Electrochemical Sensing Based on Metal–Organic Frameworks-Derived Carbon/Molybdenum Disulfide Composites with Superstructure and Synergistic Catalysis

Abstract

Metal−organic frameworks (MOFs)-derived nanocomposite has attracted extensive attention due to its tunable nanoscale cavities and high chemical tailorability. Herein, with the aim of developing a sensitive electrochemical sensor for pnitrophenol, a novel MOFs-derived nanocomposite was prepared by the solvothermal method using Zr-MOFs, thiourea, and sodium molybdate as raw materials. By controlling the growth mode and reaction time, the nanohybrids displayed a superstructure composed of MOFs-derived carbon (MOFs-C) and MoS 2 . Scanning electron microscopy images indicated that MOFs-C/MoS 2 was a flower-like porous sphere. Transmission electron microscopic images showed that the MOFs-C/MoS 2 had a unique arrow targetlike structure. The porous structure held great promise for the fast mass transfer into the material, while the layer-by-layer distributed carbon and MoS 2 provided a great structure for the synergistic catalysis. The electrochemical oxidation of (hydroxyamino)phenol to nitrosophenol, which is an important process for the electrochemical behavior of p-nitrophenol, can be selectively catalyzed by the MOFs-C/MoS 2 . Therefore, the electrochemical sensor based on the MOFs-C/MoS 2 material exhibited excellent analytical performance in the determination of p-nitrophenol. Using the technique of square wave voltammetry, the peak current varied quantitatively with the presence of p-nitrophenol in the wide concentration range of 0.5−500 μM. Furthermore, the electrochemical sensor exhibited good practicability in real sample analysis.

Nanoscale materials at work: Mapping emerging applications in energy, medicine, and beyond

“…538,539 Another context in which thiourea often appears is in terms of development of nanosensors for its detection. [540][541][542][543] Molybdenum disulfide (MoS2) nanoparticles appears to be often employed in a variety of different nanostructures including quantum dots, 544 nanoroses 545 /flower-like structures, 546,547 and nanosheets [540][541][542][543]548 Molybdenum disulfide (MoS2) nanoparticles appears to be often employed in a variety of different nanostructures including quantum dots, 544 nanoroses 545 /flower-like structures, 546,547 and nanosheets 548 for environmental applications including monitoring water quality 545 and detection of volatile organic compounds 547 as well as biomedical applications such as detection of biomolecules 544,549,550 and health monitoring 551 to name a few. MoS2 is also often used as a modifier of CNTs 550,552,553 for environmental applications including monitoring water quality 545 and detection of volatile organic compounds 547 as well as biomedical applications such as detection of biomolecules 544,549,550 and health monitoring 551 to name a few.…”

A diazonium-functionalized silver electrode for the sensitive amperometric detection of p-nitrophenol in water over a wide range of concentrations

“…For instance, Luo et al have reported a sensor based on metal–organic framework-derived carbon/molybdenum disulfide composites which exhibited good sensitivity and LODs. 24 By their side, Deng et al have developed a sensor based on multi-walled carbon nanotubes functionalized with polyethylenimine which was found to be capable of selectively detecting and quantifying pNP and o -nitrophenol. 25 The wide range of functionalization dedicated to the detection of pNP has been recently reviewed.…”