In situ doping polymerization of polyaniline microtubules in the presence of β-naphthalenesulfonic acid

✍ Scribed by Jie Huang; Meixiang Wan

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 276 KB
• Volume: 37
• Category: Article
• ISSN: 0887-624X
• DOI: 10.1002/(sici)1099-0518(19990115)37:2<151::aid-pola5>3.0.co;2-r

✦ Synopsis

Conducting microtubules of Polyaniline (PANI) were synthesized for the first time by the "in situ doping polymerization" method in the presence of ␤-naphthalenesulfonic acid (NSA) as dopant. Different doping methods, such as "immerse doping" and "grind doping," and different synthetic conditions, such as molar ratio of aniline (An) to NSA (An/NSA), concentration of NSA in the polymerization media, reaction temperature, and time were investigated to understand the formation of microtubules. It was found that the PANI-NSA microtubules can be formed only by the "in situ doping polymerization" method, and the above synthetic conditions strongly affect the formation of the PANI-NSA microtubules, especially the molar ratio of An to NSA. An optimal condition was found under which tubules with 1-3 m in diameter and 10 -50 m in length were obtained. The morphology of PANI-NSA tubules was proved by SEM and TEM, and their backbone structure was characterized by FTIR, UV-VIS, XPS, and X-ray diffraction. Results of these measurements showed that the molecular structures of the resulted PANI-NSA microtubules were identical to that of PANI-HCl synthesized by conventional method.