Abstract: We describe the successful synthesis of Polypyrrole-Gold nanocomposites (PPy-Au NCs) by the chemical oxidative polymerization of pyrrole with ferric chloride as an oxidizing agent, in the presence of a colloidal suspension of gold nanoparticles. Gold nanoparticles (Au NPs) were synthesized by standard citrate reduction method. Au NPs and PPy-Au NCs were characterized by Transmission Electron Microscopy (TEM), Atomic Forced Microscopy (AFM), Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR) and X-ray diffraction (XRD) techniques for morphological and structural confirmations. The dc- electrical conductivity of PPy-Au NCs was tested by two probe method. The electrical conductivity of
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Au NPs were synthesized by chemical reduction method. The PPy-Au NCs were successfully synthesized by in-situ chemical oxidative polymerization of pyrrole in the presence of a colloidal suspension of Au NPs. The synthesized Au NPs and PPy-Au NCs were characterized by TEM, FEM. SEM, FTIR, and XRD. The electrical conductivity of PPy-Au NCs was studied by using two probe technique. These nanocomposites with good conductivity and excellent porosity have led to applications in highly sensitive and selective gas sensors at room temperatures, which will be reported in a separate …show more content…
1M pyrrole solution was prepared using distilled water and cooled in an ice bath (~ 0°C) with continuous stirring for 30 minutes. The precooled aqueous solution of FeCl3 (1M) was added dropwise to the pyrrole solution. The oxidant to monomer ratio was 1:1. The polymerization was carried out for 3h under constant stirring at ~ 0°C. This mixture was allowed to settle for 24h to ensure complete polymerization. The product obtained was filtered under reduced pressure. The product was washed with distilled water successively to remove the unreacted monomer, oxidant and dried under vacuum at room temperature to a constant
Au NPs were synthesized by chemical reduction method. The PPy-Au NCs were successfully synthesized by in-situ chemical oxidative polymerization of pyrrole in the presence of a colloidal suspension of Au NPs. The synthesized Au NPs and PPy-Au NCs were characterized by TEM, FEM. SEM, FTIR, and XRD. The electrical conductivity of PPy-Au NCs was studied by using two probe technique. These nanocomposites with good conductivity and excellent porosity have led to applications in highly sensitive and selective gas sensors at room temperatures, which will be reported in a separate …show more content…
1M pyrrole solution was prepared using distilled water and cooled in an ice bath (~ 0°C) with continuous stirring for 30 minutes. The precooled aqueous solution of FeCl3 (1M) was added dropwise to the pyrrole solution. The oxidant to monomer ratio was 1:1. The polymerization was carried out for 3h under constant stirring at ~ 0°C. This mixture was allowed to settle for 24h to ensure complete polymerization. The product obtained was filtered under reduced pressure. The product was washed with distilled water successively to remove the unreacted monomer, oxidant and dried under vacuum at room temperature to a constant