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Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Structural Modification in Carbon Nanotubes by Boron Incorporation | Nanoscale Res Lett 2009 4 789-793 DOI 10.1007 S11671-009-9315-9 NANO EXPRESS Structural Modification in Carbon Nanotubes by Boron Incorporation Sangeeta Handuja P. Srivastava V. D. Vankar Received 2 March 2009 Accepted 2 April 2009 Published online 25 April 2009 to the authors 2009 Abstract We have synthesized boron-incorporated carbon nanotubes CNTs by decomposition of ferrocene and xylene in a thermal chemical vapor deposition set up using boric acid as the boron source. Scanning and transmission electron microscopy studies of the synthesized CNT samples showed that there was deterioration in crystallinity and improvement in alignment of the CNTs as the boron content in precursor solution increased from 0 to 15 . Raman analysis of these samples showed a shift of 7 cm-1 in wave number to higher side and broadening of the G band with increasing boron concentration along with an increase in intensity of the G band. Furthermore there was an increase in the intensity of the D band along with a decrease in its wave number position with increase in boron content. We speculate that these structural modifications in the morphology and microstructure of CNTs might be due to the charge transfer from boron to the graphite matrix resulting in shortening of the carboncarbon bonds. Keywords Carbon nanotubes Boron Scanning electron microscopy Transmission electron microscopy Raman spectroscopy X-ray diffractometry Introduction Carbon nanotubes CNTs an allotrope of carbon show modifications in properties when impurities like boron nitrogen and lithium are deliberately introduced in their matrix 1-3 . Defects generated in CNTs due to S. Handuja P. Srivastava El V. D. Vankar Nanostech Laboratory Department of Physics Indian Institute of Technology Delhi Hauz-Khas New Delhi 110016 India e-mail pankajs@physics.iitd.ernet.in introduction of these impurities could offer a possible route to tune their structural physical and electronic properties and thus have a significant bearing on a
