期刊论文

Xu, Zhou;Cheng, Yunhui

英文

Coatings

2079-6412

2018

8

11

394-

10.3390/coatings8110394

applications. Supplementary Materials: The following are available online at http://www.mdpi.com/2079-6412/8/11/394/s1, Figure S1: The stability and life-time of the Au@Ag NPs probes; Figure S2: Statistical diameters of Au NP, Au@Ag Supplementary Materials: The following are available online at https://www.mdpi.com/xxx/s1, Figure S1: The stability and life-time of the Au@Ag NPs probes; Figure S2: Statistical diameters of Au NP, Au@Ag NP according Author Contributions: Conceptualization, Z.X. and Y.C..; Methodology, L.Z.; Investigation, L.Z. and Z.X.; Data Curation, J.T. and B.M.; Writing-Original Draft Preparation, B.M., L.Z. and R.W.; Writing-Review & Editing, Z.X. and M.C. Author Contributions: Conceptualization, Z.X. and Y.C..; Methodology, L.Z.; Investigation, L.Z. and Z.X.; Data Curation, J.T. and B.M.; Writing-Original Draft Preparation, B.M., L.Z. and R.W.; Writing-Review & Editing, Z.X. 31601550), the National Key Technology Support Program (No. 2016YFF0203701), and the Natural Science aFoundationnd M.C. of Hunan Province China (No. 2017JJ3150).

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A rapid surface-enhanced Raman scattering (SERS) method for Pb2+ detection has been developed based on l-cysteine-modified Ag-coated Au nanoparticles with core-shell nanostructure. Specifically, l-cysteine-functionalized Au@Ag core-shell probes bearing Raman-labeling molecules (4-ATP) are used to detect Pb2+ upon the formation of nanoparticle aggregates. The proposed SERS-based method shows a linear range between 5 pM and 10 nM, with an unprecedented limit of detection (LOD) of 1 pM for Pb2+; this LOD shows the method to be a few orders of magnitude more sensitive than the typical colorimetric...