Fast Regeneration of CdSe Quantum Dots by Ru Dye in Sensitized TiO2 Electrodes
Fast Regeneration of CdSe Quantum Dots by Ru Dye in Sensitized TiO2 Electrodes
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DOI：
10.1021/jp100591m
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发表时间：
2010-03
影响因子：
3.7
通讯作者：
I. Mora‐Seró;V. Likodimos;S. Giménez;E. Martínez-Ferrero;J. Albero;E. Palomares;A. Kontos;P. Falaras;J. Bisquert
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文献类型：
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作者：
I. Mora‐Seró;V. Likodimos;S. Giménez;E. Martínez-Ferrero;J. Albero;E. Palomares;A. Kontos;P. Falaras;J. Bisquert
利用光致发光（PL）、拉曼和瞬态吸收（TAS）光谱研究了作为介孔TiO 2电极共敏化剂的胶体CdSe量子点（QDs）和多吡啶钌染料的相互作用以及量子点包覆和锚定方式（直接吸附和连接吸附）的影响。量子点在二氧化钛上的直接吸附导致更有效的PL猝灭相比，通过分子连接器（半胱氨酸）连接的量子点。这一事实表明，较高的电子注入前锚定模式。CdS量子点敏化的二氧化钛电极上的ZnS涂层钝化量子点的表面状态和部分释放量子限制效应，如在胶体核壳纳米粒子中观察到的。随后的共敏化与钌分子染料显着淬灭的量子点/TiO 2电极的PL，即使在存在的ZnS涂层，表明存在的强的光诱导的电荷转移之间的CdSe量子点和染料分子。这是...
Interacting properties of colloidal CdSe quantum dots (QDs) and polypyridyl ruthenium dyes employed as cosensitizers of mesoporous TiO2 electrodes as well as the effect of QDs coating and anchoring mode (direct and linker adsorption) have been investigated by photoluminesce (PL), Raman, and transient absorption (TAS) spectroscopies. Direct adsorption of QDs on TiO2 leads to a more efficient PL quenching compared to that of QDs attached by means of a molecular linker (cysteine). This fact suggests higher electron injection for the former anchoring mode. Coating of ZnS on CdSe QDs sensitized TiO2 electrodes passivates the QDs surface states and partially releases quantum confinement effects, as is observed in colloidal core−shell nanoparticles. Subsequent cosensitization with a ruthenium molecular dye dramatically quenches the PL of the QDs/TiO2 electrodes, even in the presence of ZnS coating, indicating the presence of strong photoinduced charge transfer between the CdSe QDs and the dye molecules. This is ...