Size controlled gold tip growth onto II–VI nanorods

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Title: Size controlled gold tip growth onto II–VI nanorods
Authors: O'Sullivan, Catriona
Gunning, Robert Denis
Barrett, Christopher A.
Singh, Ajay
Ryan, Kevin M.
Permanent link: http://hdl.handle.net/10197/2830
Date: 28-Sep-2010
Abstract: Gold tip size and multiplicity is controlled in hybrid gold-semiconductor nanorods (CdS-Au, CdSe-Au and CdTe-Au) in fast reaction times of less than 2 minutes by optimising precursor type, concentration, and temperature. Controllable gold tips up to as large as 40 nm on a rod diameter of 7 nm are reported with the tip size shown to be directly related to the redox potentials of the dangling atoms on the nanorod and the gold chloride precursors (mono or trivalent). The preference for symmetric (both ends) over asymmetric (single end) is achieved by simply elevating the reaction temperature to 80ºC without changing the reaction time. TEM and XRD analysis were preformed to verify both the gold nanoparticle size and crystallinity of the hybrid nanostructures. Increased quenching of nanorod emission is observed as the size of the gold tip increases suggesting optimisation of charge transfer between the semiconductor and the metal.
Funding Details: Science Foundation Ireland
Irish Research Council for Science, Engineering and Technology
Other funder
Type of material: Journal Article
Publisher: RSC publications
Copyright (published version): 2010 The Royal Society of Chemistry
Keywords: Gold-semiconductor nanorods;Nanoparticle size;Crystallinity
Subject LCSH: Semiconductors
Nanoparticles
Crystallization
DOI: 10.1039/C0JM01689F
Language: en
Status of Item: Peer reviewed
Appears in Collections:Solar Energy Conversion (SEC) Cluster Research Collection

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