Chonemorpha grandiflora extract mediated synthesis of Ag-ZnO nanoparticles for its anticancer, electrical and dielectric applications

Abstract

A phytosynthesis method is a nontoxic and environmentally friendly approach. We successfully synthesized the spherical Ag-ZnO nanoparticles via phytosynthesis method using Chonemorpha grandiflora leaf extract. The Scherrer’s equation revealed the average crystallite size in the range of 20–35 nm which is in good agreement with TEM results. Adsorption peak was found at 380 nm using Diffused reflectance spectra and energy band gap is found to be 3.08–3.18 eV using Kubelka-Munk function. In vitro viability studies on MCF 7, HCT 116 and A 549 cell lines showed dose-dependent toxicity. Dielectric applications were investigated in the frequency range from 100 Hz to 8 MHz at room temperature using LCR meter. The dielectric parameters of Ag-ZnO nanoparticles increased with Ag concentration and decrease with frequency. This behavior may be due to the decrease in the concentration of Ag in ZnO host material. Further, there is an increase in AC electrical conductivity with adding Ag concentration and at higher frequencies which is due to the increase of available charge carriers. The DC conductivity of samples increases from 2.6 × 10−5 S m−1 to 2 × 10−4 S m−1 with the increasing Ag content and is highest for 0.1 content.