Highly sensitive detection of methyl parathion based on morning glory-like porous carbon nanosheets modified electrochemical sensor

In this work, we proposed a template-free synthesis strategy for the preparation of morning glory-like porous carbon nanosheets (MGPCS) with three-dimensional (3D) interconnected porous carbon structure, which was applied to modify the glassy carbon electrode (GCE) for the fabrication of methyl parathion (MP) electrochemical sensor (MGPCS/GCE). MGPCS was successfully prepared by a template-free synthesis strategy with sodium citrate as carbon source. Benefitting from the high-temperature thermal decomposition and acid treatment process, the sodium citrate-derived MGPCS sample presented 3D interconnected morning glory-like porous carbon structure with good electrical conductivity, which provided more efficient charge transfer channels. In particular, the morning glory-like surface morphology significantly increased the specific surface area and adsorption capacity of sensing electrode. Under the optimal conditions, the fabricated MGPCS/GCE sensor showed highly sensitive MP detection property with low limit of detection of 10.7 nM (Linear MP concentration: 0.1-15 mu M). Moreover, the fabricated sensor presented good reproducibility, repeatability, stability, and selectivity. The good practical performance of the MGPCS/GCE sensor was confirmed by detecting the MP amount in apple juice and peach juice samples.

Automated summary

In this work, a template-free synthesis strategy was proposed to prepare morning glory-like porous carbon nanosheets (MGPCS) with a three-dimensional (3D) interconnected porous carbon structure, which were used to modify a glassy carbon electrode (GCE) for the fabrication of a methyl parathion (MP) electrochemical sensor (MGPCS/GCE). The MGPCS samples were successfully prepared from sodium citrate as the carbon source through high-temperature thermal decomposition and acid treatment, resulting in a 3D interconnected porous carbon structure with good electrical conductivity. The morning glory-like surface morphology increased the specific surface area and adsorption capacity of the sensing electrode, enabling highly sensitive MP detection with good reproducibility, stability, and selectivity. The sensor's practical performance was demonstrated by detecting MP in apple juice and peach juice samples.