期刊
BIOSENSORS & BIOELECTRONICS
卷 70, 期 -, 页码 69-73出版社
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2015.01.075
关键词
Graphene oxide; Nanosensor; Electron buffer; Logic gate; Cell imaging
类别
资金
- GRF project by the Research Grants Council of the Hong Kong SAR Government [PolyU 5316/10E]
- National Natural Science Foundation of China [21376197]
- Shenzhen Basic Research Project [JCYJ20130326112522124]
- Key Laboratory Project of Shenzhen [ZDSY20130329101130496]
A graphene oxide-based fluorescent nanosensor AGO has been designed and synthesized by covalent grafting allylamine onto GO surface. In aqueous media, AGO displays a highly selective and sensitive discrimination of Fe3+ from Fe2+ and other metal ions through electron transfer-induced fluorescence quenching. The quenching of AGO fluorescence is linearly proportional to Fe3+ concentration in a wide range of 0-120 mu M (correlation coefficient R-2=0.9994). Moreover, AGO can be used to construct a combinational three-input logic gate to discriminate Fe3+ and Fe2+. The logic gate works well in intracellular fluorescence imaging, which shows a potential as a promising platform for biosensing analysis. (C) 2015 Published by Elsevier B.V.
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