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Nano-morphology induced additional surface plasmon resonance enhancement of SERS sensitivity in Ag/GaN nanowall network

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dc.contributor.author Sharvani, S.
dc.contributor.author Upadhayaya, Kishor
dc.contributor.author Kumari, Gayatri
dc.contributor.author Narayana, Chandrabhas
dc.contributor.author Shivaprasad, S. M.
dc.date.accessioned 2016-10-18T04:48:45Z
dc.date.available 2016-10-18T04:48:45Z
dc.date.issued 2015
dc.identifier.citation Nanotechnology en_US
dc.identifier.citation 26 en_US
dc.identifier.citation 46 en_US
dc.identifier.citation Sharvani, S.; Upadhayaya, K.; Kumari, G.; Narayana, C.; Shivaprasad, S. M., Nano-morphology induced additional surface plasmon resonance enhancement of SERS sensitivity in Ag/GaN nanowall network. Nanotechnology 2015, 26 (46), 7. en_US
dc.identifier.issn 0957-4484
dc.identifier.uri https://libjncir.jncasr.ac.in/xmlui/10572/1880
dc.description Restricted access en_US
dc.description.abstract The GaN nanowall network, formed by opening the screw dislocations by kinetically controlled MBE growth, possesses a large surface and high conductivity. Sharp apexed nanowalls show higher surface electron concentration in the band-tail states, in comparison to blunt apexed nanowalls. Uncapped silver nanoparticles are vapor deposited on the blunt and sharp GaN nanowall networks to study the morphological dependence of band-edge plasmon-coupling. Surface enhanced Raman spectroscopy studies performed with a rhodamine 6G analyte on these two configurations clearly show that the sharp nanowall morphology with smaller Ag nanoparticles shows higher enhancement of the Raman signal. A very large enhancement factor of 2.8 x 10(7) and a very low limit of detection of 10(-10) M is observed, which is attributed to the surface plasmon resonance owing to the high surface electron concentration on the GaN nanowall in addition to that of the Ag nanoparticles. The significantly higher sensitivity with same-sized Ag nanoparticles confirms the unconventional role of morphology-dependent surface charge carrier concentration of GaN nanowalls in the enhancement of Raman signals. en_US
dc.description.uri 1361-6528 en_US
dc.description.uri http://dx.doi.org/10.1088/0957-4484/26/46/465701 en_US
dc.language English en
dc.language.iso English en_US
dc.publisher IOP Publishing Ltd en_US
dc.rights ?IOP Publishing Ltd, 2015 en_US
dc.subject Nanoscience & Nanotechnology en_US
dc.subject Materials Science en_US
dc.subject Applied Physics en_US
dc.subject GaN en_US
dc.subject SERS en_US
dc.subject Ag nanoparticles en_US
dc.subject Raman-Spectroscopy en_US
dc.subject Nanoparticles en_US
dc.subject Scattering en_US
dc.subject Shape en_US
dc.subject Size en_US
dc.subject Absorption en_US
dc.subject Substrate en_US
dc.subject Films en_US
dc.title Nano-morphology induced additional surface plasmon resonance enhancement of SERS sensitivity in Ag/GaN nanowall network en_US
dc.type Article en_US


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