Journal
APPLIED SURFACE SCIENCE
Volume 434, Issue -, Pages 155-162Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2017.10.121
Keywords
Graphene quantum dots; Adenine; Fluorescence; Two-photon bioimaging; White light-activated antibacteria
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Funding
- Ministry of Science and Technology of China [2017YFA0205302]
- Sci-tech Support Plan of Jiangsu Province [BE2014719]
- Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM)
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) [YX03001]
- National Natural Science Foundation of China [61705113]
- University Science Research Project of Jiangsu Province [NY217007]
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A simple two-step microwave-assisted method was developed for the preparation of adenine-modified graphene quantum dots (A-GQDs) with striking fluorescence properties. The prepared A-GQDs with the lateral size of 3-5 nm and single-to few-layer thickness exhibit intense fluorescence with a quantum yield of 21.63% (excited at 350 nm) and an average lifetime of 4.47 ns. The A-GQDs are biocompatible and present two-photon green fluorescence, which render them suitable for two-photon fluorescent cell imaging. More interestingly, we demonstrate for the first time that the A-GQDs also possess white light-activated antibacterial property. Due to their excellent photoluminescence performance and ease of biological conjugation, A-GQDs can be envisioned as an emerging role for many multifunctional biomedical applications. (C) 2017 Elsevier B.V. All rights reserved.
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