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Issue 3, 2017
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SERS-enhanced piezoplasmonic graphene composite for biological and structural strain mapping

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Abstract

Thin-film optical strain sensors have the ability to map small deformations with spatial and temporal resolution and do not require electrical interrogation. This paper describes the use of graphene decorated with metallic nanoislands for sensing of tensile deformations of less than 0.04% with a resolution of less than 0.002%. The nanoisland-graphene composite films contain gaps between the nanoislands, which when functionalized with benzenethiolate behave as hot spots for surface-enhanced Raman scattering (SERS). Mechanical strain increases the sizes of the gaps; this increase attenuates the electric field, and thus attenuates the SERS signal. This compounded, SERS-enhanced “piezoplasmonic” effect can be quantified using a plasmonic gauge factor, and is among the most sensitive mechanical sensors of any type. Since the graphene-nanoisland films are both conductive and optically active, they permit simultaneous electrical stimulation of myoblast cells and optical detection of the strains produced by the cellular contractions.

Graphical abstract: SERS-enhanced piezoplasmonic graphene composite for biological and structural strain mapping

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Publication details

The article was received on 19 Nov 2016, accepted on 21 Dec 2016 and first published on 22 Dec 2016


Article type: Paper
DOI: 10.1039/C6NR09005B
Citation: Nanoscale, 2017,9, 1292-1298
  • Open access: Creative Commons BY license
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    SERS-enhanced piezoplasmonic graphene composite for biological and structural strain mapping

    B. C. Marin, J. Liu, E. Aklile, A. D. Urbina, A. S.-C. Chiang, N. Lawrence, S. Chen and D. J. Lipomi, Nanoscale, 2017, 9, 1292
    DOI: 10.1039/C6NR09005B

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