Structural and mechanical properties of nanostructured tungsten oxide thin films

Hasan, M. M.; Haseeb, A.S.M.A.; Masjuki, H.H.

doi:10.1179/1743294412y.0000000066

Cited by 24 publications

(18 citation statements)

References 36 publications

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“…We found the obtainment of high mechanical strength material, in which the H and E values increase more than three times when heating at 800°C (Dc of about 40 nm). The present trend for the effect of heating temperature on the mechanical properties is in good agreement with previous studies (Hasan et al, 2012). Based on the above analysis, it is found that Dc has a more significant impact on the change of micromechanical structure.…”

Section: Resultssupporting

confidence: 92%

“…Thus, this information will be important to comprehend the best process condition when employing WO 3 materials. Until now, several papers have reported the mechanical properties of WO 3 (Abadias et al, 2006;Hasan et al, 2012;Maillé et al, 2005;Parreira et al, 2006). Most of the reports focused on the thin film, while reports on the WO 3 particles are disregarded.…”

Section: Introductionmentioning

confidence: 99%

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Crystallite Size on Micromechanical Characteristics of WO3 Microparticles

Nandiyanto

Triawan²,

Firly³

et al. 2021

JER is an international, peer-reviewed journal that publishes f

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This study evaluated the relationship between crystallite size and micromechanical characteristics of micrometersized monoclinic WO3 particles. To avoid the existence of other parameters in the measurement (such as impurities and porous structure in the particle), micrometer WO3 particles were prepared using a direct heat treatment of ultrapure micrometer-sized ammonium tungstate powders. The crystallite size was controlled independently in constant WO3 particle outer diameters to obtain a precise measurement result. The mechanical properties, i.e., hardness and Young’s modulus, were measured by load-controlled nanoindentation test on the singular WO3 particles. The force and displacement relationship data was plotted and analyzed to obtain the relationship between crystallite size and mechanical properties. The results revealed that the micromechanical properties of WO3 particles were strongly dependent on the crystallite size. The hardness and Young’s modulus values increased more than three times when increasing the crystallite size to about 40 nm. The study was completed with a proposed mechanism of crack propagation inside the particle due to static load. The study demonstrates the important role of crystallite size in determining the micromechanical characteristics of WO3 particles. The result is useful especially when utilizing WO3 microparticles for various processes involving extreme conditions, such as high pressure reaction.

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Section: Resultssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Crystallite Size on Micromechanical Characteristics of WO3 Microparticles

Nandiyanto

Triawan²,

Firly³

et al. 2021

JER is an international, peer-reviewed journal that publishes f

View full text Add to dashboard Cite

show abstract

“…The peaks were found to be shifted to lower q values and the intensity of the peaks was increased with the lithium content in the films. This may be due to a change in the symmetry of the hexagonal WO 3 to a higher order, possibly orthorhombic [19], and [20]. The lattice parameters are calculated from the above data and the value of "a" is relatively constant at 0.735 nm and "c" decreases from 0.382 nm to 0.375 nm, which represents a contraction of the lattice volume, because the Li + ions at interstitial positions attract the neighbouring O 2-ions in the lattice with increasing quantity of lithium in WO 3 films and which is consistent with the reported data [19], [20].…”

Section: Resultsmentioning

confidence: 99%

Effect of substrate on the electro chromic properties of tungsten trioxide thin films

Prabhakar

Ashrit²

2014

IJET

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Thin films of tungsten trioxide (WO3) were deposited onto glass and Indium Tin Oxide (ITO) coated glass substrates using thermal evaporation technique under various deposition conditions. In the present work the effect of substrate on the structure and EC performance of WO3 thin films has been examined using a dry lithiation method. The structural and optical changes occurring in these films with lithium insertion have been studied. It is found that the ITO coated substrate promotes the granulation and higher coloration efficiencies of the films. The peak efficiency is observed at higher infrared wavelengths where it is principally the reflectance modulation that brings about optical changes.

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“…[1]. On the other hand, tungsten oxide has been used as an outstanding electrochromic material for smart-window applications, anti-glare rear view mirrors for automobiles and gas sensors owing to its excellent optical and electrochromic properties [2]. Now-a-days, research efforts have been focused to find a new optical and EC material with improved optical and electro-optical characteristics, which find applications in integrated optics such as optical modulation, optical information display, and optical data storage [3].…”

Section: Introductionmentioning

confidence: 99%

Effect of substrate temperature on structural and optical properties of nickel tungsten oxide thin films

Usha

Sivakumar

Sanjeeviraja

2014

J Mater Sci: Mater Electron

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In this work, we present the substrate temperature induced change in the structural, optical, vibrational and luminescence properties of mixed NiO:WO 3 (95:5) thin films deposited on glass substrates by rf magnetron sputtering technique. X-ray diffraction analysis revealed the onset of crystallization of the films occurred at 300°C. The average optical transmittance of the films varied between 91 and 97 % in the visible region. The refractive index and extinction coefficient of films are found to decrease with increasing substrate temperature. It was observed that the dispersion data obeyed the single oscillator of the Wemple-DiDomenico model, from which the dielectric constants, ratio between free carrier density and free carrier effective mass, plasma frequency, oscillator energy, oscillator strength, and dispersion energy parameters of NiO:WO 3 films were calculated and reported for the first time due to variation in substrate temperature during deposition by rf magnetron sputtering. The micro-Raman result shows two broad peaks corresponding to one-phonon LO mode at 570 cm -1 and two-phonon LO mode at 1,100 cm -1 due to the vibrations of Ni-O bonds and the peak found at 870 cm -1 belongs to the W-O mode. Room temperature photoluminescence (RTPL) study exhibits two characteristic emission peaks at 3.32 eV (374 nm) and 2.93 eV (423 nm), which corresponding to the transition of 3d 8 Ni 2? ions. We have made an attempt to discuss and correlate these results with the light of possible mechanisms underlying the phenomena.

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Structural and mechanical properties of nanostructured tungsten oxide thin films

Cited by 24 publications

References 36 publications

Crystallite Size on Micromechanical Characteristics of WO3 Microparticles

Crystallite Size on Micromechanical Characteristics of WO3 Microparticles

Effect of substrate on the electro chromic properties of tungsten trioxide thin films

Effect of substrate temperature on structural and optical properties of nickel tungsten oxide thin films

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