期刊
TRAC-TRENDS IN ANALYTICAL CHEMISTRY
卷 27, 期 7, 页码 604-611出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.trac.2008.03.012
关键词
analyte detection; biosensor; carbon nanotube; electrochemical impedance spectroscopy; electrochemical sensor; gold nanoparticle; immunosensor; impedance; nanoparticle; nanomaterial
This article presents an overview of electrochemical sensors that employ nanomaterials and utilize electrochemical impedance spectroscopy for analyte detection. The most widely utilized nanomaterials in impedance sensors are gold (Au) nanoparticles and carbon nanotubes (CNTs). Au nanoparticles have been employed in impedance sensors to form electrodes from nanoparticle ensembles and to amplify impedance signals by forming nanoparticle-biomolecule conjugates in the solution phase. CNTs have been employed for impedance sensors within composite electrodes and as nanoelectrode arrays. The advantages of nanomaterials in impedance sensors include increased sensor surface area, electrical conductivity and connectivity, chemical accessibility and electrocatalysis. (C) 2008 Elsevier Ltd. All rights reserved.
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