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Title: Unusual selectivity of metal deposition on tapered semiconductor nanostructures
Authors: Mishra, N.
Lian, J.
Chakrabortty, S.
Lin, M.
Chan, Y. 
Keywords: gold
Ostwald ripening
Issue Date: 12-Jun-2012
Citation: Mishra, N., Lian, J., Chakrabortty, S., Lin, M., Chan, Y. (2012-06-12). Unusual selectivity of metal deposition on tapered semiconductor nanostructures. Chemistry of Materials 24 (11) : 2040-2046. ScholarBank@NUS Repository.
Abstract: We describe a surfactant-driven method to synthesize highly monodisperse CdSe-seeded CdS nanoheterostructures with conelike, tapered geometries in order to examine the effects of shape on the location-specific deposition of Au under ambient conditions. Although preferential metal deposition at surface defect sites are generally expected, we found suprisingly that Au growth at the side facets of tapered linear and branched structures was significantly suppressed. Further investigation revealed this to be due to a highly efficient electrochemical Ostwald ripening process which was previously thought not to occur in branched nanostructures such as tetrapods. We exploited this phenomenon to fabricate uniform asymmetrically tipped CdSe-seeded CdS tetrapods with conelike arms, where a solitary large Au tip is found on one of the arms while the other three arms bear Ag 2S tips. Importantly, this work presents a synthetic route toward the selective deposition of metals onto branched semiconductor nanostructures whose arms have nearly symmetric reactivity. © 2012 American Chemical Society.
Source Title: Chemistry of Materials
ISSN: 08974756
DOI: 10.1021/cm300161m
Appears in Collections:Staff Publications

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