Plasmonic-based electrochemical impedance spectroscopy: application to molecular binding.

Plasmonic-based electrochemical impedance spectroscopy: application to molecular binding.
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DOI:
10.1021/ac202634h
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发表时间:
2012-01-03
影响因子:
7.4
通讯作者:
Tao, Nongjian
Tao, Nongjian
中科院分区:
化学1区
文献类型:
--
作者:
Lu, Jin;Wang, Wei;Wang, Shaopeng;Shan, Xiaonan;Li, Jinghong;Tao, Nongjian

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发展了基于等离子体的电化学阻抗谱(P-EIS)来研究分子在表面的结合。其基本原理依赖于表面等离子体共振(SPR)信号对表面电荷密度的敏感依赖性,表面电荷密度是通过在SPR芯片表面施加交流电势来调制的。SPR响应的交流分量提供电化学阻抗,直流分量提供常规的SPR检测。在一定频率范围内测量的等离子体基阻抗与常规的电化学阻抗是定量一致的。与传统的SPR检测相比,P-EIS对芯片表面发生的分子结合反应敏感,对体折射率变化或非特异性结合反应不敏感。此外,这种新的方法允许同时进行表面等离子体共振和分子结合过程的表面阻抗分析。
Plasmonic-based electrochemical impedance spectroscopy (P-EIS) is developed to investigate molecular binding on surfaces. Its basic principle relies on the sensitive dependence of surface plasmon resonance (SPR) signal on surface charge density, which is modulated by applying an AC potential to a SPR chip surface. The AC component of the SPR response gives the electrochemical impedance, and the DC component provides the conventional SPR detection. The plasmonic-based impedance measured over a range of frequency is in quantitative agreement with the conventional electrochemical impedance. Compared to the conventional SPR detection, P-EIS is sensitive to molecular binding taking place on the chip surface, and less sensitive to bulk refractive index changes or non-specific binding. Moreover, this new approach allows for simultaneous SPR and surface impedance analysis of molecular binding processes.
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