期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 31, 页码 26118-26127出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b10529
关键词
graphitic carbon nitride nanosheets; iron ion; ascorbic acid; inner filter effect; photoinduced electron transfer
资金
- National Natural Science Foundation of China [21475046, 21427809]
A simple chemical oxidation and ultrasound exfoliation method has been developed to synthesize the two-dimensional and ultrathin-layer materials-graphitic carbon nitride nanosheets (g-C3N4 NNs). The prepared ultrathin g-C3N4 NNs display strong fluorescence and stability, including good photostability and excellent antisalt ability. Herein, a new on-off-on fluorescent switching sensor is designed. The iron ion (Fe3+) has an ultrasensitive response to quench the fluorescence of g-C3N4 NNs based on the synergistic effect between inner filter effect and photoinduced electron transfer. The linear limit for Fe3+ was from 0.05 to 30 mu mol L-1 with a detection limit of 0.018 mu mol L-1. Meanwhile, the fluorescence of g-C3N4 NNs can recover through the redox reaction between Fe3+ and ascorbic acid (AA). In addition, the linear range for AA was from 0.2 to 112.5 mu mol L-1 with a 0.086 mu mol L-1 detection limit. The proposed method exhibited rapid response, excellent selectivity, wide detection range, and low detection limit for simultaneous analysis of Fe3+ and AA, and it was applied for the determination of Fe3+ and AA in water sample and human serum with satisfactory results.
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