Effect of synthesis route on the structural and morphological properties of WO3 nanostructures

Jamali, Mohaddeseh; Tehrani, Fatemeh Shariatmadar

doi:10.1016/j.mssp.2019.104829

Cited by 59 publications

(17 citation statements)

References 46 publications

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“…There are many processes available for producing WO 3 nanostructures, such as sol-gel, [29,30] spin coating, [31] electrospinning, [32] chemical bath evaporation, [33] electrodeposition, [34,35] sputtering, [36] and solvothermal, whether by conventional heating or assisted by microwave radiation. [22,[37][38][39] The latter has the advantage of being a fast synthesis process completing reactions in a few minutes, despite allowing the precise control of temperature, pressure, time, and microwave power, and thus guaranteeing well-defined and uniform structures with high purity.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast Microwave Synthesis of WO₃ Nanostructured Films for Solar Photocatalysis

Nunes

Fragoso

Freire

et al. 2021

Physica Rapid Research Ltrs

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Tungsten oxide (WO3) nanostructured films are synthesized under microwave radiation with synthesis times of 5 and 10 min, at 150 or 180 °C. This ultrafast synthesis route results in uniform and well‐crystallized WO3 nanostructured films fully covering the substrates. A plate‐like hierarchical structure is observed at 150 °C, and closely packed rectangular nanorods are formed at 180 °C. For both temperatures, the nanostructures self‐organize into larger flower‐like structures. The increase of the synthesis time from 5 to 10 min at 180 °C results in thicker films, reaching ≈4 μm. X‐ray diffraction (XRD) and Raman spectroscopy reveal that the films grow with the WO3 orthorhombic crystalline phase (o‐WO3·0.33H2O). Photoluminescence (PL) measurements are performed for all the films, and their optical bandgaps are estimated through diffuse reflectance spectroscopy. The WO3 films have their photocatalytic activity assessed from rhodamine B (RhB) degradation under solar radiation. The Mott–Schottky plots confirm the n‐type character of the films with the flat‐band potentials and electron concentrations being estimated for the best photocatalysts. This study associates the eco‐friendly, fast, and low‐cost aspects of the synthesis route to the production of highly photoactive materials, which can effectively contribute to environmental remediation.

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Section: Introductionmentioning

confidence: 99%

Ultrafast Microwave Synthesis of WO₃ Nanostructured Films for Solar Photocatalysis

Nunes

Fragoso

Freire

et al. 2021

Physica Rapid Research Ltrs

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“…As the temperature increases from 0 to 1700 K (melting point), WO 3 may exist in four different crystallographic structures: monoclinic, triclinic, orthorhombic and tetragonal. Among them, monoclinic is a standard structure with a space group P2 1 /n (Jamali and Tehrani, 2020;Rao, 2013;Guia et al, 2019). The crystallographic structure of WO 3 in the undistorted cubic phase is depicted in Figure 1, and different crystallographic symmetries of WO 3 are tabulated in Table 1.…”

Section: Structure Of Womentioning

confidence: 99%

Nanostructured WO₃ based gas sensors: a short review

Sriram

Parne

Vaddadi

et al. 2021

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Purpose This paper aims to focus on the basic principle of WO3 gas sensors to achieve high gas-sensing performance with good stability and repeatability. Metal oxide-based gas sensors are widely used for monitoring toxic gas leakages in the environment, industries and households. For better livelihood and a healthy environment, it is extremely helpful to have sensors with higher accuracy and improved sensing features. Design/methodology/approach In the present review, the authors focus on recent synthesis methods of WO3-based gas sensors to enhance sensing features towards toxic gases. Findings This work has proved that the synthesis method led to provide different morphologies of nanostructured WO3-based material in turn to improve gas sensing performance along with its sensing mechanism. Originality/value In this work, the authors reviewed challenges and possibilities associated with the nanostructured WO3-based gas sensors to trace toxic gases such as ammonia, H2S and NO2 for future research.

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“…In addition, there are different phases of WO 3, such as orthorhombic, monoclinic (m-WO 3 ), triclinic, tetragonal (t-WO 3 ), hexagonal (h-WO 3 ), etc., [ 23 , 24 , 25 , 26 , 27 ]. The structure of WO 3 prepared by these synthesis methods is mostly orthorhombic and monoclinic phase [ 23 , 28 , 29 ]. In this paper, a novel method was the preparation of the WO 3 layer on tungsten foil via direct oxidization at high temperatures.…”

Section: Introductionmentioning

confidence: 99%

Study of a Novel Electrochromic Device with Crystalline WO3 and Gel Electrolyte

Chen

Zhang

et al. 2022

Polymers

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Most ECDs are coated with an electrochromic material on the transparent conductive oxide (TCO) substrate. A novel electrochromic device (ECD), having a variable optical performance, was prepared by using tungsten foil as a substrate in this study. It was found that the WO3 discoloration layer, having a monoclinic phase crystalline structure made of 600 °C calcined, had optimum charge transmission performance with PADA gel polymer electrolyte. Ionic conductivity of PADA gel polymer electrolyte was 2.3 × 10−3 S cm−1 at −20 °C, and it was possible to help Li+ to implement embedding and extraction from WO3 even in low-temperature conditions. The colored time (tc) and the bleached time (tb) of the electrochromic device were 15 s and 26 s, and it showed yellowish-brown in the colored state and navy blue in the bleached state. The ECD (WO3-600) exhibited good cycle stability reach at least 150 times.

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Effect of synthesis route on the structural and morphological properties of WO3 nanostructures

Cited by 59 publications

References 46 publications

Ultrafast Microwave Synthesis of WO₃ Nanostructured Films for Solar Photocatalysis

Ultrafast Microwave Synthesis of WO₃ Nanostructured Films for Solar Photocatalysis

Nanostructured WO₃ based gas sensors: a short review

Study of a Novel Electrochromic Device with Crystalline WO3 and Gel Electrolyte

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Effect of synthesis route on the structural and morphological properties of WO3 nanostructures

Cited by 59 publications

References 46 publications

Ultrafast Microwave Synthesis of WO3 Nanostructured Films for Solar Photocatalysis

Ultrafast Microwave Synthesis of WO3 Nanostructured Films for Solar Photocatalysis

Nanostructured WO3 based gas sensors: a short review

Study of a Novel Electrochromic Device with Crystalline WO3 and Gel Electrolyte

Contact Info

Product

Resources

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Ultrafast Microwave Synthesis of WO₃ Nanostructured Films for Solar Photocatalysis

Ultrafast Microwave Synthesis of WO₃ Nanostructured Films for Solar Photocatalysis

Nanostructured WO₃ based gas sensors: a short review