Significant Improvement in Electrical Conductivity and Figure of Merit of Nanoarchitectured Porous SrTiO<sub>3</sub> by La Doping Optimization

Ahmed, Al Jumlat; Hossain, Md. Shahriar A.; Islam, Sheik Md Kazi Nazrul; Yun, Frank Fei; Yang, Guangsai; Hossain, Ridwone; Khan, Aslam; Na, Jongbeom; Eguchi, Miharu; Yamauchi, Yusuke; Wang, Xiaotian

doi:10.1021/acsami.0c01869

Cited by 27 publications

(15 citation statements)

References 47 publications

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“…Meanwhile, the electrical conductivity of Sr 0.96 Sc 0.04 TiO 3 increases slightly in comparison with undoped SrTiO 3 , confirming finite substitution of Sc 3+ for Sr 2+ , which introduces extra electrons and increases the electron concentration ( Figure 3 b). La-doping enhances the electrical conductivity of SrTiO 3 significantly, and the conduction behaviors transform from metal to semiconductor before 468 K. The electrical conductivity increases at low temperatures, while decreases at high temperatures with increasing temperature, which are consistent with the results reported in the literatures [ 23 , 37 ]. However, the values of electrical conductivity are lower than the data reported in the literatures, which is probably ascribed from the Sr vacancy since Sc hardly substitutes Sr.…”

Section: Resultssupporting

confidence: 92%

The Electrical and Thermal Transport Properties of La-Doped SrTiO3 with Sc2O3 Composite

et al. 2021

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Donor-doped strontium titanate (SrTiO3) is one of the most promising n-type oxide thermoelectric materials. Routine doping of La at Sr site can change the charge scattering mechanism, and meanwhile can significantly increase the power factor in the temperature range of 423–773 K. In addition, the introduction of Sc partially substitutes Sr, thus further increasing the electron concentration and optimizing the electrical transport properties. Moreover, the excess Sc in the form of Sc2O3 composite suppresses multifrequency phonon transport, leading to low thermal conductivity of κ = 3.78 W·m−1·K−1 at 773 K for sample Sr0.88La0.06Sc0.06TiO3 with the highest doping content. Thus, the thermoelectric performance of SrTiO3 can be significantly enhanced by synergistic optimization of electrical transport and thermal transport properties via cation doping and composite engineering.

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Section: Resultssupporting

confidence: 92%

The Electrical and Thermal Transport Properties of La-Doped SrTiO3 with Sc2O3 Composite

et al. 2021

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“…As shown in Fig. 4a, the binding energy positions of La 3d3/2 and La 3d5/2 correspond to the oxidation states of La 3+ [24]. It can also be observed from Fig.…”

Section: Phase Composition Analysissupporting

confidence: 57%

Thin and temperature-resistant TiO2–Sr1−xLaxTiO3 (x = 0.1–0.3) composite ceramics for microwave absorption in the X-band

Zhou

Wen

Yang

et al. 2021

J Mater Sci: Mater Electron

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Recently, high-temperature stability is a challenge in a number of microwave absorption materials. Hence, researchers are still searching for a novel material system preferably with a high-temperature resistance to be applied in the field of microwave absorption. Here, in the current study, toward this aim, lanthanum (La) doped strontium titanate (SrTiO3) blended with TiO2 were fabricated by hot-press sintering in vacuum. The as-prepared samples are denoted as TiO2-Sr1-xLaxTiO3 with x varying from 0.1 to 0.3 in steps of 0.1. Scanning electron microscope (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscope (XPS), and microwave vector network analyzer were carried on to study their morphology, phase composition, structure, electromagnetic and microwave absorption properties, respectively. It is revealed that the La atom was efficiently doped at the Sr-site in SrTiO3. Benefiting from the tunability of its dielectric and impedance properties, TiO2-Sr1-xLaxTiO3 can be utilized in a highly efficient way to absorb microwave radiations with a decent design. Results illustrated that TiO2-Sr1-xLaxTiO3 (x=0.2) with a thickness of only 0.42 mm exhibits a high microwave absorption efficiency of -40.89 dB and can achieve a 2.82 GHz bandwidth of reflection loss value below -5 dB. Thus, TiO2-Sr1-xLaxTiO3 composites ceramics can be served as an opening opportunity for the application of high-temperature stability and tunable high-performance effectiveness microwave absorption materials in stealth technology and information security.

