Synthesis of Polycrystalline Bismuth Telluride by a Metal-Organo Complex Method

Ritter, J. J.; Maruthamuthu, P.

doi:10.1021/ic00120a040

Cited by 47 publications

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“…Copper chalcogenides have been studied to a lesser extent to its closest of kin chalcogenides nanoparticulate (especially CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, PbS, PbTe, and PbSe) [1][2][3][4]. Copper chalcogenides have large number of applications in various devices such as in solar cells, super ionic conductors, photo detectors, photo thermal conversion, electro conductive electrodes, microwave shielding, coating, thermoelectric cooling, optical filter, and as a optical recording material [5][6][7][8][9][10][11][12]. Few pioneering reports have described synthetic route for copper selenide nanostructures preparation, focusing on their structural characterization and their photoluminescence properties [13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterizations, and optical properties of copper selenide quantum dots

Kumar

2010

Struct Chem

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We demonstrate the synthesis of copper selenide quantum dots (QDs) by element directed, inexpensive, straight forward wet chemical method which is free from any surfactant or template. Copper selenide QDs have been synthesized by elemental copper and selenium in the presence of ethylene glycol, hydrazine hydrate, and a defined amount of water at 70°C within 8 h. The product is in strong quantum confinement regime, phase analysis, purity and morphology of the product has been well studied by X-ray diffraction (XRD), UV-Visible spectroscopy (UV-Vis), Photo-luminescent spectroscopy (PL), Fourier transform infrared spectroscopy (FTIR), Transmission electron microscopy (TEM), High resolution transmission electron microscopy (HRTEM), and by Atomic force microscopy (AFM) techniques. The absorption and photoluminescence studies display large ''blue shift''. TEM and HRTEM analyses revealed that the QDs diameters are in the range 2-5 nm. Due to the quantum confinement effect copper selenide QDs could be potential building blocks to construct functional devices and solar cell. The possible mechanism is also discussed.

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Section: Introductionmentioning

confidence: 99%

Synthesis, characterizations, and optical properties of copper selenide quantum dots

Kumar

2010

Struct Chem

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“…30°C) precipitation by reacting tris(dimethylamine) bismuthine and bis(trimethylsilyl) telluride in hexane, and subsequent annealing at 160°C; [13] co-precipitation of bismuth and tellurium oxides in water followed by hydrogen reduction; [14] or through reduction of organometallic complexes. [15] Smaller (e.g., 20-40 nm) nanostructures can be realized by solvothermal techniques [16,17] using precursors in solvents such as N,N-dimethylformamide or water at 100-180°C in reducing ambients. The high temperatures or long reaction times in these reactions, however, are not conducive for obtaining nanostructures smaller than 20 nm, which is the size regime where quantumconfinement effects are expected to be significant.…”

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confidence: 99%

Molecularly Protected Bismuth Telluride Nanoparticles: Microemulsion Synthesis and Thermoelectric Transport Properties

