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Chemistry of Materials (Study into the Synthesis and Shape Development in Colloidal CuInxGa1-xS2 Nanocrystals)

February 21, 2013 – 11:26 am – Comments Off on Chemistry of Materials (Study into the Synthesis and Shape Development in Colloidal CuInxGa1-xS2 Nanocrystals)

Systematic Study into the Synthesis and Shape Development in Colloidal CuInxGa1-xS2 Nanocrystals Claudia Coughlan, Ajay Singh, and Kevin M. Ryan
Chem. Mater., Just Accepted Manuscript • DOI: 10.1021/cm302597x • Publication Date (Web): 18 Feb 2013 Downloaded from http://pubs.acs.org on February 21, 2013

Herein, we report a systematic study on the colloidal growth of CuInxGa1-xS2 nanocrystals and nanorods. The formation of CuInxGa1-xS2 nanocrystals is shown to occur in several discrete steps, beginning with formation of the binary copper sulfide transitioning through ternary and subsequently progressing to yield the quaternary form. This allows fine tuning of the aspect ratio through incorporation of amine ligands of differing alkyl chain length giving nanorods ranging from ~7.5 to 14 nm in diameter. The complexity of this system is extensively detailed with a sequential investigation of the effect of amines, thiols, phosphonic acids, in addition to coordinating and non-coordinating solvents on growth protocols. A diverse range of shape morphologies is attained, ranging from hexagon discs to hatchet shaped crystals, with an optimal synthetic window demonstrated using thiol-amine ligands to generate regular nanorods of controlled dimensions. These nanorods can be assembled over large-scale areas with each nanorod vertically aligned and close packed, allowing for device scale properties defined by the aspect ratio of each building block.40