Investigation on versatile behaviour of Cd doped SrTiO3 perovskite structured compounds

Padmini, E.; Ramachandran, K.

doi:10.1016/j.ssc.2019.113716

Cited by 32 publications

(5 citation statements)

References 66 publications

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“…In addition to this main emission, several other peaks appeared in the spectra of all samples, such as a broad emission band at 430 nm and four sharp emission bands at 454, 472, 485, and 495 nm. The relatively broad violet and sharp blue emissions, respectively, may arise from the presence of shallow defects and radioactive defects associated with the interface traps. − Therefore, by these PL emissions, it is possible to infer that both doped and undoped SrTiO 3 samples possess a local disorder in their electronic structure. The PL spectrum of Mo:STO presents a slight intense signal concerning the pristine STO, associated with a slight enhancement of the Ti 3+ defect after the doping process.…”

Section: Resultsmentioning

confidence: 99%

Constructing Particulate p–n Heterojunction Mo:SrTiO₃/NiO@Ni(OH)₂ for Enhanced H₂ Evolution under Simulated Solar Light

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Rabelo

Rodríguez‐Gutiérrez

et al. 2022

ACS Appl. Energy Mater.

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The global environmental issues associated with the use of fossil fuels lead to an urgent need for renewable energy sources, especially those free of CO2 emissions, such as green hydrogen. In this work, we successfully synthesized Mo-doped SrTiO3 by a molten salt method for photocatalytic hydrogen production under simulated solar light (AM 1.5G illumination). As a strategy to enhance the photocatalytic performance of Mo:SrTiO3, nickel-based nanoparticles (NiO@Ni(OH)2) were deposited onto the surface of the particles by modified magnetron sputtering to form a p–n heterojunction (HJ), resulting in the photocatalytic improvement of around 30-fold concerning pristine SrTiO3. Theoretical investigation of the electronic band structure, by DFT, reveals that the addition of Mo as a dopant leads to the formation of midgap states near the conduction band, further attributed to the photoactivity of Mo:SrTiO3 under visible-light illumination (>400 nm). The obtained structure, Mo:SrTiO3/NiO@Ni(OH)2, had its electronic behavior studied by XPS, Mott–Schottky analysis, and UV–vis spectroscopy, leading to the construction of a band diagram that confirms type-II p–n HJ formation. Remarkably, the formation of the HJ was responsible for establishing an internal electric field, which drives the photogenerated holes to the NiO@Ni(OH)2 structure, leading to the suppression of electron–hole recombination, observed by the reduction of the PL signal.

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Section: Resultsmentioning

confidence: 99%

Constructing Particulate p–n Heterojunction Mo:SrTiO₃/NiO@Ni(OH)₂ for Enhanced H₂ Evolution under Simulated Solar Light

Centurion

Rabelo

Rodríguez‐Gutiérrez

et al. 2022

ACS Appl. Energy Mater.

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“…Infrared bands on STO films with the addition of Cu dopants were sharper, possibly due to Cu-O vibrations. Changes in the infrared bands and transmittance at Cu-O and Sr-O represent a disruption of the Sr-Ti-O network due to the substitution of Cu 2+ ions to Sr 2+ sites in SrTiO3 [16,17]. There are small infrared bands between 1500 and 1700 cm -1 , as well as between 3650 and 3845 cm -1 .…”

Section: Resultsmentioning

confidence: 99%

Effect of Cupric-Doped SrTiO₃ Films on Optical Properties Using Spectrophotometry Method

Santi,

Har,

Jenie

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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Film Strontium Titanate (SrTiO3) doping cupric (Cu2+) with various concentrations (0%, 0.5%, and 1%) was successfully synthesized using the Chemical Solution Deposition (CSD) method. The films were deposited above the Si type-p (1 0 0) substrate in five layers using a spin-coating technique (3000 rpm, for 60 s) at a concentration of 2 M. The annealing process was held at 850 °C for 8 hours with a temperature increase rate of 1.67 °C/min for crystallization, and the optical properties were characterized using spectrophotometric methods. The results of FTIR with the Kramers-Kroning quantitative method showed a decrease in the wavenumber of the phonon vibration mode Transverse Optic (TO), Longitudinal Optic (LO), and the intersection of the real and imaginary dielectrics, which showed a red shift with increasing Cu concentration. The optical properties of SrTiO3 films doped with Cu indicate their potential for applications in visible light photoconduction, such as light sensors.

