Author:
Srivastava Sanjay K,Vankar VD,Kumar Vikram,Singh VN
Abstract
Abstract
Carbon nanotube (CNT) films were grown by microwave plasma-enhanced chemical vapor deposition process on four types of Si substrates: (i) mirror polished, (ii) catalyst patterned, (iii) mechanically polished having pits of varying size and shape, and (iv) electrochemically etched. Iron thin film was used as catalytic material and acetylene and ammonia as the precursors. Morphological and structural characteristics of the films were investigated by scanning and transmission electron microscopes, respectively. CNT films of different morphology such as vertically aligned, randomly oriented flowers, or honey-comb like, depending on the morphology of the Si substrates, were obtained. CNTs had sharp tip and bamboo-like internal structure irrespective of growth morphology of the films. Comparative field emission measurements showed that patterned CNT films and that with randomly oriented morphology had superior emission characteristics with threshold field as low as ~2.0 V/μm. The defective (bamboo-structure) structures of CNTs have been suggested for the enhanced emission performance of randomly oriented nanotube samples.
Publisher
Springer Science and Business Media LLC
Subject
Condensed Matter Physics,General Materials Science
Reference43 articles.
1. Iijima S: Nature. 1991, 354: 56. COI number [1:CAS:528:DyaK38Xmt1Ojtg%3D%3D] 10.1038/354056a0
2. Spindt CA: J Appl Phys. 1968, 39: 3504. COI number [1:CAS:528:DyaF1cXksVOitL4%3D] 10.1063/1.1656810
3. P. Gröning, L. Nilsson, P. Ruffieux, R. Clergereaux, O. Gröning, in Encyclopedia of Nanoscience and Nanotechnology, vol. 1, ed. by H.S. Nalwa (American Scientific Publishers, 2004), p. 547
4. Rinzler AG, Hafner JH, Nikolaev P, Lou L, Kim SG, Tomanek D, et al.: Science. 1995, 269: 1550. COI number [1:CAS:528:DyaK2MXotVOgsbo%3D] 10.1126/science.269.5230.1550
5. de Heer WA, Châtelain A, Ugarte D: Science. 1995, 270: 1179. 10.1126/science.270.5239.1179
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