Pulsed laser deposition and characterisation of perovskite-type LaTiO3−xNx thin films

Marozau, Ivan; Shkabko, Andrey; Döbeli, M.; Lippert, Thomas; Mallepell, M.; Schneider, Claudia; Weidenkaff, Anke; Wokaun, Alexander

doi:10.1016/j.actamat.2011.08.019

Cited by 28 publications

(37 citation statements)

References 34 publications

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“…The crystallite size increases after annealing and decreases on further annealing at higher temperature (600 and 800°C). This trend has also been reported previously in literature [22].…”

Section: Structural Propertiessupporting

confidence: 82%

“…It appears that 500°C is the optimum post-annealing temperature for the growth of Ba 3 Zr 2 O 7 thin films. One of the reasons of oxygen deficiency in the films is larger scattering and low sticking coefficient of oxygen atoms with the silicon substrate [22]. The strongest intensity of (0 0 8) peak is obtained for the sample annealed at 500°C, confirming that the BZO-an-500 has the best crystallinity and largest grain size among the other samples.…”

Section: Structural Propertiessupporting

confidence: 54%

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Epitaxial thin-film growth of Ruddlesden–Popper-type Ba3Zr2O7 from a BaZrO3 target by pulsed laser deposition

et al. 2016

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Ruddlesden-Popper Ba 3 Zr 2 O 7 thin films have been synthesized via pulsed laser deposition (PLD) technique. The optimization of deposition parameters in PLD enables the formation of thin film of metastable Ba 3 Zr 2 O 7 phase from BaZrO 3 target. In order to see the post-annealing effects on the structural and optical properties, the deposited Ba 3 Zr 2 O 7 thin films were annealed at 500, 600 and 800°C. X-ray diffraction (XRD) reveals the formation of Ba 3 Zr 2 O 7 phase with tetragonal structure. The changes in the surface of the deposited films were analysed by FE-SEM and AFM. The thin film post-annealed at 500°C exhibited the best structural, optical and surface properties. Furthermore, the chemical states and chemical composition of the films were determined by X-ray photoelectron spectroscopy (XPS) near the surface. The XPS results show that Ba, Zr and O exist mainly in the form of Ba 3 Zr 2 O 7 Ruddlesden-Popper-type perovskite structure.

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“…The crystallite size increases after annealing and decreases on further annealing at higher temperature (600 and 800°C). This trend has also been reported previously in literature [22].…”

Section: Structural Propertiessupporting

confidence: 82%

Section: Structural Propertiessupporting

confidence: 54%

Epitaxial thin-film growth of Ruddlesden–Popper-type Ba3Zr2O7 from a BaZrO3 target by pulsed laser deposition

et al. 2016

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“…1A (pattern in red color) are assigned to pure LTO. The expansion of the crystal lattice resulted from the doping was clearly observed with the shift of the diffraction peaks toward the lower angle range, since the ion radius of N 2− (1.29 Å) is larger than that of O 2− (1.21 Å) [25,26]. For stacked g-C 3 N 4 nanosheets obtained by the thermal oxidation process, the reflection peak at 12.6 • in Fig.…”

Section: Characterization Of G-c 3 N 4 /Nltomentioning

confidence: 88%

Graphitic-C3N4 hybridized N-doped La2Ti2O7 two-dimensional layered composites as efficient visible-light-driven photocatalyst

