ZnO nanoplates surfaced-decorated by WO
                    <sub>3</sub>
                    nanorods for NH
                    <sub>3</sub>
                    gas sensing application

Nguyen, Dac Dien; Tho, Duc; Vu, Xuan Hien; Vuong, Dang Duc; Nguyen, Duc Chien

doi:10.1088/2043-6262/7/1/015004

Cited by 32 publications

(19 citation statements)

References 17 publications

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“…They suggested that the mesoporous structure allows for fast diffusion of gas molecules, resulting in high rates of gas adsorption and desorption. Nguyen et al [87], by a hydrothermal method, synthesized ZnO nanoplates made of single-crystal wurtzite structure with a thickness of 40 nm and 200 nm × 400 nm in lateral dimensions. The authors also prepared composites by mixing the synthesized ZnO nanoplates and WO 3 nanorods with different weight ratio.…”

Section: Ammoniamentioning

confidence: 99%

Two-Dimensional Zinc Oxide Nanostructures for Gas Sensor Applications

Leonardi

2017

Chemosensors

159

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Two-dimensional (2D) nanomaterials, due to their unique physical and chemical properties, are showing great potential in catalysis and electronic/optoelectronic devices. Moreover, thanks to the high surface to volume ratio, 2D materials provide a large specific surface area for the adsorption of molecules, making them efficient in chemical sensing applications. ZnO, owing to its many advantages such as high sensitivity, stability, and low cost, has been one of the most investigated materials for gas sensing. Many ZnO nanostructures have been used to fabricate efficient gas sensors for the detection of various hazardous and toxic gases. This review summarizes most of the research articles focused on the investigation of 2D ZnO structures including nanosheets, nanowalls, nanoflakes, nanoplates, nanodisks, and hierarchically assembled nanostructures as a sensitive material for conductometric gas sensors. The synthesis of the materials and the sensing performances such as sensitivity, selectivity, response, and recovery times as well as the main influencing factors are summarized for each work. Moreover, the effect of mainly exposed crystal facets of the nanostructures on sensitivity towards different gases is also discussed.

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Section: Ammoniamentioning

confidence: 99%

Two-Dimensional Zinc Oxide Nanostructures for Gas Sensor Applications

Leonardi

2017

Chemosensors

159

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“…The procedure has been reported in ref. [15]. The crystal structure of ZnO nanoplates was identified using Bruker-AXS (Siemens) D5005 with CuKα radiation (λ = 1.54065 Å) at a scanning rate of 0.03 • /2 s within the 2θ range of 30-70 • .…”

Section: Methodsmentioning

confidence: 99%

“…These studies were conducted at room temperature. A recent study reported the influence of UV light combined with thermal energy on sensing materials [13][14][15]. However, research on this field is limited.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of ethanol-sensing properties of ZnO nanoplates by UV illumination

et al. 2019

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ZnO nanoplates with hexagonal wurtzite structure were synthesized by hydrothermal treatment. The average dimension and average thickness of the plates were ∼200 × 400 and 40 nm, respectively. ZnO nanoplates were deposited on Pt-interdigitated electrodes for the fabrication of gas-sensing devices. The ethanol-sensing properties of the devices were investigated in the dark vs. ultraviolet (UV) illumination. Under the UV illumination, the optimal operating temperature of the devices can be reduced from 237 to 164 • C and the response of the device was increased from 2.8 to 8.5 towards 1500 ppm ethanol vapour.

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“…The massive researches showed that ZnO had the faster response and recovery time, higher sensitivity toward NO x gas, and the study on ZnO‐based gas sensors attracted the researchers largely. Hitherto, the researchers have synthesized ZnO with different morphology, including nanorods, nanosheets, nanotubes, nanoparticles, nanoplates, nanofilms, and so forth . The different morphology has the considerable impact on the gas sensing performance of MOS gas sensors.…”

Section: Introductionmentioning

confidence: 99%

Enhanced NO_x Gas Sensing Properties of Ordered Mesoporous WO₃/ZnO Prepared by Electroless Plating

