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제109회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Synthesis of CdSe-ZnO and au-ZnO Composite by a Galvanic Replacement Reaction followed by Photoinduced Cathodic Deposition

2012년 2월 23일 09시 46분 07초
ELEC.P-1295 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
4월 25일 (수요일) 18:00~21:00
저자 및
최승언, 이우주, 명노승
건국대학교 응용화학과, Korea
ZnO/CdSe composite was prepared via a combination of three techniques including electrodeposition, galvanic replacement and photoinduced cathodic deposition. ZnO nanowire arrays were electrodeposited on ITO or polycrystalline Au electrode and metallic zinc co-deposited with ZnO was galvanically replaced with Se in Se4+ containing aqueous solution, which resulted in ZnO/Se composite nanowire arrays. Then, Se in ZnO/Se composite was photoelectrochemically reduced to Se2- when light was illuminated on the ZnO/Se composite, which reacted with Cd2+ in the electrolytes to produce ZnO/CdSe composite. The amount of metallic zinc increased with decrease of deposition potential, which was investigated with combined electrochemical quartz crystal microgravimetry with linear sweep voltammetry. The shape of electrodeposited ZnO nanowire arrays were maintained after galvanic replacement or light illumination, therefore ZnO/Se or ZnO/CdSe had the shape of nanowire arrays. ZnO, ZnO/Se, ZnO/CdSe were characterized by SEM, EDX and XRD. Photoelectrochemical experiments revealed that electrodeposited ZnO nanowire arrays showed n-type semiconductor, which changed to p-type after deposition of Se. ZnO/CdSe composite showed anodic photocurrent upon light illumination which indicated n-type character. This study provides a facile method for the synthesis of CdSe sensitized ZnO composite photoelectrodes. Synthesis of Au-ZnO Composite is same reaction. First, Zn/ZnO electrode is deposited on the ITO electrode by electrodeposition. And then, Zn/ZnO electrode is soaked in solution included Au3+ ion . in that case Zn is substituted to Au by Galvanic Displacement Reaction. Created electrode is confirmed XRD, SEM, EDX, UV-VIS spectrometer.