et al. 2006

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The efficiency of thermoelectric devices is a function of the non-dimensional figure of merit ZT [1] of the material, whereT is the absolute temperature and Z = ra 2 /j; a = thermoelectric power or the Seebeck coefficient, r = electrical conductivity, j = thermal conductivity; the numerator of Z is referred to as the power factor. State-of-the-art thermoelectric materials usable for cooling and power generation have a ZT ∼ 1, whereas a ZT ∼ 4 is necessary to surpass competing technologies.[2] Factorial enhancements in ZT may be obtained by introducing nanoscopic geometrical confinement in one, two, or three dimensions, for example, nanolayered quantum-well superlattices, nanowires, and quantum-dot superlattices, respectively. [3][4][5][6] Increased scattering of heat carriers at interfaces and nanostructure boundaries are thought to decrease j, while changes in charge carrier density near the Fermi level offers possibilities for increasing r and a. [3,6,[7][8][9][10][11] Decreases in j have been observed across Bi 2 Te 3 /Sb 2 Te 3 nanolayer superlattices, [3] giving rise to approximately twofold increase of ZT (highest reported ZT ∼ 2.3). Even larger ZT increases (approximately fivefold compared with the bulk value) due mainly to the reduction of j have been observed in PbSeTe/ PbTe quantum-dot superlattices.[6] However, the magnitude of ZT is only ca. 1.6 since PbSeTe/PbTe bulk has a lower ZT than Bi 2 Te 3 /Sb 2 Te 3 . Lowering the thermal conductivity of materials with an inherently high ZT in the bulk form (e.g., bismuth telluride), by introducing 3D confinement, that is, producing nanoparticles, is expected to yield higher ZT values. This approach could also allow the tuning of quantum effects by tailoring the nanoparticle size and shape, to facilitate additional mechanisms for increasing ZT. Indeed, power-factor increases have been predicted to arise from such effects in wellorganized Si/Ge nanoparticle arrays.[11] Hence, synthesis and assembly of nanoparticles of bismuth telluride is of interest to enable the development of higher efficiency devices for thermoelectric cooling and power generation. Bismuth telluride nanoparticles with diameters of ca. 100 nm have been synthesized by several routes. Examples include melting the constituent elements in sealed vessels above 600°C; [12] low-temperature (ca. 30°C) precipitation by reacting tris(dimethylamine) bismuthine and bis(trimethylsilyl) telluride in hexane, and subsequent annealing at 160°C; [13] co-precipitation of bismuth and tellurium oxides in water followed by hydrogen reduction; [14] or through reduction of organometallic complexes. [15] Smaller (e.g., 20-40 nm) nanostructures can be realized by solvothermal techniques [16,17] using precursors in solvents such as N,N-dimethylformamide or water at 100-180°C in reducing ambients. The high temperatures or long reaction times in these reactions, however, are not conducive for obtaining nanostructures smaller than 20 nm, which is the size regime where quantumconfinement effects are expected to be signif...

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“…It was expected that ultrafine powders of Bi 2 Te 3 -based alloys with nano-sized diameters would make it easier to manufacture a high performance Bi 2 Te 3 -based thermoelectric material with sub-micrometer range microstructure via the powder metallurgy process. However, the synthesis and characterization of the Bi 2 Te 3 -based ultrafine powder with nano-sized diameter, which is used in thermoelectric applications, have rarely been studied [14][15][16]. Generally, Bi 2 Te 3 -based powders have been made by the melting-crushing and mechanical alloying methods.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Bi-Sb-Te thermoelectric material by the plasma arc discharge process

Lee

2011

Met. Mater. Int.

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The present study focused on the synthesis of Bi-Sb-Te-based ultrafine powder by way of the plasma arc discharge process. The DC arc current of the plasma arc was changed. The chemical composition, phase structure, and particle size of the synthesized powders were analyzed using XRF, XRD, XPS and FE-SEM. The synthesized powders were sintered by the spark plasma sintering method. The thermoelectric property of the sintered body was evaluated by measuring the electrical resistivity, Seebeck coefficient, and thermal conductivity. The synthesized Bi-Sb-Te-based powders had chemical compositions that differed from the raw material, Bi10Sb30Te60. The chemical compositions of the synthesized Bi-Sb-Te-based powders approached the raw material as the DC arc current increased. The synthesized Bi12Sb28Te60 powder had a mixed phase structure of the Bi0.5Sb1.5Te3, Bi2Te3, Sb2Te3, and Te phases. The particle size of the powder was less than 500 nm. The sintered body of the Bi12Sb28Te60 ultrafine powder synthesized by way of the plasma arc discharge process showed p-type thermoelectric characteristics.

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Synthesis of Polycrystalline Bismuth Telluride by a Metal-Organo Complex Method

Cited by 47 publications

References 0 publications

Synthesis, characterizations, and optical properties of copper selenide quantum dots

Synthesis, characterizations, and optical properties of copper selenide quantum dots

Molecularly Protected Bismuth Telluride Nanoparticles: Microemulsion Synthesis and Thermoelectric Transport Properties

Synthesis of Bi-Sb-Te thermoelectric material by the plasma arc discharge process

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