TAILIEUCHUNG - Lasers Applications in Science and Industry Part 9

Tham khảo tài liệu 'lasers applications in science and industry part 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 8 Pulsed-Laser Ablation of Au Foil in Primary Alcohols Influenced by Direct Current Karolina Siskova Dept. of Physical Chemistry RCPTM Palacky University in Olomouc Czech Republic 1. Introduction Almost two decades ago Henglein pioneered the application of laser pulses for the synthesis of nanoparticles Amendola Meneghetti 2009 as cited in Henglein et al. 1993 . Since that the pulsed-laser ablation process of a foil performed in liquids is one of the topdown processes of nanomaterials generation. In a nutshell laser pulses are focused into a metallic target immersed in a particular liquid producing thus nanoparticles dispersions Amendola Meneghetti 2009 Georgiou Koubenakis 2003 Zhigilei Garrison 1999 . Noble metal nanoparticles are frequently formed by this approach because of a well-known fact that the as-prepared nanoparticle solutions do not contain any by-products and chemicals remaining from usual bottom-up approaches such as chemical syntheses. Hence pulsed-laser ablation constitutes a green technique of nanoparticles formation. There are several other benefits which make pulsed-laser ablation process attractive. One of them lies in the choice of ablation medium which is usually determined by a further usage of noble metal nanoparticles. So far numerous papers have been written about pulsed-laser ablation performed in water and in aqueous solutions of simple ions . Prochazka et al 1997 Srnová et al 1998 Siskova et al 2008 surfactants . Fong et al 2010 organic molecules . Darroudi et al 2011 Kabashin et al 2003 Mafune et al 2002 Siskova et al 2007 2008 2011 or even DNA Takeda et al 2005 . In the literature there have also been published pulsed-laser ablation processes of metallic foils performed in ionic liquids Wender et al. 2011 or in a wide range of organic solvents such as chloroform Compagninni et al. 2002 Mortier et al 2003 Siskova et al 2010 toluene Amendola et al. 2005 tetrahydrofurane Amendola et al. 2007 dimethylsulfoxide Amendola et al. .

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