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

Abstract

The present research work explores the room temperature gas sensing ability of hybrid nanocomposites of metal sulphide nanoparticles with polypyrrole (PPy) matrix. Sonochemically synthesized both silver sulphide (Ag 2 S) and cadmium sulphide (CdS) nanoparticles were mixed in varying ratios with PPy matrix by in-situ oxidative polymerization route. The resulting PPy/(Ag 2 S:CdS) hybrid nanocomposites were analyzed by characterizing them using FTIR and UV-Visible spectroscopy, XRD, SEM, fourprobe conductivity method and gas sensing ability by two-probe gas sensing setup. The current-voltage (I-V) characteristics of the PPy hybrid nanocomposites revealed their semiconducting nature with an electrical conductivity in the range of 10 −4 to 10 −3 S/cm. As compared to pure PPy, their hybrid PPy/ (Ag 2 S:CdS) nanocomposites showed an enhancement in sensitivity towards ammonia gas detection. The results clearly indicated a synergistic effect between the Ag 2 S:CdS nanoparticles and the PPy matrix.

DC electrical conductivity and rate of ammonia vapour-sensing performance of synthetic polypyrrole–zirconium(IV) phosphate cation exchange nanocomposite

“…The values of the saturated vapor pressure were obtained from Lange's handbook of chemistry by John A. Dean, Fifteenth Edition, Mc Graw-Hill, Inc. [27].Taking into account of some other ammoniasensing composite materials like Polypyrrole graphitic nanocomposite [28], Polypyrrole/Metal Sulphide nanocomposite [29], poly(3-methythiophene)-titanium(IV) molybdophosphate cation exchange nanocomposite [6] and polyaniline-titanium(IV) phosphate cation exchange nanocomposite [8] reported earlier and compared with PPy-ZrP for ammonia sensing, the following observation can be noted (Fig. 10).…”

Polyaniline/zinc oxide nanocomposite as room‐temperature sensing layer for methane

“…We have previously reported the sensing performance of several PANI and polypyrrole systems [15,18,[29][30][31]. In this work, we report the development of PANI/ZnO nanocomposite sensor for RT methane detection.…”

Development of Poly (butylene adipate-co-terephthalate) Filled with Montmorillonite-Polypyrrole for Pressure Sensor Applications

“…These materials are composed of an insulating polymer matrix and a dispersed phase of intrinsically conducting polymer (ICP) [10][11][12][13][14] , such as polypyrrole (PPy) or polyaniline (PAni), or carbonaceous fillers, such as carbon black [15][16][17] and graphite 18 . Among available conducting fillers, several works in the literature have reported the use of conducting polymers, especially PPy, for sensing applications 1,5,8,9,[19][20][21][22][23][24][25][26][27][28] . Merlini et al described the development of poly(vinylidene fluoride) (PVDF) / polypyrrole (PPy) blends, and the maximum sensitivity was obtained for a blend with 9 wt% PPy.…”