Tungsten trioxide nanowires decorated with iridium oxide nanoparticles as gas sensing material

Navarrete, Eric; Bittencourt, Carla; Umek, Polona; Cossement, Damien; Güell, Frank; Llobet, Eduard

doi:10.1016/j.jallcom.2019.152156

Cited by 14 publications

(5 citation statements)

References 24 publications

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“…Tungsten trioxide nanowires decorated with iridium oxide nanoparticles resulted in remarkable changes in the morphology and defects of tungsten oxide nanowires. Such a sensor was found to be sensitive towards ethanol, NH 3 , H 2 , H 2 S and NO 2 [344]. Tungsten oxide functionalized with gold or platinum nanoparticles was synthesized by Vallejos et al using a single-step method via aerosol-assisted chemical vapor deposition.…”

Section: Wo 3 -Based Sensor For No 2 Detectionmentioning

confidence: 99%

Tungsten-Based Catalysts for Environmental Applications

2021

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This review aims to give a general overview of the recent use of tungsten-based catalysts for wide environmental applications, with first some useful background information about tungsten oxides. Tungsten oxide materials exhibit suitable behaviors for surface reactions and catalysis such as acidic properties (mainly Brønsted sites), redox and adsorption properties (due to the presence of oxygen vacancies) and a photostimulation response under visible light (2.6–2.8 eV bandgap). Depending on the operating condition of the catalytic process, each of these behaviors is tunable by controlling structure and morphology (e.g., nanoplates, nanosheets, nanorods, nanowires, nanomesh, microflowers, hollow nanospheres) and/or interactions with other compounds such as conductors (carbon), semiconductors or other oxides (e.g., TiO2) and precious metals. WOx particles can be also dispersed on high specific surface area supports. Based on these behaviors, WO3-based catalysts were developed for numerous environmental applications. This review is divided into five main parts: structure of tungsten-based catalysts, acidity of supported tungsten oxide catalysts, WO3 catalysts for DeNOx applications, total oxidation of volatile organic compounds in gas phase and gas sensors and pollutant remediation in liquid phase (photocatalysis).

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Section: Wo 3 -Based Sensor For No 2 Detectionmentioning

confidence: 99%

Tungsten-Based Catalysts for Environmental Applications

2021

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“…However, 1.5 mg of palladium (II) acetylacetonate (Pd(C 5 H 7 O 2 ) 2 Sigma-Aldrich), in addition to the 50 mg of tungsten hexacarbonyl, was dissolved in acetone (15 mL) and methanol (5 mL) to obtain Pd-decorated WO 3 nanowires in a single-step AA-CVD process. This methodology had been employed previously to achieve tungsten oxide nanowires decorated with different noble metals such as Pd [18], Au [12,19], Pt [12,14,20], or Ir [21]. The AA-CVD growth conditions for achieving any of these noble metal-loaded WO 3 NWs (solvents, temperature, and growth duration) are very similar and compatible with the direct growth of such nanomaterials onto flexible polymeric substrates.…”

Section: Methodsmentioning

confidence: 99%

Performance of Flexible Chemoresistive Gas Sensors after Having Undergone Automated Bending Tests

Alvarado

Flor

Llobet

et al. 2019

Sensors

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Many sensors are developed over flexible substrates to be used as wearables, which does not guarantee that they will actually withstand being bent. This work evaluates the gas sensing performance of metal oxide devices of three different types, before and after having undergone automated, repetitive bending tests. These tests were aimed at demonstrating that the fabricated sensors were actually flexible, which cannot be taken for granted beforehand. The active layer in these sensors consisted of WO3 nanowires (NWs) grown directly over a Kapton foil by means of the aerosol-assisted chemical vapor deposition. Their response to different H2 concentrations was measured at first. Then, they were cyclically bent, and finally, their response to H2 was measured again. Sensors based on pristine WO3-NWs over Ag electrodes and on Pd-decorated NWs over Au electrodes maintained their performance after having been bent. Ag electrodes covered with Pd-decorated NWs became fragile and lost their usefulness. To summarize, two different types of truly flexible metal oxide gas sensor were fabricated, whereas a third one was not flexible, despite being grown over a flexible substrate following the same method. Finally, we recommend that one standard bending test procedure should be established to clearly determine the flexibility of a sensor considering its intended application.

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“…Se considera un óxido metálico semiconductor tipo n y exhibe una banda prohibida en un rango de 2.6 a 3.0 eV [9], [10]. Es un material polimórfico que cristaliza en diferentes fases dependiendo de la metodología de crecimiento y la temperatura; entre ellas están: monoclínica, triclínica, ortorrómbica y tetragonal [11], [12]. Puede presentar propiedades electrocrómicas, catalíticas y fotocatalíticas [13], [14], siendo estas utilizadas en diferentes aplicaciones como en la detección de gases, degradación de contaminantes orgánicos, fotocatálisis, dispositivos fotocromáticos, almacenamiento de energía, dispositivos optoelectrónicos, microelectrónica, memoria óptica, etcétera [15], [16], [17], [18].…”

Section: Introductionunclassified

Implementación de un sistema de depósito químico en fase vapor asistido por filamento caliente (HFCVD) para la obtención del semiconductor trióxido de tungsteno (WO3)

Juan-Almazán,

Álvarez Gómez,

López

2022

Científica

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Se obtuvieron polvos de trióxido de tungsteno (WO3) mediante un sistema de HFCVD (Hot Filament Chemical Vapor Deposition). Los polvos exhibieron tres diferentes coloraciones (azul rey, azul cielo y amarillo), debido al cambio del gas precursor usado (argón (Ar) o argón con vapor de agua (Ar+ H2O) o aire). Los polvos fueron evaluados por Difracción de Rayos-X (DRX) para la determinación de su estructura cristalina, su morfología fue observada mediante Microscopia Electrónica de Barrido (MEB), la composición química elemental se obtuvo por Espectroscopia de Energía Dispersiva (EDS). Por último, se analizaron las bandas de los enlaces presentes en el material con ayuda de Espectroscopia RAMAN. Estas técnicas lograron evidenciar la presencia del trióxido de tungsteno en los polvos obtenidos.

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Tungsten trioxide nanowires decorated with iridium oxide nanoparticles as gas sensing material

Cited by 14 publications

References 24 publications

Tungsten-Based Catalysts for Environmental Applications

Tungsten-Based Catalysts for Environmental Applications

Performance of Flexible Chemoresistive Gas Sensors after Having Undergone Automated Bending Tests

Implementación de un sistema de depósito químico en fase vapor asistido por filamento caliente (HFCVD) para la obtención del semiconductor trióxido de tungsteno (WO3)

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