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“…The spectra are in the absorption band of 400-4000 cm -1 . According to the reference, the absorption peak at 558.42 cm -1 is the Sr-Ti-O strain [21] which indicates the formation of SrTi0.80Mn0.20O3. The absorption peaks at 867.4 cm -1 and 3453.69 cm -1 are OH strains, which are ascribed to the H2O molecules present in the sample [12].…”

Section: Resultsmentioning

confidence: 99%

Sintering Temperature Effects on Photocatalytic Activity of SrTi0.80Mn0.20O3

Afriani

Sandi

Nurosyid

et al. 2022

MSF

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SStrontium titanate (STO) is well recognized as promising perovskite photocatalytic material. The catalytic characteristics of STO can be improved by modification with Mn metal. In this study, SrTi0.80Mn0.20O3 has been successfully fabricated using coprecipitation technique with varied sintering temperatures of 700°C, 800°C, 900°C, and 1000°C. This study aimed to investigate the effect of sintering temperature on the photocatalytic activity of SrTi0.80Mn0.20O3. The photocatalyst activity of SrTi0.80Mn0.20O3 could be observed by the degradation of Methylene blue (MB) dye. Based on the X-Ray Diffraction (XRD) and Fourier Transform Infra-Red (FTIR) data, the SrTi0.80Mn0.20O3 has been made. The data also showed that the impurities phases have been reduced and eliminated by the higher sintering temperatures. Nevertheless, all varied samples of the SrTi0.80Mn0.20O3 have successfully exhibited their photocatalyst activity by degrading the MB dye under UV light irradiation with irradiation times of 0, 1, 2, 3, 4, 5, and 6 hours. According to the UV-Vis absorption data, the irradiation time could considerably decline the absorption peaks of MB dye in SrTi0.80Mn0.20O3. Besides, the higher sintering temperature did not influence the absorption peaks position but slightly changed their intensity (at the same irradiation time). Furthermore, the higher sintering temperature and longer irradiation time tended to produce higher DR% of up to 66.63%.

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Investigation on versatile behaviour of Cd doped SrTiO3 perovskite structured compounds

Cited by 32 publications

References 66 publications

Constructing Particulate p–n Heterojunction Mo:SrTiO₃/NiO@Ni(OH)₂ for Enhanced H₂ Evolution under Simulated Solar Light

Constructing Particulate p–n Heterojunction Mo:SrTiO₃/NiO@Ni(OH)₂ for Enhanced H₂ Evolution under Simulated Solar Light

Effect of Cupric-Doped SrTiO₃ Films on Optical Properties Using Spectrophotometry Method

Sintering Temperature Effects on Photocatalytic Activity of SrTi<sub>0.80</sub>Mn<sub>0.20</sub>O<sub>3</sub>

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Investigation on versatile behaviour of Cd doped SrTiO3 perovskite structured compounds

Cited by 32 publications

References 66 publications

Constructing Particulate p–n Heterojunction Mo:SrTiO3/NiO@Ni(OH)2 for Enhanced H2 Evolution under Simulated Solar Light

Constructing Particulate p–n Heterojunction Mo:SrTiO3/NiO@Ni(OH)2 for Enhanced H2 Evolution under Simulated Solar Light

Effect of Cupric-Doped SrTiO3 Films on Optical Properties Using Spectrophotometry Method

Sintering Temperature Effects on Photocatalytic Activity of SrTi<sub>0.80</sub>Mn<sub>0.20</sub>O<sub>3</sub>

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Constructing Particulate p–n Heterojunction Mo:SrTiO₃/NiO@Ni(OH)₂ for Enhanced H₂ Evolution under Simulated Solar Light

Constructing Particulate p–n Heterojunction Mo:SrTiO₃/NiO@Ni(OH)₂ for Enhanced H₂ Evolution under Simulated Solar Light

Effect of Cupric-Doped SrTiO₃ Films on Optical Properties Using Spectrophotometry Method