期刊
ACTA BIOMATERIALIA
卷 10, 期 10, 页码 4474-4483出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.actbio.2014.06.005
关键词
Microbial synthesis; ZnS nanoparticles; Thin films; Metal-reducing bacteria X513
资金
- US Department of Energy (DOE), Advanced Manufacturing Office, Low Temperature Material Synthesis Program [CPS 24762]
- Oak Ridge National Laboratory (ORNL), Laboratory Directed Research and Development Program Launch Initiative
- ORNL Scientific User Facilities Division
- DOE Office of Basic Research Sciences
- DOE [DE-AC05-00OR22725]
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 similar to 5 nm crystallites at yields of similar to 5 g I-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. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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