Electrochromic properties of tungsten oxide films prepared by sparking method using external electric field

Thongpan, Winai; Louloudakis, D.; Pooseekheaw, Porntipa; Kumpika, Tewasin; Kantarak, Ekkapong; Panthawan, Arisara; Tuantranont, Adisorn; Thongsuwan, Wiradej; Singjai, Pisith

doi:10.1016/j.tsf.2019.04.010

Cited by 14 publications

(8 citation statements)

References 29 publications

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“…The porosity structure of films, which was the highlight of our sparking method, regularly collapsed during a high-temperature annealing process due to the film crystallization 13 , 14 , as shown in the TVA sample (Fig. 2 d).…”

Section: Resultsmentioning

confidence: 89%

“…However, post-annealed process was required for films crystallization, oxidation, and strong interaction between nanoparticles that limits the application for large-scale manufacturing with simplicity and cost-effectiveness. In addition, film’s mesopores was destroyed by agglomeration of particle in the annealing process 13 , 14 . The novel design to improve the sparking method need immediate further study.…”

Section: Introductionmentioning

confidence: 99%

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Effect of magnetic field on improvement of photocatalytic performance of V2O5/TiO2 nanoheterostructure films prepared by sparking method

Pooseekheaw

Thongpan

Kantarak

et al. 2022

Sci Rep

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Our porous V2O5/TiO2 nanoheterostructure films (with a Ti/V atomic ratio of 1:1) were fabricated via a single-step sparking method using a strong magnetic field (0.5 T) without annealing requirement for the first time. We found that the magnetic flux arrangement has effect on film crystallization, unique morphology, large specific surface area, and surprisingly controllable phase structure of the films. An amorphous TV film was transformed to the TiO2 (anatase/rutile) phase (for TVN) and V2O5–VO2 mixed-phase (for TVH) without destroying the mesopores from an annealing process. Moreover, the TVH sample able to improve the degradation rate up to 270% compared with pre-annealed TV films and up to 30% with post-annealed (400 °C) TVA films. In this paper, the influence of magnetic flux arrangement on structural, morphological, optical, and photocatalytic properties of prepared sample have been investigated and reported.

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Section: Resultsmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Effect of magnetic field on improvement of photocatalytic performance of V2O5/TiO2 nanoheterostructure films prepared by sparking method

Pooseekheaw

Thongpan

Kantarak

et al. 2022

Sci Rep

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“…In this work, we aim to synthesize novel Cu-Fe oxides composite lms by a one-step sparking process. This process has been developed in our lab which can prepare small, uniform particles, high porous lms, and determine the composite ratio [18][19][20][21][22][23][24][25][26]. Moreover, the sparking process requires neither complicated steps nor special equipment, cheap, fast, and non-toxic.…”

Section: Introductionmentioning

confidence: 99%

Copper-Iron Oxide: A Highly Effective Photocatalyst Than TiO2 Prepared by One-Step Sparking Process

Panthawan

Jumrus

Sanmuangmoon

et al. 2021

Preprint

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Copper-iron (Cu-Fe) oxide composite films were successfully deposited on quartz substrate by a facile sparking process. The nanoparticles were deposited on the substrate after sparking off the Fe and Cu tips with different ratios and were then annealed at different temperatures. The network particles was observed after annealed the film at 700°C. Meanwhile, XRD and SAED patterns of the annealed films at 700°C consisted of a mixed phase of CuO, γ-Fe2O3, CuFe2O4 and CuFe2O. The film with a lowest energy band gap (Eg) of 2.56 eV was observed after anneal at 700°C. Interestingly, the optimum ratio and annealing temperature show highly photocatalytic activity than annealed TiO2 at 500 and 700°C. This is a novel photocatalyst which can be replace TiO2 for photocatalytic applications in the future.

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“…Currently, an increasing amount of attention has been concentrated on energy saving in buildings for the reason that the energy used for these is in excess of 30% of the consumption of the total energy 2 of 13 in the word, as a matter of fact [1]. It is worth mentioning that it is the transition metal oxides that are the fascinating semiconducting materials which possess a variety of properties, applications and functions [2].…”

Section: Introductionmentioning

confidence: 99%

Effect of the Ammonium Tungsten Precursor Solution with the Modification of Glycerol on Wide Band Gap WO3 Thin Film and Its Electrochromic Properties

et al. 2020

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Tungsten trioxide (WO3) is a wide band gap semiconductor material, which is commonly not only used, but also investigated as a significant electrochromic layer in electrochromic devices. WO3 films have been prepared by inorganic and sol-gel free ammonium tungstate ((NH4)2WO4), with the modification of glycerol using the spin coating technique. The surface tension, the contact angle and the dynamic viscosity of the precursor solutions demonstrated that the sample solution with a 25% volume fraction of glycerol was optimal, which was equipped to facilitate the growth of WO3 films. The thermal gravimetric and differential scanning calorimetry (TG-DSC) analysis represented that the optimal sample solution transformed into the WO3 range from 220 °C to 300 °C, and the transformation of the phase structure of WO3 was taken above 300 °C. Fourier transform infrared spectroscopy (FT-IR) spectra analysis indicated that the composition within the film was WO3 above the 300 °C annealing temperature, and the component content of WO3 was increased with the increase in the annealing temperature. The X-ray diffraction (XRD) pattern revealed that WO3 films were available for the formation of the cubic and monoclinic crystal structure at 400 °C, and were preferential for growing monoclinic WO3 when annealed at 500 °C. Atomic force microscope (AFM) images showed that WO3 films prepared using ammonium tungstate with modification of the glycerol possessed less rough surface roughness in comparison with the sol-gel-prepared films. An ultraviolet spectrophotometer (UV) demonstrated that the sample solution which had been annealed at 400 °C obtained a high electrochromic modulation ability roughly 40% at 700 nm wavelength, as well as the optical band gap (Eg) of the WO3 films ranged from 3.48 eV to 3.37 eV with the annealing temperature increasing.

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Electrochromic properties of tungsten oxide films prepared by sparking method using external electric field

Cited by 14 publications

References 29 publications

Effect of magnetic field on improvement of photocatalytic performance of V2O5/TiO2 nanoheterostructure films prepared by sparking method

Effect of magnetic field on improvement of photocatalytic performance of V2O5/TiO2 nanoheterostructure films prepared by sparking method

Copper-Iron Oxide: A Highly Effective Photocatalyst Than TiO2 Prepared by One-Step Sparking Process

Effect of the Ammonium Tungsten Precursor Solution with the Modification of Glycerol on Wide Band Gap WO3 Thin Film and Its Electrochromic Properties

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