Low temperature CO sensitive nanostructured WO3 thin films doped with Fe

Ahsan, Mohammad; Tesfamichael, Tuquabo; Ionescu, Mihail; Bell, John; Motta, Nunzio

doi:10.1016/j.snb.2011.11.038

Cited by 80 publications

(24 citation statements)

References 41 publications

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“…1 Tungsten oxide (WO 3 ), a popular n-type semiconductor with a relatively wide band gap of 2.6 eV, for its sensitive dependence of electrical resistance on exposed atmosphere, is found to be an excellent chemical sensor material. [2][3][4][5][6][7][8][9][10][11][12][13][14] In fact, it has exhibited an excellent response to a variety of poisonous, explosive and volatile organic compounds (VOCs) including NO x , 2-4 H 2 S, 5-6 CO, 7 H 2 , 8 ethanol, [9][10][11] acetone, [12][13][14] etc. Consider the assembly of 0D nanoparticle, WO 3 hollow nanospheres provide high surface area for chemical reaction and porous structure for effective gas diffusion and therefore exhibit better sensor performance than the bulk WO 3 .…”

Section: Introductionmentioning

confidence: 99%

Ag Nanoparticle-Sensitized WO₃ Hollow Nanosphere for Localized Surface Plasmon Enhanced Gas Sensors

Yao

Yin

et al. 2016

ACS Appl. Mater. Interfaces

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Ag nanoparticle (NP)-sensitized WO3 hollow nanospheres (Ag-WO3-HNSs) are fabricated via a simple sonochemical synthesis route. It is found that the Ag-WO3-HNS shows remarkable performance in gas sensors. Field-emission scanning electron microscope (FE-SEM) and transmission electron microscope (TEM) images reveal that the Agx-WO3 adopts the HNS structure in which WO3 forms the outer shell framework and the Ag NPs are grown on the inner wall of the WO3 hollow sphere. The size of the Ag NPs can be controlled by adjusting the addition amount of WCl6 during the reaction. The sensor Agx-WO3 exhibits extremely high sensitivity and selectivity toward alcohol vapor. In particular, the Ag(15nm)-WO3 sensor shows significantly lower operating temperature (230 °C), superior detection limits as low as 0.09 ppb, and faster response (7 s). Light illumination was found to boost the sensor performance effectively, especially at 405 and 900 nm, where the light wavelength resonates with the absorption of Ag NPs and the surface oxygen vacancies of WO3, respectively. The improved sensor performance is attributed to the localized surface plasmon resonance (LSPR) effect.

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Section: Introductionmentioning

confidence: 99%

Ag Nanoparticle-Sensitized WO₃ Hollow Nanosphere for Localized Surface Plasmon Enhanced Gas Sensors

Yao

Yin

et al. 2016

ACS Appl. Mater. Interfaces

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“…Since the radius of Fe 3+ is almost similar to that of W 6+ , a small distortion in the crystal lattice is observed to the WO 3 doped with Fe. In this case a small shift in the diffraction peaks is present and a number of defects in the film could also be produced, making this film a better candidate for a gas detecting [22,42]. Likewise, the W 6+ is octahedral coordinated with O 2− , and in the crystal of iron oxide the field stabilization energy of Fe 3+ is higher for octahedral orientation than for tetrahedral orientation.…”

Section: Resultsmentioning

confidence: 99%

Structural, Morphological, and Optical Properties of Iron Doped WO3 Thin Film Prepared by Pulsed Laser Deposition

2020

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The iron doped tungsten-oxide (Fe and WO3) thin film with different morphology and crystalline structures were obtained for different substrate temperatures at the oxygen pressure of 14.66 Pa. The Fe-doped WO3 films were deposited by pulsed laser deposition (PLD). The influence of the substrate temperature on the surface and on the crystalline phases of the films was studied. The XRD (X-ray diffraction) analysis indicates the changing in the crystalline phases from γ-monoclinic to a mixture of γ-monoclinic and hexagonal phases dependent on the temperature of annealing and as-grown films. Related to the as-grown and annealing films conditions, the SEM (scanning electron microscopy) shows a change in the image surface from nanoneedles, to nanoporous, and further to long nanowires and broad nanobands. Energy-dispersive X-ray spectroscopy (EDX) shows the elemental composition of the Fe-doped WO3 film as-grown and after annealing treatment. Raman spectroscopy presented the main vibration mode of the Fe-doped WO3 thin film. The optical energy bandgap of the films is decreasing as the substrate temperature increases.

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“…In the development of gasand/or VOC-sensors, metal oxides such as TiO 2 , SnO 2 , WO 3 , and ZnO are widely used as sensing components of analytical signal transduction systems, because of their high sensitivity and stability [2,3]. Among many other oxides, tungsten (VI) oxide (WO 3 ) is a very attractive material due to its relative chemical stability, robustness, inherent electrical conductivity, and good sensitivity towards various gaseous materials including many VOCs [4][5][6]. Various WO 3 -based structures are also used in lithium-ion batteries [7] and solar energy conversion systems [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Selectivity of Tungsten Oxide Synthesized by Sol-Gel Method Towards Some Volatile Organic Compounds and Gaseous Materials in a Broad Range of Temperatures

et al. 2020

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In this research, the investigation of sensing properties of non-stoichiometric WO3 (WO3−x) film towards some volatile organic compounds (VOC) (namely: Methanol, ethanol, isopropanol, acetone) and ammonia gas are reported. Sensors were tested at several temperatures within the interval ranging from a relatively low temperature of 60 up to 270 °C. Significant variation of selectivity, which depended on the operational temperature of sensor, was observed. Here, the reported WO3/WO3–x-based sensing material opens an avenue for the design of sensors with temperature-dependent sensitivity, which can be applied in the design of new gas- and/or VOC-sensing systems that are dedicated for the determination of particular gas- and/or VOC-based analyte concentration in the mixture of different gases and/or VOCs, using multivariate analysis of variance (MANOVA).

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Low temperature CO sensitive nanostructured WO3 thin films doped with Fe

Cited by 80 publications

References 41 publications

Ag Nanoparticle-Sensitized WO₃ Hollow Nanosphere for Localized Surface Plasmon Enhanced Gas Sensors

Ag Nanoparticle-Sensitized WO₃ Hollow Nanosphere for Localized Surface Plasmon Enhanced Gas Sensors

Structural, Morphological, and Optical Properties of Iron Doped WO3 Thin Film Prepared by Pulsed Laser Deposition

Selectivity of Tungsten Oxide Synthesized by Sol-Gel Method Towards Some Volatile Organic Compounds and Gaseous Materials in a Broad Range of Temperatures

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Low temperature CO sensitive nanostructured WO3 thin films doped with Fe

Cited by 80 publications

References 41 publications

Ag Nanoparticle-Sensitized WO3 Hollow Nanosphere for Localized Surface Plasmon Enhanced Gas Sensors

Ag Nanoparticle-Sensitized WO3 Hollow Nanosphere for Localized Surface Plasmon Enhanced Gas Sensors

Structural, Morphological, and Optical Properties of Iron Doped WO3 Thin Film Prepared by Pulsed Laser Deposition

Selectivity of Tungsten Oxide Synthesized by Sol-Gel Method Towards Some Volatile Organic Compounds and Gaseous Materials in a Broad Range of Temperatures

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Ag Nanoparticle-Sensitized WO₃ Hollow Nanosphere for Localized Surface Plasmon Enhanced Gas Sensors

Ag Nanoparticle-Sensitized WO₃ Hollow Nanosphere for Localized Surface Plasmon Enhanced Gas Sensors