Media type: Text; E-Article Title: Colloidal Cu 2-x(S ySe 1-y) alloy nanocrystals with controllable crystal phase: Synthesis, plasmonic properties, cation exchange and electrochemical lithiation Contributor: Dilena, Enrico [Author]; Dorfs, Dirk [Author]; George, Chandramohan [Author]; Miszta, Karol [Author]; Povia, Mauro [Author]; Genovese, Alessandro [Author]; Casu, Alberto [Author]; Prato, Mirko [Author]; Manna, Liberato [Author] imprint: Cambridge : Royal Society of Chemistry, 2012 Published in: Journal of Materials Chemistry 22 (2012), Nr. 26 Issue: published Version Language: English DOI: https://doi.org/10.15488/2161; https://doi.org/10.1039/c2jm30788j ISSN: 0959-9428 Keywords: Nanocrystalline alloys ; Near Infrared ; Phase change memory ; Synthetic routes ; Anode material ; Li-ion batteries ; Synthesis (chemical) ; Cation exchanges ; Lithiation ; Positive ions ; Crystal phase ; Hexagonal phase ; Nanocrystals ; Plasmonic properties ; Plasmon resonances ; Stoichiometry ; Cadmium alloys ; Electrochemical lithiation ; Cadmium compounds ; Hexagonal nanocrystals ; Anodes ; Spectral position Origination: Footnote: Diese Datenquelle enthält auch Bestandsnachweise, die nicht zu einem Volltext führen. Description: We report synthetic routes to both cubic and hexagonal phase Cu 2-x(S ySe 1-y) alloy nanocrystals exhibiting a well-defined near-infrared valence band plasmon resonance, the spectral position of which is dependent mainly on x, i.e. on Cu stoichiometry, and to a lesser extent on the crystal phase of the NCs. For cubic Cu 2-x(S ySe 1-y) nanocrystals y could be varied in the 0.4-0.6 range, while for hexagonal nanocrystals y could be varied in the 0.3-0.7 range. Furthermore, the Cu 2-x(S ySe 1-y) nanocrystals could be transformed into the corresponding Cd-based alloy nanocrystals with comparable S ySe 1-y stoichiometry, by cation exchange. The crystal phase of the resulting Cd(S ySe 1-y) nanocrystals was either cubic or hexagonal, depending on the phase of the starting nanocrystals. One sample of cubic Cu 2-x(S ySe 1-y) nanocrystals, with S 0.5Se 0.5 chalcogenide stoichiometry, was then evaluated as the anode material in Li-ion batteries. The nanocrystals were capable of undergoing lithiation/delithiation via a displacement/conversion reaction (Cu to Li and vice versa) in a partially reversible manner. © 2012 The Royal Society of Chemistry. Access State: Open Access