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Modeling the Conductivity Response to NO(2) Gas of Films Based on MWCNT Networks

This work proposes a model describing the dynamic behavior of sensing films based on functionalized MWCNT networks in terms of conductivity when exposed to time-variable concentrations of NO(2) and operating with variable working temperatures. To test the proposed model, disordered networks of MWCNT...

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Detalles Bibliográficos
Autores principales: Fort, Ada, Mugnaini, Marco, Panzardi, Enza, Lo Grasso, Anna, Al Hamry, Ammar, Adiraju, Anurag, Vignoli, Valerio, Kanoun, Olfa
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8309647/
https://www.ncbi.nlm.nih.gov/pubmed/34300463
http://dx.doi.org/10.3390/s21144723
Descripción
Sumario:This work proposes a model describing the dynamic behavior of sensing films based on functionalized MWCNT networks in terms of conductivity when exposed to time-variable concentrations of NO(2) and operating with variable working temperatures. To test the proposed model, disordered networks of MWCNTs functionalized with COOH and Au nanoparticles were exploited. The model is derived from theoretical descriptions of the electronic transport in the nanotube network, of the NO(2) chemisorption reaction and of the interaction of these two phenomena. The model is numerically implemented and then identified by estimating all the chemical/physical quantities involved and acting as parameters, through a model fitting procedure. Satisfactory results were obtained in the fitting process, and the identified model was used to further the analysis of the MWCNT sensing in dynamical conditions.