Electrical response behaviour of doped polyaniline conducting materials induced by THF vapour

• Published in: Materials research innovations Vol. 11; no. 3; pp. 148 - 153
• Main Authors: Li, Z. Q., Luo, Y. L., Zhang, K. P.
• Format: Journal Article
• Language: English
• Published: Taylor & Francis 01.09.2007
• Subjects: ELECTRICAL PROPERTIES; POLYANILINE; SODIUM DODEYLBENZENESULPHONATE; TETRAHYDROFURAN
• ISSN: 1432-8917; 1433-075X
• DOI: 10.1179/143307507X225632

Polyaniline conducting polymers (PANI) doped with hydrochloric acid (HCl) or sodium dodecylbenzenesulphonate-HCl (SDBS-HCl) were synthesised via the chemical oxidation polymerisation method. Fourier transform infrared spectrometer (FTIR) and Ultraviolet-visible absorption spectrometer (UV-vis) analyses show that the physicochemical properties of PANI changed by the gallimaufry of HCl or SDBS-HCl, leading to the following increasing order of conductivity, PANI<PANI-HCl<PANI-SDBS-HCl. Response of these materials to tetrahydrofuran (THF) saturated vapour at room temperature has been investigated in terms of their conductivity changes. The experimental results demonstrate that the SDBS-HCl doped PANI film is an excellent sensing material for THF vapour, showing higher sensitivity, better reversibility and linearity as well as faster response time than that of the HCl doped PANI film. The varied electrical behaviour upon exposure to THF vapour is associated with the protonation-deprotonation and swelling effects. Therefore, the SDBS-HCl doped PANI film has potentials in developing sensors for THF vapour detection.