纳米金刚石硼掺杂的制备及表征

Preparation and Characterization of Boron-Doped Nano Diamond

摘要:

本文采用高温真空扩散法制备了纳米金刚石硼掺杂。采用热重分析仪、X射线光电子能谱仪、X射线衍射仪、傅里叶变换红外光谱仪、智能型拉曼光谱仪、透射电子显微电镜等技术手段对制备的产物进行表征。结果表明,产物主要包含C、O、B元素,其质量分数为92.08%,7.14%,0.78%。纳米金刚石硼掺杂的XRD图谱中除了金刚石(111)D、(220)D衍射峰外,还有六方金刚石(100)D的衍射峰。B原子的引入造成纳米金刚石的缺陷增多,引起G峰移至1620cm-1。硼原子在金刚石中以两种状态存在,分别是C-B碳的取代原子和B-O的间隙硼原子。掺杂后的纳米金刚石颗粒形状形貌无明显变化,粒径为2~10nm,有少部分立方金刚石的存在。总而言之,硼的掺杂使得纳米金刚石的初始氧化温度提高了175℃,氧化速度缓慢,热稳定性能提高。

Abstract:

In this paper, boron-doped nanodiamond was prepared by high temperature vacuum diffusion methodat in a vacuum container. Thermogravimetric analyzer(TGA), X ray photoelectron spectroscopy(XPS), X ray diffraction(XRD), Fourier transform infrared spectroscopy(FTIR), Raman spectroscopy, transmission electron microscope (TEM)were used for characterization of the prepared work. The results show that the products mainly contain C, O and B, and the mass fraction is 92.08%, 7.14%, 0.78%. In addition to diamond (111) _D and (220) _D diffraction peaks, there is also hexagonal diamond (1 0 0)_D diffraction peaks in XRD picture of boron-doped product. The introduction of B atoms results in an increase in the defects of nanodiamond, causing the G peak to move to 1620cm_-1. Boron atoms mainly exist in two forms of substitutional carbon atoms (C-B) bonds and bonds with the impurity elements (B-O) in the diamond lattice. The shape and morphology of boron-doped nano diamond particles have no obvious change. The particle size is 2~ 10nm and a small amount of cubic diamond exist. In conclusion, the initial oxidation temperature of boron-doped nano diamond increases by 175℃, the oxidation rate is slow and the thermal stability is improved.