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Electrochemical impedance spectroscopy of single Au nanorods

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Abstract

We propose monochromatic dark-field imaging microscopy (DFM) to measure the non-faradaic electrochemical impedance spectroscopy (EIS) of single Au nanorods (AuNRs). DFM was utilized to monitor the plasmonic scattering of monochromatic incident light by surface-immobilized individual AuNRs. When modulating the surface potential at a certain frequency, non-faradaic charging and discharging of AuNRs altered their electron density, leading to periodical fluctuations in the scattering intensity. Analysis of the amplitude and phase of the optical intensity fluctuation as a function of modulation frequency resulted in the EIS of single AuNRs. High-frequency (>100 Hz) modulation allowed us to differentiate the intrinsic charging effect from other contributions such as the periodic migration and accumulation of counterions in the surrounding medium, because the latter occurred at a longer timescale. As a result, single nanoparticle EIS led to the surface capacitance of single AuNRs being closer to the theoretical value. Since interfacial capacitance has been proven sensitive to molecular interactions, the present work also offers a new platform for single nanoparticle sensing by measuring the single nanoparticle capacitance.

Graphical abstract: Electrochemical impedance spectroscopy of single Au nanorods

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Publication details

The article was received on 01 Mar 2018, accepted on 02 Apr 2018 and first published on 02 Apr 2018


Article type: Edge Article
DOI: 10.1039/C8SC00983J
Citation: Chem. Sci., 2018, Advance Article
  • Open access: Creative Commons BY-NC license
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    Electrochemical impedance spectroscopy of single Au nanorods

    T. Liu, M. Li, Y. Wang, Y. Fang and W. Wang, Chem. Sci., 2018, Advance Article , DOI: 10.1039/C8SC00983J

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