A sensitive electrochemical sensor modified with multi‐walled carbon nanotubes doped molecularly imprinted silica nanospheres for detecting chlorpyrifos

Abstract

A highly sensitive and convenient electrochemical sensor, based on surface molecularly imprinted polymers and multiwalled carbon nanotubes, was successfully developed to detect chlorpyrifos in real samples. In order to solve the problems like uneven shapes, poor size accessibility, and low imprinting capacity, the layer of the molecularly imprinted polymer was prepared on the surface of silica nanospheres. Moreover, the doping of multiwalled carbon nanotubes greatly improved the electrical properties of developed sensor. Under the optimal conductions, the electrochemical response of the sensor is linearly proportional to the concentration of chlorpyrifos in the range of 5.0 × 10−12‐5.0 × 10−8 mol/L with a low detection limit of 8.1 × 10−13 mol/L. The prepared sensor exhibited multiple advantages such as low cost, simple preparation, convenient use, excellent selectivity, and good reproducibility. Finally, the prepared sensor was successfully used to detect chlorpyrifos in vegetable and fruit.

Molecularly Imprinted Polymers for the Detection of Chlorpyrifos (an Organophosphate Pesticide)

“…MWCNTs are being used to increase the sensing characteristics due to their Excellent conductivity. Huang et al (2020) synthesized MIP layer on the surface of silica nano-spheres to overcome the problem of uneven shapes, pore size, and low imprinting capacity. The prepared sensor was best for the detection of chlorpyrifos in vegetables and fruits (Huang et al, 2020).…”

The Use of Aptamers and Molecularly Imprinted Polymers in Biosensors for Environmental Monitoring: A Tale of Two Receptors

“…This catalytic function of the nanozyme can be switched on through the presence of chlorpyrifos, which causes the aptamer to elute off the nanozyme. In comparison, a recent report demonstrated the use of a MIP based electrochemical sensor for the detection of chlorpyrifos [60]. Multi-walled carbon nanotube doped molecularly imprinted silica nanospheres were synthesized and applied onto a glassy carbon electrode and achieved a detection limit of 100 fM.…”

A Novel and Highly Sensitive Reduced Graphene Oxide Modified Electrochemical Sensor for the Determination of Chlorpyrifos in Real Sample

“…However, despite the accuracy and high sensitivity of these methods, they come with certain drawbacks including high costs, time-consuming processes such as pre-concentration, and bulky devices that are not suitable for fieldwork. Therefore, a simpler, faster and, cost-efficient method is required to detect CPF (Huang et al, 2020). Electrochemical methods were employed for simple, fast and cost-efficient determination of CPF (Al-Meqbali et al, 1998;Manisankar et al, 2005;Pelit et al, 2011;Kumaravel et al, 2015;Sreedar et al,2015;Fischer et al J.,2016;Melo et al,2018;Joshi et al, 2020) Being one of the most prominent elements of the periodic table, carbon has a total of five allotropes including fullerene, carbon nanotube, graphene, graphite, and diamond.…”