Fast and accurate full-spectrum interrogation for fiber Fabry–Perot interferometric sensor consisting of Bragg gratings in polarization maintaining fiber

Two-dimensional bismuth telluride (Bi 2 Te 3 ) nanoplates have great potential for thermoelectrics and topological insulators. The material performance increases as the nanoplate size decreases. However, the initial stage of the crystal growth of the nanoplates has not been significantly investigated. The Bi 2 Te 3 nanoplates are prepared by solvothermal synthesis and the phase transition based on the screw dislocation-driven spiral growth of the nanoplates is investigated. The optimal synthesis conditions are first determined by controlling the Te concentration in the precursor solution. The spiral-grown nanoplates are collected from the synthesized products. The diameter of the critical nucleus is calculated to be in the range of 5.0-7.2 nm from the step width in the spiral. Subsequently, the solvothermal synthesis is implemented by changing the synthesis time from 15 to 1200 min under the optimal conditions of the precursor solution. Crystals are not grown in the solution at 15 min. At 25 min, an intermediate phase of Bi 2 TeO 5 with an approximate grain size of 5.0 nm is formed, which corresponds to the calculated diameter of the critical nucleus. Another intermediate phase of Te is formed, and the Bi 2 Te 3 nanoplates with a lateral size of 300 nm grow slowly at the expense of Bi 2 TeO 5 and Te.

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Investigation of Phase Transition from Critical Nucleus to Bi₂Te₃ Nanoplate Based on Screw Dislocation‐Driven Spiral Growth by Solvothermal Synthesis

Yamazaki

Eguchi

Takashiri

2021

Crystal Research and Technology

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Optical and electronic transport properties of single-crystalline Bi<sub>2</sub>Te<sub>3</sub> hexagonal nanoplates determined by infrared spectroscopy and first-principles calculations

Wada

Morikawa

Takashiri

2018

Trans. Mat. Res. Soc. Japan

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The optical and electronic transport properties of bismuth telluride (Bi2Te3) nanoplates were determined using infrared spectroscopy measurements combined with first-principles calculations. The Bi2Te3 nanoplates were prepared by solvothermal synthesis and consisted of single-crystalline particles of hexagonal shape, with edge lengths of approximately 1.2 µm and a thickness of less than 30 nm. To determine the optical and electronic transport properties, the nanoplates were aligned on a glass substrate by using a drop-casting method. We prepared two types of nanoplates: a non-annealed sample with high resistance (due to the presence of isolated nanoplates) and an annealed sample with relatively low resistance, due to its connected nanoplates. The bandgap of the nanoplates, evaluated using infrared spectroscopy, was not significantly affected by the connecting process. The direct and indirect bandgaps were estimated to be approximately 0.14 and 0.06 eV, respectively, and were different from the values previously reported for single-crystalline bulk materials. Although the exact reason for this difference is not clear, we suggest that the structure of the nanoplates might influence the electronic band structure. The electronic transport properties were estimated by infrared spectroscopy using the Drude model, with the effective mass determined from the band structure obtained from first-principles calculations based on density functional theory. The electronic transport properties of the non-annealed nanoplates were essentially the same as those of their annealed counterparts. Therefore, we conclude that the electronic transport properties of nanoplates can be estimated through a combined analysis of different samples, in which the nanoplates are tightly connected or isolated from each other.

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Measurement of thermal boundary resistance and thermal conductivity of single-crystalline Bi₂Te₃ nanoplate films by differential 3ω method

Mori

Norimasa

Kurokawa

et al. 2020

Appl. Phys. Express

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We measured the thermal boundary resistance (TBR) and thermal conductivity of single-crystalline Bi2Te3 nanoplate films. The nanoplates were synthesized using the solvothermal method, and nanoplate films were formed using drop-casting followed by thermal annealing. The thermal resistance of nanoplate films of different thicknesses was measured by the application of a differential 3ω method. From the measured thermal resistance, the TBR was estimated to be 2.7 × 10−6 m2 K W−1. To negate the effect of TBR on the measured thermal resistance of the nanoplate films, we separately determined the thermal conductivity of the nanoplate film to be 1.57 ± 0.11 W m−1 K−1.

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Fast and accurate full-spectrum interrogation for fiber Fabry–Perot interferometric sensor consisting of Bragg gratings in polarization maintaining fiber

Cited by 4 publications

References 44 publications

Investigation of Phase Transition from Critical Nucleus to Bi₂Te₃ Nanoplate Based on Screw Dislocation‐Driven Spiral Growth by Solvothermal Synthesis

Investigation of Phase Transition from Critical Nucleus to Bi₂Te₃ Nanoplate Based on Screw Dislocation‐Driven Spiral Growth by Solvothermal Synthesis

Optical and electronic transport properties of single-crystalline Bi<sub>2</sub>Te<sub>3</sub> hexagonal nanoplates determined by infrared spectroscopy and first-principles calculations

Measurement of thermal boundary resistance and thermal conductivity of single-crystalline Bi₂Te₃ nanoplate films by differential 3ω method

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Fast and accurate full-spectrum interrogation for fiber Fabry–Perot interferometric sensor consisting of Bragg gratings in polarization maintaining fiber

Cited by 4 publications

References 44 publications

Investigation of Phase Transition from Critical Nucleus to Bi2Te3 Nanoplate Based on Screw Dislocation‐Driven Spiral Growth by Solvothermal Synthesis

Investigation of Phase Transition from Critical Nucleus to Bi2Te3 Nanoplate Based on Screw Dislocation‐Driven Spiral Growth by Solvothermal Synthesis

Optical and electronic transport properties of single-crystalline Bi<sub>2</sub>Te<sub>3</sub> hexagonal nanoplates determined by infrared spectroscopy and first-principles calculations

Measurement of thermal boundary resistance and thermal conductivity of single-crystalline Bi2Te3 nanoplate films by differential 3ω method

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Investigation of Phase Transition from Critical Nucleus to Bi₂Te₃ Nanoplate Based on Screw Dislocation‐Driven Spiral Growth by Solvothermal Synthesis

Investigation of Phase Transition from Critical Nucleus to Bi₂Te₃ Nanoplate Based on Screw Dislocation‐Driven Spiral Growth by Solvothermal Synthesis

Measurement of thermal boundary resistance and thermal conductivity of single-crystalline Bi₂Te₃ nanoplate films by differential 3ω method