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FORMATION OF Sn-Ag-C AND Sn-Au-C NANOALLOYS THROUGH IR LASER ABLATION OF Ag AND Au TARGET AND SIMULTANEOUS DECOMPOSITION OF TMT IN THE GAS PHASE

Citace:
KŘENEK, T., MURAFA, N., ŠUBRT, J., BEZDIČKA, P., POLA, J. FORMATION OF Sn-Ag-C AND Sn-Au-C NANOALLOYS THROUGH IR LASER ABLATION OF Ag AND Au TARGET AND SIMULTANEOUS DECOMPOSITION OF TMT IN THE GAS PHASE. Olomouc, 2010.
Druh: PŘEDNÁŠKA, POSTER
Jazyk publikace: eng
Anglický název: FORMATION OF Sn-Ag-C AND Sn-Au-C NANOALLOYS THROUGH IR LASER ABLATION OF Ag AND Au TARGET AND SIMULTANEOUS DECOMPOSITION OF TMT IN THE GAS PHASE
Rok vydání: 2010
Autoři: Ing. Tomáš Křenek Ph.D. , Ing. Nataliya Murafa Ph.D. , Ing. Jan Šubrt CSc. , Dr., RNDr. Petr Bezdička , RNDr. Josef Pola DrSc.
Abstrakt EN: The Sn-Ag and Sn-Au alloys are widely considered as a promising alternative for the replacing of lead-based solder. We have examined a novel approach to gas-phase deposition of nanosized Sn-Ag and Sn-Au alloys embedded in a carbonaceous phase based on IR laser ablation of Ag or Au in a plume (dielectric breakdown) of tetramethyltin (TMT). In this approach, Ag/Au nanoparticles are propelled from the target and mixed with Sn clusters produced in the gas phase by the decomposition of TMT. The resulting Sn-Ag or Sn-Au structures are during their formation subject to heating and subsequent cooling within some ms. The decomposing TMT, serving as a carbon source, may provide additional stabilization of these metastable structures. We obtained thin Sn-Ag-C and Sn-Au-C films that were characterized by scanning electron microscopy (SEM), Raman spectroscopy, micro X-ray diffraction (μ-XRD) and high-resolution transmission electron microscopy (HRTEM). We revealed that the deposits consist of nanostructured metastable mostly amorphous Sn-Ag-C and Sn-Au-C phases containing nanoparticles of tetragonal Sn. The β-Sn nanoparticles in the Sn-Ag-C deposit are covered with crystalline shell whereas the Sn-Au-C film contains β-Sn with amorphous shell.
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