Synergistically Enhanced Oxidase-like Property of Core–Shell MOF Nanozymes by Decorating Au and Ag/AgCl Nanoparticles for <scp>l</scp>-Cysteine Colorimetric Sensing
Haoran Li, Daqing Chen, Wen Zhou, Donghao Cheng, Danhua Ge, Xiaojun Chen
Abstract
Monitoring l -cysteine ( l -Cys) is of importance for human health and food safety. Herein, we designed a novel strategy for bimetallic Au and Ag/AgCl anchoring on Ni-doped ZIF-67 to form core–shell nanocubes (Ni-ZIF-67/AuAg/AgCl) using the galvanic replacement processes. The unique properties of ZIF-67 nanocubes were conducive to generating strong synergistic catalytic effects with Au and Ag/AgCl, particularly when Ni-ZIF-67/AuAg/AgCl composites were employed as oxidase mimics for catalyzing the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB). The Ni-ZIF-67/AuAg/AgCl composites displayed strong affinity toward TMB, displaying a lower Michaelis constant K m value of 0.25 mM and a higher maximum initial rate V max of 9 × 10 –8 M s –1 . By virtue of the nanozyme, the colorimetric sensor was constructed for l -Cys detection with a relatively low detection limit of 0.051 μM. The superior catalytic performance of the as-prepared Ni-ZIF-67/AuAg/AgCl composites can be ascribed to the core–shell structure, large specific surface area, and strong synergistic catalytic effects, which are beneficial for exposing more active sites and enhancing the conductivity to further boost their catalytic activity.