Gas sensing properties of layer-by-layer self-assembled ultrathin film of polyaniline/titanium dioxide

Ammonia Gas Sensing Behavior of Tanninsulfonic Acid Doped Polyaniline-TiO2 Composite

“…While the increase in concentration of ammonia gas corresponded to an increase in resistivity, in order to better assess the results, response values, response times, and recovery times were determined. Response values were calculated using the following formula, where the resistivity values are determined in a test gas (ammonia in this case) and in air (ambient environment) [ 21 , 34 , 36 , 37 , 42 ]. Response values were found to be higher in case of TANIPANI-TiO 2 when compared to TANIPANI alone.…”

“…Literature studies have identified that 50% TiO 2 -loaded PANI has superior gas sensing activity when compared to other PANI-TiO 2 compositions. Several studies have explained the superior activity of the composites by this mechanistic approach; doped polyaniline is a hole conductor (p-type) material whereas the TiO 2 is a good electron acceptor (n-type), when mixed together they can form a p-n junction [ 28 , 31 , 36 , 37 ]. The developed p-n junction is sensitive to different gases depending on electron donating/electron accepting nature of the gas.…”

Facile preparation of a composite of TiO2 nanosheets and polyaniline and its gas sensing properties

“…Forming composites with conducting polymers, including polyaniline (PANI), polypyrrole (PPy), etc., is proved to be an effective method to address the problem. [23][24][25][26][27] In particular, the composite of nanostructured TiO 2 and PANI received most attention, due to the prominent merits of PANI, such as low cost, reasonable stability and wide range of conductivity modulation by interactions with a large spectrum of gases. The morphology and nanostructure of the sensing materials are known to have a great effect on the sensing performance.…”

“…24 We also fabricated the composite of PANI with TiO 2 nanoparticles by electrostatic self-assembly, and revealed its fast response, and good reversibility and repeatability towards NH 3 of low concentrations. 25 However, to our best knowledge, there have been no reports on two dimensional (2D) nanostructured TiO 2 with PANI for the applications as gas sensors. It is proposed that the inorganic semiconductors with 1D structure could facilitate directional charge motion, and reduce the contact resistance, thus enhance the sensing behaviors.…”

A high sensitivity alcohol gas sensor based on TiO<inf>2</inf> thin films

“…In recent years, a number of materials have been investigated as sensing materials for gas sensors [1][2][3]. These materials include oxide semiconductors, carbon nanobute (CNT) [4] and graphene [5].…”