Synthesis and characterization of polyaniline derivative and silver nanoparticle composites

Abstract

BACKGROUND: There has been a recent surge of interest in the synthesis and applications of electroactive polymers with incorporated metal nanoparticles. These hybrid systems are expected to display synergistic properties between the conjugated polymers and the metal nanoparticles, making them potential candidates for applications in sensors and electronic devices. RESULTS:Composites of polyaniline derivatives -polyaniline, poly(2,5-dimethoxyaniline) and poly(aniline-2,5dimethoxyaniline) -and silver nanoparticles were prepared through simultaneous polymerization of aniline derivative and reduction of AgNO 3 in the presence of poly(styrene sulfonic acid) (PSS). We used AgNO 3 as one of the initial components (1) to form the silver nanoparticles and (2) as an oxidizing agent for initiation of the polymerization reaction. UV-visible spectra of the synthesized nanocomposites reveal the synchronized formation of silver nanoparticles and polymer matrix. The morphology of the silver nanoparticles and degree of their dispersion in the nanocomposites were characterized by transmission electron microscopy. Thermogravimetric analysis and differential scanning calorimetry results indicate an enhancement of the thermal stability of the nanocomposites compared to the pure polymers. The electrical conductivity of the nanocomposites is in the range 10 −4 to 10 −2 S cm −1 .CONCLUSION: A single-step process for the synthesis of silver nanoparticle-polyaniline derivative nanocomposites doped with PSS has been demonstrated. The approach in which silver nanoparticles are formed simultaneously during the polymerization process results in a good dispersion of the nanoparticles in the conductive polymer matrix.

Synthesis of Poly (2,5-dimethoxyaniline) and Electrochromic Properties

“…The weight loss at ̴ 280 °C was the decomposition of the dopant anion (oxalate anion). Finally, the decomposition temperature of PDMA backbone was at ̴ 400 °C 40,41 . These results confirm the successful polymerization of the doped-PDMA.…”

Metallic‐Based Nanocomposites of Conductive Polymers

“…In a few cases materials properties such as electrical conductivity and thermal stability have been explored and compared to those of the corresponding pristine polymer materials. For instance, in the case of Ag-PANI-PSS and Ag-PDMA-PSS nanocomposites, an improved thermal stability has been established [40]. Concerning the electrical conductivity, there are differing data showing increased [15,23,27,43] or preserved [20,40] conductivity of the composites in comparison with the corresponding pristine polymers, synthesized under identical conditions.…”

Influence of Binary Oxidant (FeCl<sub>3</sub>:APS) Ratio on the Spectroscopic and Microscopic Properties of Poly(2,5-Dimethoxyaniline)

“…The second endothermic peak has been observed in the temperature region 150˚C - 300˚C of the thermogram. The change in energy in this region is associated with the morphological changes [25,26] taking place due to melting of the polymer. This indicates that the peaks are centered around glass transition temperature (T g ) which is ~207˚C, 275˚C, and 180˚C for samples PDMA1, PDMA3 and PDMA5, respectively.…”