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- Dong Su Kim in School of Advanced Materials Science & Engineering, reports a clue to improve the performance of the phot
- Dong Su Kim in School of Advanced Materials Science & Engineering, reports a clue to improve the performance of the phot Dong Su Kim (Prof. Hyung Koun Cho’ group) in School of Advanced Materials Science & Engineering, Sungkyunkwan University (SKKU) reports a clue to improve the performance of the photoelectrode that produces hydrogen by decomposing water using infinite solar energy Journal: Journal of Materials Chemistry A Paper Title: Atomically tunable photo-assisted electrochemical oxidation process design for the decoration of ultimate-thin CuO on Cu2O photocathodes and their enhanced photoelectrochemical performances Contents: Hydrogen energy is attracting attention as one of the new renewable energies that can replace fossil fuels. A clue came out to improve the performance of the Cu2O photoelectrode that produces hydrogen by decomposing water using infinite solar energy. Cho group’s research team developed a new photoelectrochemical oxidation process that controls the oxidation rate on the surface of the Cu2O thin film and synthesized a high-quality CuO Ultra-thin film. The photoelectrode of a heterojunction structure in which a CuO ultra-thin layer is stacked on Cu2O obtained a high photocurrent value of about 8.3 mA/cm2 under standard sunlight conditions. This is a description that is higher than all oxide hydrogen electrodes reported to date. DOI:https://doi.org/10.1039/D0TA06010K Dong Su Kim is a unified master’s and doctor’s course student under the supervision of Prof. Hyung Koun Cho in School of Advanced Materials Science & Engineering, Sungkyunkwan University (SKKU). His main research interests include the electrochemical deposition of optoelectronic materials and their applications. The recent work is based on high-efficiency photoelectrochemical cells using oxide semiconductors. Chronoamperometry data of photo-assisted electrochemical oxidation process, open-circuit potential (OCP) enhanced by stacked structure
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- 작성일 2021-06-11
- 조회수 4305
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- Prof. Miso Kim Awarded the Prime Minister’s Commendation at Science, Information and Communicat
- Prof. Miso Kim Awarded the Prime Minister’s Commendation at Science, Information and Communication Day [Image] Prof. Miso Kim (School of Advanced Materials Science and Engineering) Prof. Kim are awarded the Prime Minister’s Commendation at 2021 Science, Information and Communication Day. Prof. Kim received the PM’s commendation in the science and technology promotion sector for her contribution to successfully implement the “Meta Energy Harvesting System,” a unique convergence research technology that created synergy between meta materials and energy harvesting technology and help securea leading international position in the field. “I think the PM’s commendation is a generous award for me. I believe that they gave me the award to encourage me to work harder. I will do my best to contribute not only to the science and technology community but also to the society. In addition, I personally feel very meaningful and grateful because it is thefirst award I won since I was appointed to Sungkyunkwan University,” says Prof. Kim.
