Concurrent defects of intrinsic tellurium and extrinsic silver in an n-type Bi2Te2.88Se0.15 thermoelectric material

Kim, Cham; Yang, Yeokyung; Baek, Ju Young; Lopez, David Humberto; Kim, Dong Hwan; Kim, Ho-Young

doi:10.1016/j.nanoen.2019.03.047

Cited by 27 publications

(12 citation statements)

References 45 publications

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“…Bi 2 Te 3 , an emerging topological insulator layered material, has attracted massive interest because of its glamorous electronic properties. , As a typical topological insulator, Bi 2 Te 3 possesses conductive surface states which could permit dissipationless electric conduction at room temperature, that is, the flow of electrons on its surface is topologically protected against backscattering from defects and impurities, thus being mainly applied in thermoelectric devices. On the other hand, being a layered material, Bi 2 Te 3 simultaneously is a two-dimensional system with high specific surface areas and unprecedented optoelectronic properties that are important for sensing, catalysis, and energy exchange. − However, the nanosheets of layered Bi 2 Te 3 commonly stack into three-dimensional crystals through van der Waals interactions.…”

Section: Introductionmentioning

confidence: 99%

Highly Sensitive Photoelectrochemical Biosensor Based on Quantum Dots Sensitizing Bi₂Te₃ Nanosheets and DNA-Amplifying Strategies

Yuan

Zhong

et al. 2020

ACS Appl. Mater. Interfaces

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In this work, Bi2Te3 nanosheets treated with N-vinyl-pyrrolidinone showed highly sufficient and stable photocurrent for being used as a novel photoactive material. Accordingly, with CdTe quantum dots (QDs) sensitizing Bi2Te3 nanosheets, photoelectrochemical (PEC) biosensor coupling of DNA-amplifying strategies was constructed for sensitive miRNA-21 detection. Initially, the Bi2Te3 nanosheets on the electrode have conductive surface states with dissipationless electronic property, thus providing a highly stable photocurrent and a large surface-to-volume ratio. Then, with the participation of target miRNA-21 and auxiliary DNA, strand displacement amplification took place, thereby opening substantial DNA hairpins for triggering the next hybridization chain reaction (HCR). Through the HCR, long DNA tails decorated with CdTe QDs could thus be assembled on the electrode for enhancing the photocurrent of Bi2Te3 nanosheets. As a result, the proposed PEC biosensor showed a wide detection range from 10 fM to 100 pM with a detection limit of 3.3 fM, displaying a promising avenue to construct simple, ultrasensitive, and stable analytical techniques and tremendous potential in bioanalysis and early clinical diagnosis.

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Section: Introductionmentioning

confidence: 99%

Highly Sensitive Photoelectrochemical Biosensor Based on Quantum Dots Sensitizing Bi₂Te₃ Nanosheets and DNA-Amplifying Strategies

Yuan

Zhong

et al. 2020

ACS Appl. Mater. Interfaces

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“…Moreover, reducing the higher carrier concentration from the donor-like effect is also important for shifting the best thermoelectric performance to room temperature. 10,27 Strategies like solution-processed nanostructuring, 28−30 compositional control (such as doping Cu, 31−33 Ag, 34,35 Ge, 36 K 37 ) and mechanical deformation (mostly hot deformation, HD) 15,24,26,27,34,38−42 have been reported to manipulate the carrier concentration and other thermoelectric properties of the n-type Bi 2 Te 3 -based compounds. Various HD processes have been widely developed to optimize the carrier concentration and to reduce κ lat for enhancing the ZT, 15,24,26,27,34,38−43 and a state-of-the-art ZT of ∼1.3 at 450 K in the n-type Bi 2 Te 3−y Se y samples is realized by an HD approach.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Enhancement of the Thermoelectric and Mechanical Performance in One-Step Sintered n-Type Bi₂Te₃-Based Alloys via a Facile MgB₂ Doping Strategy

