General Synthesis of Single‐Crystal Tungstate Nanorods/Nanowires: A Facile, Low<b>‐</b>Temperature Solution Approach

Yu, Shu‐Hong; Liu, B.; Mo, Maosong; Huang, Jiaxing; Liu, X.-M.; Qian, Yi

doi:10.1002/adfm.200304373

Cited by 449 publications

(313 citation statements)

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“…Transition metal tungstates are important inorganic materials that are studied and applied widely in many fields [133]. Among these, Ag 2 WO 4 has attracted considerable attention because of their potential applications in fields as ionic conductivity [134], photocatalysis [135], sensors [136], microbial agents [137], photoluminescence properties [137,138].…”

Section: α-Ag 2 Womentioning

confidence: 99%

Effects of surface stability on the morphological transformation of metals and metal oxides as investigated by first-principles calculations

et al. 2015

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Morphology is a key property of materials. Owing to their precise structure and morphology, crystals and nanocrystals provide excellent model systems for joint experimental and theoretical investigations into surface-related properties. Faceted polyhedral crystals and nanocrystals expose well-defined crystallographic planes depending on the synthesis method, which allow for thoughtful investigations into structure-reactivity relationships under practical conditions. This feature article introduces recent work, based on the combined use of experimental findings and first-principles calculations, to provide deeper knowledge of the electronic, structural, and energetic properties controlling the morphology and the transformation mechanisms of different metals and metal oxides: Ag, anatase TiO 2 , BaZrO 3 , and α-Ag 2 WO 4 . According to the Wulff theorem, the equilibrium shapes of these systems are obtained from the values of their respective surface energies. These investigations are useful to gain further understanding of how to achieve morphological control of complex three-dimensional crystals by tuning the ratio of the surface energy values of the different facets. This strategy allows the prediction of possible morphologies for a crystal and/or nanocrystal by controlling the relative values of surface energies.

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Section: α-Ag 2 Womentioning

confidence: 99%

Effects of surface stability on the morphological transformation of metals and metal oxides as investigated by first-principles calculations

et al. 2015

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“…Several synthesis methods are used in the preparation of FeWO 4 nanocrystals, but the conventional hydrothermal (CH) method has most often been employed and reported in the literature. [27][28][29][30] However, the CH method has some inconveniences, such as a long time period (typically one-half to several days) because of slow heat transfer due to the conduction and convection transport mechanism and high electric power usage (over a thousand watts). The solution to these problems is the microwave-hydrothermal (MH) method; this method facilitates the attainment of this oxide material in a shorter time and with lower energy consumption 31 which is possible due to efficient internal heating (in-core volumetric heating) by direct coupling of microwave irradiation with solvent molecules, ions and hydroxides in the reaction mixture.…”

Section: Introductionmentioning

confidence: 99%

Effect of partial preferential orientation and distortions in octahedral clusters on the photoluminescence properties of FeWO4 nanocrystals

et al. 2012

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“…4,[13][14][15] In particular, the relationship between morphology and gas sensing properties has been well established. 4,16,17 Tungsten-based oxides are an important class of materials that display wide potential functional properties, [18][19][20] speci-cally the silver tungstate (Ag 2 WO 4 ) compound, which can exhibit three different structures: a-orthorhombic, b-hexagonal, and g-cubic. [21][22][23][24][25] Recently, our research group reported a detailed study of the synthesis, structural and optical properties of hexagonal nanorod-like elongated a-Ag 2 WO 4 nanocrystals obtained by different methods.…”

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A novel ozone gas sensor based on one-dimensional (1D) α-Ag₂WO₄ nanostructures

et al. 2014

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aThis paper reports on a new ozone gas sensor based on a-Ag 2 WO 4 nanorod-like structures. Electrical resistance measurements proved the efficiency of a-Ag 2 WO 4 nanorods, which rendered good sensitivity even for a low ozone concentration (80 ppb), a fast response and a short recovery time at 300 C, demonstrating great potential for a variety of applications.Metal semiconducting oxides have drawn the interest of many researchers due to their wide range of applications, especially as gas sensing materials. 1-5 Among them, one-dimensional (1-D) semiconductor nanostructures have been proposed as very interesting materials, especially as gas sensor devices.6-12 It is well known that several technological applications of nanostructured materials are directly related to the morphology, particle size, crystalline phase and activity of specic crystalline planes strictly dependent on synthesis methods. 4,[13][14][15] In particular, the relationship between morphology and gas sensing properties has been well established. 4,16,17Tungsten-based oxides are an important class of materials that display wide potential functional properties, 18-20 speci-cally the silver tungstate (Ag 2 WO 4 ) compound, which can exhibit three different structures: a-orthorhombic, b-hexagonal, and g-cubic.21-25 Recently, our research group reported a detailed study of the synthesis, structural and optical properties of hexagonal nanorod-like elongated a-Ag 2 WO 4 nanocrystals obtained by different methods. 26-28Ozone (O 3 ) is an oxidizing gas used in many technological applications in different areas, such as the food industry, drinking-water treatment, medicine, microelectronic cleaning processes, and others.29,34-39 For example, ozone has been employed as a powerful drinking-water disinfectant and oxidant. 34,35,40 On the other hand, when the ozone level in an atmosphere exceeds a certain threshold value, the exposure to this gas becomes hazardous to human health and can cause serious health problems (e.g. headache, burning eyes, respiratory irritation and lung damage).34,41 The European Guidelines (2002/3/EG) recommend avoiding exposure to ozone levels above 120 ppb.41 Such arguments support the requirement for the determination and continuous monitoring of ozone levels. 3,29,41Gas sensing properties are evaluated in terms of operating temperature, sensitivity, response time, recovery time and stability.29-33 SnO 2 , In 2 O 3 and WO 3 compounds have been considered the most promising ozone gas sensors. 29-33To the best of our knowledge, to date the gas sensing properties of a-Ag 2 WO 4 nanocrystals have never been evaluated.Here, we report the sensing properties of 1-D a-Ag 2 WO 4 nanorod-like structures obtained by the microwave-assisted hydrothermal (MAH) method.42-46 Because of such properties, nanorods are potential candidates for practical applications as ozone gas sensors.The crystalline phase of the as-obtained a-Ag 2 WO 4 sample was analyzed by X-ray diffraction measurement and all reec-tions were indexed to an orthorhombic struc...

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General Synthesis of Single‐Crystal Tungstate Nanorods/Nanowires: A Facile, Low‐Temperature Solution Approach

Cited by 449 publications

References 82 publications

Effects of surface stability on the morphological transformation of metals and metal oxides as investigated by first-principles calculations

Effects of surface stability on the morphological transformation of metals and metal oxides as investigated by first-principles calculations

Effect of partial preferential orientation and distortions in octahedral clusters on the photoluminescence properties of FeWO4 nanocrystals

A novel ozone gas sensor based on one-dimensional (1D) α-Ag₂WO₄ nanostructures

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General Synthesis of Single‐Crystal Tungstate Nanorods/Nanowires: A Facile, Low‐Temperature Solution Approach

Cited by 449 publications

References 82 publications

Effects of surface stability on the morphological transformation of metals and metal oxides as investigated by first-principles calculations

Effects of surface stability on the morphological transformation of metals and metal oxides as investigated by first-principles calculations

Effect of partial preferential orientation and distortions in octahedral clusters on the photoluminescence properties of FeWO4 nanocrystals

A novel ozone gas sensor based on one-dimensional (1D) α-Ag2WO4 nanostructures

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A novel ozone gas sensor based on one-dimensional (1D) α-Ag₂WO₄ nanostructures