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首页> 外文会议>2nd International Symposium on Physics and Technology of Sensors >Spectroscopic and morphological studies of polyaniline (PANI) — Carbon nanotubes (CNTs) nanocomposite synthesized via dynamic, liquid-liquid interfacial polymerization process and its application as optical pH sensor
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Spectroscopic and morphological studies of polyaniline (PANI) — Carbon nanotubes (CNTs) nanocomposite synthesized via dynamic, liquid-liquid interfacial polymerization process and its application as optical pH sensor

机译：动态，液-液界面聚合过程合成聚苯胺（PANI）-碳纳米管（CNTs）纳米复合材料的光谱学和形貌研究及其在光学pH传感器中的应用

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Herein, we report the development of highly water dispersible nanocomposite of conducting polyaniline and multiwalled carbon nanotubes (PANI-MWCNTs) via novel, `dynamic' or `stirred' liquid-liquid interfacial polymerization method using sulphonic acid as a dopant. MWCNTs were functionalized prior to their use and then dispersed in water. The nanocomposite was further subjected for physico-chemical characterization using spectroscopic (UV-Vis and FT-IR), FE-SEM analysis. The UV-VIS spectrum of the PANI-MWCNTs nanocomposite shows a free carrier tail with increasing absorption at higher wavelength. This confirms the presence of conducting emeraldine salt phase of the polyaniline and is further supported by FT-IR analysis. The FE-SEM images show that the thin layer of polyaniline is coated over the functionalized MWCNTs forming a `core-shell' like structure. The synthesized nanocomposite was found to be highly dispersible in water and shows beautiful colour change from dark green to blue with change in pH of the solution from 1 to 12 (i.e. from acidic to basic pH). The change in colour of the polyaniline-MWCNTs nanocomposite is mainly due to the pH dependent chemical transformation /change of thin layer of polyaniline.
机译：在这里，我们报告了通过使用磺酸作为掺杂剂的新型，“动态”或“搅拌式”液-液界面聚合方法，开发了导电聚苯胺和多壁碳纳米管（PANI-MWCNTs）的高水分散性纳米复合材料。 MWCNT在使用前先进行功能化，然后分散在水中。使用分光镜（UV-Vis和FT-IR），FE-SEM分析进一步对纳米复合材料进行理化表征。 PANI-MWCNTs纳米复合材料的UV-VIS光谱显示出自由载流子尾，在较高波长下吸收增加。这证实了存在聚苯胺的进行翡翠盐相的存在，并且得到了FT-IR分析的进一步支持。 FE-SEM图像显示，聚苯胺薄层覆盖在功能化的MWCNT上，形成“核-壳”状结构。发现合成的纳米复合材料在水中高度分散，并且随着溶液的pH值从1变化到12（即从酸性pH到碱性pH），显示出从深绿色到蓝色的美丽的颜色变化。聚苯胺-MWCNTs纳米复合材料的颜色变化主要归因于pH依赖的化学转化/聚苯胺薄层的变化。

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