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Hydrophobic mediated growth of galvanic-nanobuds from germanium nanowires for a highly tunable SERS substrate

Abstract

Potential application of SERS substrates lie in their ability of being large area and reproducible with high shelf life. Sensitivity, however, is a consequence of tunability of the substrate for the specific laser in use. These criteria are addressed by the reported SERS substrate with galvanic-nanobud architecture through germanium nanowires. Dense germanium nanowires have been fabricated using plasma enhanced chemical vapour deposition technique. Silver nanostructures were grown on the nanowires by hydrophobic interaction between the nanowire substrate and AgNO3 solution. A measurement method has been proposed to obtain the temporal information on nanobud formation, thereby optimizing the surface enhanced Raman scattered signal from such substrates in real-time for any wavelength. This eliminates the usage of computationally expensive numerical tools or additional characterization techniques to locate plasmon resonance of the substrates. The proposed optimization technique was further verified by cathodoluminescence measurements. Cathodoluminescence hotspot maps revealed the nature of the hotspots for the substrates optimized for 514 nm and 785 nm. Enhanced sensitivity and tunability of the substrates in the red spectral region present plausible future application in biological domain.

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Publication details

The article was received on 08 Oct 2018, accepted on 02 Nov 2018 and first published on 03 Nov 2018


Article type: Paper
DOI: 10.1039/C8NJ05106B
Citation: New J. Chem., 2018, Accepted Manuscript
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    Hydrophobic mediated growth of galvanic-nanobuds from germanium nanowires for a highly tunable SERS substrate

    D. R. Nayak, N. Bhat and S. Umapathy, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ05106B

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