Structural and optical properties of nanostructural V2O5 thin films deposited by spray pyrolysis technique: Effect of the substrate temperature

Irani, Rowshanak; Rozati, Seyed Mohammad; Beke, Szabolcs

doi:10.1016/j.matchemphys.2013.01.046

Cited by 54 publications

(27 citation statements)

References 26 publications

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“…Heat treated films display very different optical properties with increased transmittance, except at room temperature and λ > 1600 nm, and no trace of thermochromism. These data are consistent with those expected for V 2 O 5 [25][26][27][28][29][30][31], and it is obvious that the vanadium-based film is fully oxidized. Data were recorded also for τ h = 80 °C and RH = 80%, but otherwise as before.…”

Section: Equipment and Procedures For Ageing Testssupporting

confidence: 90%

Durability of thermochromic VO2 thin films under heating and humidity: Effect of Al oxide top coatings

Niklasson

et al. 2014

Thin Solid Films

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An explorative study was performed on sputter-deposited thermochromic (TC) VO 2 films exposed to heat treatment under dry and humid conditions. The ambient conditions were harsh and 80-nm-thick VO 2 films rapidly converted to non-TC V 2 O 5 . It was found that a 30-nm-thick sputter-deposited Al oxide top coating provided good protection and delayed the oxidation for more than one day upon heating in dry air at 300 °C and that protection occurred for several days at 95 % relative humidity and 60 °C. The thickness of the Al oxide was important and, expectedly, increased thickness yielded enhanced protection. Our results are important for TC fenestration as well as for other technical applications.

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Section: Equipment and Procedures For Ageing Testssupporting

confidence: 90%

Durability of thermochromic VO2 thin films under heating and humidity: Effect of Al oxide top coatings

Niklasson

et al. 2014

Thin Solid Films

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“…(212) planes. 25 The preferred orientation of the V 2 O 5 NRs was found to be along c-axis (001) plane at 2 ¼ 20:2 . It is assumed that the orthorhombic V 2 O 5 phase being in accordance with other V 2 O 5 thin¯lms deposited by the same and other methods.…”

Section: Methodsmentioning

confidence: 91%

INFLUENCE OF ANNEALING DURATION ON THE GROWTH OF V₂O₅ NANORODS SYNTHESIZED BY SPRAY PYROLYSIS TECHNIQUE

et al. 2016

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This paper deals with the investigation of annealing e®ects on the structural, morphological and optical properties of V 2 O 5 nanorods (NRs) grown on the glass substrates by using chemical spray pyrolysis technique. The as-prepared samples were annealed at 500 for 40, 60 and 120 min in a quartz tube furnace. The high resolution X-ray di®raction (XRD) analysis revealed V 2 O 5 NRs with preferred orientation along (001) plane. The crystallite size of the V 2 O 5 NRs was increased by increasing the annealing duration. The morphological observations using¯eld emission scanning electron microscope (FESEM) displayed NRs structures whose diameter and length were found to increase with increase of the annealing duration. The transmission electron microscopy (TEM) analysis con¯rmed the orthorhombic structures of the NRs. The AFM measurements indicated an increase of the average surface roughness by increasing the annealing time. The Raman spectroscopy revealed V-O-V phonon mode in the NRs annealed for 120 min. The optical bandgap was found in the range 2.6-2.58 eV and observed to decrease with various duration annealed.

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“…The X-ray diffraction (XRD) patterns of V 2 O 5 thin films at different substrate temperatures are shown in 13,14 The crystallite size of the films was estimated with the Debye-Scherrer formula for the (001) reflection:…”

Section: Structural Propertiesmentioning

confidence: 99%

“…17 The plotting of (ahv) 1/m versus the photon energy (hv) and extrapolating it to (ahv) 1/m = 0 gives the value of E g . Figure 4 shows the plots of (ahv) 2 14 . The decrease in the optical band gap is attributed to the microstructural changes caused by a high substrate temperature.…”

Section: Optical Propertiesmentioning

confidence: 99%

Influence of the substrate temperature on the structural, optical and thermoelectric properties of sprayed V2O5 thin films

Vijayakumar¹,

Reddy²,

Moholkar³

2015

Mater. Tehnol.

