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Ultra-short pulsed laser deposition of thin silver films for surface enhanced Raman scattering
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DOI：10.1016/j.surfcoat.2012.06.084.png)
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Abstract
En 中文
Nanostructured thin films have been obtained by ultra-short pulsed laser deposition (PLD) of silver performed in vacuum. The ablation source used in these experiments was a frequency doubled (lambda = 527 nm) Nd:glass laser with a pulse duration of 250 fs. The films have been characterized by UV-vis spectroscopy, atomic force microscopy and transmission electron microscopy. The surface enhanced Raman scattering activity results, investigated by Raman scattering of rhodamine B adsorbed onto rough silver substrates, are strongly related to the effective surface area (ESA) of the silver surfaces. Surprisingly, silver films obtained by ultra-short PLD are very similar to those obtained by short PLD. With the aim of explaining this likeness, the dynamics of plasmas induced by short and ultra-short laser pulses have been studied by optical emission spectroscopy and fast imaging. Composition, velocity, excitation temperature and density of short and ultra-short plasmas are quite similar, showing that film properties are strongly related to the plasma features. (c) 2012 Elsevier B.V. All rights reserved.
Keywords:
Silver nanoparticles
Ultra-short laser ablation
Laser induced plasma dynamics
Nanostructured thin silver films
SERS active substrate
Journal
IF:
6.1
Papers:
2.8W
Citations:
7.1W