Electron transfer during binding processes between thiolate molecules and Au nano-islands

Electron transfer during binding processes between thiolate molecules and Au nano-islands
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硫醇盐分子与金纳米岛结合过程中的电子转移

DOI:
10.1016/j.apsusc.2018.12.138
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发表时间:
2019-04
影响因子:
6.7
通讯作者:
Hayashi Kenshi
Hayashi Kenshi
中科院分区:
材料科学1区
文献类型:
--
作者:
Chen Bin;Liu Chuanjun;Shang Liang;Huang Ying;Yang Shaohua;Sun Xiaoyan;Feng Changhao;Hayashi Kenshi

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我们通过用支撑溅射金纳米岛的叉指微电极(IME@AuNI)观察隧道电流,研究了硫醇盐分子和金纳米岛之间的时间依赖性结合过程中的电子转移。检查了五种硫醇盐在结合过程中随时间变化的光学和电信号变化。随着浸泡时间的延长,光吸光度增加,而通过 IME@AuNI 的电流减少。重要的是,光谱和电流特性取决于硫醇盐结构,因为覆盖层是根据硫醇盐结构形成的。这些结果主要归因于电子从金纳米岛转移到硫醇盐分子的协同效应以及硫醇盐分子在金纳米岛之间的桥联效应。
We investigated electron transfer during the time-dependent binding processes between thiolate molecules and Au nano-islands by observing tunneling current with an interdigitated microelectrode supporting the sputtered Au nano-islands (IME@AuNI). The time-dependent optical and electrical signal variation during the binding process was examined for five kinds of thiolates. As the immersion time was prolonged, the optical absorbance increased, whereas the current passing through the IME@AuNI decreased. Importantly, the spectral and current characteristics depended on the thiolate structure, because of the formation of capping layer in accordance with thiolate structure. These results are mainly attributed to synergistic effects of electron transfer from Au nano-islands to thiolate molecules and bridging effects of thiolate molecules among Au nano-islands.
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