水热还原法制备Ag@C壳核纳米结构及其表征  

Preparation and Characterization of Ag@C Core/shell Nanoparticle by Hydrothermal Reduction Method

作　　者：张乐[1] 杨超[1] 田熙科[1] 皮振邦[1] 上官春晓[1] 

机构地区：[1]中国地质大学（武汉）,湖北武汉430074

出　　处：《纳米科技》2010年第1期73-77,81,共6页

摘　　要：以棉花纤维制备的纤维素微晶为碳源，采用水热还原法制备了Ag@C壳核结构纳米颗粒，并用扫描电子显微镜、投射电子显微镜、X射线能谱仪、X射线衍射仪对产品进行表征，结果表明，所得产品为Ag@C核／壳结构纳米颗粒，外壳是碳层，内核为纳米银颗粒。最佳的制备条件是，180％反应15h，pH=1-2，纤维素微晶的浓度为0．083g／L。讨论了碳包银核／壳结构的生长机理，Ag@C core/shell nanoparticle was prepared by hydrothermal reduction with cellulose microcrystalline obtained from cotton fiber. The products were characterized by SEM, TEM, EDS and XRD, respectively. The results showed that as-prepared products were Ag@C core/shell nanoparticles with silver nanoparticles inside and a carbon surface outside. The optimum reaction conditions are hydrothemaal treatment at 180℃ for 15h, PH=1-2 and the concentration of cellulose crystallites is 0.083 g/L. The growth mechanism of Ag@C core/shell structure was studied and it contains two steps.

关 键 词：水热还原法 纤维素微晶 核/壳结构 纳米颗粒 

分 类 号：TB34[一般工业技术—材料科学与工程]