Large-scale synthesis of hydrated tungsten oxide 3D architectures by a simple chemical solution route and their gas-sensing properties

Huang, Jiarui; Xu, Xiaojuan; Gu, Cuiping; Yang, Min; Yu, Meng; Liu, Jinhuai

doi:10.1039/c1jm11292a

Cited by 112 publications

(66 citation statements)

References 38 publications

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“…5c) shows instead nanoparticles with smaller dimensions and broader size distribution (average length of 150-250 nm, average width of 100-200 nm and thickness of about 50-100 nm). According to the literature [28][29][30] and as depicted in the inset schematic models, the WO 3 nanocrystals have two {002} surfaces (top and bottom), and lateral {020} and {200} surfaces.…”

Section: Resultsmentioning

confidence: 99%

“…In order to investigate the effect of the crystal facets on the sensing response, WO 3 nanocrystals with tailored morphology and denite prominent surfaces were synthesized by previously reported hydrothermal reactions [28][29][30] and used to produce lms. In parallel, to study the inuence of the porous structure and of the surface area, we prepared macroporous WO 3 inverted opal lms according to the above mentioned one-step procedure 21 and hierarchical tungsten oxide layers by an innovative one-step dual-templating (block copolymer Pluronic P123 and colloidal PMMA microspheres) strategy which guarantees the simultaneous presence of macropores and mesopores.…”

Section: à2mentioning

confidence: 99%

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Surface interaction of WO3 nanocrystals with NH3. Role of the exposed crystal surfaces and porous structure in enhancing the electrical response

et al. 2014

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We report on the surface interaction between NH 3 and WO 3 nanoparticles having different exposed surfaces or different porous structure, to identify the relative importance of exposed crystal surfaces, porous architecture, and specific surface area in the oxide sensing properties. WO 3 nanocrystals with tailored morphology and definite prominent surfaces were synthesized by hydrothermal reactions. In parallel, inverted opal macroporous WO 3 films have been prepared by a one-step sol-gel procedure, and WO 3 hierarchical layers have been obtained by an innovative one-step dual-templating strategy which leads to macropores and mesopores simultaneously. The performances of WO 3 samples in NH 3 sensing, indicate that high-energy surfaces result in a significant improvement of the electrical response.Enhanced porous structure and high surface area are not enough to produce high electrical response, while their synergistic combination with tailored crystal faceting appears effective. XPS survey performed on shape controlled WO 3 nanocrystals demonstrated that, upon interaction with NH 3 , oxidized nitrogen atoms represent the prevalent species on the surface of rectangular (WO 3 -RE) nanocrystals with highly exposed high-energy {020} and {002} facets. Conversely, in the case of rectangular platelets and square platelets (WO 3 -RS) with very low surface area of high-energy surfaces, N-H surface groups are predominant. These results suggest that {020} and {002} crystal surfaces provide privileged reactive sites for ammonia oxidation and therefore they play a key role in driving the sensing properties of the WO 3 layers.

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Section: Resultsmentioning

confidence: 99%

Section: à2mentioning

confidence: 99%

Surface interaction of WO3 nanocrystals with NH3. Role of the exposed crystal surfaces and porous structure in enhancing the electrical response

et al. 2014

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“…A rich variety of WO 3 nanostructures such as nanoporous films [18], nanowires [14,19,22,23], nanowire network [22], nanosheets [4,17,19,20], and nanotrees [25] have been successfully synthesized. The WO 3 nanosheets are usually prepared following the liquid-phase synthesis routes such as hydrothermal process and solution reaction [1,4,17,21,26]. For the liquid-phase synthesis routes, the product is generally hydrated WO 3 [1,4,17,20,26,27], which can be converted into anhydrous phase after subsequent annealing.…”

