Preparation of a Nanowire‐Structured Polyaniline Composite and Gas Sensitivity Studies

Abstract

To obtain organic nanowire sensors with high sensitivity and rapid response times, based on the inducement effect of surfactants during in situ polymerization, nanostructured polyaniline composites are obtained by using a chemical oxidation method by adding a small amount of surfactant. A casting method is employed on interdigitated carbon electrodes. The gas sensitivity to a series of chemical vapors is examined at room temperature. The results indicate that polyaniline with regular nanowire structure is obtained when succinic acid is added. The gas sensitivity and response rates of a film with nanowire structure are much better than those of conventional polyaniline films produced by means of organic solution spin coating methods. The film described in this work shows good selectivity to trimethylamine and other related gases and, the reaction being reversible with the use of high-purity nitrogen.

Preparation of Polyaniline Nanotubes via “Thin Glass Tubes Template” Approach and its Gas Response

“…[18,25] The PANI films were fabricated using a drop-coating technique. The films were deposited onto porcelain tube that consisted of 1 Â 1 mm 2 Pt electrode.…”

“…Furthermore, it is rather difficult to retain the ordered nanostructure of PANI nanotubes after removing the templates. [18] Obviously, all of these techniques, whether hard or soft, have their own merits as well as limitations. Despite the variety in these synthetic approaches to PANI nanotubes, the need for controlling over the morphology of pure PANI nanotubes using only a simple and effective method still remains a challenge.…”

Electrochemical Synthesis of Chitosan‐co‐polyaniline/WO3⋅nH2O Composite Electrode for Amperometric Detection of NO2 Gas

“…Gas sensors based on nanostructured materials have attracted much attention because of their increased sensitivity due to the high surface to volume ratios [9]. Recent development of polymer-metal nanocomposites, with every imaginable combination of physical and chemical characteristics, has led to the fabrication of efficient gas sensors [10 -12] that can be used for a wide range of applications [13].…”

Reversible Wettability Switching of Polyaniline‐Coated Fabric, Triggered by Ammonia Gas

“…[10] Much work has recently been performed towards the development of chemical sensors that utilize the sensitivity of electrical or optical properties of nanostructured PANI films, which exhibit a fast and reversible response even at room temperature. [12][13][14][15][16] To the best of our knowledge, however, little attention has been paid to the wettability switching that results from the reversibility of the physical properties of PANI. [17][18][19] Moreover, the reversibility and fast response time are also desirable for practical use.…”