Autor segons l'article: Sola-Penafiel, Nil; Lopez-Rodriguez, Gema; Sindreu-Cladera, Pau; Navarrete, Eric; Ramos-Castro, Juan; Martin, Isidro; Manyosa, Xavier; Bermejo, Sandra; Dominguez-Pumar, Manuel
Departament: Enginyeria Electrònica, Elèctrica i Automàtica
Autor/s de la URV: Llobet Valero, Eduard / Navarrete Gatell, Èric
Paraules clau: Trapped charge control Sliding control Sigma-delta modulation Sigma-delta modulatio Sensors Pd-mos capacitors Palladium Oxidatio Ionizing-radiation Hydrogen sensor Dielectric charge Closed-loop compensation
Resum: Hydrogen monitoring with reliable, fast and cheap sensors is crucial to fully exploit the potential of this gas as an energy vector. One of the most appealing technologies for hydrogen sensing is based on MOS capacitors with palladium gate (Pd) made of nanoparticles, which acting as a catalyst for H2 promotes its dissociation. The generated atoms are then injected into the dielectric shifting the C(V) curve. In this work, we show that the use of active controls of trapped charge in dielectrics can radically accelerate the response time of palladium MOS capacitors as H2 sensors. The repeatability of the sensing is also improved, reducing significantly temporal drifts. The control strategy is based on second order sigma-delta modulation, implementing a discrete-time sliding mode control. Results show that the horizontal displacement of the C(V) curve of the capacitors can be cancelled out in real time by the application of voltage waveforms generated by the controls. Consequently, when exposed to hydrogen, a quasi-constant state operation of the capacitors is created, allowing a radical improvement of the time response as hydrogen sensors.
Àrees temàtiques: Surfaces, coatings and films Spectroscopy Química Odontología Nutrição Metals and alloys Medicina ii Medicina i Materials chemistry Materiais Interdisciplinar Instruments & instrumentation Instrumentation Farmacia Engenharias iv Engenharias iii Engenharias ii Engenharias i Electronic, optical and magnetic materials Electrochemistry Electrical and electronic engineering Educação física Educação Economia Condensed matter physics Ciências biológicas iii Ciências biológicas ii Ciências biológicas i Ciências ambientais Ciências agrárias i Ciência de alimentos Ciência da computação Chemistry, analytical Biotecnología Biodiversidade Astronomia / física Analytical chemistry
Accès a la llicència d'ús: https://creativecommons.org/licenses/by/3.0/es/
Adreça de correu electrònic de l'autor: eric.navarrete@urv.cat eric.navarrete@urv.cat eduard.llobet@urv.cat
Identificador de l'autor: 0000-0001-6164-4342
Data d'alta del registre: 2024-12-28
Versió de l'article dipositat: info:eu-repo/semantics/publishedVersion
Referència a l'article segons font original: Sensors And Actuators B-Chemical. 426 136959-
Referència de l'ítem segons les normes APA: Sola-Penafiel, Nil; Lopez-Rodriguez, Gema; Sindreu-Cladera, Pau; Navarrete, Eric; Ramos-Castro, Juan; Martin, Isidro; Manyosa, Xavier; Bermejo, Sandra (2025). Accelerating hydrogen sensing with Pd-MOS capacitors using active controls of trapped charge. Sensors And Actuators B-Chemical, 426(), 136959-. DOI: 10.1016/j.snb.2024.136959
URL Document de llicència: https://repositori.urv.cat/ca/proteccio-de-dades/
Entitat: Universitat Rovira i Virgili
Any de publicació de la revista: 2025
Tipus de publicació: Journal Publications
Repositori URV