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Issue 11, 2012
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Flexible and mechanical strain resistant large area SERS active substrates

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Abstract

We report a cost effective and facile way to synthesize flexible, uniform, and large area surface enhanced Raman scattering (SERS) substrates using an oblique angle deposition (OAD) technique. The flexible SERS substrates consist of 1 μm long, tilted silver nanocolumnar films deposited on flexible polydimethylsiloxane (PDMS) and polyethylene terephthalate (PET) sheets using OAD. The SERS enhancement activity of these flexible substrates was determined using 10−5 M trans-1,2-bis(4-pyridyl) ethylene (BPE) Raman probe molecules. The in situ SERS measurements on these flexible substrates under mechanical (tensile/bending) strain conditions were performed. Our results show that flexible SERS substrates can withstand a tensile strain (ε) value as high as 30% without losing SERS performance, whereas the similar bending strain decreases the SERS performance by about 13%. A cyclic tensile loading test on flexible PDMS SERS substrates at a pre-specified tensile strain (ε) value of 10% shows that the SERS intensity remains almost constant for more than 100 cycles. These disposable and flexible SERS substrates can be integrated with biological substances and offer a novel and practical method to facilitate biosensing applications.

Graphical abstract: Flexible and mechanical strain resistant large area SERS active substrates

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Publication details

The article was received on 03 Jan 2012, accepted on 21 Mar 2012 and first published on 29 Mar 2012


Article type: Paper
DOI: 10.1039/C2NR00020B
Citation: Nanoscale, 2012,4, 3410-3414
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    Flexible and mechanical strain resistant large area SERS active substrates

    J. P. Singh, H. Chu, J. Abell, R. A. Tripp and Y. Zhao, Nanoscale, 2012, 4, 3410
    DOI: 10.1039/C2NR00020B

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