标题: Aggregation of zinc protoporphyrin in anodized aluminum oxide (AAO) nanoporous environments
作者: Lin, JS
Chen, YC
Chen, CC
Diau, EWG
Liu, TF
材料科学与工程学系
应用化学系分子科学硕博班
Department of Materials Science and Engineering
Institute of Molecular science
关键字: AAO;aggregation;excitonic coupling;porphyrin;solar energy conversion
公开日期: 1-二月-2006
摘要: The aggregation behavior of zinc protoporphyrin (ZnPP) inside nanoporous environments of anodized aluminum oxide (AAO) has been investigated through observation of the variation of UV/visible absorption and emission spectra of the system. The Soret band in the absorption spectrum of ZnPP/AAO thin-film samples becomes much broader than that observed for ZnPP/THF solutions, and the relative intensity of the Q band is distinctly enhanced for the former. The broad Soret band overlaps the enhanced Q band increasingly as the degree of aggregation increases with increasing duration of immersion, with initial concentration of ZnPP/THF solutions, or with decreasing pore size of AAO nanotubes. A strong excitonic coupling between the Soret and Q transition dipoles causes the absorption spectrum of the ZnPP/AAO system to cover the entire visible spectral region. Emission spectra of ZnPP/AAO samples in the steady state contain multiple resolvable components assigned to monomer, dimer and higher aggregates. The observed systematic variation of emission spectra of ZnPP/AAO samples is consistent with the observation in absorption spectra of the system and reflects the significance of aggregation of ZnPP in a specific nanoporous environment.
URI: http://hdl.handle.net/11536/12687
ISSN: 0009-4536
期刊: JOURNAL OF THE CHINESE CHEMICAL SOCIETY
Volume: 53
Issue: 1
起始页: 201
结束页: 208
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