MOF@PEDOT Composite Films for Impedimetric Pesticide Sensors

Global Challenges

Wolfgang Knoll¹  Omar Azzaroni²  Matías Rafti²  Luciano D. Sappia²  Jimena S. Tuninetti²  Marcelo Ceolín² 

[1] CEST – Competence Center for Electrochemical Surface Technologies Konrad Lorenz Strasse 24 3430 Tulln Austria;Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas Departamento de Química Facultad de Ciencias Exactas Universidad Nacional de La Plata CONICET, CC 16 Suc. 4 La Plata B1904DPI Argentina;

关键词: conductive polymers;    imazalil;    impedance spectroscopy;    metal–organic frameworks;    PEDOT;    pesticide sensors;   

DOI  :  10.1002/gch2.201900076

来源: DOAJ

【 摘 要 】

Abstract Due to its deleterious effects on health, development of new methods for detection and removal of pesticide residues in primary and derived agricultural products is a research topic of great importance. Among them, imazalil (IMZ) is a widely used post‐harvest fungicide with good performances in general, and is particularly applied to prevent green mold in citrus fruits. In this work, a composite film for the impedimetric sensing of IMZ built from metal‐organic framework nanocrystallites homogeneously distributed on a conductive poly(3,4‐ethylene dioxythiophene) (PEDOT) layer is presented. The as‐synthetized thin films are produced via spin‐coating over poly(ethylene terephtalate (PET) substrate following a straightforward, cost‐effective, single‐step procedure. By means of impedance spectroscopy, electric transport properties of the films are studied, and high sensitivity towards IMZ concentration in the range of 15 ppb to 1 ppm is demonstrated (featuring 1.6 and 4.2 ppb limit of detection, when using signal modulus and phase, respectively). The sensing platform hereby presented could be used for the construction of portable, miniaturized, and ultrasensitive devices, suitable for pesticide detection in food, wastewater effluents, or the assessment of drinking‐water quality.

【 授权许可】

Unknown