| Autor: |
Mawale, Ravi Madhukar, Amato, Filippo, Alberti, Milan, Havel, Josef |
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| Zdroj: |
Rapid Communications in Mass Spectrometry: RCM; Jul2014, Vol. 28 Issue 14, p1601-1608, 8p |
| Abstrakt: |
RATIONALE Metal tellurides have applications in various fields of science and technology but only a few gold-silver tellurides have been reported. The laser ablation synthesis (LAS) method allows the preparation of nano-materials from solid substrates. Therefore, this method was selected to synthesise some gold-silver tellurides. METHODS Laser desorption ionisation quadrupole ion trap time-of-flight mass spectrometry (LDI QIT TOF MS) was used for the generation of new Au pAg qTe r clusters. Scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX) were used to characterise the materials. The stoichiometry of the clusters generated was determined via collision-induced dissociation (CID) and modeling of isotopic patterns. RESULTS Chemisorption of gold and silver nano-particles on tellurium powder led to the formation of a new kind of Au-Ag-Te nano-composite. The LDI of this nano-composite yielded nine unary (Ag q, Te r), 40 binary (Au pTe r and Ag pTe r) and 78 ternary clusters. The stoichiometry of these novel Au pAg qTe r clusters is reported here for the first time. CONCLUSIONS The new Au-Ag-Te nano-composite was found to be a more suitable precursor for the generation of clusters than the mixtures of the elements. TOF MS was shown to be a useful technique for following the generation of gold-silver tellurides. Knowledge of the cluster stoichiometry could accelerate the further development of novel high-tech materials such as chalcogenide glasses. Copyright © 2014 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR] |
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