摘要： ► Discovery of a facile method to n-dope carbon nanotubes by vapor-phase hydrazine. ► Confirming covalently bound sulfonic groups on CNTs treated with sulfuric acid. ► Spectroscopic investigation of CNTs’ bonding structures after hydrazine treatment. ► Proposing a cycloaddition reaction between graphenic domains of CNTs and reactive nitrogen-containing radicals thermally decomposed from hydrazine. ► Establishing aziridine as a probable n-doping chemical entity on hydrazine-treated CNTs. It was found in this study that a facile vapor-phase hydrazine (N2H4) treatment could effectively convert pristine and even p-doped sulfuric-acid-treated single-walled cabon nanotubes (SWCNTs) to n-type materials. The Raman spectroscopy results show that the facile vapor-phase hydrazine treatment could suppress the intensity of SWCNTs’ radial breathing modes and alter SWCNTs’ D-band vs. G-band intensity ratio. The sheet resistance measurement results show that the n-doping effect exerted by the vapor-phase hydrazine treatment could overwhelmingly counteract sulfuric acid's p-doping effect and subdue the SWCNTs’ acquired p-type characteristics rendered by the sulfuric acid treatment. The ultraviolet photoelectron spectroscopy and X-ray photoelectron spectroscopy results suggest that certain reactive nitrogen-containing radicals thermally decomposed from hydrazine, such as nitrene and amidogen, could covalently functionalize CNTs and then n-dope the functionalzed CNTs. 出版者： Elsevier B.V 出版日期： 2012-05-15 出處： Materials Chemistry and Physics, 2012-05, Vol.134 (1), p.325-332 版權： 2012 Elsevier B.V. 識別號： ISSN: 0254-0584 識別號： EISSN: 1879-3312 識別號： DOI: 10.1016/j.matchemphys.2012.02.072
