X射线光电子能谱
纳米晶材料
硫脲
铜
硫化铜
材料科学
光谱学
透射电子显微镜
相(物质)
纳米晶
化学计量学
分析化学(期刊)
吸收光谱法
化学工程
化学
纳米技术
冶金
物理化学
有机化学
工程类
物理
色谱法
量子力学
作者
Xuchuan Jiang,Yi Xie,Jun Lu,Wei He,Liying Zhu,Yitai Qian
摘要
Nanocrystallites of non-stoichiometric copper sulfides were synthesized via the reaction between [Cu(NH3)4]2+ and thiourea in sealed autoclaves at the low temperature of 60 °C for 3 h. Thiourea played a key role in the process of Cu9S8 nanocrystal formation. Through adjusting the redox atmosphere, Cu7S4 and CuS were obtained from the freshly formed Cu9S8 nanocrystals. The products were characterized by means of X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), FT-IR spectroscopy and transmission electron microscopy (TEM) techniques. The Cu ∶ S atomic ratios for Cu9S8 and Cu7S4 were 9 ∶ 8.08 and 7 ∶ 4.05, respectively, analyzed by inductively coupled plasma (ICP) spectroscopy. The possible mechanism of phase transformation among copper sulfides (Cu9S8, CuS, and Cu7S4) was discussed. The optical properties of the products were also recorded by means of UV–vis absorption, and photoluminescence spectroscopy.
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