Control of electron transfer from lead-salt nanocrystals to TiO₂.
Control of electron transfer from lead-salt nanocrystals to TiO₂.
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DOI：
10.1021/nl200718w
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发表时间：
2011-04
期刊：
影响因子：
10.8
通讯作者：
Byung-Ryool Hyun;A. Bartnik;Liangfeng Sun;T. Hanrath;F. Wise
中科院分区：
文献类型：
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作者：
Byung-Ryool Hyun;A. Bartnik;Liangfeng Sun;T. Hanrath;F. Wise
研究了溶剂重组能和电子耦合强度对PbS纳米晶光激发电子向TiO（2）纳米粒子转移的影响。我们发现，电子转移仅弱依赖于溶剂，在纳米晶体分子系统中的强依赖性。这是由于在这个系统中的受体的尺寸较大，并占马库斯理论。PbS和TiO（2）的电子耦合通过改变连接分子的长度、脂肪族和芳香族结构以及锚基团而改变。较短的接头分子始终导致更快的电子转移。令人惊讶的是，相同长度但不同化学结构的连接分子产生相似的电子转移速率。相反，电子转移速率可以随着不同的锚基团而显著变化。
The roles of solvent reorganization energy and electronic coupling strength on the transfer of photoexcited electrons from PbS nanocrystals to TiO(2) nanoparticles are investigated. We find that the electron transfer depends only weakly on the solvent, in contrast to the strong dependence in the nanocrystal-molecule system. This is ascribed to the larger size of the acceptor in this system, and is accounted for by Marcus theory. The electronic coupling of the PbS and TiO(2) is varied by changing the length, aliphatic and aromatic structure, and anchor groups of the linker molecules. Shorter linker molecules consistently lead to faster electron transfer. Surprisingly, linker molecules of the same length but distinct chemical structures yield similar electron transfer rates. In contrast, the electron transfer rate can vary dramatically with different anchor groups.