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Title: Surface-enhanced Raman scattering activity of niobium surface after irradiation with femtosecond laser pulses

The chemical modification of the niobium (Nb) surface after irradiation with femtosecond laser pulses was investigated by scanning electron microscopy coupled with energy dispersive spectroscopy, atomic force microscopy, grazing incidence X-ray diffraction, and micro-Raman spectroscopy. The physical-chemical analyses indicated that the laser treatment results in oxidation of the Nb surface, as well as in the formation of Nb hydrides. Remarkably, after the samples' washing in ethanol, a strong Surface-Enhanced Raman Scattering (SERS) signal originating from the toluene residual traces was evidenced. Further, it was observed that the laser irradiated Nb surface is able to provide a SERS enhancement of ∼1.3 × 10{sup 3} times for rhodamine 6G solutions. Thus, for the first time it was shown that Nb/Nb oxide surfaces could exhibit SERS functionality, and so one can expect applications in biological/biochemical screening or for sensing of dangerous environmental substances.
Authors:
 [1] ;  [2] ;  [3] ; ;  [4] ; ; ; ; ; ; ;  [5]
  1. Faculty of Physics, Sofia University, 5 James Bourchier Blvd., 1164 Sofia (Bulgaria)
  2. (Bulgaria)
  3. Georgi Nadjakov Institute of Solid State Physics, BAS, 72 Tzarigradsko Chaussee, 1784 Sofia (Bulgaria)
  4. National Institute of Material Physics, 105 bis Atomistilor Street, 077125 Magurele-Ilfov (Romania)
  5. National Institute for Lasers, Plasma and Radiation Physics, 409 Atomistilor Street, 077125 Magurele-Ilfov (Romania)
Publication Date:
OSTI Identifier:
22492960
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 118; Journal Issue: 20; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ATOMIC FORCE MICROSCOPY; CHEMICAL ANALYSIS; ETHANOL; INCIDENCE ANGLE; IRRADIATION; LASER RADIATION; NIOBIUM; NIOBIUM OXIDES; OXIDATION; PULSES; RAMAN EFFECT; RAMAN SPECTROSCOPY; SCANNING ELECTRON MICROSCOPY; SURFACES; TOLUENE; X-RAY DIFFRACTION