Impact of annealing on the electrodeposited WS2 thin films: Enhanced photodegradation of coupled semiconductor

Jana, Sumanta; Bera, Pulakesh; Chakraborty, Biswajit; Mitra, Bibhas Chandra; Mondal, Anup

doi:10.1016/j.apsusc.2014.07.151

Cited by 33 publications

(22 citation statements)

References 29 publications

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“…4 shows the UveVis spectrum of FeS 2 thin film. Using the Tauc's relation [(ahn) 1/n ¼ A (hn-E g ) [46] the band gap energy is calculated (where hn is the energy of the incident photon, A is a constant and n is the exponent, the value of which is determined by the type of electronic transition causing the absorption and can take the value ½ or 2 depending upon whether the transition is direct or indirect respectively). The direct bandgap (E g ) is calculated to be~2.24 eV by extrapolating the linear part of the (ahy) 2 vs hy curve in Fig.…”

Section: Resultsmentioning

confidence: 99%

Electrochemical synthesis of FeS2 thin film: An effective material for peroxide sensing and terephthalic acid degradation

Jana

Mondal

Tripathi

et al. 2015

Journal of Alloys and Compounds

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Section: Resultsmentioning

confidence: 99%

Electrochemical synthesis of FeS2 thin film: An effective material for peroxide sensing and terephthalic acid degradation

Jana

Mondal

Tripathi

et al. 2015

Journal of Alloys and Compounds

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“…The presence of two phases in the annealed films grown with various S/W molar ratios were identified using X-ray diffraction studies, see Fig. 1 [19]. Shape, size, size distribution, phase, crystalline degree, and defects can play a role in the energy gaps of materials.…”

Section: Optical Analysismentioning

confidence: 99%

“…The basis of our knowledge only one report on the preparation of WS 2 /WO 3 thin films was available. Jana et al [19] have used electrodeposition technique to synthesize WS 2 thin films on ITO (indium tin oxide) glass substrate. Air annealing the WS 2 thin films at 450°C resulted a mix phase of WS 2 /WO 3 with better catalytic activity than other single phase thin films.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and characterization of nanostructural WS2/WO3 binary compound semiconductors prepared by the sulfurization of sprayed thin films

Adelifard

Salamatizadeh

Ketabi

2016

J Mater Sci: Mater Electron

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We have investigated the impact of sulfurization and changing the metal salt ratio ([s]/[w] = 6-24 at.%) in the precursor solution on the structural, morphological, optical, electrical and photoconductivity properties of WS 2 / WO 3 binary thin films grown on glass substrate by the spray pyrolysis technique. X-ray diffraction analysis showed that while the as-deposited samples present an amorphous nature, annealing these films in sulfur atmosphere generate a mix phase of WS 2 /WO 3 . FESEM study revealed the changes in surface morphology with increase in sulfur concentration in the spray solution. UV-Vis optical measurements analysis showed that these binary films have a relatively high absorption coefficient *2 9 10 4 -8 9 10 4 cm -1 in the visible spectrum with two distinct inflexions indicative of two transitions correspond to WS 2 /WO 3 phases in agreement with the XRD analysis. The electrical studies showed that all these samples have a p-type conductivity; and the resistivity and photoconductivity decreases with increasing the sulfur to tungsten molar ratio.

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“…Fortunately, the quantum confinement effects make it possible to increase the band gap of nanosized WS 2 significantly, which achieves the transfer of electrons from the conduction band of WS 2 to that of TiO 2 . Therefore, nanosized WS 2 can be regarded as an effective sensitizer to decorate high crystalline TiO 2 [7,8,12]. On the other hand, nanoparticles are inclined to agglomerate for its high surface activity in aqueous solution, resulting in reduced efficiency in the degradation of pollutant.…”

Section: Introductionmentioning

confidence: 99%

Preparation of titanium dioxide/tungsten disulfide composite photocatalysts with enhanced photocatalytic activity under visible light

Zheng

Zhang

Xiao

2015

Korean J. Chem. Eng.

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Titanium dioxide/tungsten disulfide (TiO 2 /WS 2 ) composite photocatalysts were fabricated via a one-step hydrothermal synthesis process, using TiCl 4 as titanium source and bulk WS 2 as sensitizer. The morphology, structure, specific surface area and optical absorption properties of the composite photocatalysts were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), X-ray powder diffraction (XRD), specific surface area analyzer and ultraviolet-visible diffuse reflection spectrum (UV-vis DRS), respectively. The photocatalytic activity of as-prepared photocatalysts was evaluated by the degradation of methyl orange (MO) under illumination of 500 W Xenon lamp. The results indicated that TiO 2 /WS 2 composite photocatalysts possessed excellent photocatalytic activity, and ~95% of the degradation rate for MO was reached when molar ratio of WS 2 to TiO 2 was 0.004 and the irradiation time was 60 min. Moreover, the carrier trapping experiment and fluorescence spectra showed that •O 2 − was the key component in the photocatalytic degradation process and O 2 was reduced to be •O 2 − by the electrons from the conduction band of TiO 2 and WS 2 for the degradation of MO.

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Impact of annealing on the electrodeposited WS2 thin films: Enhanced photodegradation of coupled semiconductor

Cited by 33 publications

References 29 publications

Electrochemical synthesis of FeS2 thin film: An effective material for peroxide sensing and terephthalic acid degradation

Electrochemical synthesis of FeS2 thin film: An effective material for peroxide sensing and terephthalic acid degradation

Fabrication and characterization of nanostructural WS2/WO3 binary compound semiconductors prepared by the sulfurization of sprayed thin films

Preparation of titanium dioxide/tungsten disulfide composite photocatalysts with enhanced photocatalytic activity under visible light

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