A Sensitive and Selective Method for Visual Chronometric Detection of Copper(II) Ions Using Clock Reaction

Abstract

Recently, the clock reaction of methylene blue (MB) and hydrazine (N2H4) has been receiving more and more attention.

Direct Blue Light-Induced Autocatalytic Oxidation of o-Phenylenediamine for Highly Sensitive Visual Detection of Triaminotrinitrobenzene

“…Visual colorimetric assays gain increasing attention in recent years thanks to their cost-effectiveness, portability, and simplicity. − The analysis results can be conveniently visualized according to the anlayte-induced color change. These outstanding features make them very desirable for the detection of various analytes. − The key component in colorimetric assays is how to efficiently transform the analyte concentration into visual color change that is directly observed with naked eye. Accordingly, great efforts have been made to develop chromogenic systems for colorimetric methods.…”

Molybdenum Oxide Nanosheet-Supported Ferrous Ion Artificial Peroxidase for Visual Colorimetric Detection of Triacetone Triperoxide

“…Nanomaterial-based mimetic enzymes (called as nanozymes) have drawn great attention thanks to their low cost, simple preparation process, and good stability. − Ever since the first report of Fe 3 O 4 as artificial peroxidase by Yan’s group, a series of nanomaterials containing carbon nanomaterials, metal, and metal oxide nanoparticles have been found to mimic natural enzymes, such as peroxidase, catalase, superoxide dismutase, nitrate reductase, esterase, phosphatase, urease, and silicatein. ,− These nanozymes have been utilized for sensing, imaging, theranostics, and molecular computing. − Despite these achievements, the catalytic activity of traditional nanozymes is highly dependent on their structure, size, morphology, and surface composition. − The nanozymes usually include a mixture of nanoparticles with various morphologies. Only small fraction of nanoparticles contributes to the enzyme activity.…”