An Efficient Templating Approach for Synthesis of Highly Uniform CdTe and PbTe Nanowires

Liang, Hai‐Wei; Liu, Shuo; Wu, Qianying; Yu, Shu‐Hong

doi:10.1021/ic900245w

Cited by 85 publications

(76 citation statements)

References 49 publications

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“…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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“…Synthesis of PbTe nanowires chemically transformed from Te nanowires has been reported. 37 Thin and long PbTe nanorods (Fig. 6A) and thick and short PbTe nanorods (Fig.…”

Section: Chemical Transformation Into M X Te Y 1d Nanomaterialsmentioning

confidence: 97%

The effect of Se doping on the growth of Te nanorods

et al. 2015

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In this study, we successfully conducted a series of computationally-assisted experiments, regarding the morphology control and chemical transformation of Te nanorods. The morphology of Te nanorods is controlled by introducing a minute amount of isovalent Se dopant. Density-functional theory calculations predicted the Gibbs surface free energy change due to the adsorbent Se on the major facets of Te nanorods.Encouraged by the theoretical prediction, we conducted experiments on Te nanorod growth and did find significant variation of the morphology of Te nanorods due to Se injection. Furthermore, we demonstrated the chemical transformation of the shape-controlled Te nanorods to binary thermoelectric compounds such as PbTe and Bi 2 Te 3 without losing the tailored morphology. The transformed PbTe and Bi 2 Te 3 have nanoscale grain boundaries as seen from the cross-section HRTEM image. We emphasize that the robust production of morphology-controlled thermoelectric nanorods can be an optimal approach to develop an advanced thermoelectric composite material, by which the multiscale phonon scattering effect can be maximized.

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“…1 CdTe is an important semiconductor material with the near-infrared band gap and large bulk absorption coefficient. CdTe NWs have attracted great research interests [2][3][4][5][6][7][8][9][10][11] since its inception. 12 With the discovery of solution-liquid-solid (SLS) 13 process for NWs growth, a number of high quality solution-based semiconductor NWs were synthesized using low melting catalyst nanoparticles at low temperatures (T<400 C).…”

Section: Introductionmentioning

confidence: 99%

“…4 Meanwhile, a templating approach for synthesis of highly uniform CdTe NWs was developed using ultrathin Te NWs as templates. 5 Nonetheless, only straight CdTe NWs were obtained in these studies. [3][4][5] Herein we demonstrate a facile approach to both straight and branched CdTe NWs of high quality via a safe and economical procedure, in which CdO was used as Cd precursor and the amount of TOPO/TOP solvent mixture employed in each synthesis was largely reduced in comparison with the reported synthetic strategies.…”

Section: Introductionmentioning

confidence: 99%

“…5 Nonetheless, only straight CdTe NWs were obtained in these studies. [3][4][5] Herein we demonstrate a facile approach to both straight and branched CdTe NWs of high quality via a safe and economical procedure, in which CdO was used as Cd precursor and the amount of TOPO/TOP solvent mixture employed in each synthesis was largely reduced in comparison with the reported synthetic strategies. 2 The clear yellow stock solution of TBP-Te (0.04 M) was made by dissolving Te shot (0.32 g 2.5 mmol) in TBP (60 ml 20 mmol).…”

Section: Introductionmentioning

confidence: 99%

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Facile Synthesis of Straight and Branched CdTe Nanowires Using CdO as Precursor

Liu

Yang²,

Zhang³

et al. 2011

j nanosci nanotechnol

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High-quality colloidal CdTe nanowires (NWs) containing both straight and branched ones were controllably prepared via a solution-based approach, using a low melting Bi nanoparticles as catalysts, CdO and tributylphosphine telluride (TBP-Te) as precursors, and a tri-n-octylphosphine oxide/trin-octylphosphine (TOPO/TOP) mixture as solvent. The resulting straight CdTe NWs have typical diameters below 20 nm accompanying with lengths exceeding 10 m. In the case of branched CdTe NWs, tripod, V -shaped and y -shaped morphologies are obtained by decreasing the apparent Cd/Te molar ratio. It is found that, as the surface capping ligands, di-n-octylphosphinic acid (DOPA) is superior to decylphosphonic acid (DPA) in the reproducible growth of high-quality CdTe NWs. Since highly toxic dimethylcadmium, a cadmium precursor widely used in literatures, is replaced by CdO and the amount of the TOPO/TOP solvent mixture is significantly reduced, a relative safe and economical synthetic approach of high-quality colloidal CdTe NWs with controllable morphology is thus presented.

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An Efficient Templating Approach for Synthesis of Highly Uniform CdTe and PbTe Nanowires

Cited by 85 publications

References 49 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

The effect of Se doping on the growth of Te nanorods

Facile Synthesis of Straight and Branched CdTe Nanowires Using CdO as Precursor

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An Efficient Templating Approach for Synthesis of Highly Uniform CdTe and PbTe Nanowires

Cited by 85 publications

References 49 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

The effect of Se doping on the growth of Te nanorods

Facile Synthesis of Straight and Branched CdTe Nanowires Using CdO as Precursor

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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