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Mechanochemical dry synthesis of nanocrystalline semiconductors

P. Balaz, E. Godocikova, K. Izdinsky, J. Kovac, A. Satka and M. Achimovicova
Institute of Geotechnics of Slovak Academy of Sciences, SK

nanoparticles, quantum dots, reactive milling, sulfides

In recent years semiconductor nanocrystals (QD) have attracted much attention due to their great potential in technological applications. Electronic, optical and other properties of QD with respect to corresponding bulk materials are modified considerably, offering a number of potential applications in semiconductor and other industries.
Nanosized materials have been synthesized by a number of techniques starting from vapor phase (i.e. inert gas condensation), liquid phase (i.e. rapid solidification) and solid state (i.e. reactive milling). The technique starting from solid state applies mechanochemical approach (reactive milling) where synthesis of new compounds can be performed by solid state reactions. We have developed the mechanochemical route to produce MeS nanocrystals applying reactive milling of metal acetates Me(Ac)2 (Me=Zn, Cd, Pb) with sodium sulphide Na2S. ZnS, CdS and PbS have been obtained with estimated sizes 5 nm, 5 nm and 8 nm, respectively. Individual nanocrystals have tendency to form nanoparticle agglomerates and these entities have been identified by SEM method.The main advantage of the mechanochemical approach for preparation of semiconductor nanocrystals via reactive milling is that it is “a quantity process” permitting kilogram quantities of materials to be produced at an ambient temperature in a very short processing time.

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