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- 작성일 2021-06-01
- 조회수 4343
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- Center for Next-generation Talent Development, Selected for Industrial Innovation Talent Growth Support Project
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Center for Next-generation Talent Development, Selected for Industrial Innovation Talent Growth Support Project [Image] Prof. Donghwan Kim in the School of Chemical Engineering SKKU is pleased to announce that it is selected for the
project organized by the Ministry of Trade, Industry and Energy (Department in charge: Korea Institute for Advancement of Technology). The “Center for Next-generation Talent Development” is selected for this project and will receive approx. 3 billion won of government funding for three years. The project faithfully carried out the first phase of the project from 2019 to 2020 and dispatched 28 outstanding researchers to seven countries. Starting this year, it plans to provide full support for 6-12 months of overseas dispatch research by selecting potential master’s, doctorate, or post-doc researchers by collaborating with excellent overseas institutions in next-generation semiconductors and future automobiles. “We will build an open innovation platform in the field of innovative growth and support the growth of innovative engineers who create global values” Prof. Donghwan Kim, the researcher director, said. For more information, please check the website of Precision Biology Research Center (pbrc.skku.edu). -
- 작성일 2021-05-04
- 조회수 4514
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- Prof. Joshua Jackman Developed a Pollen Sponge from Natural Materials
- Prof. Joshua Jackman Developed a Pollen Sponge from Natural Materials - Expecting replacement of plastics with eco-friendly materials using pollen and solution of water pollution [Image 1] Oil absorption capacity of pollen sponge Sungkyunkwan University announces that Prof. Joshua Jackman and Dr. Youngkyu Hwang in Department of Chemical Engineering along with Prof. Namjun Cho at Nanyang Technological University (NTU) developed a pollen sponge from natural materials including sunflower bee pollen, which can solve water pollution such as oil spills in the ocean. Lately, as interest in the development of eco-friendly materials has increased due to the seriousness of environmental pollution, research using natural materials has been in the spotlight. Especially, pollen, as it is considered the “diamond of biopolymers”, it has outstanding structural properties such as chemical and mechanical stability. However, most of pollen is discarded except for the amount used for moisture. Hence, the research team converted pollen into microgel particles based on a simple chemical process. By using pollen-based microgel particles, the team made a hydrophobic sponge and it exhibited that the sponge’s absorption capacity is 9.7 to 29.3g/g or more. The range is comparable to commercial polypropylene absorbents (8.1-24.6 g/g), and it has been found to be able to selectively absorbs pollutants such as organic solvents, gasoline, and motor oil. [Image 2] Sponge made using pollen The team said, “Pollen materials, which are produced in plants and mostly discarded, will one day replace widely used plastics and help curb the global problem of plastic pollution.” [Image 3] Left-up pollen, Right-up pollen SEM images, Left-down pollen sponge, Right-down pollen sponge SEM images The research team plans expand the size of sponge in order to meet the expectation of industries and to test it in actual environment in cooperation with non-governmental organization and international partners. Prof. Joshua Jackman and Prof. Namjun Cho are the co-authors and Dr. Youngkyu Hwang is the first author of this study, and the result was published online in the Advanced Functional Materials (Impact Factor=16.836, JCR ranking Top 4%), a world-renowned journal on March 12 (Fri). ※ Title of paper : Colloid‐Mediated Fabrication of a 3D Pollen Sponge for Oil Remediation Applications ※ Source : https://onlinelibrary.wiley.com/doi/10.1002/adfm.202101091
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- 작성일 2021-04-23
- 조회수 4400
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- Prof. Jinkee Lee Developed a 3D Liquid Transporting Diode Surface Using Nature-inspired Technology
