Ni-Coated Polyaniline Nanowire As Chemical Sensing Material for Cigarette Smoke

作者：Chowdhury Devasish^*

来源：Journal of Physical Chemistry C, 2011, 115(28): 13554-13559.

DOI：10.1021/jp2039306

PANI-CSA-Ni composite nanowire was successfully synthesized using camphor sulfonic acid (CSA) as dopant as well as surfactant. In this process, CSA-ANI micelles act as soft template facilatating the formation of PANI nanowire. PANI-CSA-Ni nanowire composite was characterized by transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FTIR), and thermogravimetric analysis (TGA). The use of PANI-CSA-Ni composite nanowire as sensing material was also investigated. It was observed that PANI-CSA-Ni nanowire composite shows nearly four order decrease in ac impedance in the presence of cigarette smoke. Therefore, such material has potential for use in cigarette smoke detector. Impedance response in the presence of controls like carbon dioxide and carbon monoxide was also measured. It was observed that whereas carbon dioxide gas has a negligible role in the change in ac impedance, there was a half-order change in impedance response in the presence of carbon monoxide (CO), hinting the possibility of CO as one of the contributing constituents of observed impedance response in cigarette smoke. However, no signature for the formation of Ni(CO)(4) was identified from FTIR spectrum. We believe that derivatives of polyaromatic hydrocarbon (PAH) and alkaloid like nicotine present in cigarette smoke form a charge transfer complex with Ni as the binding site on the polymer nanowire as a result, the mobile charge carrier increases in the system thus decreasing the ac impedance.

• 出版日期2011-7-21