Structural, optical and impedance spectroscopy study of thin film of polyaniline (PANI/ZnO) nanocomposite

Abstract

Modern organic electronic and power electronic devices gained attention due their superior performance and efficiency with reduced cost. While nanocomposites of these organic semiconductors have high potential to further enhance these properties. In this work, thin films of zinc oxidepolyaniline (ZnO-PANI) nanocomposite with different compositions of ZnO (50, 60 and 70 wt%) are deposited by spin coater onto the surface of p-Si. The phase identification of the samples is identified through x-ray diffraction analysis. Pure ZnO showed wurtzite crystalline while PANI and nanocomposites of ZnO-PANI showed amorphous structure. The optical absorption band gap was evaluated from Ultraviolet-visible spectroscopy absorption studies and band gaps were calculated from Tauc's plots. The Ultraviolet-visible spectroscopy showed that by increasing ZnO content in the nanocomposite, the band gap increases from 3.25 eV to 3.3 eV and 3.4 eV for 50-50, 60-40 and 70-30 wt% respectively. The AC electrical properties of the nanocomposites were studied by using impedance spectroscopy. The parameters extracted from the impedance plots and conductivity values showed that 50-50 wt% is more conductive while that of 70%-30% wt is more resistive.

Dielectric Properties and Electrical Characteristics of a Triphenylamine Thin Film Deposited onto a Silicon Substrate via Spin Coating

“…However, as the voltage becomes positive, the impedance demonstrates an increasing trend correlated with the rise in voltage values, reaching a peak at 200 kHz. The Z ″ spectroscopic plot indicates a solitary relaxation event consistently occurring at a frequency of 200 kHz across all positive voltage values examined . Beyond this frequency, the impedance value decreases with the further increase in frequency.…”

Synthesis, electrical, and dielectric properties of novel polyaniline/strontium di‐nitrate composites

“…It can be concluded that with the addition of Sr(NO 3 ) 2 , the disorder and relaxation time in the PANI increases, hence the carriers either can find different pathways for transport or get trapped in the inhomogeneity in the sample. [ 51 ]…”

“…It can be concluded that with the addition of Sr(NO 3 ) 2 , the disorder and relaxation time in the PANI increases, hence the carriers either can find different pathways for transport or get trapped in the inhomogeneity in the sample. [51] The parameters shown in Table 1 indicate that the depressed or skewed semicircle is because of spatial inhomogeneities in the samples. The parameters α1 and α2 that represent surface and bulk components show variation in their values.…”

Investigating the Physicochemical and Optical Properties of PANI and PANI-ZnO Thin Films for an Efficient Ammonia Sensor at Ambient Conditions

“…XRD patterns of PANI-ZnO (10, 20, 30 wt.%) composites show higher crystallinity compared to PANI as the concentration of ZnO increases [30]. At the highest concentration of 30 wt.%, the diffraction pattern showed more peaks like ZnO, and the peaks shifted towards the lower angle side [31].…”