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Sensors (Basel). 2018 Aug 30;18(9). pii: E2862. doi: 10.3390/s18092862.

Preparation of Quasi-Three-Dimensional Porous Ag and Ag-NiO Nanofibrous Mats for SERS Application.

Wu H1,2, Sun X3, Hou C4, Hou J5, Lei Y6,7.

Author information

1
Key Laboratory for Biorheological Science and Technology of Ministry of Education, State and Local Joint Engineering Laboratory for Vascular Implants, Bioengineering College of Chongqing University, Chongqing 400044, China. huixiang.wu@uconn.edu.
2
Department of Chemical and Biomolecular Engineering, University of Connecticut, Storrs, CT 06269, USA. huixiang.wu@uconn.edu.
3
Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853, USA. xs266@cornell.edu.
4
Key Laboratory for Biorheological Science and Technology of Ministry of Education, State and Local Joint Engineering Laboratory for Vascular Implants, Bioengineering College of Chongqing University, Chongqing 400044, China. houcj@cqu.edu.cn.
5
Liquor Making Biology Technology and Application of Key Laboratory of Sichuan Province, College of Bioengineering, Sichuan University of Science and Engineering, Zigong 643000, China. 20161701001@cqu.edu.cn.
6
Department of Chemical and Biomolecular Engineering, University of Connecticut, Storrs, CT 06269, USA. yu.lei@uconn.edu.
7
Department of Biomedical Engineering, University of Connecticut, Storrs, CT 06269, USA. yu.lei@uconn.edu.

Abstract

In this study, two new quasi-three-dimensional Surface Enhanced Raman Scattering (SERS) substrates, namely porous Ag and Ag-NiO nanofibrous mats, were prepared using a simple, electrospinning-calcination, two-step synthetic process. AgNO₃/polyvinyl pyrrolidone (PVP) and AgNO₃/Ni(NO₃)₂/PVP composites serving as precursors were electrospun to form corresponding precursory nanofibers. Porous Ag and Ag-NiO nanofibers were successfully obtained after a 3-h calcination at 500 °C under air atmosphere, and analyzed using various material characterization techniques. Synthesized, quasi-three-dimensional porous Ag and Ag-NiO nanofibrous mats were applied as SERS substrates, to measure the model compound Rhodamine 6G (R6G), and investigate the corresponding signal enhancement. Furthermore, porous Ag and Ag-NiO nanofibrous mats were employed as SERS substrates for melamine and methyl parathion respectively. Sensitive detection of melamine and methyl parathion was achieved, indicating their feasibility as an active SERS sensing platform, and potential for food safety and environmental monitoring. All the results suggest that the electrospinning-calcination, two-step method offers a new, low cost, high performance solution in the preparation of SERS substrates.

KEYWORDS:

electrospinning; melamine; methyl parathion; nanofiber; silver; surface enhanced Raman scattering

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