Effect of electrical properties on gas sensitivity of polypyrrole/cds nanocomposites

Abstract

In the present work, polypyrrole (PPy) nanocomposites were synthesized using ferric chloride (FeCl 3 ) as an oxidant by in situ polymerization at room temperature. Cadmium sulfide (CdS) nanoparticles were synthesized by ultrasonication technique with size ranging between 60 and 110 nm. The PPy/CdS nanocomposites were prepared by taking 1-3 wt % loading of CdS to measure the electrical conductivity. The PPy nanocomposites were characterized by using FTIR, X-ray diffraction, UV, and SEM. Furthermore, these PPy/CdS nanocomposites were investigated to study their effect of electrical properties on gas sensitivity of ammonia and LPG. The nanocomposites showed improvement in conductivity and sensing response toward 250 ppm NH 3 was found to be maximum (4.2) compared with 100 and 500 ppm NH 3 gas, whereas in the case of LPG, it showed sensitive response.

Polypyrrole/Metal Sulphide Hybrid Nanocomposites: Synthesis, Characterization and Room Temperature Gas Sensing Properties

“…[1][2][3][4][5][6][7] Over the decade, there has been a steady progress in the applications of conjugated conducting polymers (CPs) such as in chemical sensors, electrochemical supercapacitors, electro chromic and photovoltaic devices, light-emitting diodes and batteries. The years in the last decade have also witnessed consistent efforts by researchers in improving the physical and structural properties of CPs.…”

“…The years in the last decade have also witnessed consistent efforts by researchers in improving the physical and structural properties of CPs. 1,[5][6][7][8][9][10][11][12] The physical and structural attributes of CPs are generally affected by crucial parameters such as polymerization method, type of the oxidant, pH and temperature conditions during polymerization, etc. In recent times, however, tuning of CPs' properties has also been attempted by use of nanomaterials.…”

“…Selection of appropriate nanomaterial for a CP is crucial to the ultimate application of the resulting nanocomposites, which is generally a result of the synergistic effect between the CP and the nanomaterial. 5,7,[12][13][14] Using nanotechnology, various macromolecules and nanomaterials have been used for gas sensing purposes 15,16 and amongst them metal oxides 17,18 and CPs 19 are most widely used. A silver nanocrystal has been reported as a promoter for carbon nanotube-based gas sensors at room-temperature.…”

“…[7][8][9][21][22][23] Bulk production of PPy is also possible by oxidative polymerization of pyrrole in aqueous or non-aqueous media. Various methods and routes have been successfully used to prepare PPy and their nanostructures.…”

“…Various methods and routes have been successfully used to prepare PPy and their nanostructures. 7,[21][22][23] Various metals, metal oxides and metal sulphide nanoparticles have been incorporated in PPy matrix and the resulting CP nanocomposites showed an improvement in their properties. In particular, these nanocomposites have shown much promise as sensors for a range of analytes.…”