期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 309, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2020.127815
关键词
Molecular imprinting sensor; Electrochemical detection; MXene; NH2-CNTs; Fisetin
资金
- National Natural Science Foundation of China [51862014, 21665010, 31741103, 21563014, 51302117]
- Natural Science Foundation of Jiangxi Province [20192BBEL50029]
- National College Students' innovation and entrepreneurship training program [201810410013]
- Natural Science Foundation of Nanchang City [2018CXTD014]
In this work, a highly selective and sensitive electrochemical sensor based on hierarchical porous MXene/amino carbon nanotubes (MXene/NH2-CNTs) composite and molecularly imprinted polymer (MIP) was developed for fisetin detection. The porous MXene/NH2-CNTs films were fabricated by self-assembly of negatively charged Ti3C2Tx MXene flakes and positively charged NH2-CNTs. The utilization of conductive NH2-CNTs as interlayer spacers efficiently inhibited the aggregation of MXene flakes and formed a well-defined porous structure, as a result of increasing the effective surface area, an enhancement of the electrical conductivity and electrocatalytic activity was observed. This sensor takes advantages of molecularly imprinted technique and MXene/NH2-CNTs nanomaterials to achieve high selectivity and high sensitivity for the determination of fisetin. The factors that affect sensor response were studied and optimized. The as-prepared molecular imprinting sensor, under the optimized conditions, presented a good linear relationship with the fisetin concentration ranging from 0.003 mu mol L-1 to 20.0 mu mol L-1 with a limit of detection (LOD) of 1.0 nmol L-1. Besides, with favorable stability and selectivity, this newly developed sensor was utilized for the detection of fisetin in actual samples with satisfactory results.
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