Synthesis and Electrical Properties of Polyaniline Composite with Silver Nanoparticles

Abstract

Polyaniline/silver (PANI/Ag) nanocomposite was prepared by chemical oxidative polymerization of aniline monomer in the presence of nitric acid. The formation of PANI/Ag nanocomposite was characterized by XRD, FTIR, TEM, UV-vis spectroscopy. The XRD patterns indicated that the crystalline phase of Ag is cubic with crystallite size of 93 nm. The TEM image shows that the Ag nanoparticles are well dispersed in the polyaniline matrix. Optical measurements show that the value of optical band gap of nanocomposite is lower than that of pure PANI. The DC-, AC-conductivities, dielectric permittivity (ε') and dielectric loss (ε'') of (PANI/Ag) nanocomposite and pure PANI have been measured in the temperature range from 303 to 723 K and frequency range from 10 to 10<sup>3</sup> kHz. The electrical conductivity of the (PANI/Ag) nanocomposite is higher than pure PANI. Temperature variation of frequency exponents in this blend suggests that AC-conductivity is attributed to correlated barrier hopping mechanism. At all frequencies, the ε' value for (PANI/Ag) nanocomposite is higher than that for pure one. The higher dielectric constant of the PANI/Ag nanocomposite indicates their better ability to store electric potential energy under the influence of alternative electric field

Exploring PANI-TiN Nanoparticle Coatings in a PEFC Environment: Enhancing Corrosion Resistance and Conductivity of Stainless Steel Bipolar Plates

“…As observed, for all the coatings, the ICR values were significantly affected by the number of coating cycles and especially for PANI coatings wherein the ICR seemed to be almost linearly dependant on the number of CV cycles for up to 20 coating cycles. As mentioned earlier, the expected increase in the ICR for PANI coated samples was due to the relatively low electrical conductivity of thicker PANI films as opposed to metals [36]. …”

Synthesis and optical characterization of acid-doped polyaniline thin films

“…They combine the electrical properties of metals with the advantage of polymers such as smaller weight, greater workability, resistance to corrosion and lower cost [1] hence can be regarded as suitable candidates for the replacement of metals [2]. Polyaniline PANI is one of the most useful of these polymers due to its easy synthesis, good environmental stability, reversible electrical properties and low cost of monomer [3,4]. Its high absorption coefficient in the visible part of the electromagnetic spectrum, high mobility of charge carriers and great stability has made it very attractive to scientific researchers [1].…”

Immobilization of Glucose Oxidase on Modified-Carbon-Paste-Electrodes for Microfuel Cell

“…This result indicated that the modification of carbon paste with nanofiber-polyaniline (110-120 nm) was effective in increasing the electroconductivity of the electrodes. The electroconductive property of polyaniline is caused by protonation in strong acid media when oxidative polymerization occurs [13]. The nano-size and fiber form of the polyaniline particle also influence its electroconductiveness because they contributed to a larger surface area of the electrodes [14].…”