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摘要
Single-phase, well-dispersed, plate-shaped cubic Cu2-xSe nanocrystals were synthesized through an ambient-pressure solution chemical process using green triethylene glycol (TEG) as solvent, copper(II) chloride and selenium powder as precursors, hydrazine hydrate as reducing agent and polyvinylpyrrolidone as dispersing agent. The basic structural characteristics of the as-synthesized Cu2-xSe nanoplates are described. The influence of temperature, reaction time and the amount of added polyvinylpyrrolidone on the synthesis product were investigated by X-ray diffraction, high-resolution transmission electron microscopy, energy dispersive X-ray spectroscopy and UV-vis-NIR measurments. The results showed that the resulting cubic Cu2-xSe phase was thermodynamically stable when the initial Cu:Se atomic ratio in the reaction solution was 2:1. The high injection temperature was suitable for the formation of single-phase Cu2-xSe nanoplates with relatively uniform sizes. The strong capping effect of polyvinylpyrrolidone with multi-acyl side group molecule structure effectively controlled the morphological evolution and dispersibility features of the plate-shaped nanocrystals in our TEG-based solution synthesis.
- 出版日期2013-6
- 单位天津大学
