Colloidal synthesis of CuGaSxSe2-x nanoribbons mediated by Cu1.75(SSe) nanocrystals as catalysts

Fast ionic conductor acting as catalyst offers an efficient choice to produce one-dimensional nanomaterial with high crystallinity and flexible tolerance for lattice mismatch. We report the colloidal synthesis of CuGaSxSe2-x nanoribbons with the assistance of Cu-1.75(SSe) nanocrystals for their intrinsic nature of fast ionic conductors. The structure of the as-prepared CuGaSxSe2-x nanoribbons is hexagonal wurtzite with (001) lattice planes exposed. The composition of nanoribbons can be tuned within the broad range by changing the relative concentration of Se/OA in stock solution. By monitoring the structures, compositions, and morphologies of the nanoribbons, it is confirmed that Cu-1.75(SSe) nanocrystals are formed firstly, originating from the thermal decomposition of copper diethyldithiocarbamate precursors in the presence of dodecanethiol and selenium-oleylamine, and then act as the catalysts for the growth of the nanoribbons. (C) 2014 Elsevier B.V. All rights reserved.