Mechanochemical synthesis and characterization of nanocrystalline BiSe, Bi2Se3 semiconductors
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Mechanochemical synthesis of bismuth selenides (BiSe, Bi2Se3) was performed by high-energy milling of bismuth and selenium powders in a planetary ball mill. The particle size distribution and the specific surface area of Bi/Se and 2Bi/3Se powder mixtures were analysed at increasing milling time. The products were characterized by X-ray diffraction, differential scanning calorimetry and transmission electron microscopy. The presence of bismuth selenide phases was observed after only 1 min of milling and full conversion into hexagonal BiSe phase (nevskite) and rhombohedral Bi2Se3 phase (paraguanajuatite) was reached after 10 min of milling. The nanocrystalline nature of both mechanochemically synthesised bismuth selenides was confirmed and their optical band gap energies were obtained on the basis of the recorded absorption spectra in UV–Vis spectral region.
KeywordsDifferential Scanning Calorimetry Milling Differential Scanning Calorimetry Measurement Bi2Se3 Energy Dispersive Spectroscopy
The present work was supported by the Slovak Grant Agency VEGA (project 2/0043/11), the Slovak Research and Development Agency APVV-0189-10, and Centre of Excellence of Advanced Materials with Nano- and Submicron-Structure (NANOCEXMAT) that is supported by the Operational Program “Research and Development” financed through European Regional Development Fund. This work was also supported by the cooperative CSIC-SAS project 2009SK0002 and the Spanish government under grant MAT2010-17046 that is financed in part by the European Regional Development Fund 2007–2013.