Han

Wang

et al. 2017

Adv Materials Inter

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NO x gas, and the study on ZnO-based gas sensors attracted the researchers largely. Hitherto, the researchers have synthesized ZnO with different morphology, including nanorods, [9] nanosheets, [10] nanotubes, [11] nanoparticles, [12] nanoplates, [13] nanofilms, [14] and so forth. [15][16][17][18][19][20][21][22][23][24] The different morphology has the considerable impact on the gas sensing performance of MOS gas sensors. A large number of researches indicated that the doped-ZnO materials showed the better performance. The doping components mainly included SnO 2 , WO 3 , Cr 2 O 3 , Co 3 O 4 , Ni, noble metal, etc. [9][10][11][25][26][27][28][29][30][31][32][33][34] Renitta and Vijayalakshmi [30] fabricated a novel nanowhiskers array of Cr incorporated ZnO on ITO substrate by spray pyrolysis technique, and the material exhibited high sensing response to hydrogen gas at room temperature. Liu et al. [28] synthesized Co 3 O 4 /ZnO nanocomposites by an easy wet-chemistry route, and the obtained nanocomposite showed enhanced gas sensing response (about 46%) to 100 ppm ethanol at 170 °C. Tamaekong et al. [31] successfully produced ZnO nanoparticles doped with 0.2-2 at% Pt by flame spray pyrolysis technique. They found that the 0.2 at% Pt/ZnO sensing film showed the highest sensitivity (2.9%) and the fastest response time (≈10 s) to 1000 ppm CO at 350 °C.WO 3 -based gas sensors were widely studied recent years. Zeng et al. [35] prepared a porous WO 3 sensor by anodic oxidation of DC magnetron sputtered metallic tungsten (W) film on alumina substrate. The prepared WO 3 sensor achieved the maximum response toward NO 2 at a low operating temperature of 150 °C. You et al. [36] successfully synthesized the nanosheets assembled hierarchical WO 3 hollow microspheres by sintering acid-treated CaWO 4 hollow microspheres precursor at 500 °C, and the response to 40 ppb NO 2 was about 16 at 75 °C. Vuong et al. [37] studied the gas sensing mechanism of a 1D highly porous WO 3 nanowire gas sensor, which was based on adsorption-desorption kinetics of oxidizing gases. However, the gas sensing properties of WO 3 /ZnO composite were rarely reported. Tesfamichael et al. [32] prepared W-doped ZnO thin films by magnetron sputtering method. The response time of the W-doped ZnO thin film was 195 s toward 5 ppm NO 2 at 150 °C. Naik et al. [23] synthesized a kind of composite MOS sensor array based on tungsten oxide (WO 3 ) and zinc oxide (ZnO) using a simple mechanical mixing method. The highest response of the composite was 148 toward 800 ppb NO 2 at 300 °C.A kind of novel n-n combined ordered mesoporous WO 3 /ZnO (OM-WO 3 / ZnO) sensor are successfully fabricated in this study. A soft-template method is used to synthesize the ordered mesoporous ZnO matrix. Surfaces of the ZnO matrix are innovatively modified using silane coupling agent (mark as: OM-ZnO-Si), and then a layer of WO 3 film is assembled on the surfaces of the OM-ZnO-Si by chemical plating method for the first time, and the OM-WO 3 /ZnO material is obtained. The prepared OM-WO 3 ...

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ZnO nanoplates surfaced-decorated by WO ₃ nanorods for NH ₃ gas sensing application

Cited by 32 publications

References 17 publications

Two-Dimensional Zinc Oxide Nanostructures for Gas Sensor Applications

Two-Dimensional Zinc Oxide Nanostructures for Gas Sensor Applications

Enhancement of ethanol-sensing properties of ZnO nanoplates by UV illumination

Enhanced NO_x Gas Sensing Properties of Ordered Mesoporous WO₃/ZnO Prepared by Electroless Plating

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ZnO nanoplates surfaced-decorated by WO 3 nanorods for NH 3 gas sensing application

Cited by 32 publications

References 17 publications

Two-Dimensional Zinc Oxide Nanostructures for Gas Sensor Applications

Two-Dimensional Zinc Oxide Nanostructures for Gas Sensor Applications

Enhancement of ethanol-sensing properties of ZnO nanoplates by UV illumination

Enhanced NOx Gas Sensing Properties of Ordered Mesoporous WO3/ZnO Prepared by Electroless Plating

Contact Info

Product

Resources

About

ZnO nanoplates surfaced-decorated by WO ₃ nanorods for NH ₃ gas sensing application

Enhanced NO_x Gas Sensing Properties of Ordered Mesoporous WO₃/ZnO Prepared by Electroless Plating