AI Article Synopsis
- * The bacteria actively volatilized selenium by reducing selenite, while simultaneously removing bismuth and selenium from the growth media to synthesize nanoparticles, with strain NT-I proving to be the most effective in producing pure BiSe.
- * The synthesized nanoparticles, measuring 50-100 nm in diameter, are small enough to exhibit quantum size effects, and the efficient synthesis is linked to the high selenium volatilizing capability of the bacterial strains.
Article Abstract
Cost and energy reductions in the production process of bismuth chalcogenide (BC) semiconductor materials are essential to make thermoelectric generators comprised of BCs profitable and CO neutral over their life cycle. In this study, as an eco-friendly production method, bismuth selenide (BiSe) nanoparticles were synthesized using the following five strains of chalcogen-metabolizing bacteria: Pseudomonas stutzeri NT-I, Pseudomonas sp. RB, Stenotrophomonas maltophilia TI-1, Ochrobactrum anthropi TI-2, and O. anthropi TI-3 under aerobic conditions. All strains actively volatilized selenium (Se) by reducing selenite, possibly to organoselenides. In the growth media containing bismuth (Bi) and Se, all strains removed Bi and Se concomitantly and synthesized nanoparticles containing Bi and Se as their main components. Particles synthesized by strain NT-I had a theoretical elemental composition of BiSe, whereas those synthesized by other strains contained a small amount of sulfur in addition to Bi and Se, making strain NT-I the best BiSe synthesizer among the strains used in this study. The particle sizes were 50-100 nm in diameter, which is sufficiently small for nanostructured semiconductor materials that exhibit quantum size effect. Successful synthesis of BiSe nanoparticles could be attributed to the high Se-volatilizing activities of the bacterial strains. Selenol-containing compounds as intermediates of Se-volatilizing metabolic pathways, such as methane selenol and selenocysteine, may play an important role in biosynthesis of BiSe.
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