Nano-Silver Mediated Polymerization of Pyrrole: Synthesis and Gas Sensing Properties of Polypyrrole (PPy)/Ag Nano-Composite
Abstract:Thermal polymerization of pyrrole was performed using silver nitrate as source of silver ions followed by its conversion to Polypyrrole (PPy)/Ag nano-comoposites without using any external oxidizing agent or solvent. The formation of PPy was monitored by UV-Visible absorption spectroscopy showing a band at ∼464 nm. XRD measurement confirmed characteristic peaks for face centered cubic (fcc) silver and presence of PPy at 2 theta of ∼23° suggesting the formation of PPy/Ag nanocomposite. Transmission electron microscopy (TEM) images showed non-aggregated spherical Ag nano-particles of about 5–10 nm. PPy/Ag thick film acts as a NH3 sensor at 100 °C, a H2S sensor at 250 °C and CO2 sensor at 350 °C. The thick films showed capability to recognize various gases at different operating temperature.
Document Type: Research Article
Publication date: September 1, 2011
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