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리쥔찬,전주원,장이운,Min-Kyu Kim,Eun Yee Ko,이주인,이인환 대한금속·재료학회 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.2
We examined the excitation wavelength dependence of photoluminescence (PL) property in CdSe/CdZnS colloidal quantum dots (QDs) on micro-patterned silver (Ag) films (MPSFs). PL quenching of the fluorophore was observed when the excitation wavelength was out of the absorption range of MPSF substrates. In contrast, when the excitation wavelength was within the absorption spectrum range, the PL intensity on Ag films was markedly enhanced by a factor of two. It was expected that the principal causes on the PL properties of the fluorophore on Ag films would be the energy match between the incident light and the surface plasmon of Ag metal films.
리쥔찬,Sudarsan Raj,윤진현,유연태,이주인,이인환 대한금속·재료학회 2016 ELECTRONIC MATERIALS LETTERS Vol.12 No.6
We have successfully synthesized high crystalline quality ZnOnanosheets (NSs) structures by a hydrothermal process. The detailedcharacterizations have shown that the ZnO nanostructures were wellcrystalline, uniform and had nanosheets-like morphology with anaverage size of 100-150 nm. The photocatalytic performance of ZnONSs was examined for use in the degradation of rhodamine B dye,and exhibited ~83.7% and 96.8% dye decomposition within 100 minand 140 min, respectively, under UV irradiation. The results wereattributed to the high crystalline quality of ZnO NSs that producedreactive sites over the ZnO catalyst surface to decompose therhodamine B dye.
Gas sensing properties of single crystalline ZnO nanowires grown by thermal evaporation technique
Prabhakar Rai,리쥔찬,Rafiq Ahmad,한윤봉,이인환,유연태 한국물리학회 2013 Current Applied Physics Vol.13 No.8
The ZnO NWs were applied as effective material for the fabrication of ethanol (C2H5OH) and carbon monoxide (CO) gas sensor. The ZnO NWs were grown by thermal evaporation techniques on non-catalytic Si (100) substrates. The average width and length of ZnO NWswas 60 nmand 20 mm, respectively and they were single crystalline in nature. The maximumresponsewas 51.64 at 300 ℃ for 1000 ppm of CO gas, while 104.23 at 400 ℃ for 250 ppm of ethanol gas. The response of ZnO NWswas very high for ethanol compared to the CO, whereas the recovery time for ethanol was very poor compare to CO gas. The response of ZnO NWs was about 25 times higher for ethanol compare to CO, at 400 ℃ for 100 ppm of each gas. The high response for ethanol is related to electron donating effect of ethanol (10e-) which was higher than the CO gas (2e-). The high response of ZnO NWs was attributed to large contacting surface area for electrons,oxygen, target gas molecule, and abundant channels for gas diffusion.