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  • 03월 05일 13시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

대한화학회 제105회 학술발표회 및 총회 TiO2 photocatalysts modified with uniform gold nanoparticles

등록일
2010년 2월 12일 11시 53분 13초
접수번호
0137
발표코드
39P182포 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
금 <발표Ⅳ>
발표형식
포스터
발표분야
재료화학
저자 및
공동저자
이명순, 이동일
연세대학교 화학과, Korea
The deposition of noble metal nanoparticles on semiconductor surface can increase the efficiency of photocatalytic reaction due to their role as a reservoir for photogenerated electrons. Although they can promote charge carrier separation and interfacial charge-transfer processes in noble metal nanoparticles/semiconductor composite system, there is still unsettled problem concerning the control of size, shape and electron transfer of noble metal deposits. In this presentation, we have investigated a new strategy to prepare well-defined nanoparticle photocatalysts using monolayer-protected gold clusters (MPCs). TiO2 modified with uniform Au MPCs via a bifuntional linker, glutathione, exhibited high photostability and enhanced photocatalytic activity for the photoreductive degradation of a model dye, Uniblue A (UBA), under UV illumination. While there is little enhancement in photocatalytic activity found for TiO2 modified with Au MPCs, the activity significantly increases upon thermal activation of AuMPC-TiO2 assemblies. TEM images showed that the Au MPCs core size was maintained after anchoring to TiO2 and thermal activation of the AuMPCs-TiO2 assembles. In addition, the effects of the linker between TiO2 and the gold core on the charge separation and photocatalytic activity will be discussed.

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