@conference{
author = "Rajčić, Boris M. and Dimitrijević, Silvana B. and Petković, Marijana and Nišavić, Marija and Cindrić, Mario and Veljković, Filip M. and Veličković, Suzana",
year = "2017",
abstract = "In this work we have studied the vapor species which are generated by pulsed Nd:YAG laser ablation of chloroauric acid (HAuCl4) in the absence of a buffer or reactive atmosphere and without postablation supersonic expansion. The laser ablation of HAuCl4 into vacuum generates significant yields of gold chloride cluster ions, the compositions of which were analyzed by time-of-flight mass spectrometry with a commercial matrix assisted laser desorption/ionization (MALDI) instrument. Pulsed laser ablation and vaporization of solids have found wide application in the deposition of thin films of a wide variety of materials for various purposes such as producing a high-quality semiconductor films for electronic and optoelectronic devices [1]. For this reason many laser ablation studies have been focused on the properties and performance of such deposited materials. Also, a large efforts have aimed at characterizing laser-solid interactions and ablation vapor plume [2]. On the other side, the laser ablation it has been successfully applied for generating novel and large vapor cluster species such as homogenous and heterogeneous metal clusters [3]. Earlier results have shown that the ablation of laser–gold nanofilm (Au NF) under irradiation with a nanosecond pulsed laser probably follows a photothermal evaporation mechanism, in which absorption of laser energy by the Au NF leads to formation of Au-nanoparticles via spinodal dewetting, followed by surface melting, and eventually a decrease in size or splitting, due to evaporation from surface atoms or the entire particle. The formation of Au cluster ions during the evaporation of Au NFs is accompanied by electron ejection [4]. Gold halide clusters have significant applications in catalysis, optics, medicaments, and environmental sciences. This work shows the possible formation of gold chloride cluster ions by the laser ablation. A small volume (0.5 μl) of HAuCl4 solution was applied onto the stainless-steel sample plate and left to dry at room temperature. Different concentration of HAuCl4 solution were analyzed, such as: 2,5 g Au/dm3 (initial solution), 0,25 g Au/dm3, and 0,025 g Au/dm3. The laser intensity was varied between 4000-5000 a.u. and the average of 1800 laser shots were taken for each spectrum. Preliminary results shows the formation of negative gold chloride cluster ions, such as: AuCl(HCl)(H2O), AuCl2, AuCl2(HCl)2H2O, AuCl2(HCl)2(H2O)3, AuCl2(HCl)2(H2O)4, AuCl2(HCl)3(H2O)3, Au2Cl(HCl)3H2O, Au2Cl(HCl)3(H2O)3, AuCl2(HCl)3(H2O)4, Au2Cl(HCl)5H2O, AuCl3(HCl)2(H2O)5, Au2Cl(HCl)6H2O, AuCl4(HCl)4, Au2Cl(HCl)5(H2O)2, Au2Cl2(HCl)6(H2O)5. Concerning different concentrations, the spectra have shown that the intensities of these complex composition clusters, [AuxCly(HCl)m(H2O)n], formed from the HAuCl4 increase with decreasing the concentration of HAuCl4 solution.",
publisher = "Belgrade : Institute of Physics Belgrade",
journal = "PHOTONICA2017 : 6th International School and Conference on Photonics and COST actions: MP1406 and MP1402 : Program and the book of abstracts",
title = "Gold chloride cluster ions generated by vacuum laser ablation",
pages = "171-171",
url = "https://hdl.handle.net/21.15107/rcub_vinar_13349"
}