硼碳氮纳米管的制备及其表征

Preparation of B-C-N nanotube and its characterization

以石墨粉和硼粉为原料,采用机械球磨法,在氨气气氛下球磨120h,然后在1200℃氨气条件下热处理6h, 成功的制备出竹节状的B-C-N纳米管.利用X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电镜(TEM)、高分辨透射电子显微镜(HRTEM)以及电子能量损失谱(EELS)等手段进行了表征.纳米管的直径在50～180nm之间,长度可达20μm. EELS定量分析计算结果表明,纳米管由硼、碳和氮元素组成, 其B∶C∶N原子比为0.49∶1.00∶0.11,并对纳米管的形成机理进行了初步探讨.

B-C-N nanotube with bamboo-like structure was synthesized by heating ball milled mixture of boron powder and graphite powder in flowing ammonia gas stream at 1200°C. The synthesized product was characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), electron diffraction (ED), high-resolution transmission electron microscopy (HRTEM), and electron energy loss spectroscopy (EELS). The diameter of nanotube was in the range of 50-180 nm and the length is about 20 μm. The result of EELS suggested that the nanotube was composed of elements of B, C and N, and the calculated B/C/N atomic ratio was 0.49 : 1.00 : 0.11. The growth mechanism of B-C-N nanotube was also discussed tentatively.