Polyindole/ carboxylated-multiwall carbon nanotube composites produced by in-situ and interfacial polymerization
- 作者：Leela Joshi ; Arun Kumar Singh ; Rajiv Prakash ; rajivprakash12@yahoo.com
- 关键词：Conducting polymer ; Polyindole ; Composite materials ; Polymers ; Chemical synthesis ; Electrical characterisation
- 刊名：Materials Chemistry and Physics
- 出版年：2012
- 期刊代码：58_02540584
- 类别：ms
- 出版时间：16 July, 2012
- 卷：135
- 期：1
- 页码：80-87
- 文件大小：1792 K
摘要
Composites of polyindole (PIn), a conducting polymer, with carboxylated-multiwalled carbon nanotubes (c-MWCNT/PIn) were synthesized; the synthesis was done using (i) two miscible solvents (in-situ method) and (ii) two immiscible solvents (interfacial method). A tubular composite, with a uniform coating of the polymer over c-MWCNTs, was observed in the case of interfacial synthesis. However, the in-situ synthesis of c-MWCNT/PIn composites exhibited a densely packed spherical morphology, with c-MWCNT incorporated within the polymer spheres. The spherical morphology was probably obtained due to fast polymerization kinetics and the formation of micelles in case of in-situ polymerization, whereas tubular morphology was obtained in case of interfacial polymerization due to the sufficient time provided for the growth of polymer chains over the c-MWCNT surfaces. Nanoscale electrical properties of composites, in a metal/(c-MWCNT/PIn) configuration, were studied using current sensing atomic force microscopy. Interfacial c-MWCNT/PIn composite, on Al metal substrate, exhibited a typical rectifying diode behavior. This composite had manifested enormous potential for electronic applications and fabrication of nanoscale organic devices.