Ultrasensitive determination of chloramphenicol in pork and chicken meat samples using a portable electrochemical sensor: effects of 2D nanomaterials on the sensing performance and stability

Abstract

Functional two-dimensional (2D) structured nanomaterials, e.g. graphene oxide (GO) and molybdenum disulfide (MoS2), exhibiting many advantages including large surface areas and excellent electronic/mechanical/catalytic properties, were shown to be strong candidates...

Enhancing the chloramphenicol sensing performance of Cu–MoS2 nanocomposite-based electrochemical nanosensors: roles of phase composition and copper loading amount

“…The H + concentration is considered as the major cause of a decrease in the vicinity of the working electrode, and leads to a slight shift in the peak potential of CAP. 43 In particular, the lowest detectable CAP concentration, sensitivity, repeatability, as well as LOD were different for the different modified electrodes, as shown in Table 1 . Both CuO-NPs/SPE and Cu-NPs/SPE exhibited linear ranges in the concentration range of 2.5 to 50 μM, while Cu 2 O-NPs/SPE with the higher electroactive surface area (higher EASA value) and the electron transfer enhancement (lower R ct ) showed a wider linear range in the concentration range of 1 to 50 μM.…”

“…DPV is a differential technique that is immune to residual current and can be used to detect and quantify the analytes at trace levels in analytical applications. 43 Thus, DPV was used to determine the sensitivity, linear concentration range, and limit of detection towards CAP. Fig.…”

“…MoS 2 is known as a material with excellent electrocatalytic activity, however, the poor electrical conductivity significantly restricts its applications. 43 Meanwhile, Cu-NPs are an outstanding conductive nanomaterial. The combination of MoS 2 and Cu-NPs could take their inherent advantages in their properties to enhance the adsorption capacity, conductivity, as well as electrocatalytic activity, resulting in performance improvement in the determination of CAP.…”

Bio-AgNPs-based electrochemical nanosensors for the sensitive determination of 4-nitrophenol in tomato samples: the roles of natural plant extracts in physicochemical parameters and sensing performance

“…The high increase of the MP-AgNPs volume caused the increase in the thickness of the modifier layer on the electrode surface, which not only hindered the electron transfer within the electrode and the access of the electrolyte to the electrode surface but also led to the easy peeling and breaking of the working electrode during operation. 31 Thus, the optimized value of MP-AgNPs volume was proposed to be 12 μL for the next electrochemical measurements.…”

Insight into the Influence of Analyte Molecular Structure Targeted on MoS2-GO-Coated Electrochemical Nanosensors

“…Many other modified electrodes based on graphene/carbon nanotubes, , gold nanoparticles, ,,, silver nanowire, polyaniline, , and molecularly imprinted film , have also been reported toward CLB and 4-NP detection. More particularly, in recent literature, MoS 2 and its combination with GO have been widely studied as high potential substances for electrode modification aiming to enhance the detectability of chemical residues. − With a large surface area, excellent conductivity, good chemical stability, and strong mechanical strength, GO promotes the accumulation of analyte molecules and long-term stability. Meanwhile, layered MoS 2 is considered a great electrocatalytic nanomaterial owing to a large number of active edge sites.…”