Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 848, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.156556
Keywords
Carbon-coated Cu nanoparticles; Sol-gel combined with carbothermal method; Antibacterial properties; Green synthesis
Categories
Funding
- National Natural Science Foundation of China [51802046]
- Natural Science Foundation of Guangdong Province [2018A0303 13656]
- GDAS' Project of Science and Technology Development [2020GDASYL-20200104009]
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Copper nanoparticles (Cu-NPs) have attracted attention because of their wide range of applications. However, the synthesis of Cu-NPs is difficult because they are easily oxidized. This work describes a novel method of sol-gel and carbothermal reduction for the synthesis of highly stable Cu-NPs in aqueous medium using gamma-polyglutamic acid (gamma-PGA) as a dispersant and Tween-80 as a reducing agent. The microstructures showed the gamma-PGA and Tween-80 co-synthesized Cu-NPs were nearly spherical, 2545 nm in diameter and coated with a carbon layer. The X-ray diffraction, X-ray photoelectron spectroscopy results showed the carbon-coated Cu-NPs (C/Cu-NPs) contained zero-valent coppers with high stability against oxidation. Antibacterial and cytotoxic studies showed the C/Cu-NPs had more potent antibacterial activities and were less cytotoxic than the control CuO NPs. The study provides compelling evidence that C/Cu-NPs should find applications in biomedicine because of their stable chemical properties, good antibacterial activity and low cytotoxicity. (C) 2020 Elsevier B.V. All rights reserved.
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