Abstract
Nanocrystals of PbS were synthesized by using Aspergillus sp. isolated from the rhizosphere of Chickpea. For this, PbS-tolerant fungi were isolated from the rhizosphere soil by serial dilution method and plated on potato dextrose agar supplemented with 1 mM lead acetate and 0.1 % sodium sulfide. PbS-tolerant fungus was identified as Aspergillus sp. by fluorescence microscopy. The PbS nanocrystals were characterized by UV-visible absorption spectroscopy, x-ray diffraction (XRD), particle size analyzer (PSA), and transmission electron microscope (TEM). UV-visible absorption scan revealed a peak at 300 nm, a characteristic of the nanosize range. Characteristic peaks at around 26° and 30° were observed in XRD analysis of samples of fungal fabricated quantum dots. Crystallite size as determined from transmission electron microscopy was found to be in the range of 10–15 nm.
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