Controlled Hydrothermal Synthesis of Thin Single-Crystal Tellurium Nanobelts and Nanotubes

Mo, Maosong; Zeng, Jinghui; Liu, Xianming; Yu, Weichao; Zhang, Shuyuan; Qian, Yitai

doi:10.1002/1521-4095(20021118)14:22<1658::aid-adma1658>3.0.co;2-2

Cited by 324 publications

(245 citation statements)

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“…Thus, for a special purpose to develop a more convenient and rapid way for synthesising Bi 2 Te 3 nanostructures is sorely required. During the past decade, low-cost and less hazardous direct wetchemical route has been used to synthesise some nanostructures, such as films, nanorods, nanowires and nanobelts of oxides, metals, semimetal, alloys and other compounds [22][23][24][25]. Furthermore, the two-step Te template-directed synthesis is one of the most popular strategies for the fabrication of telluride nanostructures and uses N 2 H 4 .H 2 O as a common reducing agent [26][27][28][29][30][31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Low temperature reduction route to synthesise bismuth telluride (Bi₂Te₃) nanoparticles: structural and optical studies

Srivastava

2013

Journal of Experimental Nanoscience

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Herein, we report the synthesis of highly yielded bismuth-telluride (Bi 2 Te 3 ) nanoparticles at 50 C by direct wet chemical route in which the bismuth and tellurium precursors have been dissolved in deionised water, ethylene glycol and hydrazine hydrate. This method is very facile, inexpensive and less hazardous and ensures almost complete yield of the precursors. The powder product was well characterised by powder X-ray diffraction, UV-Vis spectroscopy, Fourier transform infrared spectroscopy, energy dispersive X-ray diffraction, transmission electron microscopy and scanning electron microscopy. It is investigated that the synthesised powder has a rhombohedral structure of Bi 2 Te 3 with average diameters of the particles about 35 nm. Thus, the synthesis process has been modified to design nanostructures of thermoelectric materials with related crystal structures.Keywords: nanostructures; chemical synthesis; electron microscopy; X-ray diffraction; optical properties IntroductionTransition-metal chalcogenides in nanocrystalline form exhibit numerous interesting and useful characteristic properties that differ from their bulk counterpart. As a consequence of the quantum confinement effect, nanomaterials have received attention due to their size-dependent optical, physical, mechanical, thermal and chemical properties. During the past few decades, with the rapid enlargement of human population, the consumption of traditional energy has increased exponentially. Therefore, more and more researchers come to pay close attention to new sources of energy. Thermoelectric (TE) device emerges as a new kind of hot substance that can directly achieve the conversion between heat and electricity, which can maximise the use of waste heat and electricity in daily life. TE materials can convert waste heat energy to useful electrical energy for power generation and imperative applications in thermoelectric micro-cooling devices. The properties of a TE material can be explained by the energy conversion efficiency which mainly depends on the material's dimensionless TE figure-of-merit (ZT) ¼ sS 2 T/k, where s is the electrical conductivity, S is the Seebeck coefficient, T is the operating temperature and k is the thermal conductivity. The quantity 'S 2 s' is commonly considered as 'power factor'. An increment in power factor and a decrease in thermal conductivity are essential requirements for the enhancing ZT value. For a fine TE material, it posses high 's' and a low 'k'. Spongy TE materials [1] such as skutterudites [2] and clathrate crystals [3]

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Section: Introductionmentioning

confidence: 99%

Low temperature reduction route to synthesise bismuth telluride (Bi₂Te₃) nanoparticles: structural and optical studies

Srivastava

2013

Journal of Experimental Nanoscience

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“…There are many investigations on carbon nanotubes, including synthesis, physical properties, application etc. 1 [10][11][12] nitrides (GaN, B 24 N 24 ), [13][14] Si, Te, noble-metal nanotubes (Ag, Au, Pt, Pd), [15][16][17] titanate nanotubes 18 and copolymer nanotubes, 19 but reports on the synthesis of ZnS nanotubes are scarce. 20,21 Most nanotubes that have been synthesized are open-ended linear tubes.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of ZnS nanotubes with crossed-channels

