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Colloidal Cu 2-x(S ySe 1-y) alloy nanocrystals with controllable crystal phase: Synthesis, plasmonic properties, cation exchange and electrochemical lithiation

机译:具有可控晶相的胶体Cu 2-x(S ySe 1-y)纳米晶体:合成,等离子体性能,阳离子交换和电化学锂化

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摘要

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.
机译:我们报告立方和六方相的Cu 2-x(S ySe 1-y)合金纳米晶体的合成路线展示出明确的近红外价带等离子体激元共振,其光谱位置主要取决于x,即Cu化学计量,在较小程度上涉及NC的结晶相。对于立方Cu 2-x(S ySe 1-y)纳米晶体,y可以在0.4-0.6范围内变化,而对于六方纳米晶体,y可以在0.3-0.7范围内变化。此外,可以通过阳离子交换将Cu 2-x(S ySe 1-y)纳米晶体转变为具有可比的S ySe 1-y化学计量的相应的Cd基合金纳米晶体。取决于起始纳米晶体的相,所得的Cd(S ySe 1-y)纳米晶体的晶相为立方或六方晶。然后评估了一个具有S 0.5Se 0.5硫属元素化学计量的立方Cu 2-x(S ySe 1-y)纳米晶体样品,作为锂离子电池的负极材料。纳米晶体能够通过位移/转化反应(Cu到Li,反之亦然)以部分可逆的方式经历锂化/去锂化。 ©2012皇家化学学会。

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