Graphene electrochemical transistors decorated by Ag nanoparticles exhibiting high sensitivity for the detection of paraquat over a wide concentration range

Abstract

Paraquat (PQ) is a nonselective contact herbicide used in agriculture for the control of broad leaf weeds, which would cause irreversible damages to human organs even at very low concentrations....

Facile one-step synthesis of a niobium iron oxide based electrochemical transistor for rapid, label-free detection of folic acid in human blood serum samples

“…The peak at 3438 cm À1 indicated the presence of moisture. 39 3.2 Sensing performance of the NbFeO 4 -modified sensor towards FA The NbFeO 4 -based sensor was characterized electrochemically via cyclic voltammetry (CV) in 0.1 M PBS (pH = 7.2). As shown in Fig.…”

Advances in graphene-based electrochemical biosensors for on-site pesticide detection

“…Wang et al, unveiled the utilization of graphene electrochemical transistors (ECTs) with silver nanoparticles, exhibiting high sensitivity toward paraquat. The device incorporated a layer of silver nanoparticles modified graphene as the channel (Wang et al, 2023). Employing monolayer graphene as a channel, this device displayed a LOD of 0.068 nM while retaining selectivity against common interfering herbicides.…”

A new colorimetric aptasensor for paraquat detection based on the designed aptamer with multiple paraquat binding sites in combination with gold nanoparticles

“…Several approaches have been established to quantify paraquat residues, including liquid chromatography, 6 high performance liquid chromatography, 7 fluorescence assay, 8 ion mobility spectrometry, 9 surface-enhanced Raman spectroscopy, 10 electrochemistry, 11 and electrochemiluminescence-fluorescence sensing. 12 Although these methods demonstrate high sensitivity in detecting paraquat, they are accompanied by certain limitations such as high costs, the prerequisite of advanced laboratory instruments, intricate procedures, time-consuming processes, and the requirement for skilled technicians to operate them.…”