Fabrication of Core−Shell Structure of M@C (M=Se, Au, Ag2Se) and Transformation to Yolk−Shell Structure by Electron Beam Irradiation or Vacuum Annealing

详细信息    查看全文

• 作者：Jixin Zhu ; Ting Sun ; Huey Hoon Hng ; Jan Ma ; Freddy Yin Chiang Boey ; Xiongwen Lou ; Hua Zhang ; Can Xue ; Hongyu Chen ; Qingyu Yan
• 刊名：Chemistry of Materials
• 出版年：2009
• 出版时间：August 25, 2009
• 年：2009
• 卷：21
• 期：16
• 页码：3848-3852
• 全文大小：867K
• 年卷期：v.21,no.16(August 25, 2009)
• ISSN：1520-5002

文摘

Selenium @ carbon core−shell spheres have been synthesized via a simple one-step hydrothermal carbonization process using sucrose and sodium selenite as precursors. Metal selenide or noble metal, e.g. Ag₂Se or Au, can be easily encapsulated into the carbon shell by using the as-prepared Se@C core−shell samples as site templates. The transformation from core/shell to yolk/shell structure, e.g. Se@C, Au/Se@C and Ag₂Se@C, can be achieved through thermal evaporation under electron beam irradiation or vacuum annealing to evaporate Se. The optical absorption of the samples can be tuned by varying the structure/compositions of the samples.