INIFTA   05425
INSTITUTO DE INVESTIGACIONES FISICO-QUIMICAS TEORICAS Y APLICADAS
Unidad Ejecutora - UE
artículos
Título:
MOF@PEDOT Composite Films for Impedimetric Pesticide Sensors
Autor/es:
CEOLÍN, MARCELO; AZZARONI, OMAR; SAPPIA, LUCIANO D.; KNOLL, WOLFGANG; TUNINETTI, JIMENA S.; RAFTI, MATÍAS
Revista:
Global Challenges
Editorial:
Wiley
Referencias:
Año: 2019
ISSN:
2056-6646
Resumen:
Due to its deleterious effects on health, development of new methodsfor detection and removal of pesticide residues in primary and derivedagricultural products is a research topic of great importance. Amongthem, imazalil (IMZ) is a widely used post-harvest fungicide with goodperformances in general, and is particularly applied to prevent green moldin citrus fruits. In this work, a composite film for the impedimetric sensingof IMZ built from metal-organic framework nanocrystallites homogeneouslydistributed on a conductive poly(3,4-ethylene dioxythiophene) (PEDOT) layeris presented. The as-synthetized thin films are produced via spin-coatingover 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 sensitivitytowards 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 modulusand phase, respectively). The sensing platform hereby presented couldbe used for the construction of portable, miniaturized, and ultrasensitivedevices, suitable for pesticide detection in food, wastewater effluents, or theassessment of drinking-water quality.