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Issue 11, 2012
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Functional hybrid nickel nanostructures as recyclable SERS substrates: detection of explosives and biowarfare agents

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Abstract

We present the synthesis of highly anisotropic nickel nanowires (NWs) and large area, free-standing carpets extending over cm2 area by simple solution phase chemistry. The materials can be post-synthetically manipulated to produce hybrid tubes, wires, and carpets by galvanic exchange reactions with Au3+, Ag+, Pt2+, and Pd2+. All of these structures, especially the hybrid carpets and tubes, have been prepared in bulk and are surface enhanced Raman scattering (SERS) active substrates. Molecules of relevance such as dipicolinic acid (constituting 5–15% of the dry weight of bacterial spores of Bacillus anthracis), dinitrotoluene, hexahydro-1,3,5-triazine (RDX), and trinitrotoluene at nanomolar concentrations have been detected. An enhancement factor of ∼1010 was observed for the Ni–Au nanocarpet. The reusability of the Ni–Au nanocarpet for SERS applications was tested 5 times without affecting the sensitivity. The reusability and sensitivity over large area have been demonstrated by Raman microscopy. Our method provides an easy and cost effective way to produce recyclable, large area, SERS active substrates with high sensitivity and reproducibility which can overcome the limitation of one-time use of traditional SERS substrates.

Graphical abstract: Functional hybrid nickel nanostructures as recyclable SERS substrates: detection of explosives and biowarfare agents

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Publication details

The article was received on 07 Mar 2012, accepted on 14 Mar 2012 and first published on 19 Mar 2012


Article type: Paper
DOI: 10.1039/C2NR30557G
Nanoscale, 2012,4, 3427-3437

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    Functional hybrid nickel nanostructures as recyclable SERS substrates: detection of explosives and biowarfare agents

    P. R. Sajanlal and T. Pradeep, Nanoscale, 2012, 4, 3427
    DOI: 10.1039/C2NR30557G

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