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

DOI: 10.1088/0957-4484/24/14/145603 DOI Help
PMID: 23508116 PMID Help

Authors: J. W. Fellowes (University of Manchester) , R. A. D. Pattrick (University of Manchester) , J. R. Lloyd (University of Manchester) , J. M. Charnock (University of Manchester) , V. S. Coker (University of Manchester) , J. F. W. Mosselmans (Diamond Light Source) , T.-c. Weng (SLAC National Accelerator Laboratory) , C. I. Pearce (University of Manchester)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Nanotechnology , VOL 24 (14)

State: Published (Approved)
Published: April 2013

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

Journal Keywords: Absorption Spectroscopy; Cadmium Selenides; Decarboxylases; Glutathione; Luminescence; Oxidation; Precursor; Quantum Dots; Selenium; Streams; Synthesis; Toxicity; X-Ray Spectroscopy; Zinc Selenides

Subject Areas: Chemistry

Instruments: I18-Microfocus Spectroscopy