Micro-Raman study of nanocomposite porous films with silver nanoparticles prepared using pulsed laser deposition

Abstract

Abstract. Nanocomposite porous films with silver nanoparticle (Ag NP) arrays were prepared by the pulsed laser deposition from the back flux of erosion torch particles in argon atmosphere on the substrate placed at the target plane. Preparation conditions of the films were set by argon pressure, energy density of laser pulses, their amount and substrate position relatively to the torch axis. The films were prepared with gradient thickness, variable Ag NP sizes and distance between them along the length of substrate as well as corresponding maxima in the spectra of local surface plasmon absorption. Plasmon effects of the Raman scattering enhance in the matter of the Ag NP shell gave the opportunity to register the spectral bands caused by an extremely small quantity of silver compounds with oxygen and carbon. The possible nature of individual bands in the Raman spectrum was analyzed. The obtained results are important for interpretation of the Raman spectra of analytes based on the prepared SERS substrates.

Nanotechnology on Breaking Corm Dormancy in Elephant Foot Yam [Amorphophallus paeoniifolius (Dennst.) Nicolson]

“…The peaks were observed at 221, 1039.5, 1354.1 and 1646.6 cm -1 for Ag, while at 185.2, 289.3, 368.7 and 797.3 cm -1 for ZnO,195.5,395.7,513.8,635.3 cm -1 for TiO 2 , 185.2, 289.3, 463.6, 723.9, 797.3 cm -1 for CeO and 187.8,289.3,660.5,757.4,797.3 cm -1 for ZVI. The raman spectra peaks for Ag, ZnO, TiO 2 , CeO and ZVI nanoparticles confirmed the respective compounds and are supported by the earlier reports of Strelchuk et al (2015), Guo et al (2012) and Madhavi et al (2013) respectively.…”

Structure, Optical and Photocatalytic Properties of ZnO Nanostructures Grown on Ag-Coated Si Substrates

“…An increase in the annealing temperature up to 900 • C causes a significant change in the shape of the Raman spectrum of ZnO NS grown on Ag/Si substrates, namely, a wide intense band in the spectral region 90-260 cm −1 is transformed into a narrow intense E low Additionally, in the Raman spectra of as-grown and annealed at 600 • C ZnO NS deposited on Ag/Si substrates, structured wide intense bands appear in the spectral region of 90-260 cm −1 . The intensive wide bands at 95 and 146 cm −1 are attributed to Ag lattice vibrational modes [14,15]. Moreover, in the Raman spectra of the as-grown and annealed at 600 • C ZnO/Ag/Si NS, one can see additional features at 360, 498, and 567 cm −1 (indicated in Fig.…”

Morphological features of micro- and nanoporous silver and copper films synthesized by the substitution reaction method

“…In turn, the latter characteristics depend on the synthesis method of the metallic nanoporous layer. The second important application area of microand nanoporous metal layers is bio-and chemical sensors based on Raman scattering [5][6][7][8][9][10][11][12]. When surface plasmons propagate in a porous or fractal metal film, " hot spots"can occur therein.…”

“…There are many methods for synthesizing metal nanoporous layers: chemical and vacuum deposition, electron beam lithography, laser ablation, etc. [1][2][3][4][5][6][7][8][9][10][11][12][14][15][16][17][18]. However, most of these methods are multistep and require complex and expensive equipment.…”