Chen

Ding

2007

J. Braz. Chem. Soc.

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Nanotubos de ZnS em forma de X foram sintetizados usando um método hidrotérmico. Uma nova reação hidrotérmica envolvendo hidrólise e oxidação simultâneas do solvente foi desenvolvido usando zinco em pó, água e NH 2 CSNH 2 como reagentes. As imagens de microscopia de transmissão eletrônica mostram que cada segmento dos canais tem cerca de 400 a 500 nm de comprimento. O diâmetro interno é 50 nm e o externo 70 nm e o espaço entre as camadas é cerca de 7 nm. Dados de difração de raios (XRD) mostram que o nanotubo obtido apresenta boa cristalização na fase Esfalerita cúbica. A banda em 293 nm no espectro de absorção no ultravioleta-visível encontra-se deslocado para o azul em cerca de 50 mm em relação ao ZnS bulk. O espectro de fotoluminescência dos nanotubos de ZnS mostra que o pico de emissão ocorre em 409 nm quando excitado a 365 nm.ZnS nanotubes with crossed-channels have been synthesized successfully using a hydrothermal method. A novel hydrothermal reaction of simultaneous solvent-oxidationhydrolysis has been developed using Zn powder, H 2 O and NH 2 CSNH 2 as reagents. TEM images show that each branch of the channels is about 400-500 nm long. The inner diameter is 55 nm, the outer diameter is 70 nm, and the interlayer spacing is about 7 nm. XRD data show that the product is well-crystallized in the cubic Sphalerite phase. The peak appears at 293 nm in the UV-Vis absorption spectrum, which is about 50 nm blue shifted from the bulk counterpart. The photoluminescence spectrum of ZnS nanotubes shows that the emission peak occurs at 409 nm when excited at 365 nm.

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“…As reactions were most probably occurred in aqueous solution, solvent-thermal growth method was well known as hydrothermal growth method. It is a simple, reliable and effective www.intechopen.com Synthesis, Self-assembly and Optoelectronic Properties of Monodisperse ZnO Quantum Dots 219 method in synthesizing nanomaterials with different shapes under low supersaturation and mild conditions [16,[76][77][78]. ZnO QDs [41][42][43] as well as other nanostructures, such as nanowires, nanorods, nanotubes and other special shapes [79][80][81][82][83], has been fabricated using hydrothermal growth method.…”

Section: Chemical Methods On Synthesis Of Zno Qdsmentioning

confidence: 99%

Synthesis, Self-assembly and Optoelectronic Properties of Monodisperse ZnO Quantum Dots

Mei¹,

Hu²

2011

Optoelectronic Devices and Properties

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Controlled Hydrothermal Synthesis of Thin Single-Crystal Tellurium Nanobelts and Nanotubes

Cited by 324 publications

References 6 publications

Low temperature reduction route to synthesise bismuth telluride (Bi₂Te₃) nanoparticles: structural and optical studies

Low temperature reduction route to synthesise bismuth telluride (Bi₂Te₃) nanoparticles: structural and optical studies

Synthesis and characterization of ZnS nanotubes with crossed-channels

Synthesis, Self-assembly and Optoelectronic Properties of Monodisperse ZnO Quantum Dots

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Controlled Hydrothermal Synthesis of Thin Single-Crystal Tellurium Nanobelts and Nanotubes

Cited by 324 publications

References 6 publications

Low temperature reduction route to synthesise bismuth telluride (Bi2Te3) nanoparticles: structural and optical studies

Low temperature reduction route to synthesise bismuth telluride (Bi2Te3) nanoparticles: structural and optical studies

Synthesis and characterization of ZnS nanotubes with crossed-channels

Synthesis, Self-assembly and Optoelectronic Properties of Monodisperse ZnO Quantum Dots

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Product

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Low temperature reduction route to synthesise bismuth telluride (Bi₂Te₃) nanoparticles: structural and optical studies

Low temperature reduction route to synthesise bismuth telluride (Bi₂Te₃) nanoparticles: structural and optical studies