One-pot facile simultaneous in situ synthesis of conductive Ag-polyaniline composites using Keggin and Preyssler-type phosphotungstates

Abbas Amini; Marjan Rahimi; Marziyeh Nazari; Chun Cheng; Bijan Samali

doi:10.1039/c8ra09029g

One-pot facile simultaneous in situ synthesis of conductive Ag-polyaniline composites using Keggin and Preyssler-type phosphotungstates

RSC Adv. 2019 Jan 21;9(5):2772-2783. doi: 10.1039/c8ra09029g. eCollection 2019 Jan 18.

Authors

Abbas Amini^{1

2}, Marjan Rahimi³, Marziyeh Nazari⁴, Chun Cheng⁵, Bijan Samali¹

Affiliations

¹ Centre for Infrastructure Engineering, Western Sydney University, Kingswood Campus Bld Z, Locked Bag 1797 Penrith NSW 2751 Australia a.amini@westernsydney.edu.au a.amini@ack.edu.kw.
² Department of Mechanical Engineering, Australian College of Kuwait Mishref 13015 Kuwait.
³ Department of Chemistry, Mashhad Branch, Islamic Azad University Mashhad Iran.
⁴ Mathematics Department, Australian College of Kuwait Mishref Kuwait.
⁵ Department of Materials Science and Engineering, South University of Science and Technology Shenzhen China.

Abstract

Two heteropolytungstate structures, Keggin (H₃PW₁₂O₄₀) and Preyssler (H₁₄[NaP₅W₃₀O₁₁₀]), were used to synthesize conductive silver nanoparticle-polyaniline-heteropolytungstate (AgNPs-PAni-HPW) nanocomposites. During the oxidative polymerization of aniline, heteropolyblue was generated and served as the reducing agent to stabilize and distribute AgNPs within "PAni-Keggin" and "PAni-Preyssler" matrixes as well as on their surfaces. The prepared nanocomposites and AgNPs were characterized using UV-visible (UV-Vis) and Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), pore size distribution BET, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). UV-Vis results showed different stages of the formation of metal NPs embedded in the polymer-HPW composites, and FT-IR spectra presented characteristic bands of PAni, Keggin and Preyssler anions in the composites confirming no changes in their structures. The presence of AgNPs and an intensely crystalline matrix were confirmed by the XRD pattern. The BET surface areas were found to be 38.426 m² g^-1 for "AgNPs-PAni-Keggin" and 29.977 m² g^-1 for "AgNPs-PAni-Preyssler" nanocomposites with broad distributions of meso-porous structure for both nanocomposites. TEM and SEM images confirmed that the type of heteropolyacids affected the size of AgNPs. This is the first report that uses Keggin and Preyssler-type heteropolytungstate to synthesize "AgNPs-PAni-HPW" nanocomposites in an ambient condition through a low-cost, facile, one-pot, environmentally friendly and simultaneous in situ oxidative polymerization protocol.