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Size tunable elemental copper nanoparticles [electronic resource] : extracellular synthesis by thermoanaerobic bacteria and capping molecules

Published:
Washington, D.C. : United States. Dept. of Energy. Office of Energy Efficiency and Renewable Energy, 2014.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description:
pages 644-650 : digital, PDF file
Additional Creators:
Oak Ridge National Laboratory, United States. Department of Energy. Office of Energy Efficiency and Renewable Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary:
Bimodal sized elemental copper (Cu) nanoparticles (NPs) were synthesized from inexpensive oxidized copper salts by an extracellular metal-reduction process using anaerobic Thermoanaerobacter sp. X513 bacteria in aqueous solution. The bacteria nucleate NPs outside of the cell, and they control the Cu2+ reduction rate to form uniform crystallites with an average diameter of 1.75 0.46 m after 3-day incubation. To control the size and enhance air stability of Cu NPs, the reaction mixtures were supplemented with nitrilotriacetic acid as a chelator, and the surfactant capping agents oleic acid, oleylamine, ascorbic acid, or L-cysteine. Time-dependent UV-visible absorption measurements and XPS studies indicated well-suspended, bimodal colloidal Cu NPs (70 150 and 5 10 nm) with extended air-stability up to 300 min and stable Cu NP films surfaces with 14% oxidation after 20 days. FTIR spectroscopy suggested that these capping agents were effectively adsorbed on the NP surface providing oxidation resistance in aqueous and dry conditions. Compared to previously reported Cu NP syntheses, this biological process substantially reduced the requirement for hazardous organic solvents and chemical reducing agents, while reducing the levels of Cu oxide impurities in the product. This process was highly reproducible and scalable from 0.01 to 1-L batches.
Report Numbers:
E 1.99:1185382
Subject(s):
Note:
Published through SciTech Connect.
11/10/2014.
"ED2701000"
"CEED492"
Journal of Materials Chemistry. C 3 3 ISSN 2050-7526 AM
Gyoung Gug Jang; Christopher B. Jacobs; Ryan G. Gresback; Ilia N. Ivanov; Harry M. Meyer, III; Michelle Kidder; Pooran C. Joshi; Gerald Earle Jellison, Jr; Tommy Joe Phelps; David E. Graham; Ji Won Moon.
Funding Information:
AC05-00OR22725
View MARC record | catkey: 24045479