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Colorimetric and SERS Dual-Mode Detection of Lead Ions Based on Au-Ag Core-Shell Nanospheres: Featuring Quick Screening With Ultra-High Sensitivity

Colorimetric and SERS Dual-Mode Detection of Lead Ions Based on Au-Ag Core-Shell Nanospheres: Featuring Quick Screening With Ultra-High Sensitivity

Zheng Zhang, Pei Ma, Junying Li, Yu Sun, Hao Shi, Nan Chen, Xuedian Zhang, Hui Chen

Opt Express. 2019 Sep 30;27(20):29248-29260.

PMID: 31684662

Abstract:

A novel strategy for colorimetric and surface-enhanced Raman scattering (SERS) dual-mode sensing of the lead ions (Pb2+) was established based on gluconate ion (Gluc) modified and 2-Naphthalenethiol (2-NT) tagged Au-Ag core-shell nanoparticles (NPs). Due to the complex formation between adsorbed Gluc and Pb2+, the addition of Pb2+ can induce the aggregation of Gluc/2-NT@Au@Ag NPs. Correspondingly, the aggregated Gluc/2-NT@Au@Ag NPs caused a significant difference in the color and SERS intensity. As a result, such Gluc/2-NT@Au@Ag NPs can achieve the sensing of Pb2+ using both colorimetric and SERS signals as the indicator, which features with wide response range from 10-11 to 10-5 M, rapid screening and high sensitivity (with a limit of detection (LOD) of 0.185 pM). Furthermore, such dual-mode sensor was demonstrated not to be responsive to other cations, and facilitate the sensing of real samples in practical environment. With rapid screening ability and outstanding sensitivity, we anticipate that this method would holding great potential for the applications in environmental monitoring.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP91601	2-Naphthalenethiol		91-60-1	Price

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