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 |
显示于类别: | Articles |