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Long Distance Electron Transfer Across \u3e100 nm Thick Au Nanoparticle/Polyion Films to a Surface Redox Protein

机译:电子跨100 nm厚金纳米颗粒/聚酰亚胺薄膜到表面氧化还原蛋白的长距离转移

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摘要

Glutathione-decorated 5 nm gold nanoparticles (AuNPs) and oppositely charged poly(allylamine hydrochloride) (PAH) were assembled into {PAH/AuNP}n 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 \u3e100 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.
机译:将谷胱甘肽修饰的5 nm金纳米颗粒(AuNPs)和带相反电荷的聚烯丙胺盐酸盐(PAH)组装到在热解石墨(PG)电极上逐层(LbL)制备的{PAH / AuNP} n薄膜中。这些AuNP /聚离子薄膜首次利用AuNPs作为电子跳跃中继,实现了下层电极与外膜表面氧化还原蛋白之间的直接电子转移,跨越了前所未有的距离。随着膜厚度的增加,这些膜上的表面肌红蛋白(Mb)的伏安峰电流降低,但电子传输速率相对恒定,这与AuNP介导的电子跳跃机制一致。

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