Browsing by Author "Nkosi, Steven"

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    Visible and IR photoluminescence of c-FeSi@a–Si core–shell nano-fibres produced by vapour transport
    (Elsevier, 2013) Thabethe, Sibongiseni; Linganiso, Ella; Motaung, David; Mashapa, Matete G.; Nkosi, Steven; Arendse, Christopher; Mwakikung, Bonex W.
    The procedures for the synthesis of amorphous ε-FeSi/Sicore–shell nanofibres by vapour transport in a CVD configuration are reported. Crystallite studies by the Williamson-Hall method show the sizes to be typically about 8.0nm which agrees with TEM value of 7.9nm fibre diameter with a compressive strain of about 0.04. Features in the photoluminescence of these FeSi core–shells in both visible and IR are at 410nm,1062nm,1414nm and 1772nm and absorption feature at 1000cm−1 from FTIR are explained from density functional theory(DFT) abinitio calculations. PL confirms the intra-band transition whereas FTIR agrees perfectly with the band-to-band transition whose band gap energy is 0.13eV for FeSi. FTIR also unveils inter-bandtransition which DFT calculation could not predict. Raman spectroscopy data confirm FeSi and nano-Sipresence.