Functionalized silver nanoparticles with graphene quantum dots shell layer for effective antibacterial action
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RESEARCH PAPER
Functionalized silver nanoparticles with graphene quantum dots shell layer for effective antibacterial action Li Zhang & Liyuan Liu & Jie Wang & Mei Niu & Chao Zhang & Shiping Yu & Yongzhen Yang
Received: 21 February 2020 / Accepted: 14 April 2020 # Springer Nature B.V. 2020
Abstract Graphene quantum dots (GQDs) as a shell layer was coated on the surface of silver nanoparticles (AgNPs) to obtain an effective antibacterial composite (GQDs@AgNPs). The structures and antibacterial properties of AgNPs, GQDs, and GQDs@AgNPs were studied. SEM and TEM results indicated that GQDs were coated on the surface of AgNPs. For GQDs@AgNPs, the core size of AgNPs was about 20 nm, and the shell thickness of GQDs was about 5 nm. The formation and antibacterial mechanism of GQDs@AgNPs composite materials were discussed in detail. It showed excellent antibacterial properties for E. coli and S. aureus.
L. Zhang (*) : C. Zhang Shanxi Bethune Hospital, Taiyuan 030032, China e-mail: [email protected] L. Liu : J. Wang : M. Niu College of Textile Engineering, Taiyuan University of Technology, Yuci 030600, China M. Niu (*) : Y. Yang Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology, Ministry of Education, Taiyuan 030024, China e-mail: [email protected] S. Yu The Second Hospital of Shanxi Medical University, Taiyuan 030001, China Y. Yang Research Center on Advanced Materials science and Technology, Taiyuan University of Technology, Taiyuan 030024, China
Keywords AgNPs . GQDs . Core-shell . Nanoscale . Antibacterial activity
Introduction In recent years, silver nanoparticles (AgNPs) have been widely used in medical antibacterial field due to its high antibacterial efficiency, broad antibacterial spectrum, and low cytotoxicity (Wang et al. 2018). The size effects of nanomaterials make AgNPs have a large specific surface area. This structure provides a lot of contact sites for various reactions. It is easy to combine with foreign atoms and release silver ions, which make AgNPs have excellent antibacterial effect, high safety and longlasting effect. However, due to the high surface energy and reactivity of AgNPs, single AgNPs is easily oxidized and agglomerated (Sanaz et al. 2019). These defects resulted in the sharply decrease of the antibacterial activity for AgNPs. In order to overcome these shortcomings and achieve high antibacterial activity, researchers often modify AgNPs to improve their dispersibility by all kinds of methods (Yang et al. 2019; Porcaro et al. 2016; Zhan et al. 2017). K. Prasad and G.S. Lekshmi (Prasad and Lekshmi 2017) firstly loaded AgNPs onto the graphene sheet layer by the wet chemical method. J.D. Kim et al. (Kim et al. 2013) caused AgNPs loaded on the surface of carbon nanotubes via thiol bridging groups. L. Yu et al. (Yu et al. 2014) slowed down the agglomeration degree of AgNPs by directly growing it on the halloysite nanotube (HNT). These work mainly reduced the agglomeration degree of
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AgNPs. However, it was not sa
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