Ultrasound-Aided Formation of Gold Nanoparticles on Multi-Walled Carbon Nanotubes Functionalized with Mercaptobenzene Moieties

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A hybrid of multi-walled carbon nanotube (MWCNT) and gold nanoparticle (Au NP) was prepared under ultrasound irradiation. The approach starts with the functionalization of the walls of MWCNTs with mercaptobenzene moieties for the subsequent immobilization of Au NPs. From the Raman spectra, mercaptobenzene was proven to exist on the MWCNTs. Gold ions were added to the aqueous dispersion of functionalized MWCNTs (f-MWCNTs), and were reduced with the aid of ultrasound and ammonium hydroxide. The reduced gold nanoparticles were examined from the TEM images. Au NPs adhered specifically on the thiol groups of mercaptobenzene to be deposited uniformly on the outer walls of the f-MWCNTs. The application of ultrasound led to a high yield of MWCNT-Au nanocomposites and to the dense distribution of the Au NPs. Moreover, the synthesis reaction rate of the hybrid was considerably enhanced relative to synthesis with mechanical agitation. Through an adsorption test using gold-binding-peptide-(GBP)-modified biomolecules, the hybrid's potential for biological diagnosis was verified.
Publisher
AMER SCIENTIFIC PUBLISHERS
Issue Date
2011-07
Language
English
Article Type
Article
Keywords

SELECTIVE ATTACHMENT; METAL NANOPARTICLES; ELECTRODES; ELECTROCHEMISTRY; DEPOSITION

Citation

JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, v.11, no.7, pp.6222 - 6226

ISSN
1533-4880
URI
http://hdl.handle.net/10203/101358
Appears in Collection
CBE-Journal Papers(저널논문)
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