Preparation and room temperature NO 2 -sensing performances of n-porous silicon/n-WO 3 nanowires heterojunction

Yan, Wenjun; Hu, Ming; Liang, Jiran; Wang, Dengfeng; Wei, Yanzhao; Zhang, Weiyi; Qin, Yuxiang

doi:10.1016/j.materresbull.2016.06.040

Cited by 16 publications

(2 citation statements)

References 40 publications

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“…WO3 could be elaborated by different techniques such as: chemical vapor deposition [10,13], spray pyrolysis [14], sol gel [15], electrodeposition [16] and atomic layer deposition (ALD) [17]. In the literature, WO3 used in gas sensors has been reported in different forms as nanowires [18][19], nanoparticles [20], thin films [21] permitting the detection of different gases: nitrogen dioxide (NO2) [20][21], hydrogen sulfide (H2S) [22], ozone (O3) [23], hydrogen [24], ethanol [24]. The WO3-based sensor response at an operating temperature is depending strongly on the substrate [21] and the microstructure features [25].…”

Section: Introductionmentioning

confidence: 99%

Study of n-WO3/p-porous silicon structures for gas-sensing applications

Mhamdi

Zaghouani²,

Fiorido

et al. 2020

J Mater Sci: Mater Electron

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In this work, we report on the gas sensing properties of n-WO3/p-porous silicon (PS) structures. Nanostructured WO3 films are deposited by simple chemical method via dip-coating of PS in tungsten hexachloride solution.The morphological and structural properties of the elaborated structures were investigated using Atomic Force Microscope (AFM), Raman and Fourier Transform Infrared (FTIR) Spectrometers. The NO2-sensing performances of the sensor were measured at different operating temperatures ranging from room temperature to 250 °C, different NO2 concentrations and different time exposure. The sensor showed a p-type semiconducting behavior which probably owning to the strong effect of the hetero-junction between the n-WO3 nanoparticles and p-porous silicon substrate. The obtained results confirm the suitability of these structures to detect low NO2 concentrations up to 1 ppm at moderate temperatures. These sensors exhibit fast response and recovery times.

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Section: Introductionmentioning

confidence: 99%

Study of n-WO3/p-porous silicon structures for gas-sensing applications

Mhamdi

Zaghouani²,

Fiorido

et al. 2020

J Mater Sci: Mater Electron

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“…Tungsten oxides are one of the most intensively investigated metal oxides due to their promising properties in the field of catalysis [1,2], photocatalysis [3][4][5][6], electrochromism [7][8][9], photochromism [10] or gas sensing [3,[11][12][13][14]. Tungsten oxides can be prepared in many ways, such as wet chemical processes [10], hydro-or solvothermal [6,[15][16][17] or chemical solution routes [5], electrospinning [18], spray pyrolysis [19] or annealing [20].…”

Section: Introductionmentioning

confidence: 99%

Effect of Different Anions Upon the WO₃ Morphology and Structure

Nagyné-Kovács

Malik

Szenkovits

et al. 2019

j nanosci nanotechnol

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In this study the effects of various anions (SO4 2-, ClO4and PO4 3-) were investigated on the hydrothermal treatment of WO3 from Na2WO4 and HCl at 180 and 200 °C. The products were analyzed by XRD and SEM. With the usage of SO4 2the obtained product was hexagonal (h-) WO3 in the form of nanorods at both temperatures. Applying ClO4resulted in a mixture of WO3•0.33 H2O and small amount of m-WO3 at 180 °C and pure WO3•0.33 H2O at 200 °C. The morphology was consisted of cuboid shapes arranged into spherical structures at 180 °C and longitudinal ones at 200 °C. By the application of PO4 3no product formed at either temperature. Using the combination of SO4 2-, and ClO4the product was h-WO3 at both 180 and 200 °C with rod-like crystals; thus, the effect of ClO4was overdominated by the SO4 2ions. Utilization of PO4 3together with SO4 2-, and/or ClO4resulted again in no product, meaning that adding PO43to the reaction mixture completely blocks the hydrothermal formation of solid products by forming water soluble phosphotungstic acids.

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