A facile and stable colorimetric sensor based on three-dimensional graphene/mesoporous Fe3O4 nanohybrid for highly sensitive and selective detection of p-nitrophenol

作者：Qiu, Na; Liu, Yan^*; Xiang, Min; Lu, Ximing; Yang, Qian; Guo, Rong^*

来源：Sensors and Actuators B: Chemical , 2018, 266: 86-94.

DOI：10.1016/j.snb.2018.03.059

• Mesoporous Fe3O4
• 3D graphene
• Peroxidase mimetics
• Colorimetric sensing
• p-Nitrophenol
• pi-Stacking interaction

To date, fabricating high sensitive, stable and facile sensing strategy for detection of nitrophenol still remains a challenge in practical applications. This article demonstrates for the first time a facile and stable colorimetric sensor based on three-dimensional graphene/mesoporous Fe3O4 (3D GF/m-Fe3O4) heterogeneous nanozyme. Using a simple hydrothermal procedure, mesoporous Fe3O4 nanoparticles were in situ synthesized on 3D GF. The 3D GF/m-Fe3O4 nanohybrid possesses high peroxidase mimicking activity due to the synergistic effect of 3D GF and m-Fe3O4. Based on the peroxidase-like activity and p-nitrophenol-mediated inhibition controllability, the nanohybrid was successfully adopted in the sensitive and selective sensing detections of p-nitrophenol (PNP) with a low detection limit of 45 nM. Moreover, 3D GF/m-Fe3O4 nanohybrid shows to be extremely robust, as it still retains its original response to PNP after being reused for 10 times. The method was applied to the determination of PNP in spiked lake water and gave good recoveries. With the merits of high sensitivity and selectivity, simplification, recyclability, and excellent stability, this sensing platform not only expands the application of 3D GF and Fe3O4, but also provides an alternative technique to construct robust nanozyme with multiple functionalities for various biological and environmental applications.

• 出版日期2018-8-1
• 单位扬州大学; 枣庄学院