Section: Introductionmentioning

confidence: 99%

“…The WO 3 nanosheets are usually prepared following the liquid-phase synthesis routes such as hydrothermal process and solution reaction [1,4,17,21,26]. For the liquid-phase synthesis routes, the product is generally hydrated WO 3 [1,4,17,20,26,27], which can be converted into anhydrous phase after subsequent annealing. However, for the current synthesis methods, the thickness of the prepared nanosheets cannot be well controlled and exceeds 20 nm generally [4,20,26].…”

Section: Introductionmentioning

confidence: 99%

“…For the liquid-phase synthesis routes, the product is generally hydrated WO 3 [1,4,17,20,26,27], which can be converted into anhydrous phase after subsequent annealing. However, for the current synthesis methods, the thickness of the prepared nanosheets cannot be well controlled and exceeds 20 nm generally [4,20,26]. Furthermore, for inducing the formation of nanosheets, capping agents are required during the reaction processes.…”

Section: Introductionmentioning

confidence: 99%

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Potential-mediated growth of ultrathin hydrated tungsten oxide nanosheets with high electrochemical activity from amorphous precursor nanofibers

et al. 2014

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Morphology and size control is of great importance for enhancing the properties of nanomaterials. In this paper, a novel method to prepare hydrated WO 3 (HWO) nanosheets with controlled thickness is reported. The HWO nanosheets were grown from the precursor nanofibers with amorphous structure containing W and O, which were obtained by heating the electrospun ammonium metatungstate/polyvinyl pyrrolidone composite nanofibers at 400°C. The growth of the HWO nanosheets was carried out by immersing the above precursor nanofibers in H 2 SO 4 solution during which electrical potential was applied onto the precursor nanofibers to mediate the nanosheet growth. The morphology of the products and nanosheet thickness can be well controlled by changing the applied potential. Under appropriate potential, ultrathin HWO nanosheets with thickness well below 10 nm were radially grown from the precursor nanofibers. The ultrathin HWO nanosheets exhibit high electrochemical activity for hydrogen oxidation with the current density reaching 44.6 mA/cm 2 , which is much higher than the values reported for WO 3 and commercial 20 wt% Pt/C catalysts.

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Au Modified Hollow Cube Sn‐MOF Derivatives for Highly Sensitive, Great Selective, and Stable Detection of n‐Butanol at Room Temperature

Cui

Tian

Xiao

et al. 2023

Adv Materials Technologies

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At present, there are still few gas sensors for detecting n‐butanol at room temperature. It is worth noting that detecting target gas at room temperature is beneficial to reduce energy consumption and prolong the lifetime of sensors. In this work, different molar ratios Au nanoparticles modified SnO2 derived from Sn‐MOF hollow cubes (Au‐SnO2) are synthesized by the coprecipitation method. The Au‐SnO2 has higher specific surface area than pure SnO2, which is conducive to improving gas sensing. The 0.7% Au‐SnO2 exhibit excellent sensing performances of 240% toward 100 ppm n‐butanol and the actual detection interval is 200 ppb–500 ppm under the room temperature. Meanwhile, DFT calculations reveal that Au‐SnO2 gas sensor has wonderful selectivity to n‐butanol at room temperature. The enhancement of n‐butanol sensing performance is also related to the “catalytic sensitization” effect and the “electron sensitization” effect triggered driven by Au NPs. It is hoped this Au‐SnO2 sensing material with such great gas response, selectivity and low detection limit will help detect n‐butanol at room temperature to lower energy consumption.

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Large-scale synthesis of hydrated tungsten oxide 3D architectures by a simple chemical solution route and their gas-sensing properties

Cited by 112 publications

References 38 publications

Surface interaction of WO3 nanocrystals with NH3. Role of the exposed crystal surfaces and porous structure in enhancing the electrical response

Surface interaction of WO3 nanocrystals with NH3. Role of the exposed crystal surfaces and porous structure in enhancing the electrical response

Potential-mediated growth of ultrathin hydrated tungsten oxide nanosheets with high electrochemical activity from amorphous precursor nanofibers

Au Modified Hollow Cube Sn‐MOF Derivatives for Highly Sensitive, Great Selective, and Stable Detection of n‐Butanol at Room Temperature

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