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디지털 패턴화된 저항형 마이크로 히터를 이용한 ZnO 나노와이어 마이크로 센서
권진형(J. Kwon),최준화(J. Choi),고승환(S.H. Ko) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
The nanowire based sensor has extremely high sensitivity due to the high specific surface area. In this study, we utilized the resistive micro heater for localized and selective growth of the metal oxide nanowire. The micro heater is fabricated by selective laser sintering of silver nanoparticle which is a maskless and non-vacuum process. By selective Joule heating of the digitally patterned resistive micro heater, seeding spots of the ZnO hydrothermal synthesis is specified. This technique is applied to the ZnO nanowire based UV sensor.
Photo-thermal-chemical Reaction Process of Tungsten Oxide for Electrochromic Application
H. Cho(조현민),J. Kwon(권진형),W. S. Lee(이원섭),W. S. Chang(장원석),S. H. Ko(고승환) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
A Direct laser write (DLW) process has broadened a novel patterning method for advanced electronic device fabrication. The DLW process bases on the photo-thermal-chemical reaction and features such as high precision, fast processing, and room temperature processability without inert gas. Before, the process scalability of the interaction between the nanomaterials and laser has been examined on the various conductive metal nanomaterials such as gold, silver, and copper. Although the direct laser writing process has shown many achievements on the metal nanomaterials, it has rarely been researched for the laser-material interaction of the metal oxide nanomaterials. In this study, WOx metal oxide material employs the DLW process for post-processing which enables patterning and annealing simultaneously with inducing photo-chemical redox reaction as well as photo-thermal effect. The DLW-processed WO₃ thin film has shown similar electrochemical performances for the electrochromic application to the thermal annealed WO₃ thin film. We have demonstrated a facile and fast fabrication of the electrochromic device (ECD) with the DLW-processed WO₃ thin film layer.