Journal
APPLIED SURFACE SCIENCE
Volume 282, Issue -, Pages 181-185Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2013.05.099
Keywords
Silver nanoparticles; Graphene oxide; Dopamine; Nanocomposite; Antibacterial property
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Funding
- Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry of China
- Fundamental Research Funds for the Central Universities, State Education Ministry of China
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Immobilization of silver nanoparticles (Ag NPs) on poly-dopamine (PDA) functionalized graphene oxide sheets (GOSs) were carried out by an easy in situ reduction method. The PDA layer was coated on the surface of the GOSs via the self-polymerization of dopamine under atmosphere condition. The PDA layer not only works as the chemisorption and reduction sites for silver ions to form Ag NPs but also stabilizes them. High-resolution transmission electron microscopy observation shows that the average size of the Ag NPs anchored on the PDA/GOS composite is about 2.8 nm. The inhibition zone diameter of the Ag@PDA/GOS nanocomposite is about 23.7 mm, whereas said diameter of the Ag NPs is only 18.5 mm. The minimum bactericidal concentration of the Ag@PDA/GOS nanocomposite is about 25 mu g/ml that is only half of said concentration of the Ag NPs. The Ag@PDA/GOS nanocomposite exhibits an excellent antibacterial property. (C) 2013 Elsevier B. V. All rights reserved.
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