Fabrication of antimony telluride nanoparticles using a brief chemical synthetic process under atmospheric conditions

Kim, Cham; Kim, Dong Hwan; Han, Yoon Soo; Chung, Jong Shik; Kim, Ho-Young

doi:10.1016/j.jallcom.2010.10.002

Cited by 10 publications

(3 citation statements)

References 34 publications

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“…Bottom up chemical methods are commonly used because of their low cost, low investment need and possibility of scale-up of the synthesis process [ 26 ]. Different morphologies of Bi 2−x Sb x Te 3 including nanoparticles, nanoplates, nanocrystalline films, nanorods, nanotubes, nanowires and nanoflowers have been synthesized by reverse micelle [ 27 ], metal-organic chemical vapor deposition (MOCVD) [ 28 , 29 , 30 ], vapor–liquid–solid (VLS) [ 31 , 32 ], refluxing [ 33 , 34 , 35 , 36 ], electrodeposition [ 37 , 38 ], chemical reduction [ 39 , 40 ], solvothermal [ 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 ], hydrothermal [ 26 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 ], ultrasonic-assisted [ 59 , 60 , 61 ], and microwave (MW)-assisted [ 62 , 63 , 64 , 65 , 66 ] routes, to name a few. Among all these chemical syntheses methods, solvothermal/hydrothermal routes are the preferred methods to prepare nanostructures with different morphologies.…”

Section: Introductionmentioning

confidence: 99%

Minute-Made, High-Efficiency Nanostructured Bi2Te3 via High-Throughput Green Solution Chemical Synthesis

et al. 2021

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Scalable synthetic strategies for high-quality and reproducible thermoelectric (TE) materials is an essential step for advancing the TE technology. We present here very rapid and effective methods for the synthesis of nanostructured bismuth telluride materials with promising TE performance. The methodology is based on an effective volume heating using microwaves, leading to highly crystalline nanostructured powders, in a reaction duration of two minutes. As the solvents, we demonstrate that water with a high dielectric constant is as good a solvent as ethylene glycol (EG) for the synthetic process, providing a greener reaction media. Crystal structure, crystallinity, morphology, microstructure and surface chemistry of these materials were evaluated using XRD, SEM/TEM, XPS and zeta potential characterization techniques. Nanostructured particles with hexagonal platelet morphology were observed in both systems. Surfaces show various degrees of oxidation, and signatures of the precursors used. Thermoelectric transport properties were evaluated using electrical conductivity, Seebeck coefficient and thermal conductivity measurements to estimate the TE figure-of-merit, ZT. Low thermal conductivity values were obtained, mainly due to the increased density of boundaries via materials nanostructuring. The estimated ZT values of 0.8–0.9 was reached in the 300–375 K temperature range for the hydrothermally synthesized sample, while 0.9–1 was reached in the 425–525 K temperature range for the polyol (EG) sample. Considering the energy and time efficiency of the synthetic processes developed in this work, these are rather promising ZT values paving the way for a wider impact of these strategic materials with a minimum environmental impact.

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Section: Introductionmentioning

confidence: 99%

Minute-Made, High-Efficiency Nanostructured Bi2Te3 via High-Throughput Green Solution Chemical Synthesis

et al. 2021

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“…This might be due to the trade-off between a high PF and a low κ. As reported, the TE properties are extensively investigated by controlling the grain size/shape [23,24], grain alignment [25,26], and concentration of oxide impurity [27][28][29][30][31] to improve the TE performance by reducing κ and retaining a high PF. Indeed, the zT can be improved by reducing the κ via effective phonon scattering in polycrystalline nanostructured materials while maintaining a high PF by preserving the preferential alignment of nanograins [32].…”

Section: Introductionmentioning

confidence: 99%

Role of grain alignment and oxide impurity in thermoelectric properties of textured n-type Bi–Te–Se alloy

Bose¹,

Dilip²,

Mele³

et al. 2021

J. Phys. D: Appl. Phys.

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A nanostructured n-type Bi2Te2.7Se0.3 (BTS) alloy with a unique microstructure was prepared using a facile melting-rotation-quenching process followed by ball-milling and uniaxial hot-press sintering at 623 K. Anisotropy in the resulting microstructure showed anisotropic electrical and thermal transport properties in two directions normal to the pressing axis. The texture of the nanostructured BTS alloy was analyzed by x-ray diffraction and scanning electron microscopy. Based on the geometric phase analysis of a high resolution transmission electron microscopy images, abundant dislocations, high grain boundary density, and oxide impurity were identified, which act as phonon scattering centers. Higher anisotropy in thermal conductivity combined with oxide impurity resulted in an ultra-low phonon thermal conductivity of ∼0.305 W mK−1 at 423 K in the nanostructured n-type BTS in the direction parallel to the pressing axis. Laser power- and temperature-dependent Raman spectra analyses provided a deeper insight into the anisotropy in thermal transport properties. Optimum power factor and low thermal conductivity, due to the combination of grain alignment and oxide impurity, resulted in a dimensionless figure of merit (zT ) value of ∼0.75 at 423 K. In comparison, the high and opposite temperature dependences of electrical conductivity and thermal conductivity led to a better average zT value of ∼0.68 and a thermoelectric energy conversion efficiency percentage of ∼4.4% in the operating temperature range (300–423 K) in the direction parallel to the pressing axis.

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“…The prepared materials have grain boundaries and anisotropy due to their alignment. To improve the thermoelectric performance, the thermoelectric properties were extensively investigated by controlling the grain size [4], carrier concentration [5][6][7] and the crystal alignment [8][9][10], which can be controlled by using the spark plasma sintering (SPS) method with magnetic fields of different strengths. The alloys prepared by the SPS method have a mixed system containing the polycrystalline and powder phases.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of antimony telluride nanoparticles using a brief chemical synthetic process under atmospheric conditions

Cited by 10 publications

References 34 publications

Minute-Made, High-Efficiency Nanostructured Bi2Te3 via High-Throughput Green Solution Chemical Synthesis

Minute-Made, High-Efficiency Nanostructured Bi2Te3 via High-Throughput Green Solution Chemical Synthesis

Role of grain alignment and oxide impurity in thermoelectric properties of textured n-type Bi–Te–Se alloy

Effects of crystal-alignment and grain shape on the thermoelectric properties of Bi0.5Sb1.5Te3 alloys

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