Please use this identifier to cite or link to this item: http://lib.jncasr.ac.in:8080/jspui/handle/10572/1872
Title: Size and distribution control of surface plasmon enhanced photoluminescence and SERS signal in Ag-GaN hybrid systems
Authors: Thakur, Varun
Siddhanta, Soumik
Narayana, Chandrabhas
Shivaprasad, S. M.
Keywords: Chemistry
Raman-Spectroscopy
Nanowall Network
Scattering
Substrate
Proteins
Luminescence
Nanowires
Molecules
Resonance
Issue Date: 2015
Publisher: Royal Society of Chemistry
Citation: RSC Advances
5
129
Thakur, V.; Siddhanta, S.; Narayana, C.; Shivaprasad, S. M., Size and distribution control of surface plasmon enhanced photoluminescence and SERS signal in Ag-GaN hybrid systems. RSC Advances 2015, 5 (129), 106832-106837.
Abstract: In the present experiment, two GaN nanowall network (NWN) samples with different porosity were grown on c-sapphire substrates using plasma assisted molecular beam epitaxy (PA-MBE). Ag nanoparticles were deposited on both the samples using a physical vapour deposition (PVD) system. Annealing the samples at different temperatures resulted in a change in Ag nanoparticle size due to diffusion and Ostwald ripening which had significant effect on the photoluminescence and SERS activity of GaN NWN. It was observed that the photoluminescence yield increased by more than five times in both cases at 200 degrees C. The SERS activity for thiophenol is higher in the as-deposited case for the sample with higher porosity, but after annealing to 200 degrees C the activity increased for the sample with lower porosity. It is also interesting to observe that the sample with higher porosity shows SERS signals even after being annealed to higher temperatures. Studies are also done for other analytes such as R6G and BSA. The results are discussed in terms of plasmonic effects of Ag nanoparticles on the excitonic emission from the GaN surface, which is also simulated using 2D-FDTD simulations.
Description: Restricted access
URI: http://hdl.handle.net/10572/1872
ISSN: 2046-2069
Appears in Collections:Research Articles (Chandrabhas N.)

Files in This Item:
File Description SizeFormat 
50.pdf1.59 MBAdobe PDFView/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.