Panchakarla L S, Govindaraj A, Rao C N R
Chemistry and Physics of Materials Unit, CSIR Center of Excellence in Chemistry and DST Unit on Nanoscience, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur PO, Bangalore 560 064, India.
ACS Nano. 2007 Dec;1(5):494-500. doi: 10.1021/nn700230n.
Double-walled carbon nanotubes (DWNTs) doped with nitrogen and boron have been prepared by the decomposition of a CH(4) + Ar mixture along with pyridine (or NH(3)) and diborane, respectively, over a Mo(0.1)Fe(0.9)Mg(13)O catalyst, prepared by the combustion route. The doped DWNTs bave been characterized by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy, electron energy loss spectroscopy, and Raman spectroscopy. The dopant concentration is around 1 atom % for both boron and nitrogen. The radial breathing modes in the Raman spectra have been employed along with TEM to obtain the inner and outer diameters of the DWNTs. The diameter ranges for the undoped, N-doped (pyridine), N-doped (NH(3)), and B-doped DWNTs are 0.73-2.20, 0.74-2.30, 0.73-2.32, and 0.74-2.36 nm, respectively, the boron-doped DWNTs giving rise to a high proportion of the large diameter DWNTs. Besides affecting the G-band in the Raman spectra, N- and B-doping affect the proportion of semiconducting nanotubes.
通过燃烧法制备的Mo(0.1)Fe(0.9)Mg(13)O催化剂，分别使CH(4)+Ar混合物与吡啶（或NH(3)）和乙硼烷分解，制备出了氮硼掺杂的双壁碳纳米管（DWNTs）。已通过透射电子显微镜（TEM）、X射线光电子能谱、电子能量损失谱和拉曼光谱对掺杂的DWNTs进行了表征。硼和氮的掺杂剂浓度均约为1原子%。拉曼光谱中的径向呼吸模式与TEM一起被用于获取DWNTs的内径和外径。未掺杂、氮掺杂（吡啶）、氮掺杂（NH(3)）和硼掺杂的DWNTs的直径范围分别为0.73 - 2.20、0.74 - 2.30、0.73 - 2.32和0.74 - 2.36 nm，硼掺杂的DWNTs中较大直径的DWNTs比例较高。除了影响拉曼光谱中的G带外，氮和硼掺杂还会影响半导体纳米管的比例。
