Ultrasensitive NO2 gas sensors using tungsten oxide nanowires with multiple junctions self-assembled on discrete catalyst islands via on-chip fabrication

Van, Phung Thi Hong; Dai, Do Duc; Duy, Nguyễn Văn; Hòa, Nguyễn Đức; Hiếu, Nguyễn Văn

doi:10.1016/j.snb.2015.12.054

Cited by 29 publications

(15 citation statements)

References 30 publications

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“…In most cases, for this purpose, the n-type semiconductors such as SnO 2 [14][15][16][17][18][19][20], ZnO [21][22][23][24][25][26], WO 3 [27][28][29][30][31][32], In 2 O 3 [33,34], and TiO 2 [35] are used traditionally. In recent years, the search of the materials, which would be capable to lower the detection limit of oxidizing gases, became more active.…”

Section: Novel Nanomaterials -Synthesis and Applicationsmentioning

confidence: 99%

Palladium (II) Oxide Nanostructures as Promising Materials for Gas Sensors

Samoylov¹,

Ryabtsev²,

Popov³

et al. 2018

Novel Nanomaterials - Synthesis and Applications

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One of the most important environment monitoring problems is the detection of oxidizing gases in the ambient air. Negative impact of noxious oxidizing gases (ozone and nitrogen oxides) on human health, sensitive vegetation, and ecosystems is very serious. For this reason, palladium (II) oxide nanostructures have been employed for oxidizing gas detection. Thin and ultrathin films of palladium (II) oxide were prepared by thermal oxidation at dry oxygen of previously formed pure palladium layers on polished poly-Al 2 O 3 , SiO 2 /Si (100), optical quality quartz, and amorphous carbon/KCl substrates. At ozone and nitrogen dioxide detection, PdO films prepared by oxidation at T = 870 K have demonstrated good values of sensitivity, signal stability, operation speed, and reproducibility of sensor response. In comparison with other materials, palladium (II) oxide thin and ultrathin films have some advantages at gas sensor fabrication. Firstly, for oxidizing gas detection, PdO films with p-type conductivity are more perspective than the material with n-type conductivity. Secondly, at ambient conditions, palladium (II) oxide is insoluble in water and does not react with it. These facts are favorable for the fabrication of gas detectors because they make possible to minimize the air humidity influence on PdO sensor response values. Thirdly, the synthesis procedure of PdO films is rather simple and is compatible with planar processes of microelectronic industry.

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Section: Novel Nanomaterials -Synthesis and Applicationsmentioning

confidence: 99%

Palladium (II) Oxide Nanostructures as Promising Materials for Gas Sensors

Samoylov¹,

Ryabtsev²,

Popov³

et al. 2018

Novel Nanomaterials - Synthesis and Applications

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“…1 These properties make WO 3 an ideal candidate for different applications such as electrochromic, 2 photochromic, 3 lithium batteries, 4 and gas sensors. 5,6 Moreover, it exhibits a wide band gap ranging from 2.7 to 3.6 eV, 7 and this oxide is rather complex and can crystallize in a number of different phases and crystals. 1,8,9 In the literature, numerous reports are available on the growth of WO 3 nanostructures in the form of nanoparticles, 10 thin films, 11 nanorods, 12 and nanowires.…”

Section: Introductionmentioning

confidence: 99%

Integration of VLS-Grown WO₃ Nanowires into Sensing Devices for the Detection of H₂S and O₃

et al. 2019

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The inspiration behind this research is the development of tungsten oxide (WO3) nanowires based, highly sensitive and selective sensing devices directly on the active sensing platform. WO3 one-dimensional nanowires were synthesized via the vapour-phase growth technique. This approach allows the production of well-aligned and uniform nanowires on alumina substrates with their diameter and length in the nanometer range. The morphological and structural properties of nanowires have been investigated by means of the field effect electron microscopy, grazing incidence X-ray diffraction, Raman spectroscopy, and X-ray photoelectron spectroscopy. Finally, the fabricated WO3 nanowire sensing devices and their gas sensing performance were investigated in the presence of different oxidizing and reducing gases (especially environmental gases) at different temperatures. The WO3 sensors demonstrate high performance toward H2S and O3 at the optimal working temperatures of 400 and 200 °C, respectively, with the detection limit in the ppb level.

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“…Tungsten oxides (WO 3− x ), a kind of special semiconductor metal oxide, has been captivating much attention due to their widespread potential applications in electrochromic devices, solar cells, supercapacitors, photocatalyst, and gas sensors . It is well known that the properties of a material usually closely rely on their aggregation form and microstructure .…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Synthesis of WO₃₋_x Quantum Dots and Bundle‐Like Nanowires Using a One‐Pot Template‐Free Solvothermal Strategy and Their Versatile Applications

Wang

et al. 2017

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Tungsten oxide (WO ), a new alternative to conventional semiconductor material, has attracted numerous attentions owning to its widespread potential applications. Various methods have been reported for the synthesis of WO nanostructures such as nanowires or nanodots. However, templates or surfactants are often required for the synthesis, which significantly complicate the process and hinder the broad applications. Herein, one-pot template/surfactant-free solvothermal method is proposed to synthesize the WO nanostructures including fluorescent quantum dots (QDs) and bundle-like nanowires simultaneously. The as-prepared WO QDs can be well dispersed in aqueous medium, exhibit excellent photoluminescent properties, and show an average size of 3.25 ± 0.25 nm as evidenced by transmission electron microscopy. Meanwhile, the diameter of the WO nanowires is found to be about 27.5 nm as manifested by the scanning electron microscope images. The generation mechanism for these two WO nanostructures are systematically studied and proposed. The WO QDs have been successfully applied in efficient fluorescent staining and specific ferric ion detection. Moreover, the WO nanowires can be utilized as effective dielectric materials for electromagnetic wave absorption.

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Ultrasensitive NO2 gas sensors using tungsten oxide nanowires with multiple junctions self-assembled on discrete catalyst islands via on-chip fabrication

Cited by 29 publications

References 30 publications

Palladium (II) Oxide Nanostructures as Promising Materials for Gas Sensors

Palladium (II) Oxide Nanostructures as Promising Materials for Gas Sensors

Integration of VLS-Grown WO₃ Nanowires into Sensing Devices for the Detection of H₂S and O₃

Simultaneous Synthesis of WO₃₋_x Quantum Dots and Bundle‐Like Nanowires Using a One‐Pot Template‐Free Solvothermal Strategy and Their Versatile Applications

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Ultrasensitive NO2 gas sensors using tungsten oxide nanowires with multiple junctions self-assembled on discrete catalyst islands via on-chip fabrication

Cited by 29 publications

References 30 publications

Palladium (II) Oxide Nanostructures as Promising Materials for Gas Sensors

Palladium (II) Oxide Nanostructures as Promising Materials for Gas Sensors

Integration of VLS-Grown WO3 Nanowires into Sensing Devices for the Detection of H2S and O3

Simultaneous Synthesis of WO3−x Quantum Dots and Bundle‐Like Nanowires Using a One‐Pot Template‐Free Solvothermal Strategy and Their Versatile Applications

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Product

Resources

About

Integration of VLS-Grown WO₃ Nanowires into Sensing Devices for the Detection of H₂S and O₃

Simultaneous Synthesis of WO₃₋_x Quantum Dots and Bundle‐Like Nanowires Using a One‐Pot Template‐Free Solvothermal Strategy and Their Versatile Applications