Ultra-short pulsed laser deposition of thin silver films for surface enhanced Raman scattering

被引：27

作者：

De Bonis, A. ^{[1
,2
,4
]}

Galasso, A. ^{[1
]}

Ibris, N. ^{[3
]}

Sansone, M. ^{[1
]}

Santagata, A. ^{[4
]}

Teghil, R. ^{[1
,2
]}

机构：

[1] Univ Basilicata, Dipartimento Chim AM Tamburro, I-85100 Potenza, Italy

[2] Consorzio Interuniv Nazl Sci & Tecnol Mat INSTM, I-00121 Florence, Italy

[3] Univ Basilicata, CIGAS, I-85100 Potenza, Italy

[4] CNR IMIP UOS Potenza, I-85050 Tito, PZ, Italy

来源：

SURFACE & COATINGS TECHNOLOGY | 2012年 / 207卷

关键词：

Silver nanoparticles; Ultra-short laser ablation; Laser induced plasma dynamics; Nanostructured thin silver films; SERS active substrate; NANOPARTICLE GENERATION; ABLATION; NANOMORPHOLOGY; SPECTROSCOPY; PLD;

D O I：

10.1016/j.surfcoat.2012.06.084

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

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.

引用

页码：279 / 285

页数：7

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