Hydrothermal Synthesis of Microscaled Cu@C Polyhedral Composites and Their Sensitivity to Convergent Electron Beams

详细信息    查看全文

• 作者：Qin Hao ; Liqiang Xu ; Guangda Li ; Yitai Qian
• 刊名：Langmuir
• 出版年：2009
• 出版时间：June 2, 2009
• 年：2009
• 卷：25
• 期：11
• 页码：6363-6367
• 全文大小：863K
• 年卷期：v.25,no.11(June 2, 2009)
• ISSN：1520-5827

文摘

Copper microparticles (2−5 um) encapsulated in carbonaceous shell polyhedral composites were mildly prepared via a one-pot hydrothermal process using copper nitrate, glucose, and sodium citrate at 150 °C, in which the glucose was found to play reducer and graphite source roles during the formation of these core−shell-like composites. Thermal stability results indicated that their weights remain almost unchanged below 240 °C in ambient atmosphere. It is interesting that the copper microparticles could be partially released out and translated into monodisperse Cu nanoparticles around the initial composites under the convergent electron beams in a transmission electron microscope (TEM). This phenomenon is an appealing discovery, which might endow the Cu@C composite with new functions; for example, it might be applied as a sensitive detector for the leakage of electron beams or other substances for the sake of being a safeguard. In addition, the corresponding hollow carbonaceous polyhedra were also obtained after the acid treatment, which might be used as a template to fabricate other kinds of polyhedra.