Vertically aligned carbon nanotubes from natural precursors by spray pyrolysis method and their field electron emission properties
Vertically aligned carbon nanotubes from natural precursors by spray pyrolysis method and their field electron emission properties
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DOI：
10.1007/s00339-008-4856-9
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
P. Ghosh;T. Soga;M. Tanemura;M. Zamri;T. Jimbo;R. Katoh;K. Sumiyama
中科院分区：
文献类型：
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作者：
P. Ghosh;T. Soga;M. Tanemura;M. Zamri;T. Jimbo;R. Katoh;K. Sumiyama
以植物源碳氢化合物：松节油和桉树油为原料，采用简单的喷雾热解法，在700°C和常压下，以Fe为催化剂，在Si（100）衬底上制备了垂直取向的碳纳米管。采用扫描电子显微镜（SEM）、透射电子显微镜（TEM）、高分辨透射电子显微镜（HRTEM）、热重分析（TGA）、差热分析（DTA）和拉曼光谱对碳纳米管进行了表征。结果表明，由松节油生长的碳纳米管比由桉叶油生长的碳纳米管具有更好的石墨化程度和场发射性能。松节油和桉叶油生长的碳纳米管表明，在10 μA/cm 2下，开启电场分别约为1.7和1.93 V/μm。在1 mA/cm 2电流密度下，松节油和桉叶油纳米管的阈值电场分别为2.13和2.9V/μm。此外，松节油生长的碳纳米管相对于桉树油生长的碳纳米管显示出更高的电流密度。当电流密度为15.3mA/cm 2时，对应于从松节油中生长的纳米管，电流密度为15.3V/μm。提高的场发射性能归因于提高的结晶度，更少的缺陷，和更长的长度的松节油生长的碳纳米管。
Vertically aligned carbon nanotubes have been synthesized from botanical hydrocarbons: Turpentine oil and Eucalyptus oil on Si(100) substrate using Fe catalyst by simple spray pyrolysis method at 700°C and at atmospheric pressure. The as-grown carbon nanotubes were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution TEM (HRTEM), thermogravimetric analysis (TGA), differential thermal analysis (DTA), and Raman spectroscopy. It was observed that nanotubes grown from turpentine oil have better degree of graphitization and field emission performance than eucalyptus oil grown carbon nanotubes. The turpentine oil and eucalyptus oil grown carbon nanotubes indicated that the turn-on field of about 1.7 and 1.93 V/μm, respectively, at 10 μA/cm2. The threshold field was observed to be about 2.13 and 2.9 V/μm at 1 mA/cm2of nanotubes grown from turpentine oil and eucalyptus oil respectively. Moreover, turpentine oil grown carbon nanotubes show higher current density in relative to eucalyptus oil grown carbon nanotubes. The maximum current density of 15.3 mA/cm2was obtained for ∼3 V/μm corresponding to the nanotubes grown from turpentine oil. The improved field emission performance was attributed to the enhanced crystallinity, fewer defects, and greater length of turpentine oil grown carbon nanotubes.