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Pulse 전위를 적용한 전기화학적 증착 공정으로 제조된 가시광 활성 이종접합 CuInS2-TiO2 Nanotube 화합물 광전극
윤정호 ( Jung Ho Yun ),( Rose Amal ),박영구 ( Young Koo Park ) 한국유화학회 2013 한국응용과학기술학회지 Vol.30 No.1
Excellent electron transport properties with enhanced light scattering ability for light harvesting have made well-ordered one dimensional TiO2 nanotube(TNT) arrays an alternative candidate over TiO2 nanoparticles in the area of solar energy conversion applications. The principal drawback of TNT arrays being activated only by UV light has been addressed by coupling the TNT with secondary materials which are visible light-triggered. As well as extending the absorption region of sunlight, the introduction of these foreign components is also found to influence the charge separation and electron lifetime of TNT. In this study, a novel method to fabricate the TNT-based composite photoelectrodes employing visible responsive CuInS2 (CIS) nanoparticles is presented. The developed method is a square wave pulse-assisted electrochemical deposition approach to wrap the inner and outer walls of a TNT array with CIS nanoparticles. Instead of coating as a dense compact layer of CIS by a conventional non-pulsed-electrochemical deposition method, the nanoparticles pack relatively loosely to form a rough surface which increases the surface area of the composite and results in a higher degree of light scattering within the tubular channels and hence a greater chance of absorption. The excellence coverage of CIS on the tubular TiO2 allows the construction of an effective heterojunction that exhibits enhanced photoelectrochemical performance.
Jo, Young Min,Jung, Suk Jo,Amal, Rose 한국공업화학회 2001 Journal of Industrial and Engineering Chemistry Vol.7 No.2
The validity of the small angle laser light scattering(SALLS) technique for analyzing the structure of aggregated particles was examined based on an evaluation of fractal dimension. Hydrolyzing metal salts were used for the coagulation and the pH was adjusted by addition of a sodium hydroxide solution. The effect of agitation was also observed and a Malvern Mastersizer was used as the light scattering instrument. It was found that the SALLS method was useful in evaluating the fractal dimension of micron-sized flocs in real time, plus the mechanical shear rate had no affect on the floc break-up or restructuring.