Electrical and Gas Sensing Behaviour of Polypyrrole/silver Sulphide Nanocomposites

Bharati Yeole¹, Tanushree Sen¹, Dharmesh Hansora¹ and Satyendra Mishra^1,

¹University Institute of Chemical Technology, North Maharashtra University, Jalgaon, MS

Cite this paper:
Bharati Yeole, Tanushree Sen, Dharmesh Hansora and Satyendra Mishra. Electrical and Gas Sensing Behaviour of Polypyrrole/silver Sulphide Nanocomposites. American Journal of Sensor Technology. 2017; 4(1):10-20. doi: 10.12691/ajst-4-1-2

Abstract

We investigated the room temperature NH₃ sensing performance of polypyrrole/silver sulphide (PPy/Ag₂S) nanocomposites (NCs). Sonochemically synthesized Ag₂S nanoparticles (80-100 nm) were incorporated into the PPy matrix via ultrasound-assisted in-situ polymerization. The resulting PPy/Ag₂S NCs were evaluated based on structural, morphological, and electrical properties. Microscopy results revealed a uniform dispersion of Ag₂S nanoparticles in the PPy matrix. We studied the effect of Ag₂S nanoparticle concentration on the electrical properties and gas sensing performance of the PPy/Ag₂S NCs. The current-voltage (I-V) characteristics revealed the semiconducting nature of the PPy/Ag₂S NCs. An improvement in the electrical conductivity was observed for the PPy/Ag₂S NC with 3 wt% Ag₂S nanoparticle content. PPy/Ag₂S NCs were further tested for detection of NH₃ in ambient conditions. The PPy/Ag₂S NCs exhibited excellent sensor response towards 100 ppm NH₃ concentration at room temperature.

Keywords:
silver sulphide polypyrrole nanocomposites ammonia sensing

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