Structural Analysis of Single Wall Carbon Nanotubes Exposed to Oxidation and Reduction Conditions in the Course of Gamma Irradiation

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• 作者：Svetlana P. Jovanovi膰 ; Zoran M. Markovi膰 ; Du拧ka N. Kleut ; Miroslav D. Drami膰anin ; Ivanka D. Holclajtner-Antunovi膰 ; Momir S. Milosavljevi膰 ; Valeria La Parola ; Zois Syrgiannis ; Biljana M. Todorovi膰 Markovi膰
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：July 24, 2014
• 年：2014
• 卷：118
• 期：29
• 页码：16147-16155
• 全文大小：571K
• ISSN：1932-7455

文摘

Single wall carbon nanotubes (SWCNTs) were exposed to gamma irradiation in oxidative (H₂O, NH₄OH) and reductive (H₂O and NH₄OH both mixed with isopropyl alcohol) media. The structure has been investigated with microscopic (atomic force and transmission electron microscopy), spectroscopic (Raman, X-ray photoelectron, and FTIR spectroscopy) techniques, and by thermogravimetric analysis. Reductive media offer the possibility for green chemistry reduction of SWCNTs: after gamma irradiation, SWCNTs lose C鈥揙 bonds. Furthermore, irradiation in these media increases the fraction of sp² hybridized carbon atoms in structure of SWCNTs and prevents their amorphization. The presence of isopropyl alcohol in reductive media contributed to the preservation of structure鈥檚 unity. On the other hand, the most effective procedure is the one that occurs in oxidative media and yields in debundled, cut, and annihilated carbon nanotubes. The smaller diameter and the metallic ones are the most affected.