Work

A Simple and Fast Colorimetric Assay for the Detection of Chloride Ions Based on Etching of Silver Triangular Nanoplates

Year: 2026

Type: article

Abstract: High Resolution Image Download MS PowerPoint Slide It is of essential importance to precisely detect chloride ions (Cl – ) for environmental monitoring and protection. However, major challenges still remain for reliable, simple, and rapid detection of Cl – . Herein, we present a simple and rapid colorimetric method for detecting Cl – by utilizing unmodified silver triangular nanoplates (AgNPrs) as the colorimetric agent. The detection principle is based on the Cl – -induced etching of AgNPrs into round nanodisks, resulting in a blue shift in the absorption peak and an observable color transition from blue to yellow. A good linear relationship between Cl – concentration and the peak blue shift of absorption spectra is achieved in the range of 140–220 μM, with a naked-eye detection limit of 96 μM. Due to its superior sensitivity and selectivity, the proposed colorimetric sensor is successfully applied for discriminating Cl – from real water samples. Besides, the colorimetric assay is a valid method for investigating binding sites and the change of Gibbs free energy (Δ G ) during the Cl – -induced etching process of AgNPrs.

Source: ACS Omega

DOI: 10.1021/acsomega.5c12694

Authors: Ning Feng, Xiaodie Han, Anran Wang, Lixia LI, Yufang Liu

Institutions: Henan Normal University, Henan Academy of Sciences

Language: English

Topic: Gold and Silver Nanoparticles Synthesis and Applications

Subfield: Electronic, Optical and Magnetic Materials

Field: Materials Science

Domain: Physical Sciences

SDG: Clean water and sanitation

Open Access status: gold

Estimated APC paid: $1,935