- Prof. Jinkee Lee Developed a 3D Liquid Transporting Diode Surface Using Nature-inspired Technology Sungkyunkwan University (President Dong Ryeol Shin) announces that Prof. Jinkee Lee in School of Mechanical Engineering & Institute of Quantum Biophysics has developed a 3D liquid transporting diode surface using nature-inspired technology (first author Dr. MinKi Lee). This liquid transporting system has advantages for easy fabrication, cost-effectiveness, high scalability and shows the world's highest performance with novel 3D structure. When a liquid droplet is dispensed on the surface, the liquid transports uni-directionally by the passive capillary control from the structures of the liquid diode. Up to now, diode surfaces have been manufactured using lithography processes or 3D printer, which have drawbacks of limited size with complicated manufacturing processes, and also they show low liquid transport performance. Many researchers have been investigating the diode surface but it is quite challenging to increase both the transport performance and the ease of surface manufacturing, simultaneously. [Image 1] Prof. Jinkee Lee, Dr. MinKi Lee Prof. Jinkee Lee developed nature-inspired diode surface, which mimics the surface from nature such as horned lizard and pitcher plant. The 3D diode surface has a wedge structure consisting of repeating saw-like V-grooves. This surface utilizes the capillary force generated by the 3D topographical shape that pins liquid at one size and makes it flow to the other side. The fabrication of 3D diode surface is easy, fast, cost-effective and scalable because it is processed simply using a laser cutter. Professor Jinkee Lee said, “This 3D water transport diode surface can be applied as an original technology applying to microfluidic diagnostic chips, material synthesis, heat transfer enhancement and even fog collection because of its superior performance and easy fabrication.” [Image 2] Powerless standalone microfluidic transport system using surface structures of plants and animals This study was supported by the National Research Foundation of Korea (NRF; 2020R1A2C3010568) and the Korea Environment Industry & Technology Institute (KEITI; 2019002790003), and was published online on March 20, 2021 in Advanced Functional Materials (IF=16.836). ※ Title of paper: “Enhanced Liquid Transport on a Highly Scalable, Cost‐Effective, and Flexible 3D Topological Liquid Capillary Diode”
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- 작성일 2021-04-19
- 조회수 4319
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- Prof. Jeong Min Baik’s Research Team Suggest a New Paradigm of Study on Thermoelectric Energy-harvesting
- Prof. Jeong Min Baik’s Research Team Suggest a New Paradigm of Study on Thermoelectric Energy-harvesting - highest output voltage of BisbTe-based thermoelectric generator - published in ACS Energy Letters on February 2021 [Image] Prof. Jeong Min Baik (School of Advanced Materials Science and Engineering, SKKU) and Prof. Jae Sung Son (School of Materials Science and Engineering, UNIST) Prof. Baik’s research team and Prof. Son’s research team developed a new technique to increase the output voltage of a thermoelectric generator that does not involve material modification. Thermoelectric energy-harvesting is a technology that produces useful energy by utilizing temperature differences at both ends of the material when heat is applied from the outside. It has attracted a great deal of research interest due to its simplicity, minimal maintenance requirements, low cost, and reliability. It provides a good solution for sustainable energy generation from ambient heat sources. So far, various types of TE materials, including Bi2Te3, SnTe, PbTe, SnSe, etc., have been developed, and most research has been devoted to enhancing the materials’ ZT values using various methods such as nanostructuring, band structure engineering, etc. However, despite recent enhancements in efficiency, major issues with TE power generation technology remain, such as ultralow output voltages and consequent low-energy conversion efficiency, which are rooted in the intrinsic properties of TE materials. As a solution to these challenges, they created negative charges on the dielectric surface on the low temperature which caused the electric potential difference across the two electrodes to increase and achieved the highest output voltage. In addition, the team successfully demonstrated that the wind increased the output voltage without a significant decrease in wind speed through the pinwheel. Prof. Baik said “This research is a new method of energy convergence research that can present a new direction to overcome the limitations of thermoelectric energy-harvesting.” The research team has already applied for two related patents and is developing technologies that reach commercialization through study on non-contact thermoelectric energy-harvesting. This work was supported by the Mid-Career Researcher Program through a National Research Foundation of Korea (NRF) grant funded by the Korean government (NRF2019R1A2C2009822), by a National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (2019R1A4A1029237), and by the Ministry of Trade, Industry and Energy (MOTIE, 2005721, Korea). It was published in ACS Energy Letters (IF: 19.003, JCR Ranking: 1.852 %), a world-renowned energy journal on February 2021. ※ Paper: Triboelectric Charge-Driven Enhancement of the Output Voltage of BiSbTe-Based Thermoelectric Generators ※ https://doi.org/10.1021/acsenergylett.0c02483
