Novel Nitrate Ion-Selective Microsensor Fabricated by Means of Direct Ink Writing
Paré, Franc (Universitat Autònoma de Barcelona. Departament de Química)
Visús, Aida (Universitat Autònoma de Barcelona. Departament de Química)
Gabriel, Gemma (Institut de Microelectrònica de Barcelona)
Baeza Labat, Maria del Mar (Universitat Autònoma de Barcelona. Departament de Química)

Data:	2023
Resum:	In this work, the stability, electrical conductivity, and versatility of graphite-based inks were taken advantage of to fabricate a nitrate potentiometric sensor. One other key property that was exploited for the design of an ion-selective electrode was the hydrophobicity of graphite. This prevented the formation of a water layer between the solid contact and the polymeric selective membrane. Moreover, given the use of printing technologies for electrode fabrication, it was possible to easily miniaturize the sensors and achieve lower fabrication costs. In this article, a printed sensor, composed of a graphite working electrode and a Ag/AgCl reference electrode, is presented and thoroughly characterized. The working electrode was modified with a well-known PVC-ionophore membrane, and the reference electrode was protected with a PVB-NaCl saturated membrane. It showed almost-Nernstian sensitivity of −(55. 4 ± 0. 7) mV/dec to NO , stability of up to 25 days of operation, limit of detection of 0. 204 ± 0. 009 mM, and repeatability of 99. 02 % (N = 3). Coupled with its high selectivity compared with other anions, this low-cost, mass-producible sensor is a great alternative for environmental and industrial applications.
Ajuts:	Agencia Estatal de Investigación PID2021-126253OB-C21
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Publicat a:	Chemosensors, Vol. 11, Issue 3 (March 2023) , art. 174, ISSN 2227-9040

DOI: 10.3390/chemosensors11030174

12 p, 1.8 MB

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