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“…As a typical n‐type thermoelectric metal oxide with a perovskite structure, SrTiO 3 (STO) materials have received considerable attention for their large carrier effective mass and superior stability at a high temperature. [ 20–22 ] Intrinsic STO crystal is an insulator with a large bandgap of 3.2 eV and usually utilized to detect ultraviolet light. [ 23,24 ] The conductivity of an STO crystal can be greatly improved by doping La 3+ and Nb 4+ ions, or annealing treatment.…”

Section: Introductionmentioning

confidence: 99%

Self‐Powered Light‐Temperature Dual‐Parameter Sensor Using Nb‐Doped SrTiO₃ Materials Via Thermo‐Phototronic Effect

Ouyang

et al. 2021

Adv Funct Materials

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Multifunctional sensors that can simultaneously detect light and thermal stimuli play an essential role in the research of portable devices and complex arrays of electronics. Lots of effort has been made to realize the simultaneous detection of light and temperature in a standalone device. However, since there is a strong interference of electric signals, accurate simultaneous sensing remains a challenge. Here, a self‐powered dual‐parameter sensor based on thermo‐phototronic effect in Nb‐doped SrTiO3 (NSTO) single crystal to achieve decoupled light and temperature sensing is developed. High light‐ and temperature‐sensing sensitivities of 0.201 µA mW cm−2 and 16.77 µA K−1 are realized, respectively. The excellent simultaneous sensing capability may be attributed to effective light‐to‐electrical and thermal‐to‐electrical energy conversion in the NSTO crystal. The excellent simultaneous sensing performance of the dual‐parameter sensors, together with their ease of fabrication, pushes forward the development of highly sensitive multifunctional sensors.

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Significant Improvement in Electrical Conductivity and Figure of Merit of Nanoarchitectured Porous SrTiO₃ by La Doping Optimization

Cited by 27 publications

References 47 publications

The Electrical and Thermal Transport Properties of La-Doped SrTiO3 with Sc2O3 Composite

The Electrical and Thermal Transport Properties of La-Doped SrTiO3 with Sc2O3 Composite

Thin and temperature-resistant TiO2–Sr1−xLaxTiO3 (x = 0.1–0.3) composite ceramics for microwave absorption in the X-band

Self‐Powered Light‐Temperature Dual‐Parameter Sensor Using Nb‐Doped SrTiO₃ Materials Via Thermo‐Phototronic Effect

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Significant Improvement in Electrical Conductivity and Figure of Merit of Nanoarchitectured Porous SrTiO3 by La Doping Optimization

Cited by 27 publications

References 47 publications

The Electrical and Thermal Transport Properties of La-Doped SrTiO3 with Sc2O3 Composite

The Electrical and Thermal Transport Properties of La-Doped SrTiO3 with Sc2O3 Composite

Thin and temperature-resistant TiO2–Sr1−xLaxTiO3 (x = 0.1–0.3) composite ceramics for microwave absorption in the X-band

Self‐Powered Light‐Temperature Dual‐Parameter Sensor Using Nb‐Doped SrTiO3 Materials Via Thermo‐Phototronic Effect

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Product

Resources

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Significant Improvement in Electrical Conductivity and Figure of Merit of Nanoarchitectured Porous SrTiO₃ by La Doping Optimization

Self‐Powered Light‐Temperature Dual‐Parameter Sensor Using Nb‐Doped SrTiO₃ Materials Via Thermo‐Phototronic Effect