Sequence-Dependent Photocurrent Generation through Long-Distance Excess-Electron Transfer in DNA

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• 作者：Dr. Shih-Hsun Lin ; Prof. Dr. Mamoru Fujitsuka and Prof. Dr. Tetsuro Majima
• 刊名：Angewandte Chemie
• 出版年：2016
• 出版时间：July 18, 2016
• 年：2016
• 卷：128
• 期：30
• 页码：8857-8859
• 全文大小：791K
• ISSN：1521-3757

文摘

Given its well-ordered continuous π stacking of nucleobases, DNA has been considered as a biomaterial for charge transfer in biosensors. For cathodic photocurrent generation resulting from hole transfer in DNA, sensitivity to DNA structure and base-pair stacking has been confirmed. However, such information has not been provided for anodic photocurrent generation resulting from excess-electron transfer in DNA. In the present study, we measured the anodic photocurrent of a DNA-modified Au electrode. Our results demonstrate long-distance excess-electron transfer in DNA, which is dominated by a hopping mechanism, and the photocurrent generation is sequence dependent.