Micro-structural, electron-spectroscopic and field-emission studies of carbon nitride nanotubes grown from cage-like and linear carbon sources
Micro-structural, electron-spectroscopic and field-emission studies of carbon nitride nanotubes grown from cage-like and linear carbon sources
复制标题
DOI：
10.1016/j.carbon.2009.02.007
复制
发表时间：
2009-05-01
期刊：
影响因子：
10.9
通讯作者：
Ando, Yoshinori
中科院分区：
文献类型：
--
作者：
Ghosh, Kaushik;Kumar, Mukul;Ando, Yoshinori
使用常规化学气相沉积在800摄氏度在大气压下，N掺杂的碳纳米管（CNT）生长从两个前体：（i）从笼状碳源：樟脑，使用二甲基甲酰胺（DMF）作为氮源;和（ii）从直链氨基烃：十八胺，作为碳和氮的双重来源。研究表明，前驱体的分子结构对纳米管的结构性能起着重要的控制作用。虽然在这两种情况下的纳米管具有竹状结构，但电子显微镜显示它们的微观结构存在显着差异。虽然双氰胺-DMF-生长的碳纳米管（CD-CNT）具有波纹状外壁和圆形尖端，但十八胺-生长的碳纳米管（OD-CNT）是直的并且具有锥形尖端。氮水平的定量和定性测定是基于XPS和EELS分析进行的，在CNT体和尖端区域分配不同的氮部分（吡啶，吡咯和石墨取代）。通过显微拉曼光谱、热重分析和BET比表面积分析表明，相对于CD-CNTs，OD-CNTs具有更高的结晶度、更高的热稳定性和更高的比表面积。这些行为的差异解释的生长化学以及在CNT矩阵中的不同的氮部分的作用。(C)2009爱思唯尔有限公司保留所有权利。
Using conventional chemical vapor deposition at 800 degrees C at atmospheric pressure, N-doped carbon nanotubes (CNTs) were grown from two precursors: (i) from a cage-like carbon source: camphor, using dimethylformamide (DMF) as a nitrogen source; and (ii) from a linear-chain aminohydrocarbon: octadecylamine, as a dual source of carbon and nitrogen. The study suggests that the molecular structure of the precursor plays an important role in governing the structural proper-ties of the resulting nanotubes. Although the nanotubes have bamboo-like structure in either case, electron-microscopy reveals remarkable differences in their microstructure. While camphor-DMF-grown carbon nanotubes (CD-CNTs) have corrugated outer walls and rounded tips, the octadecylamine-grown ones (OD-CNTs) are straight and have tapered tips. Quantitative as well as qualitative determination of nitrogen level is done based on XPS and EELS analyses, assigning different nitrogen moieties (pyridinic, pyrrolinic and graphitic-substitute) in the CNT-body and tip regions. Relative to CD-CNTs, the OD-CNTs have higher crystallinity, higher thermal stability and higher specific surface area, as determined by micro-Raman, TGA and BET analyses, respectively The field emission properties of CD-CNTs are typically good, while those of OD-CNTs are better. These behavioral differences are explained in terms of the growth chemistry as well as the role of different nitrogen moieties in the CNT matrix. (C) 2009 Elsevier Ltd. All rights reserved.