Colorimetric sensing of lead ion using gold nanorod with enhanced sensitivity via catalytic etching

Author:

Wang Suyan1,Sun Jingbo1,Cao Jiafeng2,Lu Kun2,Xu Dong1ORCID

Affiliation:

1. National Engineering Laboratory for Rice and By‐products Further Processing Central South University of Forestry & Technology Changsha China

2. College of Food Science and Engineering Central South University of Forestry & Technology Changsha China

Abstract

AbstractLead, a prevalent heavy metal, poses significant risks to human health through various exposure pathways. Herein, we propose an extremely sensitive assay toward lead ion (Pb2+) using gold nanorods (GNRs) as probes based on its catalytic activity on etching gold in the presence of 2‐mercaptoethanol and sodium thiosulfate. In the presence of Pb2+, etching predominantly occurs at the two ends of GNRs, leading to the reduction of aspect ratio and the corresponding blueshift of the localized surface plasmon resonance (LSPR). With increasing Pb2+ concentration over the range of 0–50 μM, the color of GNR solution lightens, ultimately becoming colorless. The wavelength shift (Δλ) of LSPR is highly dependent on Pb2+ concentration, with a linear regression equation of Δλ = 10.05ln[Pb2+] + 9.59 and an R2 = 0.995. The assay demonstrates high selectivity for Pb2+ over other potentially interfering ions such as Cu2+ because of its special catalytic activity in the etching of GNRs and the complexing ability of 2‐mercaptoethanol and sodium thiosulfate. Validation of the assay was accomplished by analyzing several forest‐derived food samples, affirming the accuracy in real‐world scenarios. The assay we developed holds promise for many applications in environmental protection and food safety.

Funder

National Natural Science Foundation of China

Publisher

Wiley

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