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  • 02월 28일 19시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제111회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Excited-State Dynamics of Carotenoids and Dye Molecules Attached to TiO2 Nanoparticles

2013년 2월 14일 16시 36분 23초
PHYS.P-452 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
4월 17일 (수요일) 16:00~19:00
저자 및
박태리, 이인구, 방윤수*
광주과학기술원(GIST) 물리화학부, Korea
TiO2 nanoparticles which have a high density of state are eager to trap electrons and carotenoids which are susceptible to oxidation can inject electrons into TiO2 nanoparticles. Thus, carotenoids and TiO2 nanoparticles can be an ideal model system for electron transfer. It is known that polar carotenoid, all-trans-8’-apo-β-caroten-8’-oic acid injects electrons from its S2 state into the conduction band of TiO2 nanoparticle and the electrons recombine with longer time scales into the carotenoid. The photoinduced electron injection and recombination dynamics between all-trans-8’-apo-β-caroten-8’-oic acid and TiO2 nanoparticles will be shown by transient absorption measurements in ultrafast time scales by exciting the S2 state of the carotenoid. Organic and inorganic dyes which have functional groups such as hydroxyl and carboxyl group, Coumarin 343, [Ru(bpy)3]2+, alizarin, (NH4)2[Ti(cat)3]?2H2O, and catechol can also be utilized in the electron transfer study with TiO2 nanoparticles. We will investigate the excited state dynamics of these dyes and electron transfer to TiO2 by femtosecond transient absorption measurements. All-trans-8’-apo-β-caroten-8’-oic acid has been synthesized from oxidation of 8’-apo-β-carotenal with Ag2O for an efficient attachment to the TiO2 surface. TiO2 nanoparticle has been synthesized from TiCl4 in a colloidal solution. All-trans-8’-apo-β-caroten-8’-oic acid will then be added to the TiO2 colloidal solution.