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Electrochemical templating of metal nanoparticles and nanowires on single-walled carbon nanotube networks
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UNSPECIFIED (2005) Electrochemical templating of metal nanoparticles and nanowires on single-walled carbon nanotube networks. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 127 (30). pp. 10639-10647. doi:10.1021/ja051320r ISSN 0002-7863.
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Official URL: http://dx.doi.org/10.1021/ja051320r
Abstract
The use of single-walled carbon nanotube (SWNT) networks as templates for the electrodeposition of metal (Ag and Pt) nanostructures is described. Pristine SWNTs, grown on insulating SiO2 surfaces using catalyzed chemical vapor deposition, served as the working electrode. In the simplest case, electrical contact was made by depositing a gold strip on the SWNT substrate (device 1). Deposition of Ag and Pt over extensive periods (30 s) resulted in a high density of particles on the SWNTs, with almost contiguous nanowire formation from the Au/SWNT boundary moving to isolated nanoparticles at further distances from the contact. For direct electrochemical studies of Ag and Pt nucleation, the assembly was coated in a resist layer and a small window opened up to expose only the electrically connected SWNTs to solution (device 2). In this case, the electrochemical signature in voltammetric and amperometric studies of metal deposition was due solely to processes at the SWNTs. Coupled with high-resolution microscopy measurements (atomic force microscopy and field emission scanning electron microscopy), this approach provided detail on the nucleation and growth mechanisms of Ag and Pt on SWNTs under electrochemical control. In particular, Ag growth was found to be rapid and progressive with an increasing nanoparticle density with time, whereas Pt deposition was characterized by lower nucleation densities and slower growth rates with a tendency for larger particles to be produced over long times.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QD Chemistry | ||||
Journal or Publication Title: | JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | ||||
Publisher: | AMER CHEMICAL SOC | ||||
ISSN: | 0002-7863 | ||||
Official Date: | 3 August 2005 | ||||
Dates: |
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Volume: | 127 | ||||
Number: | 30 | ||||
Number of Pages: | 9 | ||||
Page Range: | pp. 10639-10647 | ||||
DOI: | 10.1021/ja051320r | ||||
Publication Status: | Published |
Data sourced from Thomson Reuters' Web of Knowledge
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