超长五重对称铜微米线的水热合成

Hydrothermal synthesis of ultra-long five-fold symmetric copper microwires

摘要:

本研究利用简单水热法制备了高质量的超长铜微米线，并采用X射线衍射仪（XRD）, 扫描电子显微镜（SEM）氮气吸附表征了产品的结构和形貌、织构性质。研究表明，所得铜微米线具有五重对称的正五棱柱状孪晶结构。铜微米线的形成，被归因于CTAB对铜{100}面的吸附和铜晶体结构内部张力的协同作用。并且研究了产品对过氧化氢辅助的罗丹明B的催化脱色性能。在微米铜上过氧化氢辅助的罗丹明B脱色反应的表观反应速率常数(ka=0.00484 min-1)为体相铜的(ka=0.0014 min-1) 3.5倍，归因为前者较高比表面和微米尺寸。本制备方法具有产率高（高达85.9%）、操作简单等优点，易于放大制备。

Abstract:

Ultra-long copper microwires have been prepared by a facile hydrothermal method and characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), nitrogen sorption isotherms. The results show that the ultra-long copper microwires have a five-fold symmetric twin crystal structure. It is proposed that both the selective adsorption of CTAB on {100} facets and the internal tension of copper crystals synergistically lead to the formation of the copper microwires. Moreover, the apparent rate constant (ka=0.00484 min-1) of copper microwires is 3.5 times as high as that (ka=0.0014 min-1) over bulk Cu for for the H2O2-assisted RhB decoloring reaction, which has been mainly ascribed to its larger surface area and microscale size. The adopted method can be potentially used for mass production of copper microwires because of the high yield and the simple operation.