Formation of various crystalline phases in synthesizing of [Cu(1−x)Ag(x)]2S nanostructure: Study of structural and optical properties

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• 作者：R. Lotfi Orimi ; ^{r.lotfiorimi@gu.ac.ir} ; ^{lotfiorimi@yahoo.com} ; L. Bahlakeh
• 关键词：[Cu(1&minus ; x)Ag(x)]2S nanoprticles ; Crystalline phase ; Annealing ; Band gap
• 刊名：Optik - International Journal for Light and Electron Optics
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：130
• 期：Complete
• 页码：1254-1258
• 全文大小：1010 K
• 卷排序：130

文摘

By using a microwave-assisted method, we synthesized [Cu(1−x)Ag(x)]2S semiconductor nanoparticles with 0 ≤ x ≤ 1 and annealed them under an argon (Ar) atmosphere at 250 °C. Results of x-ray diffraction indicate that the as-synthesized samples are multiphase, but the number of phases decreases upon annealing under Ar atmosphere at 250 °C. Measurements of the band-gap energy show that, as the Ag concentration x increases from 0 to 0.5, the band-gap energy of [Cu(1−x)Ag(x)]2S decreases from 1.9 to 1.7 eV. However, upon further increasing the Ag concentration from 0.5 to 1.0, the band-gap energy of [Cu(1−x)Ag(x)]2S increases dramatically from 1.7 to 2.0 eV.