Autor segons l'article: Sharafeldin I; Garcia-Rios S; Ahmed N; Alvarado M; Vilanova X; Allam NK
Departament: Enginyeria Electrònica, Elèctrica i Automàtica
Autor/s de la URV: Vilanova Salas, Javier
Paraules clau: Transition metal decoration Gas sensor Carbon nanotubes
Resum: © 2020 Elsevier Ltd. Herein, we report a toxic gas detector based on an array of metal-decorated multiwalled carbon nanotubes (M-MWCNTs) sensors. The room temperature (20 °C) response of the sensors array towards NO2, H2S, NH3, and CO gases was investigated. The MWCNTs were decorated with transition metals, Pt, Ti, Ag, Ru, and Cu to enhance the sensitivity and selectivity of the carbon nanotubes to the toxic gases. The M-MWCNTs powders were deposited on gold electrodes and printed on flexible Kapton sheets to form the sensors array. CO exhibited the lowest resistance change response for all six sensors (five transition metal-decorated MWCNTs sensors and one pristine MWCNTs-based sensor), with the Ag-MWCNTs sensor exhibiting the highest response of 0.047-100 ppm CO. The Ag-MWCNTs also revealed the relatively highest sensitivity of 0.944 upon exposure to 100 ppm NH3. The Cu-MWCNTs sensor showed the highest sensitivity of 1.75 upon exposure to 10 ppm H2S, while the Pt-MWCNTs sensor showed the highest response of 1.96 upon exposure to 10 ppm NO2. A unique response pattern was generated for each gas that can be used for its identification. The experimental results were also compared to our previously reported density functional theory (DFT) calculations, revealing the same order of resistance change, thereby validating the use of DFT as a tool to predict the interaction properties and providing an in-depth understanding of the reducing/oxidizing gas electron transfer mechanisms.
Àrees temàtiques: Waste management and disposal Química Process chemistry and technology Pollution Materiais Matemática / probabilidade e estatística Interdisciplinar Farmacia Engineering, environmental Engineering, chemical Engenharias iv Engenharias iii Engenharias ii Engenharias i Ciências ambientais Ciências agrárias i Ciência de alimentos Chemical engineering (miscellaneous) Biotecnología Astronomia / física
Accès a la llicència d'ús: https://creativecommons.org/licenses/by/3.0/es/
Adreça de correu electrònic de l'autor: xavier.vilanova@urv.cat
Identificador de l'autor: 0000-0002-6245-7933
Data d'alta del registre: 2024-07-27
Versió de l'article dipositat: info:eu-repo/semantics/acceptedVersion
Enllaç font original: https://www.sciencedirect.com/science/article/abs/pii/S2213343720308836
URL Document de llicència: https://repositori.urv.cat/ca/proteccio-de-dades/
Referència a l'article segons font original: Journal Of Environmental Chemical Engineering. 9 (1):
Referència de l'ítem segons les normes APA: Sharafeldin I; Garcia-Rios S; Ahmed N; Alvarado M; Vilanova X; Allam NK (2021). Metal-decorated carbon nanotubes-based sensor array for simultaneous detection of toxic gases. Journal Of Environmental Chemical Engineering, 9(1), -. DOI: 10.1016/j.jece.2020.104534
DOI de l'article: 10.1016/j.jece.2020.104534
Entitat: Universitat Rovira i Virgili
Any de publicació de la revista: 2021
Tipus de publicació: Journal Publications