A sustainable approach for graphene-oxide surface decoration using Oxalis corniculata leaf extract-derived silver nanoparticles: their antibacterial activities and electrochemical sensing

摘要

In this work, a facile green synthesis usingOxalis corniculataleaf extract (OCLE) as a biodegradable reducing and capping/stabilizing agent was carried out for the construction ofOxalis corniculataleaf extract-derived silver nanoparticles (OCLE-AgNPs). Moreover, OCLE-AgNP Delta GO nanocomposites were fashioned simply by mixing a GO suspension and supernatant OCLE-AgNPsviaa one-pot environmentally benign method. The AgNP Delta GO nanocomposites are biocompatible materials for potential applications such as antibacterial activities against two different types of bacterial cells, namely Gram-positiveBacillus subtilisand Gram-negativeEscherichia coliand selective electrochemical sensing to itraconazole (ITRA) at the fabricated GCE (AgNP Delta GO@GCE). AgNP Delta GO@GCE sensors gave excellent outcomes for ITRA as higher current response over the bare GCE. Under optimized conditions, the oxidation peak current of ITRA varied linearly with a wide range of the concentration between 26.7 mu M and 103.8 mu M with a correlation coefficient of 0.997 and a detection limit of 0.1276 mu M, for differential pulse anodic stripping voltammetric (DP-ASV) technique. In addition, the possible mechanism for the ITRA oxidation was further verified and explained by single-electron transfer (SET) and proton removal mechanism steps. The developed sensor exhibited good repeatability, reproducibility, and stability. The use of environmentally benign and renewable plant material offers enormous benefits of eco-friendliness applicability.