Chen

et al. 2019

ACS Appl. Mater. Interfaces

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The Bi 2 Te 3 -based alloys have been commercialized for the applications of energy harvesting and refrigeration for decades. However, the commercial Bi 2 Te 3 -based alloys produced by the zone-melting (ZM) method usually show poor mechanical strength and crack problems as well as the sluggish figure of merit ZT, especially for the less-progressed n-type samples. In this work, we have simultaneously enhanced the thermoelectric and mechanical performance of the one-step spark plasma sintering (SPS)-derived n-type Bi 2 Te 2.7 Se 0.3 alloys just by doping a small amount of superconducting material MgB 2 where Mg and B atoms can play significant roles in carrier density optimization and hardness enhancement. Besides the optimization of carrier density, the MgB 2 doping can also increase the carrier mobility but decrease the lattice and bipolar thermal conductivity, leading to a peak ZT of 0.96 at 325 K and an average ZT of 0.88 within 300−500 K in the 0.5% MgB 2 -doped Bi 2 Te 2.7 Se 0.3 (BTSMB) alloys. The peak ZT and average ZT of our optimized BTSMB samples are comparable and higher than those of the state-of-the-art commercial ZM ingot. Moreover, the optimized BTSMB sample also exhibits almost 70% enhancement in hardness compared with the ZM ingot. Our results demonstrate the great potential of the MgB 2 doping strategy for mass production of SPS-derived Bi 2 Te 3 -based alloys in one-step sintering.

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“…Thermoelectric materials with excellent characteristics, including a high Seebeck coefficient, a small electrical resistivity, and a low thermal conductivity, are always desired for enhancing the TEG's performance. Many novel approaches, including utilizing metal nanoparticles [24], nanoporous materials [25], carbon black particles [26], and metal doping [27,28], have been investigated to improve thermoelectric material's properties. Besides the effects of material properties, selecting proper physical dimensions of thermoelectric elements, such as the width and height of thermoelectric elements, could also contribute to better performance of the TEG [28].…”

Section: Thermoelectric Generator Structurementioning

confidence: 99%

Micro-Thermoelectric Generators: Material Synthesis, Device Fabrication, and Application Demonstration

Toàn¹,

Tuoi²,

Trung³

et al. 2023

Latest Research on Energy Recovery

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Micro-thermoelectric generator (TEG) possesses a great potential for powering wireless Internet of Things (IoT) sensing systems due to its capability of harvesting thermal energy into usable electricity. Herein, this work reviews the progress in recent studies on the micro-TEG, including material synthesis, device fabrication, and application demonstration. Thermoelectric materials are synthesized by the electrochemical deposition method. Three kinds of high-performance thermoelectric materials, including thick bulk-like thermoelectric material, Pt nanoparticles embedded in a thermoelectric material, and Ni-doped thermoelectric material, are presented. Besides the material synthesis, novel fabrication methods for micro-TEG can also help increase its output power and power density significantly. Two fabrication processes, micro/nano fabrication technology and assembly technology, are investigated to produce high-performance micro-TEG. Moreover, the fabircated micro-TEG as a power source for portable and wearable electronic devices has been demonstrated successfully.

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Concurrent defects of intrinsic tellurium and extrinsic silver in an n-type Bi2Te2.88Se0.15 thermoelectric material

Cited by 27 publications

References 45 publications

Highly Sensitive Photoelectrochemical Biosensor Based on Quantum Dots Sensitizing Bi₂Te₃ Nanosheets and DNA-Amplifying Strategies

Highly Sensitive Photoelectrochemical Biosensor Based on Quantum Dots Sensitizing Bi₂Te₃ Nanosheets and DNA-Amplifying Strategies

Simultaneous Enhancement of the Thermoelectric and Mechanical Performance in One-Step Sintered n-Type Bi₂Te₃-Based Alloys via a Facile MgB₂ Doping Strategy

Micro-Thermoelectric Generators: Material Synthesis, Device Fabrication, and Application Demonstration

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Concurrent defects of intrinsic tellurium and extrinsic silver in an n-type Bi2Te2.88Se0.15 thermoelectric material

Cited by 27 publications

References 45 publications

Highly Sensitive Photoelectrochemical Biosensor Based on Quantum Dots Sensitizing Bi2Te3 Nanosheets and DNA-Amplifying Strategies

Highly Sensitive Photoelectrochemical Biosensor Based on Quantum Dots Sensitizing Bi2Te3 Nanosheets and DNA-Amplifying Strategies

Simultaneous Enhancement of the Thermoelectric and Mechanical Performance in One-Step Sintered n-Type Bi2Te3-Based Alloys via a Facile MgB2 Doping Strategy

Micro-Thermoelectric Generators: Material Synthesis, Device Fabrication, and Application Demonstration

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Product

Resources

About

Highly Sensitive Photoelectrochemical Biosensor Based on Quantum Dots Sensitizing Bi₂Te₃ Nanosheets and DNA-Amplifying Strategies

Highly Sensitive Photoelectrochemical Biosensor Based on Quantum Dots Sensitizing Bi₂Te₃ Nanosheets and DNA-Amplifying Strategies

Simultaneous Enhancement of the Thermoelectric and Mechanical Performance in One-Step Sintered n-Type Bi₂Te₃-Based Alloys via a Facile MgB₂ Doping Strategy