Photoluminescence of amorphous niobium oxide films synthesized by solid-state reaction

Zhou, Xiaofeng; Li, Zhengcao; Wang, Yuquan; Sheng, Xing; Zhang, Zhengjun

doi:10.1016/j.tsf.2007.12.112

Cited by 15 publications

(12 citation statements)

References 15 publications

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“…This value is high compared to that reported by Mujawar et al, [18]. This may be due to the smaller crystallite size of our films, but this value is in good agreement with Xiaofeng Zhou et al, [11] and very close to band gap of rf sputtered Nb 2 O 5 thin film reported by saturated calomel electrode as reference electrode. Inset of Fig.…”

Section: Surface Morphologysupporting

confidence: 92%

“…The properties of films closely rely on the sputtered material, deposition techniques, deposition parameters and as well as thickness of the films [10]. Nb 2 O 5 thin film are being prepared by several methods like thermal oxidation [11], anodic deposition [12], sputtering [10,13], vacuum evaporation [14], sol-gel [15,16], spray pyrolysis [1,17&18] and spin coating [19]. In the present work, structural, optical and electrochromic properties of the Nb 2 O 5 film deposited using spray pyrolysis are investigated.…”

Section: Introductionmentioning

confidence: 99%

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Spray deposited Nb2O5 thin film electrodes for fabrication of dye sensitized solar cells

Kovendhan

Joseph

Manimuthu

et al. 2011

Trans Indian Inst Met

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Nb 2 O 5 thin film electrodes have been deposited on indium tin oxide substrates by spray pyrolysis technique. XRD analysis reveals tetragonal phase of the film. Reticulated micro-fibrous surface morphology has been observed by scanning electron microscopy and atomic force microscopy indicates closely packed crystallites. Film thickness found using a stylus profilometer is around 26 nm. Transmittance spectra show the film to be 70-80% transparent in the visible region. Direct, indirect band gap and phonon energy are also estimated. Cyclic voltammetry measurement indicate distinct anodic peak during negative potential of the scan due to Li extraction. A reversible colour change from transparent to grey has been observed. The photo-electrochemical characteristic of the dye sensitized solar cell is studied by recording the I-V characteristics of the unsealed type cell under illumination of 40 mW/cm 2 using a solar simulator.

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Section: Surface Morphologysupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Spray deposited Nb2O5 thin film electrodes for fabrication of dye sensitized solar cells

Kovendhan

Joseph

Manimuthu

et al. 2011

Trans Indian Inst Met

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“…Zhou et al showed that emission PL spectrum of Nb 2 O 5 amorphous films deposited on silicon substrate consists of two peaks centered at about 630 nm and 715 nm [40]. Our investigation showed that broad PL bands of Nb 2 O 5 formed by PEO are present in the range from 350 nm to 550 nm.…”

Section: Photocatalytic and Photoluminescent Properties Of Oxide Filmssupporting

confidence: 56%

Anodic luminescence, structural, photoluminescent, and photocatalytic properties of anodic oxide films grown on niobium in phosphoric acid

Stojadinović

Tadić

Radić

et al. 2015

Applied Surface Science

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“…Finally, Figure 6d shows the photoluminescence for the Pechini (HCl) sample at 650 • C. The peak positions are: 440 nm (2.81 eV), 532 nm (2.33 eV) and 624 nm (1.98 eV). According to the work of Xiaofeng et al [22], the niobium oxides of low valence are oxidized with the annealing temperature, so the content of Nb 2 O 5 is increased. In this Figure, the sol-gel method which has the maximum emission is in blue, with the Pechini being the orange, green and blue regions.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of Nano-Particles of Niobium Pentoxide with Orthorhombic Symmetry

Joya

Barba-Ortega

Raba-Páez

et al. 2017

Metals

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Abstract:In this work, a set of nanoparticles of Nb 2 O 5 nanoparticles were grown by both the Pechini and the sol-gel methods. The amorphous materials were calcined at 650 • C or at 750 • C. X-ray diffraction, scanning electron microscopy, luminescence and Raman spectroscopy were used in order to characterize the materials. From the study, it is possible to state that the method of production of nanoparticles, beyond the temperature of synthesis, has a great influence on whether the phase produced is hexagonal or orthorhombic. Additionally, compared to de Sol-gel method, the Pechini method produced samples with smaller particle sizes. The photoluminescence spectra of niobium pentoxide nanostructure materials show that the emission peaks are positioned between 334 to 809 nm and there is a change of intensity which varies depending on the synthesis route used. High pressure Raman spectra at room temperature were obtained from two samples grown by the sol-gel method. Up to 6 GPa, where it is possible to observe the Raman bands, no modification other than the increase of disorder was observed, and this can be associated with a change of phase.

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Photoluminescence of amorphous niobium oxide films synthesized by solid-state reaction

Cited by 15 publications

References 15 publications

Spray deposited Nb2O5 thin film electrodes for fabrication of dye sensitized solar cells

Spray deposited Nb2O5 thin film electrodes for fabrication of dye sensitized solar cells

Anodic luminescence, structural, photoluminescent, and photocatalytic properties of anodic oxide films grown on niobium in phosphoric acid

Synthesis and Characterization of Nano-Particles of Niobium Pentoxide with Orthorhombic Symmetry

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