| Au disk nanoelectrode by electrochemical deposition in a nanopore. | |
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MedLine Citation:
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PMID: 20608658 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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In this technical note, we report a process in scaling down the fabrication of Au disk nanoelectrodes as small as approximately 4 nm in radii. We have developed a bottom-up approach toward the fabrication of individual disk-shape Au nanoelectrodes. This new approach is based upon electrochemical deposition of Au in a silica nanopore electrode and involves the following four steps. First, a laser-assisted pulling process is employed to fabricate a disk-shape Pt nanoelectrode. Second, a Pt nanopore electrode is obtained by electrochemically etching the Pt from the disk nanoelectrode. Third, a Au metal nanowire is electrochemically deposited using the Pt nanopore electrode as a template. In the last step, the Au electrode is slightly polished to expose a disk-shape Au nanoelectrode, whose size is determined by the size of the initial Pt nanoelectrode. Steady-state voltammetry in the presence of ferrocene has been used to characterize these Au nanoelectrodes. The Au nanoelectrodes are also characterized using cyclic voltammetry in a H2SO4 solution. The results show characteristic peaks corresponding to the formation of Au surface oxides and their subsequent reduction. The Au nanoelectrodes are modified with 6-(ferrocenyl)hexanethiol molecules, and cyclic voltammetry is used to characterize the ferrocene molecules attached at the Au. As an application, we have constructed Au single-nanoparticle electrodes (SNPEs) using the Au disk nanoelectrodes fabricated by electrochemical deposition. Our initial results of such SNPEs show excellent electrochemical response from single Au nanoparticles. |
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Authors:
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Bikash Kumar Jena; Stephen J Percival; Bo Zhang |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Analytical chemistry Volume: 82 ISSN: 1520-6882 ISO Abbreviation: Anal. Chem. Publication Date: 2010 Aug |
Date Detail:
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Created Date: 2010-08-10 Completed Date: 2010-12-01 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0370536 Medline TA: Anal Chem Country: United States |
Other Details:
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Languages: eng Pagination: 6737-43 Citation Subset: - |
Affiliation:
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Department of Chemistry, University of Washington, Seattle, Washington 98195-1700, USA. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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