Design of Au@WO3 core−shell structured nanospheres for ppb-level NO2 sensing

Zhao, Sikai; Shen, Yanbai; Zhou, Pengfei; Zhong, Xiangxi; Han, Cong; Zhao, Qiang; Wei, Dezhou

doi:10.1016/j.snb.2018.11.142

Cited by 199 publications

(68 citation statements)

References 55 publications

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“…Thus, the development of NO 2 gas sensors with high sensitivity and low detect limitation is urgently necessary. At present, metal oxide semiconductors with various nanostructures, such as SnO 2 [3][4][5], ZnO [6,7], WO 3 [8,9], and TiO 2 [10], have been well investigated to detect NO 2 owing to their low cost, simple operation, and nontoxic nature. Among them, tungsten oxide, a n-type semiconductor with wide bandgap (2.6-3.2 eV), has been considered as a promising sensing material for the detection of NO 2 because of its low cost, high sensitivity, and good repeatability [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…Triple-shelled WO 3 spheres synthesized by ultrasonic spray pyrolysis showed a large resistance (>1 GΩ) when exposed to NO 2 gas at low operating temperature [16]. A general strategy to solve this problem is surface functionalization with noble metals (Au, Ag, and Pt) [8,[17][18][19][20]. Gao's group reported Ag-loaded mesoporous WO 3 showed excellent response to NO 2 at 75 ℃ [17].…”

Section: Introductionmentioning

confidence: 99%

“…Gao's group reported Ag-loaded mesoporous WO 3 showed excellent response to NO 2 at 75 ℃ [17]. Recently, Zhao et al [8] reported Au@WO 3 core-shell nanospheres showed an improvement in NO 2 sensing performance in terms of sensitivity, response/ recovery rate, and detection limit at 100 ℃. However, the method is not always effective, because the noble metal particles tend to catalytic poisoning and noble metal modification increases the fabricating cost [21].…”

Section: Introductionmentioning

confidence: 99%

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Nanowires-assembled WO3 nanomesh for fast detection of ppb-level NO2 at low temperature

Liu

Ren

et al. 2020

J Adv Ceram

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Hierarchical WO 3 nanomesh, assembled from single-crystalline WO 3 nanowires, is prepared via a hydrothermal method using thiourea (Tu) as the morphology-controlling agent. Formation of the hierarchical architecture comprising of WO 3 nanowires takes place via Ostwald ripening mechanism with the growth orientation. The sensor based on WO 3 nanomesh has good electrical conductivity and is therefore suitable as NO 2 sensing material. The WO 3 nanomesh sensor exhibited high response, short response and recovery time, and excellent selectivity towards ppb-level NO 2 at low temperature of 160 ℃. The superior gas performance of the sensor was attributed to the high-purity hexagonal WO 3 with high specific surface area, which gives rise to enhanced surface adsorption sites for gas adsorption. The electron depletion theory was used for explaining the NO 2 -sensing mechanism by the gas adsorption/desorption and charge transfer happened on the surface of WO 3 nanomesh.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nanowires-assembled WO3 nanomesh for fast detection of ppb-level NO2 at low temperature

Liu

Ren

et al. 2020

J Adv Ceram

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“…For many years, metal oxide semiconductor (MOS) materials received considerable attention owing to their wide application in the fields of optic [8,9], energy [10,11], catalyst [12,13], and gas sensor [14,15,16]. Specifically in gas sensors, MOS has been considered as the most potential sensing materials in detecting various hazardous gases and has covered most of the monitoring of environmental pollutants [17,18].…”

Section: Introductionmentioning

confidence: 99%

Controllable Synthesis of Zn-Doped α-Fe2O3 Nanowires for H2S Sensing

et al. 2019

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One-dimensional Zn-doped α-Fe2O3 nanowires have been controllably synthesized by using the pure pyrite as the source of Fe element through a two-step synthesis route, including the preparation of Fe source solution by a leaching process and the thermal conversion of the precursor solution into α-Fe2O3 nanowires by the hydrothermal and calcination process. The microstructure, morphology, and surface composition of the obtained products were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. It was found that the formation process of α-Fe2O3 is significantly influenced by the introduction of Zn2+. The gas sensing measurements indicated that the sensor based on 1% Zn-doped α-Fe2O3 nanowires showed excellent H2S sensing properties at the optimum operating temperature of 175 °C. Notably, the sensor showed a low H2S detection limit of 50 ppb with a sensor response of 1.5. Such high-performance sensing would be ascribed to the one-dimensional structure and high specific surface area of the prepared 1% Zn-doped α-Fe2O3 nanowires, which can not only provide a large number of surface active sites for the adsorption and reaction of the oxygen and H2S molecules, but also facilitate the diffusion of the gas molecules towards the entire sensing materials.

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“…Tungsten trioxide (WO 3 ), as an important n -type semiconductor metal oxide with a wide band gap of 2.6~3.0 eV [1], is showing promising applications in a wide number of novel products, including photocatalytic [2], electrochromic devices [3], dye-sensitized solar cells [4], optical devices [5], field-emission displays [6], and gas sensors [7,8,9]. In particular, WO 3 is widely considered to be one of the most promising alternative candidate materials for the next-generation gas sensing devices [10,11].…”

Section: Introductionmentioning

confidence: 99%

Influence of Synthesis Conditions on Microstructure and NO2 Sensing Properties of WO3 Porous Films Synthesized by Non-Hydrolytic Sol–Gel Method

et al. 2018

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Nanostructured tungsten trioxide porous films were prepared by a non-hydrolytic sol–gel method following the inorganic route in which ethanol and PEG were used as the oxygen-donor and structure-directing reagent, respectively. The effects of aging time of the precursor solution, PEG content, and calcination temperature on the structure, morphology, and NO2 sensing properties of WO3 films were systematically investigated by using the techniques of X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, and gas sensing measurements. The results demonstrated that a series of WO3 films with different microstructures could be obtained by manipulating the synthesis parameters. Furthermore, a suitable synthesis condition of WO3 films for NO2 sensing application was determined.

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Design of Au@WO3 core−shell structured nanospheres for ppb-level NO2 sensing

Cited by 199 publications

References 55 publications

Nanowires-assembled WO3 nanomesh for fast detection of ppb-level NO2 at low temperature

Nanowires-assembled WO3 nanomesh for fast detection of ppb-level NO2 at low temperature

Controllable Synthesis of Zn-Doped α-Fe2O3 Nanowires for H2S Sensing

Influence of Synthesis Conditions on Microstructure and NO2 Sensing Properties of WO3 Porous Films Synthesized by Non-Hydrolytic Sol–Gel Method

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