Probing the transient fate of C-N bonding in hydrazine-treated carbon nanotubes by synchrotron photoelectron spectroscopy

Pen Cheng Wang, Yu Chun Liao, Li Hung Liu, Yu Ling Lai, Ying Chang Lin, Ching Yuan Su, Yao Jane Hsu

研究成果: 書貢獻/報告類型會議論文篇章同行評審

2 引文 斯高帕斯(Scopus)

摘要

The properties of hydrazine-treated carbon nanotubes (CNTs) were investigated by synchrotron photoelectron spectroscopy. The surfactant-free CNTs used in this study were synthesized by alcohol catalytic chemical vapor deposition. When the CNTs subject to the vapor-phase hydrazine treatment and the 80° C-baking treatment were probed by ultraviolet photoelectron spectroscopy (UPS), the results showed (i) damaged π-bonding and (ii) the shift of the CNTs' Fermi level toward the conduction band. A further 350°C-baking treatment on the hydrazine-treated CNTs could restore the damaged π-bonding and cause the CNTs' Fermi level to shift back toward the valence band. The results obtained from UPS indicated that the above interaction between hydrazine and CNTs was a thermally metastable chemical adsorption. When the CNTs subject to the vapor-phase hydrazine treatment and the 80° C-baking treatment were probed by X-ray photoelectron spectroscopy (XPS), the results showed a significant increase in the spectral intensity of the signal corresponding to C-N bonding in the XPS profile. A further 350° C-baking treatment on the hydrazine-treated CNTs could essentially eliminate the spectral intensity of the signal corresponding to C-N bonding in the XPS profile. Our experimental results show that the transient fate of the thermally metastable C-N bonding is associated with the nitrogenous radicals, such as nitrene and amidogen, thermally decomposed from hydrazine. The chemical association of nitrogenous radicals with CNTs generates metastable amino/aziridino derivatization on the surface of CNTs, which will disrupt the continuum of CNTs' graphitic domains. Upon further baking, the disruptive functionalization can be eliminated to restore the graphitic sp2-carbon bonding structure.

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主出版物標題Physical Chemistry of Interfaces and Nanomaterials XII
DOIs
出版狀態已出版 - 2013
事件Physical Chemistry of Interfaces and Nanomaterials XII - San Diego, CA, United States
持續時間: 25 8月 201328 8月 2013

出版系列

名字Proceedings of SPIE - The International Society for Optical Engineering
8811
ISSN(列印)0277-786X
ISSN(電子)1996-756X

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???event.eventtypes.event.conference???Physical Chemistry of Interfaces and Nanomaterials XII
國家/地區United States
城市San Diego, CA
期間25/08/1328/08/13

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