Bacterial synthesis of PbS nanocrystallites in one-step with l-cysteine serving as both sulfur source and capping ligand

Abstract The green bacterial biosynthesis of lead sulfide nanocrystallites by l-cysteine-desulfurizing bacterium Lysinibacillus sphaericus SH72 was demonstrated in this work. Nanocrystals formed by this bacterial method were characterized using the mineralogical and morphological approaches. The res...

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Main Authors:	Shiping Wei, Ce Guo, Lijuan Wang, Jiangfeng Xu, Hailiang Dong
Format:	Article
Language:	English
Published:	Nature Publishing Group 2021-01-01
Series:	Scientific Reports
Online Access:	https://doi.org/10.1038/s41598-020-80450-7

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spelling	doaj-54e3f6736e594b7994223d62e3c85f072021-01-17T12:40:38ZengNature Publishing GroupScientific Reports2045-23222021-01-011111710.1038/s41598-020-80450-7Bacterial synthesis of PbS nanocrystallites in one-step with l-cysteine serving as both sulfur source and capping ligandShiping Wei0Ce Guo1Lijuan Wang2Jiangfeng Xu3Hailiang Dong4State Key Laboratory of Biogeology and Environmental Geology, China University of GeosciencesSchool of Marine Sciences, China University of GeosciencesSchool of Materials Science and Technology, China University of GeosciencesSchool of Materials Science and Technology, China University of GeosciencesState Key Laboratory of Biogeology and Environmental Geology, China University of GeosciencesAbstract The green bacterial biosynthesis of lead sulfide nanocrystallites by l-cysteine-desulfurizing bacterium Lysinibacillus sphaericus SH72 was demonstrated in this work. Nanocrystals formed by this bacterial method were characterized using the mineralogical and morphological approaches. The results revealed that the microbially synthesized PbS nanocrystals assume a cubic structure, and are often aggregated as spheroids of about 105 nm in size. These spheroids are composed of numerous nanoparticles with diameter 5–10 nm. Surface characterization of the bacterial nanoparticles with FTIR spectroscopy shows that the l-cysteine coats the surface of PbS nanoparticle as a stabilizing ligand. The optical features of the PbS nanocrystallites were assessed by UV–Vis spectroscopy and PL spectroscopy. The maximum absorption wavelength of the bacterial PbS particles occurs at 240 nm, and the photoluminescence emission band ranges from 375 to 550 nm. The band gap energy is calculated to be 4.36 eV, compared to 0.41 eV for the naturally occurring bulk PbS, with this clear blue shift attributable to the quantum size effect.https://doi.org/10.1038/s41598-020-80450-7
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Shiping Wei Ce Guo Lijuan Wang Jiangfeng Xu Hailiang Dong
spellingShingle	Shiping Wei Ce Guo Lijuan Wang Jiangfeng Xu Hailiang Dong Bacterial synthesis of PbS nanocrystallites in one-step with l-cysteine serving as both sulfur source and capping ligand Scientific Reports
author_facet	Shiping Wei Ce Guo Lijuan Wang Jiangfeng Xu Hailiang Dong
author_sort	Shiping Wei
title	Bacterial synthesis of PbS nanocrystallites in one-step with l-cysteine serving as both sulfur source and capping ligand
title_short	Bacterial synthesis of PbS nanocrystallites in one-step with l-cysteine serving as both sulfur source and capping ligand
title_full	Bacterial synthesis of PbS nanocrystallites in one-step with l-cysteine serving as both sulfur source and capping ligand
title_fullStr	Bacterial synthesis of PbS nanocrystallites in one-step with l-cysteine serving as both sulfur source and capping ligand
title_full_unstemmed	Bacterial synthesis of PbS nanocrystallites in one-step with l-cysteine serving as both sulfur source and capping ligand
title_sort	bacterial synthesis of pbs nanocrystallites in one-step with l-cysteine serving as both sulfur source and capping ligand
publisher	Nature Publishing Group
series	Scientific Reports
issn	2045-2322
publishDate	2021-01-01
description	Abstract The green bacterial biosynthesis of lead sulfide nanocrystallites by l-cysteine-desulfurizing bacterium Lysinibacillus sphaericus SH72 was demonstrated in this work. Nanocrystals formed by this bacterial method were characterized using the mineralogical and morphological approaches. The results revealed that the microbially synthesized PbS nanocrystals assume a cubic structure, and are often aggregated as spheroids of about 105 nm in size. These spheroids are composed of numerous nanoparticles with diameter 5–10 nm. Surface characterization of the bacterial nanoparticles with FTIR spectroscopy shows that the l-cysteine coats the surface of PbS nanoparticle as a stabilizing ligand. The optical features of the PbS nanocrystallites were assessed by UV–Vis spectroscopy and PL spectroscopy. The maximum absorption wavelength of the bacterial PbS particles occurs at 240 nm, and the photoluminescence emission band ranges from 375 to 550 nm. The band gap energy is calculated to be 4.36 eV, compared to 0.41 eV for the naturally occurring bulk PbS, with this clear blue shift attributable to the quantum size effect.
url	https://doi.org/10.1038/s41598-020-80450-7
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Bacterial synthesis of PbS nanocrystallites in one-step with l-cysteine serving as both sulfur source and capping ligand

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