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- 작성일 2021-04-07
- 조회수 4664
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- Successfully Developed Technology of Making Wafer-scale MoS2-WS2 Vertical Heterostructures Using Low Temperature Plasma
- Successfully Developed Technology of Making Wafer-scale MoS2-WS2 Vertical Heterostructures Using Low Temperature Plasma - Joint research team composed of Prof. Tae-Sung Kim and Ji-Won Seok from the Department of Electrical Engineering at Sungkyunkwan University and Ph.D. Hyung-woo Kim from Korea Institute of Machinery & Materials - Published in ACS Nano, an international academic journal online on January 7 (Thur) [Image 1] From the left – Ph.D Hyung-Woo, Prof. Tae-Sung Kim and Ji-Won Seok The joint research team (1st author Hyun-Ho Seok, Yonas T. Megra, Chaitanya Kanade) was pleased to announce that they developed the technology of making 4 inches wafer-scale MoS2-WS2 vertical heterostructures for the first time. The MoS2-WS2, representative transition metal dichalcogenides, are materials with different band gaps, and research for next-generation electronic device applications is being actively conducted. In particular, it is possible to adjust the band gap if the MoS2-WS2 are composed of vertical heterostructure, however, it has been difficult to manufacture a uniform heterostructure. In response, the research team developed the technology to manufacture 4 inches of wafer-scale MoS2-WS2 vertical heterostructures via single step penetration sulfurization by PE-CVD at 300°C. It has developed a simple yet effective method of manufacturing heterostructure materials that use low-temperature plasma to sulfurize heterogeneous metal layers (molybdenum and tungsten) and applied the related technologies for a domestic patent. Moreover, the team analyzed the interfacial adhesion between large-scale heterostructure and the wafer through experiments with the concept of destructive mechanics and verified the structural stability of the MoS2-WS2 vertical heterostructures. [Image 2] Illustration of the 2D transition material MoS2-WS2 and time-dependent conditions Prof. Tae-Sung Kim said “It was the first time implementing the heterostructure between transition metal and it was implemented using synthesis method which has the advantage of low temperature process, high reproducibility, and uniformity. I expect that it will be able to accelerate progress and commercialization in research on heterostructures.” This study was conducted with the support of National Research Foundation of Korea (NRF-2017R1A2B3011222, NRF-2019R1A2C2089785) and Korea Institute of Machinery & Materials. It was published in ACS Nano (IF: 14.588, JCR Top 10%), an international journal in the field of Material Science and Multidisciplinary online on January 7 (Thur). ※ Title: Low-Temperature Synthesis of Wafer-Scale MoS2-WS2 Vertical Heterostructures by Single-Step Penetrative Plasma Sulfurization
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- 작성일 2021-04-02
- 조회수 4651
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- A research team led by Professor Baek Jung-min of Material Engineering, Development of High Power Friction Generator
- A research team led by Professor Baek Jung-min of the Department of New Materials Engineering, Development of High Power Friction Generator with Non-Contact Method - Development of contactless friction generator by introducing C60 functionalized polyimide - Energy &Environmental Science, an international journal published online in January 2021 Professor Baek Jung-min's research team at the Department of New Materials Engineering developed a C60-functional polyimide with UNIST's Department of Energy and Chemical Engineering Professor Yang Chang-deok and Professor Lee Joon-hee's research team to develop a high-power nanogenerator. Friction generators, which use contact electrification to convert nearby mechanical energy into useful electrical energy when two different substances rub against each other, are used to power small electronic devices and to detect momentary stimuli in electronic skin, touchscreen, medical devices and security systems. However, physical contact between the two surfaces has posed problems such as reduced output power due to material wear, the need for device replacement, and noise from operation. To address this problem, non-contact frictional electrical generators have recently emerged as an alternative, but there is a problem of decreasing electrical power as the distance between the two materials increases. The researchers selected the carbon isotope C60 and introduced it as a pendant to the polyimide developed in the previous study in order to break through the above limits and give the material a high charge collection characteristic. The result showed 4.3 times higher power and 3 times higher charge maintenance efficiency compared to PFA fluoride-based nanogenerators. Furthermore, based on its excellent characteristics, the researchers applied