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Vanadium pentoxide (V2O5) thin films were deposited using the spray pyrolysis technique. An aqueous solution of ammonium vanadate with a 0.05 M concentration was used for depositing V2O5 thin films at three different substrate temperatures on glass substrates. The structural and optical characteristics of the V2O5 thin films were examined with X-ray diffraction (XRD) and double-beam UV-visible spectrophotometry. The X-ray diffraction study of the V2O5 thin films revealed a polycrystalline nature of the orthorhombic structure with the preferred orientation of (001). The crystallite size (d) was calculated from the (001) diffraction peak using the Debye-Scherrer formula. From the optical absorbance measurements, the optical band gap (Eg) was determined. A scanning electron microscope (SEM) was used to characterize the morphology of the films. Electrical measurements of the films indicated that the resistance decreases with an increase in the substrate temperature. From the thermoelectric measurements, the Seebeck coefficient was determined. Keywords: V 2 O 5 thin film, spray pyrolysis, optical band gap, activation energy, temperature coefficient of resistance, Seebeck coefficient Tanka plast vanadijevega pentoksida (V2O5) je bila nanesena s tehniko piroliznega brizganja. Za nanos tanke plasti V2O5 na podlago iz stekla pri treh razli~nih temperaturah podlage je bila uporabljena koncentracija vodne raztopine amonijevega vanadata 0,05 M. Zna~ilnosti strukture in opti~ne zna~ilnosti tanke plastiV2O5 so bile preiskovane z rentgensko difrakcijo in z dvo`arkovno UV-vidno spektrofotometrijo. Rentgenska difrakcija tanke plasti V2O5 je odkrila polikristalno naravo ortorombi~ne strukture s prednostno orientacijo (001). Velikost kristalitov (d) je bila izra~unana iz difrakcijskega vrha (001) z Debye-Scherrerjevo formulo. Iz meritev opti~ne absorbance je bila dolo~ena pasovna vrzel (Eg). Za karakterizacijo morfologije plasti je bil uporabljen vrsti~ni elektronski mikroskop (SEM). Elektri~ne meritve tankih plasti so pokazale, da se upornost zmanj{uje z nara{~anjem temperature podlage. Iz termoelektri~nih meritev je bil dolo~en Seebeckov koeficient. Klju~ne besede: tanka plast V2O5, pirolizno brizganje, opti~na pasovna vrzel, aktivacijska energija, temperaturni koeficient upornosti, Seebeckov koeficient

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Structural and optical properties of nanostructural V2O5 thin films deposited by spray pyrolysis technique: Effect of the substrate temperature

Cited by 54 publications

References 26 publications

Durability of thermochromic VO2 thin films under heating and humidity: Effect of Al oxide top coatings

Durability of thermochromic VO2 thin films under heating and humidity: Effect of Al oxide top coatings

INFLUENCE OF ANNEALING DURATION ON THE GROWTH OF V₂O₅ NANORODS SYNTHESIZED BY SPRAY PYROLYSIS TECHNIQUE

Influence of the substrate temperature on the structural, optical and thermoelectric properties of sprayed V2O5 thin films

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Structural and optical properties of nanostructural V2O5 thin films deposited by spray pyrolysis technique: Effect of the substrate temperature

Cited by 54 publications

References 26 publications

Durability of thermochromic VO2 thin films under heating and humidity: Effect of Al oxide top coatings

Durability of thermochromic VO2 thin films under heating and humidity: Effect of Al oxide top coatings

INFLUENCE OF ANNEALING DURATION ON THE GROWTH OF V2O5 NANORODS SYNTHESIZED BY SPRAY PYROLYSIS TECHNIQUE

Influence of the substrate temperature on the structural, optical and thermoelectric properties of sprayed V2O5 thin films

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INFLUENCE OF ANNEALING DURATION ON THE GROWTH OF V₂O₅ NANORODS SYNTHESIZED BY SPRAY PYROLYSIS TECHNIQUE