Ion beam analysis of a structural phase transition in porous TiO2/V2O5 ceramics with rough surfaces

Mitdank, R.; Habel, Daniela; Görke, Oliver; Harth, Manuel; Schubert, H.; Winter, H.

doi:10.1016/j.nimb.2010.11.047

Cited by 5 publications

(2 citation statements)

References 14 publications

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“…There are at least 15 different vanadium oxides reported till now, such as VO, V 2 O 3 , VO 2 , V 2 O 5, V 6 O 13 and so on. Vanadium oxide thin films have been widely studied for optical, electrical, electrochemical, thermo-chromic and thermal switching materials [1][2][3][4][5][6][7][8][9][10][11]. The interest in these materials has increased in the last few years due to their potential scientific and technological applications, for example as a catalyst [12], a window for solar cells [13], electrochromic devices [14], electronic information displays [15] and color memory devices [16,17].…”

Section: Introductionmentioning

confidence: 99%

Structural And Optical Properties Of VOx Thin Films

Schneider

2015

Archives of Metallurgy and Materials

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VO x thin films were deposited on Corning glass, fused silica and Ti foils by means of rf reactive sputtering from a metallic vanadium target. Argon-oxygen gas mixtures of different compositions controlled by the flow rates were used for sputtering. Influence of the oxygen partial pressure in the sputtering chamber on the structural and optical properties of thin films has been investigated.Structural properties of as-sputtered thin films were studied by X-ray diffraction at glancing incidence, GIXD. Optical transmittance and reflectance spectra were recordedwith a Lambda 19 Perkin-Elmer double spectrophotometer. Thickness of the films was determined from the profilometry. It has been confirmed by XRD that the deposited films are composed mainly of V 2 O 5 phase. The estimated optical band gap of 2.5 eV corresponds to V 2 O 5 .Keywords: VO x thin films, reactive sputtering, microstructure, optical properties, energy band gap Cienkie warstwy VO x były nanoszone na szkło Corning metodą rozpylania magnetronowego rf. Jako katody użyto metalicznego wanadu. Były one nanoszone w komorze wypełnionej mieszaniną argonu i tlenu w różnych proporcjach przy ustalonych przepływach. Zbadano wpływ ciśnienia parcjalnego tlenu w komorze na własności strukturalne i optyczne otrzymanych warstw.Własności strukturalne cienkich warstw zostały określone metodą rozpraszania promieniowania rentgenowskiego padają-cego pod małymi kątami (GIXD). Widma optyczne transmitancji i odbicia zostały wykonane przy użyciu spektrometru Lambda 19 Perkin-Elmer. Grubość badanych warstw zmierzono za pomocą profilometru.Pomiary XRD potwierdziły, że otrzymane warstwy składają się głównie z fazy V 2 O 5 . Wyznaczona optycznie przerwa energetyczna wynosząca 2.5 eV odpowiada przerwie energetycznej V 2 O 5 .

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Section: Introductionmentioning

confidence: 99%

Structural And Optical Properties Of VOx Thin Films

Schneider

2015

Archives of Metallurgy and Materials

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“…Particularly for bio-and energy-storage applications, tuning both the surface porosity and aspect ratio of such metal-oxide nanostructures [23][24][25] are very important. Recently, huge efforts have been made by several research groups to develop highly porous V 2 O 5 surfaces using several techniques, viz., electrosynthesis and anodization [26,27], phase transformation [28], thermal oxidation [28], and sol-gel processes [29,30].…”

Section: Introductionmentioning

confidence: 99%

Tuning surface porosity on vanadium surface by low energy He+ ion irradiation

Tripathi

Novakowski

Hassanein

2016

Applied Surface Science

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In the present study, we report on tuning the surface porosity on vanadium surfaces using highflux, low-energy He + ion irradiation as function of sample temperature. Polished, mirror-finished vanadium samples were irradiated with 100 eV He + ions at a constant ion-flux of 7.2  10 20 ions m-2 s-1 for 1 hour duration at constant sample temperatures in the wide range of 823-1173 K. Our results show that the surface porosity of V 2 O 5 (naturally oxidized vanadium porous structure, after taking out from UHV) is strongly correlated to the sample temperature and is highly tunable. In fact, the surface porosity significantly increases with reducing sample temperature and reaches up to ~87%. Optical reflectivity on these highly porous V 2 O 5 surfaces show ~0% optical reflectivity at 670 nm wavelength, which is very similar to that of "black metal". Combined with the naturally high melting point of V 2 O 5 , this very low optical reflectivity suggests potential application in solar power concentration technology. Additionally, this topdown approach guarantees relatively good contact between the different crystallites and avoids electrical conductivity limitations (if required). Since V 2 O 5 is naturally a potential photocatalytic material, the resulting sub-micron-sized cube-shaped porous structures could be used in solar water splitting for hydrogen production in energy applications.

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