Cai

Zhang

Fujitsuka

et al. 2017

Applied Catalysis B: Environmental

111

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a b s t r a c tPerovskite-type La 2 Ti 2 O 7 (LTO), having a layered structure and the separated H 2 and O 2 evolution sites, is attractive as an efficient photocatalyst. However, the photocatalytic activity is often limited by the poor electron mobility. This problem can be conquered by hybridization with materials having efficient properties for the visible light absorption and charge carrier transport. Here, we report a two-dimensional (2D) layered composite hybridized by approximately 2 nm thick graphitic C 3 N 4 nanosheets (g-C 3 N 4 ) and 7 nm thick nitrogen doped LTO nanosheets (NLTO) (g-C 3 N 4 /NLTO), in which g-C 3 N 4 and NLTO act as hole receptor and electron conductor, respectively. g-C 3 N 4 /NLTO exhibited high photocatalytic activities for H 2 production via water splitting and dye degradation under the UV and visible light irradiation, due to the interfacial charge transfer between g-C 3 N 4 and NLTO. The electrochemical measurement showed the type II band alignment with favorable charge transfer from g-C 3 N 4 to NLTO. The 2D architecture with a maximized interfacial area allows efficient charge separation with a short interfacial distance. This efficient interfacial charge transfer is further elucidated from monitoring of charge separation and trapping processes using the femtosecond time-resolved diffused reflectance (TDR) measurement.

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“…[22][23][24] This technique allows the nitrogen incorporation into the monoclinic oxide (La 2 Ti 2 O 7 )bya pplying reactive and nitrogen-containing gas jets into the vacuum chamber (e.g.,N H 3 or N 2 ), which cross the ablation plume close to the oxide target. [22][23][24] This technique allows the nitrogen incorporation into the monoclinic oxide (La 2 Ti 2 O 7 )bya pplying reactive and nitrogen-containing gas jets into the vacuum chamber (e.g.,N H 3 or N 2 ), which cross the ablation plume close to the oxide target.…”

Section: Methodsmentioning

confidence: 99%

Determination of Conduction and Valence Band Electronic Structure of LaTiO_xN_yThin Film

et al. 2017

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The nitrogen substitution into the oxygen sites of several oxide materials leads to a reduction of the band gap to the visible-light energy range, which makes these oxynitride semiconductors potential photocatalysts for efficient solar water splitting. Oxynitrides typically show a different crystal structure compared to the pristine oxide material. As the band gap is correlated to both the chemical composition and the crystal structure, it is not trivial to distinguish which modifications of the electronic structure induced by the nitrogen substitution are related to compositional and/or structural effects. Here, X-ray emission and absorption spectroscopy are used to investigate the electronic structures of orthorhombic perovskite LaTiO N thin films in comparison with films of the pristine oxide LaTiO with similar orthorhombic structure and cationic oxidation state. Experiment and theory show the expected upward shift in energy of the valence band maximum that reduces the band gap as a consequence of the nitrogen incorporation. This study also shows that the conduction band minimum, typically considered almost unaffected by nitrogen substitution, undergoes a significant downward shift in energy. For a rational design of oxynitride photocatalysts, the observed changes of both the unoccupied and occupied electronic states have to be taken into account to justify the total band-gap narrowing induced by the nitrogen incorporation.

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Pulsed laser deposition and characterisation of perovskite-type LaTiO3−xNx thin films

Cited by 28 publications

References 34 publications

Epitaxial thin-film growth of Ruddlesden–Popper-type Ba3Zr2O7 from a BaZrO3 target by pulsed laser deposition

Epitaxial thin-film growth of Ruddlesden–Popper-type Ba3Zr2O7 from a BaZrO3 target by pulsed laser deposition

Graphitic-C3N4 hybridized N-doped La2Ti2O7 two-dimensional layered composites as efficient visible-light-driven photocatalyst

Determination of Conduction and Valence Band Electronic Structure of LaTiO_xN_yThin Film

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Pulsed laser deposition and characterisation of perovskite-type LaTiO3−xNx thin films

Cited by 28 publications

References 34 publications

Epitaxial thin-film growth of Ruddlesden–Popper-type Ba3Zr2O7 from a BaZrO3 target by pulsed laser deposition

Epitaxial thin-film growth of Ruddlesden–Popper-type Ba3Zr2O7 from a BaZrO3 target by pulsed laser deposition

Graphitic-C3N4 hybridized N-doped La2Ti2O7 two-dimensional layered composites as efficient visible-light-driven photocatalyst

Determination of Conduction and Valence Band Electronic Structure of LaTiOxNyThin Film

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Determination of Conduction and Valence Band Electronic Structure of LaTiO_xN_yThin Film