it to the world's first non-contact door lock and car speed sensors to show excellent performance and device stability. In the case of materials with carbon isotopes developed in this study, the possibility of actual application introduction and the level of non-contact friction elements were high. Professor Baek Jung-min said, "This study can be applied to not only high-efficiency energy harvesting technologies in the future but also to various non-act sensor technologies to prevent the spread of viruses, so it can prevent the spread of viruses such as coronavirus infection-19. This study was selected and supported as a follow-up to the Samsung Future Development Project in December 2017, and was published online in January 2021 in the international journal Energy &Environmental Science. ※ 논문명 : Sustainable highly charged C60-functionalized Polyimide in non-contact mode triboelectric nanogenerator ※ https://doi.org/10.1039/D0EE03057K
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- 작성일 2021-01-24
- 조회수 4644
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- Professor Seo Young-deok of Chemical Engineeiring, The world's first discovery of nanoparticle photovoltaic phenomenon
- Professor Seo Young-deok of the Department of Chemical Engineering/Polymer Engineering, World's first discovery of nanoparticle photovoltaic phenomenon with a series of light amplification reactions – Nature's cover decoration - Professor Seo Young-deok (Professor of Chemical Engineering/Polymer's College of Vocal Studies-Professor of Chemical Studies) and the US/Poland Joint Research Team; Selected as Cover Article dated January 14, 2021 by Nature magazine (IF=42.8), the world's most prestigious magazine. - It is expected to advance commercialization of new technologies in the future by utilizing optical nanoparticles such as bio-medical field, advanced IoT field, and renewable energy field. - Co-authored by: Seo Young-deok, professor of vocal and chemical engineering at Department of Chemical Engineering/Polymer Engineering (Director of GRL Project) and P. James Schuck, professor of Columbia University (Director of GRL Project) - Exclusive first author: Lee Chang-hwan, Ph.D. student at Columbia University in the U.S. (visited by Professor Seo Young-deok's laboratory from May to August 2020). - Co-author: Nam Sang-hwan Research Institute (Korea Chemical Research Institute) The world's first discovery of "Photon Avalanche", which shoots small light energy into nanomaterials, causes a chain of amplification reactions of light in the material and releases larger light energy, was selected as a cover paper for Nature. ○ In general, when light energy is absorbed, some of the materials are consumed by heat energy, and the rest are released by light of less energy than the first absorbed light. Unlike this, in most substances, a downward transformation occurs, in some elements, an upward transformation occurs. In other words, it absorbs light from a small amount of energy and emits light from a larger amount of energy. ○ UpConversion Nano Particle (UCNP) allows small infrared rays to be used as a light source, so there is less noise and does not damage the sample because it uses small energy because light does not reach foreign substances other than the sample to be measured. Due to these advantages, upward conversion materials are likely to be used in next-generation bio-medical technologies, IoT technologies, and renewable energy technologies, so research has been actively conducted recently. ○ However, up-conversion nanoparticles (UCNPs) are currently not commercialized because their photo-conversion efficiency* is very low at less than 1%. This is the first time that a special upward-transforming nanoparticle, "light-burning nanoparticle," has been found to solve these obstacles. The photovoltaic nanoparticles found by the research team can increase the light conversion efficiency by 40%, which is very higher than 1% of the existing upward conversion nanoparticles. * The amount of light emitted compared to the amount of light entered (the century of light). In other words, strong century light has a large amount of light, and weak century light has a small amount of light. A team of researchers from the Department of Chemical Engineering/Polymer Engineering, Seo Young-deok, College of Vocal and Chemical Research, found that when elements called "Tm" are synthesized into nanoparticles with specific atomic structure, light can be reduced to weak but light can be amplified inside the material. The research team newly named the "Avalanche Nano Particle" (ANP), considering that the nanoparticles that cause these optical chain amplification reactions are similar to those of light causing avalanches. It is titled "Giant Nonlinear Optical Response from Photon-Avalanche Nanoparticles" and was selected in the cover paper of Nature£ (I.F.