Catalyst-free synthesis of tungsten oxide nanowires <i>via</i> thermal evaporation for fast-response electrochromic devices

Wang, Chih-Hao; Yen, Hsi-Kai; Yang, Shu-Meng; Lu, Kuo-Chang

doi:10.1039/d2ce01269c

Cited by 2 publications

(2 citation statements)

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“…The fabrication of WO 3 films for EC applications is achieved through various techniques including magnetron sputtering [ 20 , 21 , 22 , 23 , 24 ], thermal and electron beam evaporation [ 25 , 26 , 27 , 28 , 29 ], chemical vapor deposition (CVD) [ 30 , 31 ], sol-gel processes [ 32 , 33 , 34 , 35 ], and hydrothermal reactions [ 36 , 37 , 38 , 39 , 40 , 41 , 42 ]. Each method presents its own set of challenges regarding production costs, experimental conditions, and scalability.…”

Section: Introductionmentioning

confidence: 99%

Rapid Fabrication of Tungsten Oxide-Based Electrochromic Devices through Femtosecond Laser Processing

Wang,

Zhai,

2024

Micromachines

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The sol-gel method is a widely adopted technique for the preparation of tungsten trioxide (WO3) materials, favored for its cost-effectiveness and straightforward production procedures. However, this method encounters challenges such as prolonged annealing periods and limited flexibility in fabricating patterned WO3 films. This study introduces a novel approach that integrates femtosecond laser processing with the sol-gel method to enhance the fabrication of WO3 films. By adjusting polyvinylpyrrolidone (PVP) concentrations during sol-gel synthesis, precise control over film thickness and optimized film properties were achieved. The innovative technique significantly reduced the annealing time required to achieve an 80% transmittance rate from 90 min to 40 min, marking a 56% decrease. Laser processing increased the surface roughness of the films from Sa = 0.032 to Sa = 0.119, facilitating enhanced volatilization of organics during heat treatment. Additionally, this method improved the transmittance modulation of the films by 22% at 550 nm compared to unprocessed counterparts. This approach not only simplifies the manufacturing process but also enhances the optical efficiency of electrochromic devices, potentially leading to broader applications and more effective energy conservation strategies.

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Section: Introductionmentioning

confidence: 99%

Rapid Fabrication of Tungsten Oxide-Based Electrochromic Devices through Femtosecond Laser Processing

Wang,

Zhai,

2024

Micromachines

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“…Its potential applications have been extensively studied in the past decades. [1][2][3] Among the polymorphs of WO 3 , the most concerned phases are hexagonal phase (h-WO 3 ) and monoclinic phase (m-WO 3 ). 4 WO 3 with hexagonal or monoclinic phase has attracted special interest due to its rich chemical and physical properties and is an attractive candidate for photocatalytic applications under solar radiation.…”

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confidence: 99%

Vapor Deposition-Assisted Sulfurization Synthesis of S-doped WO₃ Nanorods and Their Enhanced Photoactivity

Liang¹,

Chen²

2023

J. Electrochem. Soc.

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The hydrothermally derived WO3 nanorods were doped with sulfur through a simple vapor deposition-assisted sulfurization process at 550 °C. By changing the sulfurization duration from 1 to 10 min, the sulfur doping contents in the WO3 nanorods are 1.49–3.27 at%. After sulfurization treatments, the microstructural analysis reveals a phase transition from hexagonal to monoclinic structure for the WO3 nanorods. Furthermore, the sulfurization treatments result in a rugged surface feature of the WO3 nanorods. Compared with the pristine WO3 nanorods, sulfur-doping altered the energy band gap of the S-doped WO3 nanorods. The marked red shift of the absorption edge of the WO3 nanorods occurred after sulfurization treatments. Among various S-doped WO3 photocatalysts, the S-doped WO3 nanorods with an optimal S content of 2.26 at% exhibit superior photoelectrochemical (PEC) properties. The results show that the photoactivity of WO3 nanorods can be tuned by adjusting sulfurization duration, and the sulfur-doped WO3 nanorods with an appropriate sulfur content are feasible in applications of photoexcited devices with high efficiency.

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Catalyst-free synthesis of tungsten oxide nanowires via thermal evaporation for fast-response electrochromic devices

Abstract: Tungsten oxide has drawn widespread attention due to its outstanding physical properties; however, high temperature, low pressure, and expansive catalyst have been challenging issues for synthesis of tungsten oxide nanowires....

Cited by 2 publications

References 37 publications

Rapid Fabrication of Tungsten Oxide-Based Electrochromic Devices through Femtosecond Laser Processing

Rapid Fabrication of Tungsten Oxide-Based Electrochromic Devices through Femtosecond Laser Processing

Vapor Deposition-Assisted Sulfurization Synthesis of S-doped WO₃ Nanorods and Their Enhanced Photoactivity

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Catalyst-free synthesis of tungsten oxide nanowires via thermal evaporation for fast-response electrochromic devices

Abstract: Tungsten oxide has drawn widespread attention due to its outstanding physical properties; however, high temperature, low pressure, and expansive catalyst have been challenging issues for synthesis of tungsten oxide nanowires....

Cited by 2 publications

References 37 publications

Rapid Fabrication of Tungsten Oxide-Based Electrochromic Devices through Femtosecond Laser Processing

Rapid Fabrication of Tungsten Oxide-Based Electrochromic Devices through Femtosecond Laser Processing

Vapor Deposition-Assisted Sulfurization Synthesis of S-doped WO3 Nanorods and Their Enhanced Photoactivity

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Vapor Deposition-Assisted Sulfurization Synthesis of S-doped WO₃ Nanorods and Their Enhanced Photoactivity