Large‐area Ag nanorod array substrates for SERS: AAO template‐assisted fabrication, functionalization, and application in detection PCBs. (14th October 2012)

• Record Type: Journal Article
• Authors: Huang, Zhulin; Meng, Guowen; Huang, Qing; Chen, Bin; Zhu, Chuhong; Zhang, Zhuo
• Is Part Of: Journal of Raman spectroscopy. Volume 44:Number 2(2013:Feb.)
• Page Start: 240
• Page End: 246
• Publication Date: 2012-10-14
• Subjects: Raman spectroscopy -- Periodicals; 535.846
• DOI: 10.1002/jrs.4184
• Languages: English
• ISSNs: 0377-0486

Abstract

<abstract abstract-type="main"> <title> <x xml:space="preserve">Abstract</x> </title> <p>Highly ordered arrays of thiolated <italic>β</italic>‐cyclodextrin (HS‐<italic>β</italic>‐CD) functionalized Ag‐nanorods (Ag‐NRs) with plasmonic antennae enhancement of electrical field have been achieved for encapsulation and rapid detection of polychlorinated biphenyls (PCBs). The large‐area ordered arrays of rigid Ag‐NRs supported on copper base were fabricated via porous anodic aluminum oxide (AAO) template‐assisted electrochemical deposition. The inter‐nanorod gaps between the neighboring Ag‐NRs were tuned to sub‐10 nm by thinning the pore‐wall thickness of the AAO template using diluted H₃PO₄. The nearly perfect large‐area ordered arrays of Ag‐NRs supported on copper base render these systems excellent in surface‐enhanced Raman scattering (SERS) performance with uniform electric field enhancement, as testified by the SERS spectra and Raman mappings of rhodamine 6 G. Furthermore, the Ag‐NRs were functionalized with HS‐<italic>β</italic>‐CD molecules so as to capture the apolar PCB molecules in the hydrophobic cavity of the CD. Compared to the ordinary undecorated SERS substrates, the HS‐<italic>β</italic>‐CD modified Ag‐NR arrays exhibit better capture ability and higher sensitivity in rapid detection of PCBs. Copyright © 2012 John Wiley &amp; Sons, Ltd.</p> </abstract>