跨越超过100纳米厚的金纳米颗粒/聚离子膜至表面氧化还原蛋白的长距离电子转移。
Long Distance Electron Transfer Across >100 nm Thick Au Nanoparticle/Polyion Films to a Surface Redox Protein.
作者信息
Chai Hongmei, Liu Hongyun, Guo Xihong, Zheng Dong, Kutes Yasemin, Huey Bryan D, Rusling James F, Hu Naifei
机构信息
Department of Chemistry, Beijing Normal University, Beijing 100875, P. R. China.
出版信息
Electroanalysis. 2012 May 1;24(5):1129-1140. doi: 10.1002/elan.201200079.
Abstract
Glutathione-decorated 5 nm gold nanoparticles (AuNPs) and oppositely charged poly(allylamine hydrochloride) (PAH) were assembled into {PAH/AuNP} films fabricated layer-by-layer (LbL) on pyrolytic graphite (PG) electrodes. These AuNP/polyion films utilized the AuNPs as electron hopping relays to achieve direct electron transfer between underlying electrodes and redox proteins on the outer film surface across unprecedented distances >100 nm for the first time. As film thickness increased, voltammetric peak currents for surface myoglobin (Mb) on these films decreased but the electron transfer rate was relatively constant, consistent with a AuNP-mediated electron hopping mechanism.
摘要
谷胱甘肽修饰的5纳米金纳米颗粒（AuNP）与带相反电荷的聚烯丙胺盐酸盐（PAH）被逐层组装成{PAH/AuNP}膜，该膜制备于热解石墨（PG）电极上。这些AuNP/聚离子膜利用AuNP作为电子跳跃中继器，首次实现了在底层电极与外膜表面的氧化还原蛋白之间跨越超过100纳米的前所未有的距离进行直接电子转移。随着膜厚度增加，这些膜上表面肌红蛋白（Mb）的伏安峰电流降低，但电子转移速率相对恒定，这与AuNP介导的电子跳跃机制一致。
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