Syntheses of Bi2X3 (X = S, Se, Te) from elements under hydrothermal conditions

Tezuka, Keitaro; Kase, Saori; Shan, Yue Jin

doi:10.1016/j.jascer.2014.07.009

Cited by 8 publications

(3 citation statements)

References 23 publications

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“…It was also expressed that Bi 2 Te 3 nanostructures consisted of Bi and Te. Moreover, same results were also found in the other researcher reports [31]. In this investigation, some other impurities such as carbon and oxygen were observed in this sample.…”

Section: Developed Bi 2 Te 3 Nanostructure Pelletsupporting

confidence: 91%

Development of Bismuth Telluride Nanostructure Pellet for Thermoelectric Applications

Mamur

Bhuiyan²

2018

Hittite J. Sci. Eng.

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T he bismuth telluride (Bi 2 Te 3) is an efficient thermoelectric (TE) semiconductor type material. When the post transition metal elements of bismuth (Bi) is alloyed with a metalloid non-metal elements of tellurium (Te) then it makes a compound semiconductor material, Bi 2 Te 3. An acceptable TE material is indicated by large density and mobility of charge carriers, at the coinciding by the low thermal conductivity and high electrical conductivity. Another attractive aspect is that the efficient energy conversion adaptability of a TE material is performed by the extensive dimensionless figure of merit: ZT = (S 2 σT)/K, where S is the Seebeck coefficient, σ is the electrical conductivity, K is the thermal conductivity and T is the temperature. Nowadays, Bi 2 Te 3 nanostructure has a great deal of interest in thermoelectric applications such as thermoelectric heating and cooling, thermoelectric generators and portable power supply [1-10]. Recent studies suggest that Bi 2 Te 3 material usage in nanostructure form generates the higher ZT (from 0.62 to 1.13) values [11-17].

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Section: Developed Bi 2 Te 3 Nanostructure Pelletsupporting

confidence: 91%

Development of Bismuth Telluride Nanostructure Pellet for Thermoelectric Applications

Mamur

Bhuiyan²

2018

Hittite J. Sci. Eng.

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“…The recent progress in these materials is due to the possibility of enhancing the TE materials and devices efficiency at nano-scale through different approaches. Semiconductor compounds like bismuth telluride (Bi 2 Te 3 ) and other chalcogenides are gaining attention for use in thermoelectric devices and photoconductive materials because of their high TE performance [20][21][22]. However, the need of materials with adequate stability at high temperatures in the presence of high humidity has led to the search for new, and more efficient materials [23].…”

Section: Introductionmentioning

confidence: 99%

Preparation, structural characteristics and optical parameters of the synthesized nano-crystalline sulphur-doped Bi2Te2.85Se0.15 thermoelectric materials

Shalaby

Hashem

Yousif

et al. 2020

J Mater Sci: Mater Electron

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In the present work, a systematic preparation of Bi 2 Te 2.85 Se 0.15-x S x (x=0.0, 0.02, 0.04 and 0.06) compositions were carried out by solvothermal method. The materials were characterized by XRD, SEM, EDX, TEM and Raman spectroscopy.XRD, as well as TEM, to confirm the nanostructure of samples. The electrical and thermal properties were investigated in the temperature range from room temperature to 600 K. The highest power factor was 1.3 x 10 -2 mW/ K 2 m at 600 K for (x=0.06) sample. This improvement in the thermoelectric properties may be due to the ordered atomic arrangement of Bi, Te, and Se induced by sulphur in the Bi 2 Te 2.85 Se 0.15-x S x nano-composites, which was confirmed by X-ray diffraction (XRD) and Raman spectral analysis. The optical properties, such as energy gap, refractive index, extinction coefficient and dielectric constants, were obtained from the diffused reflectance data in the range of 200 to 800 nm. Sulphur doping influences the optical energy gap, reaching the lowest value for x=0.04 samples (0.14 eV), while the highest allowed energy gap was found in x=0.06 ones (0.41eV).

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“…Bismuth chalcogenides (Bi 2 X 3 , X = S, Se, Te) are semiconductor compounds that have gained atten-tion for use in photovoltaics, thermoelectric devices, photoconductive materials, and topological insulators [5][6][7]. Bi 2 Se 3 is one of the widely studied material because of its suitable optical properties.…”

Section: Introductionmentioning

confidence: 99%

Composition and morphology of copper bismuth selenide layer on glass prepared by chemical conversion technique

Osipovaitė¹,

Ancutienė²

2019

chemija

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A copper bismuth selenide layer prepared by the chemical conversion of a copper selenide layer on glass has been studied. SEM images display layers with a nonhomogeneous morphology. The copper selenide layer was non-uniform and consisted of dendrites and particulated agglomerates. The surface of the chemically converted layer was denser and smoother with closely spaced spherical grains. The EDX results reveal that the converted samples are rich in copper and poor in bismuth. The phases of copper selenides in the obtained layer and copper bismuth selenide and hexagonal selenium in the annealed converted layer were detected using the XRD analysis. Copper selenide peaks are most dominant with the hexagonal klockmannite phase.

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Syntheses of Bi₂X₃ (X = S, Se, Te) from elements under hydrothermal conditions

Cited by 8 publications

References 23 publications

Development of Bismuth Telluride Nanostructure Pellet for Thermoelectric Applications

Development of Bismuth Telluride Nanostructure Pellet for Thermoelectric Applications

Preparation, structural characteristics and optical parameters of the synthesized nano-crystalline sulphur-doped Bi2Te2.85Se0.15 thermoelectric materials

Composition and morphology of copper bismuth selenide layer on glass prepared by chemical conversion technique

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