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Acta Biomater. 2014 Oct;10(10):4474-83. doi: 10.1016/j.actbio.2014.06.005. Epub 2014 Jun 14.

Scalable production of microbially mediated zinc sulfide nanoparticles and application to functional thin films.

Author information

1
Biosciences Division, Oak Ridge National Laboratory (ORNL), Oak Ridge, TN 37831, USA. Electronic address: moonj@ornl.gov.
2
Center for Nanophase Materials Sciences Division, ORNL, Oak Ridge, TN 37831, USA.
3
Materials Science and Technology Division, ORNL, Oak Ridge, TN 37831, USA.
4
Environmental Science Division, ORNL, Oak Ridge, TN 37831, USA.
5
Biosciences Division, Oak Ridge National Laboratory (ORNL), Oak Ridge, TN 37831, USA.

Abstract

A series of semiconducting zinc sulfide (ZnS) nanoparticles were scalably, reproducibly, controllably and economically synthesized with anaerobic metal-reducing Thermoanaerobacter species. These bacteria reduced partially oxidized sulfur sources to sulfides that extracellularly and thermodynamically incorporated with zinc ions to produce sparingly soluble ZnS nanoparticles with ∼5nm crystallites at yields of ∼5gl(-1)month(-1). A predominant sphalerite formation was facilitated by rapid precipitation kinetics, a low cation/anion ratio and a higher zinc concentration compared to background to produce a naturally occurring hexagonal form at the low temperature, and/or water adsorption in aqueous conditions. The sphalerite ZnS nanoparticles exhibited narrow size distribution, high emission intensity and few native defects. Scale-up and emission tunability using copper doping were confirmed spectroscopically. Surface characterization was determined using Fourier transform infrared and X-ray photoelectron spectroscopies, which confirmed amino acid as proteins and bacterial fermentation end products not only maintaining a nano-dimensional average crystallite size, but also increasing aggregation. The application of ZnS nanoparticle ink to a functional thin film was successfully tested for potential future applications.

KEYWORDS:

Metal-reducing bacteria X513; Microbial synthesis; Thin films; ZnS nanoparticles

PMID:
24932768
DOI:
10.1016/j.actbio.2014.06.005
[Indexed for MEDLINE]

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