Enhanced Electrical Properties of Transparent Carbon Nanotube/Binder Hybrid Thin Films: Effects of the Silane Sol and the Bundle Size of the Carbon Nanotubes

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• 作者：Joong Tark Han ; Sun Young Kim ; Jun Suk Kim ; Hee Jin Jeong ; Seung Yol Jeong ; Geon-Woong Lee
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2010
• 出版时间：July 21, 2010
• 年：2010
• 卷：49
• 期：14
• 页码：6416-6421
• 全文大小：312K
• 年卷期：v.49,no.14(July 21, 2010)
• ISSN：1520-5045

文摘

We report the effects of intermolecular interactions at the few-walled carbon nanotubes (FWNTs)/binder interface and the bundle size of the acid-treated FWNTs on the electrical properties of FWNTs/silane sol hybrid films. The bundle size of the FWNTs was successfully controlled by using acid treatment; assembled bundle structures due to hydrogen bonding were observed only for FWNTs functionalized with hydroxyl groups (FWNTs-OH). It was also confirmed by measuring the UV absorbance that the FWNTs-OH even form bundled structures in the solution state. Tetraethylorthosilicate (TEOS) and methyltriethoxysilane (MTMS) sols were used to manipulate the intermolecular interactions between the nanotubes and binder. We found that the hybridization of relatively large bundled FWNTs with TEOS sol unfavorable to hydrophobic nanotube surfaces enhanced the electrical properties of thin films prepared by spray coating. Moreover, the Raman spectrum of the bundled FWNTs-OH is not affected by the silane sol, whereas the D-to-G ratio and the G band position of the unbundled FWNTs-COOH is noticeably influenced by the silane sol.