Structures and properties of nanoparticle thin films formed via a one- step exchange-cross-linking-precipitation route

Frank L. Leibowitz, Wenxia Zheng, Mathew M Maye, Chuan Jian Zhong

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Abstract

This paper describes the characterizations of structural and electrochemical properties of nanoparticle thin films derived by a one-step exchange-cross-linking-precipitation route. While there exists a stepwise layer-by-layer construction method, our motivation stems from seeking an alternative and simpler pathway to prepare such thin films as electrode nanomaterials. The model system consisting of thiolate-encapsulated gold nanocrystals and α,ω-alkanedithiol cross-linkers was studied. The mixing of these two components in solutions allowed sequential exchanging, cross- linking, and eventual precipitation of the dithiol-cross-linked nanocrystals as thin films on almost any substrates. A series of comparative microscopic, spectroscopic, and electrochemical analyses were performed on thin films derived from nanocrystals of 2-and 5-nm core sizes. The 5-nm particles were fabricated by size and shape evolution of preformed 2-nm particles. The films were specularly reflecting, electronically continuous, and remarkably comparable with stepwise-derived thin films in structural, electronic, and electrochemical properties. The electrochemical data were discussed in terms of thiolate binding and barrier properties of the core-shell structures, which may have potential chemical recognition applications.

Original languageEnglish (US)
Pages (from-to)5076-5083
Number of pages8
JournalAnalytical Chemistry
Volume71
Issue number22
DOIs
StatePublished - Nov 15 1999
Externally publishedYes

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ASJC Scopus subject areas

  • Analytical Chemistry

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