Ex situ formation of metal selenide quantum dots using bacterially derived selenide precursors

Luminescent quantum dots were synthesized using bacterially derived selenide (SeII−) as the precursor. Biogenic SeII− was produced by the reduction of SeIV by Veillonella atypica and compared directly against borohydride-reduced SeIV for the production of glutathione-stabilized CdSe and β-mercaptoet...

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Bibliographic Details
Published in:Nanotechnology 2013-04, Vol.24 (14), p.145603-1-10
Main Authors: Fellowes, J W, Pattrick, R A D, Lloyd, J R, Charnock, J M, Coker, V S, Mosselmans, J F W, Weng, T-C, Pearce, C I
Format: Article
Language:English
Subjects:
Applied sciences
Bacteria
Bacterial Proteins - metabolism
Cadmium Compounds - metabolism
Cross-disciplinary physics: materials science
rheology
Electronics
Exact sciences and technology
Glutathione - metabolism
Luminescence
Materials science
Methods of nanofabrication
Methylmalonyl-CoA Decarboxylase - metabolism
Microscopy, Electron, Transmission
Molecular electronics, nanoelectronics
Nanocrystalline materials
Nanoscale materials and structures: fabrication and characterization
Nanotechnology
Oxidation-Reduction
Particle Size
Physics
Quantum Dots
Selenium Compounds - metabolism
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Synchrotrons
Veillonella
Veillonella - metabolism
Veillonella parvula
X-Ray Absorption Spectroscopy
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Summary:Luminescent quantum dots were synthesized using bacterially derived selenide (SeII−) as the precursor. Biogenic SeII− was produced by the reduction of SeIV by Veillonella atypica and compared directly against borohydride-reduced SeIV for the production of glutathione-stabilized CdSe and β-mercaptoethanol-stabilized ZnSe nanoparticles by aqueous synthesis. Biological SeII− formed smaller, narrower size distributed QDs under the same conditions. The growth kinetics of biologically sourced CdSe phases were slower. The proteins isolated from filter sterilized biogenic SeII− included a methylmalonyl-CoA decarboxylase previously characterized in the closely related Veillonella parvula. XAS analysis of the glutathione-capped CdSe at the S K-edge suggested that sulfur from the glutathione was structurally incorporated within the CdSe. A novel synchrotron based XAS technique was also developed to follow the nucleation of biological and inorganic selenide phases, and showed that biogenic SeII− is more stable and more resistant to beam-induced oxidative damage than its inorganic counterpart. The bacterial production of quantum dot precursors offers an alternative, 'green' synthesis technique that negates the requirement of expensive, toxic chemicals and suggests a possible link to the exploitation of selenium contaminated waste streams.
ISSN:0957-4484
1361-6528
DOI:10.1088/0957-4484/24/14/145603