Layer-by-Layer Assembly of Aqueous Dispersible, Highly Conductive Poly(aniline-co-o-anisidine)/Poly(sodium 4-styrenesulfonate)/MWNTs Core–Shell Nanocomposites

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• 作者：Fei Wang ; Gengchao Wang ; Shu Yang ; Chunzhong Li
• 刊名：Langmuir
• 出版年：2008
• 出版时间：June 3, 2008
• 年：2008
• 卷：24
• 期：11
• 页码：5825 - 5831
• 全文大小：1436K
• 年卷期：v.24,no.11(June 3, 2008)
• ISSN：1520-5827

文摘

Poly(aniline-co-o-anisidine) (P(An-co-o-As)) ionomers and poly(sodium 4-styrenesulfonate) (PSS) were layer-by-layer (LbL) assembled on carboxylic acid-functionalized multiwalled carbon nanotubes (MWNTs). The multilayered polyelectrolyte greatly enhanced the dispersibility and stability of MWNTs in aqueous solutions. More importantly, the nanocomposites showed 3 orders of magnitude of conductivity increase, 4.2 S/cm, compared to that of neat ionomers, 0.004 S/cm. The deposition procedure was monitored with zeta (ζ) potential changes. Fourier transform infrared (FT-IR), ultraviolet−visible (UV–vis), and Raman spectra confirmed charge transfer from the quinoid units of the P(An-co-o-As) to MWNTs, which effectively delocalize the electrons. Further, we explored the pH response of the assembled P(An-co-o-As)/PSS/MWNTs multilayer nanocomposites. The sharp transition of the conductivity in the pH range of 2 to 6 makes the nanocomposites promising candidates for chemical-biological sensing.