基于锌掺杂碳点比色传感器的构建及其在硫脲可视化检测中的应用

Abstract Thiourea (TU) as a sulfur-containing organic compound is widely used in industrial agricultural and pharmaceutical fields.Although its acute toxicity is low long-term exposure may pose high biological and health risks and it has been classified as a Group 3 carcinogen by the International Union for Research on Cancer.There fore establishing a rapid and highly sensitive TU detection method is of great significance for environmental monitor ing and food safety.This study successfully synthesized zinc doped carbon dot nanomaterials (Zn CDs) using a onestep hydrothermal method.This material can directly catalyze the conversion of colorless substrate 3 3' 5 5'-tetra methylbenzidine (TMB) to blue oxidation product (oxTMB) under xenon lamp irradiation exhibiting excellent pho tocatalytic activity.Based on the absorbance and color changes induced by the inhibition of the photocatalytic reac tion by TU a colorimetric method with a wide linear range and low detection limit was established.Meanwhile smartphone-based color recognition was employed for quantitative detection of TU.Finally the proposed method was applied to the determination of TU in real water samples and the results demonstrated its good accuracy and feasibility.Keywords carbon dots zinc doping photocatalysis colorimetric sensing thiourea detection