Polyaniline-Titanium dioxide composite as humidity sensor at room temperature

Abstract

In the present work, Polyaniline (PANI) and Polyaniline-Titanium dioxide (PANI-TiO 2 ) composite have been synthesized separately by chemical polymerization of aniline without/with TiO 2 . Characteristic absorption bands of PANI and TiO 2 in the composite were confirmed by FT-IR studies, indicating the interaction of PANI with TiO 2 . Comparative study of XRD patterns of PANI and the composite confirmed superficial deposition of PANI on TiO 2 and the average size of the composite particle was found to be 25 nm. The aggregated granular porous morphology of the composite was confirmed by its SEM image. The composite's sensing response to humidity at room temperature was tested and was found to be 84.21 % in the range 25 % -95 % RH. The response and recovery time of the composite at 95 % RH were measured to be 60s and 100s respectively and its sensing stability over a period of one month was also confirmed.

State of the Art of Synthesized PANI-(Sn+2/TiO2) Nanocomposites for Conductive Application

“…As well as a peak at 808 cm−1, and 696 cm-1, are related to the (Ti-O) and (Sn-O) respectively. These peaks were confirmed the succeeded form of PANI/Sn/TiO2 [23,24,25]. The absorption changes in the peaks of PANI/Sn/TiO2 composites are perhaps due to the effective integration of the Sn/TiO2 within the chain of the polymer.…”

Optimized polyaniline‐transition metal oxide composites: A comparative study of alternating current conductivity via correlated barrier hopping model

“…The characteristic absorption bands of TiO 2 (Fig. 1c) at 647 and 418 cm 21 are attributed to Ti-O stretching vibration [11].…”

“…Nowadays, researchers are involved in improving the conducting properties of such polymers simultaneously trying to overcome their drawbacks such as poor chemical stability and poor mechanical strength by incorporating them with metals or metal oxides via chemical or electrochemical routes . Such systems, called organic–inorganic composites or hybrids, have proved to be highly flexible materials in terms of enhancing electrical and mechanical properties due to synergetic effects and thus have offered exciting opportunities in various fields such as super capacitors, sensors, and rechargeable batteries . In this work, to enhance the scope of such hybrids, we preferred PANI, a well known conducting polymer as an organic component because of its controllable electrical and chemical properties, simple preparation and low cost .…”

Artificial muscles driven by the cooperative actuation of electrochemical molecular machines. Persistent discrepancies and challenges

“…When any artificial muscle is checked in air, the presence of moisture in the ambient is enough, taking into account the great interaction of water vapors with conducting polymers, to be absorbed in the film [60,[112][113][114][115][116][117][118][119][120] or in the checking electrolyte (organic or ionic liquid). Most researchers use intermediate gold or platinum sputtered metal films trying to get most uniform electric fields in the muscle, but those metals are excellent catalyst for both, hydrogen or oxygen production at low cathodic or anodic, respectively, overpotentials [121,122].…”