Laser-assisted deposition of pure gold from (hexafluoroacetylacetonate)dimethylgold(III) and gas-phase luminescence identification of photofragments

Abstract

Pure gold films are deposited on germanium, silicon, silicon dioxide, and quartz by photolyzing (CH3)zAu-(hexafluoroacetylacetonate) in the gas phase. Shiny gold films are deposited at low incident fluences (<5 mJ/cm2), whereas higher fluences yield dull brown deposits. The effects of the fluence and the repetition rate of the pulsed laser on the morphology of the deposited film are studied by using SEM. The film quality is analyzed by using XPS and Auger spectroscopic methods. No detectable carbon is found in either the gold or brown films, indicating that both are pure gold with different surface morphologies. Luminescence in the gas phase is observed under the conditions used for the photodeposition. The emission spectrum, containing two bands having well-resolved vibronic fine structure, originates from dimeric gold, Au2. The spectroscopic identification of ligand-free gold indicates that there is a gas-phase photochemical component in the deposition process. Deposition mechanisms, including both a surface component and a gas-phase component, are discussed.

Multiphoton Fabrication

“…Following the singlephoton precedents, iron metal has been deposited directly from neat iron pentacarbonyl [109,110] and gold has been deposited from a solution containing dimethylgoldhexafluoroacetylacetonate. [111] We have also reported the deposition of silver nanoparticles from a solution of silver perchlorate by using a photoreducing agent. [112] Similarly, Kawata and coworkers have demonstrated the fabrication of 2D and 3D patterns of silver and 2D patterns of gold from aqueous solutions of AgNO 3 and HAuCl 4 , respectively.…”

Photochemical Deposition of ZnS from the Gas Phase and Simultaneous Luminescence Detection of Photofragments from a Single-Source Precursor, Zn(S2COCHMe2)2

“…In addition, luminescence spectroscopy can determine product internal energies and relaxations that are important to explain the laser deposition process. We have previously used these techniques to study the laser driven photochemical CVD processes from copper and gold hexafluoroacetylacetonate compounds. , “Real time” chemical information about activated gas-phase species involved in materials growth on substrates is difficult to obtain but is very important for better understanding and improving the CVD process.…”

Optical properties of thallium(I), lead(II) and bismuth(III) hexafluoroacetylacetonates. Intraligand phosphorescence under ambient conditions

“…We explored this possibility and selected the hexafluoroacetylacetonates of Tl þ , Pb 2þ and Bi 3þ for the present study. Metal hexafluoroacetylacetonates show a diagnostic IL phosphorescence around 500 nm with a characteristic vibronic structure [11][12][13]. In the absence of a heavy atom effect this IL phosphorescence appears only at low temperatures (e.g.…”