Controllable synthesis of PbI₂ nanocrystals via?a?surfactant-assisted hydrothermal route

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• 作者：Gangqiang Zhu ; Peng Liu ; Mirabbos Hojamberdiev ; Jian-ping Zhou ; Xijin Huang ; Bo Feng and Rong Yang
• 关键词：PACS 62.23.Hj ; 73.22. ; f ; 78.22.Fd ; 81.20.Ka ; 81.16.Be ; 91.67.JK
• 刊名：Applied Physics A: Materials Science & Processing
• 出版年：2010
• 出版时间：February, 2010
• 年：2010
• 卷：98
• 期：2
• 页码：299-304
• 全文大小：605.6 KB

文摘

PbI₂ nanostructures were successfully prepared via a surfactant-assisted hydrothermal method at a low temperature of 100¡ãC for 8 h. Polyvinyl pyrrolidone (PVP) and cetyltrimethylammonium bromide (CTAB) were used as surfactants. The resulting products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and UV–vis spectroscopy. It was found that the formation of PbI₂ nanostructures with various morphologies could be well controlled by the adjustment of the pH of the synthesis solution, selection of suitable surfactant, and the amount of the desired surfactant. UV–vis absorption results showed an apparent shift of the band gap energy of the PbI₂ nanoparticles relative to that of the bulk.