Development of enhanced electrochemical sensor and antimicrobial studies of ZnO NPs synthesized using green plant extract

Abstract

The present investigation envisages for plant mediated synthesis of ZnO NPs (ZNPs) by green combustion route using eco-friendly LCL (Lantana Camara Leaf) Extract. The optical and structural characterizations of ZNPs was studied by spectral techniques; PXRD (Powder X-ray diffraction) study confirms the phase formation and crystalline nature of NPs with its average particle size found to be 35 ​nm The internal morphology of synthesized NPs comprises noticeable pores, voids and agglomeration obtained by SEM (Scanning Electron Microscopy) technique. TGA-DTA (Thermogravimetric-Differential Thermal Analysis) analysis reveals the changes in physico-chemical properties of ZNPs by the effect of temperature. The electrochemical reaction measurements of ZNPs-graphite paste electrode in a 3-electrode system using 1 ​M HCl solution was conducted by CV (Cyclic Voltametric) and EIS (Electrochemical Impedance Spectroscopy) techniques in the different scan rates 0.01–0.05 ​V/s. Further, the corrosion inhibition activities of ZNPs were examined on mild steel (MS) in 1 ​M HCl solution by electrochemical spectral studies (CV & EIS) and potentiodynamic polarization (PDP) measurements. The antimicrobial potential of ZNPs was discussed in detail in contrast to gram positive (Micrococcus luteus) and gram negative (P.auruginosa) bacterial strains by the zone of inhibition concept using disc diffusion technique.