=42.8) dated 14 January 2021 in British time. ○ This phenomenon discovered by the research team is a nonlinear optical phenomenon in which once light is absorbed multiple times by nanoparticles, a chain of amplification of light occurs in the atomic lattice structure that makes up the nanoparticles, releasing the light of greater energy back into a strong force. Therefore, even a small laser pointer-level energy light can be pecked into a light nanoparticle and released by converting a strong century of light to a larger energy source. With the discovery of this new phenomenon, the team succeeded in observing a very small 25 nm material that is hard to see with light at high super-resolution*. * There is a limit to the resolution of materials that can be seen by light. Matter with visible light wavelengths of 400 nm to 700 nm or less is very difficult to see at high resolution, and the optical field, which allows the size of 400 nm or less to be seen as light, is called ultra-resolution nanoscopy imaging. This field is http://dongascience.donga.com/news/view/5283, which won the 2014 Nobel Prize in Chemistry, and has significant significance in modern optics. The research team presented in this paper by implementing ultra-high resolution nanoscopy imaging more simply using the local fluorescence emission effect of photovoltaic nanoparticles. ○ In a follow-up study, Professor Seo Young-deok and Professor P. James Schuck of Columbia University will co-founded the world-renowned Gordon Research Conference for the first time in the U.S. in late June this year. Professor Seo Young-deok said, "The discovery of nanoparticle luminosity" is likely to be used as a new technology in the future as it can be widely used in all industries and technologies that utilize light." ○ This study was conducted with the support of the Korea Research Foundation's Global Laboratory (GRL) support project and the Ministry of Commerce, Industry and Energy's Industrial Technology Innovation project.
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- 작성일 2021-01-24
- 조회수 5089
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- Research team of Professor Kim Han-ki of Materials Engineering Develop Technology for Transparent Perovskite Solar Cells
- Research team of Professor Kim Han-ki, Department of New Materials Engineering, Development of Core Technology for Next Generation Transparent Perovskite Solar Cells - Development of transparent cathode manufacturing technology to implement next-generation translucent perovskite solar cells - Online publication and patent application of Nano Energy, an international journal, in January 2021 A research team led by Professor Kim Han-ki of the Department of New Materials Engineering has developed a transparent cathode manufacturing technology to implement the next generation translucent perovskite solar cell. The translucent perovskite solar cell is highly efficient and is expected to be applicable to building integrated photovoltics (BIPV), the next generation of building external glass, or automotive glass. However, due to the limitations of transparent electrode casod technology, only laboratory-level research has been reported so far. Professor Kim Han-ki's research team developed a technology that can manufacture translucent perovskite solar cells without plasma damage using linear face target sputtering (LFTS) technology used in mass-production of semiconductors and displays. ※ Sputter technology: A device that produces thin films when manufacturing semiconductors/displays ※ Plasma Damage: A phenomenon in which semiconductor devices, displays, or solar cells are damaged due to exposure to plasma. Although ITO electrode technology using existing sputter technology had to increase process temperature as well as plasma damage, the research team developed a technology that can successfully produce high-efficiency translucent perovskite by applying InZnSnO and LFTS technology that show transparent electrode characteristics at room temperature. ※ ITO Electrode Technology: In order to produce a display/solar cell, transparent and electrical electrodes are required, and indium Tin Oxide (ITO) substances are generally used. ※ InZnSnO: Unstructured transparent electrode material produced by doping Zn (zinc) and Sn (comment) to In2O3 oxide semiconductors at the same time Professor Kim Han-ki said, "This study will be a key technology in producing translucent perovskite solar cells in the future, and it is meaningful that domestic researchers have secured key technologies for implementing translucent perovskite solar cells." This study was conducted with the support of KEPCO's external tasks and joint research with the Korea Electric Power Research Institute, and the findings were published online in January 2021 in the international journal Nano Energy. ※ Research Name : Semi-transparent perovskite solar cells with bidirectional transparent electrodes ※ https://doi.org/10.1016/j.nanoen.2020.105703
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- 작성일 2021-01-24
- 조회수 4491