Electrosteric colloidal stabilization for obtaining SrTiO3/TiO2 heterojunction: Microstructural evolution in the interface and photonics properties

Amoresi, Rafael Aparecido Ciola; Teodoro, Vinícius; Teixeira, Guilhermina Ferreira; Li, Máximo Siu; Simões, Alexandre Zirpoli; Perazolli, Leinig Antônio; Longo, Elson; Zaghete, Maria Aparecida

doi:10.1016/j.jeurceramsoc.2017.10.056

Cited by 33 publications

(11 citation statements)

References 66 publications

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“…6 and Table 3 for all the samples. The band gap energy of pure NaSbSe 2 (1.21 eV) is higher than literature data (1.1 eV) [29], which is related to intrinsic defects obtained by different synthesis methods and conditions [38]. It can also be seen that the direct band gap of pure Sb 2 Se 3 sample is 1.15 eV in agreement with previous work [10].…”

Section: Uv-vis Diffuse Reflectance Spectroscopysupporting

confidence: 87%

Synthesis, structure and photoelectric properties of selenide composites with in situ constructed Sb2Se3/NaSbSe2 heterojunction

Ren

Zheng

Wei

et al. 2020

Journal of the European Ceramic Society

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Inorganic semiconductor heterojunctions have attracted extensive attention for technological applications owing to interface phenomena. In this work, selenide composites with in situ constructed Sb2Se3/NaSbSe2 heterojunctions with similar band gap width have been synthesized by conventional melt-quenching method. The microstructure and photoelectric properties of the composites were investigated at J o u r n a l P r e -p r o o f 2 different NaSbSe2 contents. The study revealed that NaSbSe2 content has direct influences on the photoelectric performance of the composites by modifying the heterojunction size and the grain boundary resistance, as evidenced by scanning electron microscopy and impedance spectroscopy, respectively. The photocurrent density of Sb2Se3 with 2.5 and 5 mol% NaSbSe2 was approximately 180 times larger than that of the pure Sb2Se3 at a bias voltage of -1.5 V and under an illumination of 7 mW/cm 2 , due to an effective separation of photogenerated carriers through the interface electric field. Additionally, the composites exhibited an excellent stability even in 0.5 M LiClO4 aqueous electrolyte.

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Section: Uv-vis Diffuse Reflectance Spectroscopysupporting

confidence: 87%

Synthesis, structure and photoelectric properties of selenide composites with in situ constructed Sb2Se3/NaSbSe2 heterojunction

Ren

Zheng

Wei

et al. 2020

Journal of the European Ceramic Society

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“…Therefore, the oxygen vacancies are not the only cause of distortion. Other origins could be the confinement of acoustic phonons and the different grain size according to the study carried out by Amoresi et al [62]. Additionally, a relationship between the final thickness of the TiO 2 film and wavenumber of the E g (1) mode is observed.…”

Section: Resultsmentioning

confidence: 87%

“…A notable displacement of the E g(1) peak corresponding to the anatase phase is noticed because typically the E g (1) mode has been observed at 146 cm −1 (see figure 9(c)). This displacement is related to the existence of oxygen vacancies in the amorphous structure [62]. From PL characterization, it can be noted that the nanotubes had the least amount of self-trapped excitons and oxygen vacancies than the other nanostructures.…”

Section: Resultsmentioning

confidence: 97%

Self-organized and self-assembled TiO₂ nanosheets and nanobowls on TiO₂ nanocavities by electrochemical anodization and their properties

et al. 2020

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In this research work, we prepared for the first time TiO 2 nanosheets and nanobowls assembled on an arrangement of TiO 2 nanocavities, and studied their morphological, optical, and structural properties. The assembled nanostructures were synthesized by a fast two-step electrochemical anodization using fluorides and ethylene glycol. By Field Emission Scanning Electron Microscopy, we showed that these nanostructures have a morphology well organized and ordered with a homogeneous distribution. Also, other characteristics such as photoluminescence, reflectance spectra, band gap energy, and Raman spectra were studied and compared with the optical and structural properties of TiO 2 nanotubes. We found that the time of anodization is a key parameter to control the final shape of the individual elements in the nanostructure. Our results show that when nanobowls or nanosheets are self-assembled on nanocavities the morphological, optical, and structural properties change significantly in comparison to TiO 2 nanotubes. Furthermore, the emission was improved considerably and the band gap energy was modified to higher energy values. Likewise, the interference fringes are generated in the reflectance spectra by the length of the nanocavities and by the thickness of the nanobowls and the nanosheets. Finally, a reduction on the displaced the E g(1) Raman mode was observed with decreasing of the length of the nanocavities.

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“…cluster with oxygen vacancies of the mono-ionized type [55], as can be seen with the Kröger-Vink notation through to the Eq. (2):…”

Section: Photoluminescent Spectroscopymentioning

confidence: 99%

Photoluminescence behavior on Sr 2+ modified CaCu 3 Ti 4 O 12 based ceramics

Orrego

Cortés

Amoresi

et al. 2018

Ceramics International

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Sr 2+ modified CaSr x Cu 3-x Ti 4 O 12 ceramic powders with x = ranging from 0.00 to 3.00 were prepared by solidstate reaction. The effects of Sr 2+ CCTO powders were evaluated by X-ray diffraction (XRD) with Rietveld refinement revealing a mixture of multiple phases. The Raman spectroscopy analysis pointed out that Sr 2+ addition produces an emission in the blue region, associated to TiO 6 clusters. Optical properties by means of PL analysis showed emission near to blue region for the samples with x = 0.00, x = 0.15, x = 0.30, corresponding to oxygen vacancies. The emission in the violet region is associated to deep defects while emission in the other samples is linked to shallow defects typical of disordered crystalline structures. Less prominent emission in the green region with the increase of Sr 2+ corresponds to less self-trapped charges, less interaction between electron and hole, and donor-acceptor recombination.

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Electrosteric colloidal stabilization for obtaining SrTiO3/TiO2 heterojunction: Microstructural evolution in the interface and photonics properties

Cited by 33 publications

References 66 publications

Synthesis, structure and photoelectric properties of selenide composites with in situ constructed Sb2Se3/NaSbSe2 heterojunction

Synthesis, structure and photoelectric properties of selenide composites with in situ constructed Sb2Se3/NaSbSe2 heterojunction

Self-organized and self-assembled TiO₂ nanosheets and nanobowls on TiO₂ nanocavities by electrochemical anodization and their properties

Photoluminescence behavior on Sr 2+ modified CaCu 3 Ti 4 O 12 based ceramics

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Electrosteric colloidal stabilization for obtaining SrTiO3/TiO2 heterojunction: Microstructural evolution in the interface and photonics properties

Cited by 33 publications

References 66 publications

Synthesis, structure and photoelectric properties of selenide composites with in situ constructed Sb2Se3/NaSbSe2 heterojunction

Synthesis, structure and photoelectric properties of selenide composites with in situ constructed Sb2Se3/NaSbSe2 heterojunction

Self-organized and self-assembled TiO2 nanosheets and nanobowls on TiO2 nanocavities by electrochemical anodization and their properties

Photoluminescence behavior on Sr 2+ modified CaCu 3 Ti 4 O 12 based ceramics

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Self-organized and self-assembled TiO₂ nanosheets and nanobowls on TiO₂ nanocavities by electrochemical anodization and their properties