Effect of V2O5 concentration on structural and optical properties of WO3 thin films prepared by RF magnetron sputtering

Meenakshi, M.; Gowthami, V.; Perumal, Packiyaraj; Sanjeeviraja, C.

doi:10.1063/1.4898257

Cited by 10 publications

(11 citation statements)

References 4 publications

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“…The relatively high value of band gap"can be caused by high degree"of non-stoichiometric disorders in the"film. These results were also close to the results in references [23,24].…”

Section: Optical Energy Gap (Eg)supporting

confidence: 92%

The Influence of RF power, pressure and substrate temperature on optical properties of RF Sputtered vanadium pentoxide thin films

Salman¹

2019

IJP

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The V2O5 films were deposited on glass substrates which produce using "radio frequency (RF)"power supply and Argon gas technique. The optical properties were investigated by, UV spectroscopy at "radio frequency" (RF) power ranging from 75 - 150 Watt and gas pressure, (0.03, 0.05 and 0.007 Torr), and substrate temperature (359, 373,473 and 573) K. The UV-Visible analysis shows that the average transmittance of all films in the range 40-65 %. When the thickness has been increased the transhumance was decreased from (65-40) %. The values of energy band gap were lowered from (3.02-2.9 eV) with the increase of thickness the films in relation to an increase in power, The energy gap decreased (2.8 - 2.7) eV with an increase in the pressure and substrate temperature respectively.

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“…The relatively high value of band gap"can be caused by high degree"of non-stoichiometric disorders in the"film. These results were also close to the results in references [23,24].…”

Section: Optical Energy Gap (Eg)supporting

confidence: 92%

The Influence of RF power, pressure and substrate temperature on optical properties of RF Sputtered vanadium pentoxide thin films

Salman¹

2019

IJP

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“…This may be due to the inadequate collision relaxation time of the atoms which lead to the lack of sufficient kinetic energy to an atom to settle down in an ordered phase to form a crystalline structure. [ 25 ] In addition, even after annealing the films at 500 °C we do not observe any diffraction peaks, which shows that the films are still in amorphous nature. When the films are further annealed at 1000 °C, the diffraction peaks of both Zn 2 SnO 4 and SnO 2 are observed.…”

Section: Resultsmentioning

confidence: 90%

Sputtering Power and Annealing Effects on the Properties of Zn₂SnO₄–SnO₂ Composite Thin Film for Pungent Smelling Gas (NH₃) Detection

Cynthia

Sivakumar

Sanjeeviraja

et al. 2020

Physica Status Solidi (a)

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Recently, metal oxide semiconductors have attracted the research community because of their highly appreciable optoelectronic properties, which made them more suitable for many device applications such as super capacitors, solar cells, gas sensors, photocatalysts, light emitting devices, and so on. [1-5] As a further development it was observed that coupling of two metal oxide semiconductors with different bandgaps improved their physical and chemical properties by affecting their electron-hole pair. These improved physical and chemical properties equipped many of the composite metal oxide semiconductors to act as good gas sensors. For instance, Chesler et al. concluded in their report that ZnO-SnO 2 composite sensor showed an increased sensor response (SR) toward CO than the pristine oxides. [6] In addition, Zhao et al. reported that the ZnO-SnO 2 heterostructures showed enhanced selectivity and response toward NO 2 and ethanol when compared with pure ZnO nanowire. [7] Furthermore, Mondal et al. said that the ZnO-SnO 2 composite thin film sensor showed enhanced sensing property over ZnO sensor. [8] Furthermore, Wang et al. reported that the ZnO/CuO composite-based sensor exhibited a superior response to H 2 S at low operating temperature. [9] It is known that our atmosphere is surrounded by numerous kinds of natural and artificial chemical gases. Some of them are essential and some others are harmful to our life. Ammonia (NH 3) is one among the various harmful gases. NH 3 is a colorless toxic gas with a pungent smelling, and long-term exposure and inhalation to higher concentration lead to serious health problems such as laryngitis, tracheobronchitis, bronchopneumonia, and pulmonary edema. Also, the existence of NH 3 in the exhale breath of people acts as a biomarker for some disease. [10] Early detection of NH 3 is a great concern to counter the accidental threats.

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“…Refractive index is an important property that determines how light propagates through the medium, whereas the extinction coefficient is defined as the imaginary part of the refractive index and is calculated using

n = \frac{1 + R}{1 - R} + \sqrt{\frac{4 R}{{1 - R}^{2}} - k^{2}}

k = α λ true/ 4 π

where R is the reflectance which is calculated using

R = 1 - ((), T + A)

…”

Section: Resultsmentioning

confidence: 99%

Highly transparent flexible polydimethylsiloxane films – a promising candidate for optoelectronic devices

Sundar

Raja

Sanjeeviraja

et al. 2016

Polymer International

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In the present work, a siloxane based flexible substrate for optoelectronic applications with improved flexibility and high temperature withstanding capacity has been fabricated and the details are reported. The structural and optical properties of the substrate were characterized and the optical transparency is found to be about 90% − 95% in the visible region. The substrate withstands temperatures up to 300 °C without significant degradation and has a low thermal coefficient of expansion. Fourier transform infrared spectral data show the materials in the prepared substrate and SEM studies show the surface and cross‐sectional characteristics of the substrate. It has good mechanical strength, can withstand a high breaking load of 7 N, has a average tensile strength of 48.86 MPa and high average tensile modulus of 127.32 and also possesses excellent surface smoothness and resistance to both chemical and moisture with better rigidity; it will be a long lasting alternative for flexible plastic substrates. The optical characteristics such as refractive index (n) and extinction coefficient (k) are also reported. © 2016 Society of Chemical Industry

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Effect of V2O5 concentration on structural and optical properties of WO3 thin films prepared by RF magnetron sputtering

Cited by 10 publications

References 4 publications

The Influence of RF power, pressure and substrate temperature on optical properties of RF Sputtered vanadium pentoxide thin films

The Influence of RF power, pressure and substrate temperature on optical properties of RF Sputtered vanadium pentoxide thin films

Sputtering Power and Annealing Effects on the Properties of Zn₂SnO₄–SnO₂ Composite Thin Film for Pungent Smelling Gas (NH₃) Detection

Highly transparent flexible polydimethylsiloxane films – a promising candidate for optoelectronic devices

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Effect of V2O5 concentration on structural and optical properties of WO3 thin films prepared by RF magnetron sputtering

Cited by 10 publications

References 4 publications

The Influence of RF power, pressure and substrate temperature on optical properties of RF Sputtered vanadium pentoxide thin films

The Influence of RF power, pressure and substrate temperature on optical properties of RF Sputtered vanadium pentoxide thin films

Sputtering Power and Annealing Effects on the Properties of Zn2SnO4–SnO2 Composite Thin Film for Pungent Smelling Gas (NH3) Detection

Highly transparent flexible polydimethylsiloxane films – a promising candidate for optoelectronic devices

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Resources

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Sputtering Power and Annealing Effects on the Properties of Zn₂SnO₄–SnO₂ Composite Thin Film for Pungent Smelling Gas (NH₃) Detection