Abstract
Facile thiamine-assisted hydrothermal synthesis of silver sulphide (Ag2S) microcrystals in the water/ethanol binary solution is reported. The reaction conditions including the contents of reactants, solvents and reaction times, were optimised. The morphology, phase composition and optical properties of the as-prepared Ag2S product were characterised with scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Raman spectrometry and photoluminescence (PL). The results indicate that the synthesised cubic Ag2S microcrystals have strong PL in the blue-light range. A possible synthesis mechanism was proposed for the cubic Ag2S microcrystals. It is noteworthy that no toxic hydrogen sulphide was released from the environmentally friendly synthesis reaction proposed in the present work. This is for the first time that thiamine, an ordinary and cheap biomolecule, was used as the S source for the preparation of Ag2S microcrystals.
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