Ravi Mawale, Milan Alberti, Zhang Bo, Max Fraenkl, Tomas Wagner, Josef Havel

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Authors

MAWALE Ravi ALBERTI Milan BO Zhang HAVEL Josef WAGNER Tomas FRAENKL Max

Year of publication 2015
Type Conference abstract
MU Faculty or unit

Faculty of Science

Citation
Description The AgAsS2 glass has wide applications in optics, optoelectronics and phase change memories [1]. The structure of this glass is still not well understood. Elucidation of a structure might help in the development of this material. The AgAsS2 glass was prepared by the melt-quenched technique. The product was characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM) and energy dispersive x-ray (EDX) spectroscopy. The clusters generated during laser desorption ionization (LDI) of AgAsS2 glass were identified by a quadrupole ion trap time-of-flight mass spectrometer (QIT-TOFMS). The formation of singly charged 3 unary (Ag+/- and As3+), 38 binary (AsnSx, AgmSx) and 98 ternary (AgmAsnSx) clusters was proved. Silver rich nano-grains are formed during AgAsS2 glass synthesis. These nano-grains have been identified using TEM analysis and verified also by QIT TOF mass spectrometry. The results show that the structure of AgAsS2 glass is “nanograin-like” where grains are either 1. silver rich “islands” (Agm, m up to 39) connected by arsenic and/or sulphur or arsenic sulphide chains as a kind of "glue" or 2. silver sulphide (Ag2S)m (m =9-20) clusters inter-connected with similar "glue". TOFMS was shown to be a useful technique to study clusters generated from various materials [2-3]. Structural information obtained can be useful for development of ultra-high-density phase-change storage and memory devices using this kind of glass. References: [1] J-L. Adam, X. Zhang. Chalcogenide Glasses: Preparation, Properties and Applications. Woodhead Publishing Limited, UK, 2014. [2] R. M. Mawale, F. Amato, M. Alberti, J. Havel. Generation of new AgmTen clusters via laser ablation synthesis using Ag-Te nano-composite as precursor. Quadrupole ion trap time-of-flight mass spectrometry. Rapid Commun. Mass Spectrom. 2014, 28, 2753. [3] R. M. Mawale, F. Amato, M. Alberti, J. Havel. Generation of AupAgqTer clusters via laser ablation synthesis using Au-Ag-Te nano-composite as precursor: quadrupole ion-trap time-of-flight mass spectrometry. Rapid Commun. Mass Spectrom. 2014, 28, 1601.
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