Room-temperature fabrication of zeolitic imidazolate framework-8 nanoparticles combined with graphitized and carbonylated carbon nanotubes networks for the ultrasensitive gallic acid electrochemical detection

Gallic acid (GA) has important application value in several fields of foods, medicines, and chemical engineering. However, the excessive intake of GA may cause gastrointestinal discomfort and nerve damage. Herein, an economical room-temperature fabrication strategy was reported for the preparation of zeolitic imidazolate framework-8 (ZIF-8) nanoparticles combined with graphitized and carbonylated carbon nanotubes (GCMCN) networks, which were used to achieve the ultrasensitive electrochemical detection of GA. The GCMCN@ZIF-8 nanocomposite modified electrode realized an accurate and rapid analysis of GA (Linear concentration range: 0.1–20 μM, LOD: 4.77 nM). GCMCN networks with graphitization and carboxylation boosted the electrical conductivity of electrode modification layer and enhanced the electrochemical interface area between sensing electrode and electrolyte. ZIF-8 nanoparticles with more active interaction sites and high porosity possessed high adsorption capacity for GA molecules. The fabricated electrochemical sensing platform exhibited good GA quantitative analysis property in food samples (Recovery: 93.88–106.73 %, RSD: 1.04–3.73).