Issue 5, 2012
From the journal:

Journal of Materials Chemistry

Large-scale well-separated Ag nanosheet-assembled micro-hemispheres modified with HS-β-CD as effective SERS substrates for trace detection of PCBs†

Chuhong Zhu,a   Guowen Meng,*a   Qing Huang,*b   Zhongbo Li,a   Zhulin Huang,a   Meiling Wanga  and  Jingpeng Yuanc  

* Corresponding authors

a Key Laboratory of Materials Physics, Anhui Key Laboratory of Nanomaterials and Nanostructures, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, China
E-mail: gwmeng@issp.ac.cn

b Key Laboratory of Ion Beam Bioengineering, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China
E-mail: huangq@ipp.ac.cn

c Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, Department of Chemistry, Shandong University, Jinan, Shandong, PR China

Abstract

Large-scale well-separated Ag nanosheet-assembled micro-hemispheres with similar size and morphology were achieved on bare commercial ITO substrates via simple electrodeposition in a mixed aqueous solution of citric acid and AgNO3. It was found that appropriate electrodeposition current density and citric acid concentration are critical to the formation of well-separated nanosheet-assembled micro-hemispheres with similar size and morphology. The well-separated Ag nanosheet-assembled micro-hemispheres with similar size and morphology ensure the good surface-enhanced Raman scattering (SERS) signal reproducibility from different micro-hemispheres, and the sufficient sub-10 nm gaps on the nanosheet-assembled micro-hemispheres guarantee the high SERS sensitivity. By further modifying the Ag nanosheet-assembled micro-hemispheres with mono-6-thio-β-cyclodextrin (HS-β-CD), the SERS detection limit of 3,3′,4,4′-tetrachlorobiphenyl (PCB-77) can be further reduced, and two different polychlorinated biphenyl (PCB) congeners of 2-chlorobiphenyl (PCB-1) and PCB-77 in a mixed solution can be distinguished, indicating that the large-scale well-separated Ag nanosheet-assembled micro-hemispheres modified with HS-β-CD may have great potential as effective SERS substrates for rapid trace detection of PCBs.

Graphical abstract: Large-scale well-separated Ag nanosheet-assembled micro-hemispheres modified with HS-β-CD as effective SERS substrates for trace detection of PCBs

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Supplementary files

Article information

DOI
https://doi.org/10.1039/C2JM14823D
Article type
Paper
Submitted
27 Sep 2011
Accepted
22 Nov 2011
First published
15 Dec 2011

J. Mater. Chem., 2012,22, 2271-2278

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Large-scale well-separated Ag nanosheet-assembled micro-hemispheres modified with HS-β-CD as effective SERS substrates for trace detection of PCBs

C. Zhu, G. Meng, Q. Huang, Z. Li, Z. Huang, M. Wang and J. Yuan, J. Mater. Chem., 2012, 22, 2271 DOI: 10.1039/C2JM14823D

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