the PFA/Cu/PFA (freestanding unit) downward to make contact with the bottom PVA-NH2 triboelectric layer. Based on I-TENG, the research team confirmed that energy produced can charge the battery. Fully encapsulated I-TENG was inserted at different part of a large animal and the research team confirmed various motion can generate electric energy through BLE-based wireless measurement system. Consequently, research team was able to reach the conclusion that the system can charge capacitors and batteries without harming human body. [Figure 4] Given the amount of energy generated by I-TENG, it is highly likely that the cardiac pacemaker 's life will be extended by more than 10%. Moreover, the output power may linearly increase by adding the number of integrated circuits. This experiment suggested a self-rechargeable cardiac pacemaker system and demonstrated its excellent operation. Professor Kim said, "This study is a triboelectrification-based in vivo energy harvesting technology that suggests the possibility of self-rechargeable implantable medical devices that eliminated charging difficulty of existing wireless power transfer technology as there are no electromagnetic waves and irritating heat generated." He added that "The findings realized the feasibility of in vivo recharge technology and I will work on improving power generation efficiency through follow-up study." [Figure 5] This work was supported by the Nano Material Technology Development Program (2020M3H4A1A03084600) and the Basic Science Research Program (2021R1A2C2010990) through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT. ※ Paper: Self-rechargeable cardiac pacemaker system with triboelectric nanogenerators ※ S.-W.K., H.R., and H.-M.P. conceived the idea. H.R., H.-M.P., H.S.M., T.Y.K., H.-J.Y., S.S.K., J.K., and B.K. fabricated, measured, and simulated the devices. M.-K.K. and E.-K.C. per-formed the in vivo experiments. S.-W.K., T.H.H., and E.-K.C. commented on the research outcomes. H.R., H.-M.P., E.-K.C., and S.-W.K. analyzed the data and wrote the manuscript. S.-W.K. supervised the overall conception and design of this project. All authors contributed to the discussion on the results and improved the manuscript.), [Figure 6] https://www.skku.edu/skku/campus/skk_comm/news.do?mode=view&articleNo=90943&article.offset=0&articleLimit=10&srSearchVal=%EA%B9%80%EC%83%81%EC%9A%B0
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- 작성일 2022-01-26
- 조회수 1974