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Issue 31, 2013
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Galvanic replacement approach for bifunctional polyacrylonitrile/Ag–M (M = Au or Pd) nanofibers as SERS-active substrates for monitoring catalytic reactions

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Abstract

SERS has been applied to monitor different types of catalytic reactions on the surface of metal NPs in recent years, which requires bifunctional metal structures with plasmonic properties as well as catalytic activity. Monitoring catalytic reactions with SERS technology in previous reports was usually performed in metal solution, using metal electrodes or on a glass/silica substrate with an immobilized metal. Here, we report a general approach for preparing novel SERS-active substrates which are used to monitor catalytic reactions. The polyacrylonitrile (PAN)/Ag–M (M = Au or Pd) bimetallic nanofibrous mats are prepared through galvanic replacement reactions of Ag with Au or Pd on the surface of electrospun PAN/Ag nanofibers. The composition of Ag and Au or Pd could be tuned by changing the concentration of the metal solution used for replacement. The PAN/Ag0.60Au0.40 and PAN/Ag0.90Pd0.10 bimetallic nanofibrous mats exhibit both excellent SERS and catalytic activities. The reduction of 4-nitrothiophenol (4-NTP) to the corresponding to 4-aminothiophenol (4-ATP) on PAN/Ag0.60Au0.40 and PAN/Ag0.90Pd0.10 bimetallic nanofibrous mats are monitored by SERS technology. The SERS signals of the reaction intermediate, 4,4′-dimercapto-azobenzene(4,4′-DMAB), are observed as the reaction proceeds with time.

Graphical abstract: Galvanic replacement approach for bifunctional polyacrylonitrile/Ag–M (M = Au or Pd) nanofibers as SERS-active substrates for monitoring catalytic reactions

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Supplementary files

Article information


Submitted
10 Apr 2013
Accepted
16 May 2013
First published
16 May 2013

J. Mater. Chem. A, 2013,1, 8942-8949
Article type
Paper

Galvanic replacement approach for bifunctional polyacrylonitrile/Ag–M (M = Au or Pd) nanofibers as SERS-active substrates for monitoring catalytic reactions

M. Cao, L. Zhou, X. Xu, S. Cheng, J. Yao and L. Fan, J. Mater. Chem. A, 2013, 1, 8942
DOI: 10.1039/C3TA11435J

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