Hierarchical porous MXene/amino carbon nanotubes-based molecular imprinting sensor for highly sensitive and selective sensing of fisetin.

Ma, Xue; Tu, Xiaolong; Gao, Feng; Xie, Yu; Huang, Xigen; Fernandez, Carlos; Qu, Fengli; Liu, Guangbin; Lu, Limin; Yu, Yongfang

Abstract

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 μmol L-1 to 20.0 μmol 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.

Citation

MA, X., TU, X., GAO, F., XIE, Y., HUANG, X., FERNANDEZ, C., QU, F., LIU, G., LU, L. and YU, Y. 2020. Hierarchical porous MXene/amino carbon nanotubes-based molecular imprinting sensor for highly sensitive and selective sensing of fisetin. Sensors and actuators B: chemical [online], 309, article ID 127815. Available from: https://doi.org/10.1016/j.snb.2020.127815

• Journal Article Type: Article
• Acceptance Date: Feb 3, 2020
• Online Publication Date: Feb 4, 2020
• Publication Date: Apr 15, 2020
• Deposit Date: Feb 6, 2020
• Publicly Available Date: Feb 5, 2021
• Journal: Sensors and actuators B: chemical
• Print ISSN: 0925-4005
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 309
• Article Number: 1275815
• DOI: https://doi.org/10.1016/j.snb.2020.127815
• Keywords: Molecular imprinting sensor; Electrochemical detection; MXene; NH2-CNTs; Fisetin
• Public URL: https://rgu-repository.worktribe.com/output/845424