Bimetallic flowers, beads, and buds: synthesis, characterization, and raman imaging of unique mesostructures

Sajanlal, P. R. ; Pradeep, T. (2010) Bimetallic flowers, beads, and buds: synthesis, characterization, and raman imaging of unique mesostructures Langmuir, 26 (1). pp. 456-465. ISSN 0743-7463

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Official URL: http://pubs.acs.org/doi/abs/10.1021/la9020542

Related URL: http://dx.doi.org/10.1021/la9020542

Abstract

We demonstrate the creation of a new class of nano/mesostructures, such as Au/Ag flowers, Au/Pt buds, and Au/Pt beads, through the directed overgrowth of Ag or Pt on Au/oligoaniline nanowires (Au/OA NWs). Different stages of the formation of these mesostructures have been studied using various spectroscopic and microscopic techniques. The surface plasmon resonance (SPR) of the Au/OA NWs can be tuned by the incorporation of bimetallicity into the nanowire. Raman based spectral imaging of the bimetallic Au/Ag mesoflower and Au/Pt mesobud revealed the molecular details and the nature of interaction of oligoaniline with the different metal domains. Raman study also suggested a substrate effect due to the different domains of the mesostructures, and spectral images distinguished these two regions. The single particle spectral images suggest that the material is surface-enhanced Raman active.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:27311
Deposited On:10 Dec 2010 12:48
Last Modified:08 Jun 2011 11:13

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