Application of Semiconductor Whisker Crystals in Low Temperature Electronics

Baitsar, Roman; Vainberg, V. V.; Varshava, S.S.

doi:10.1051/jp4:1996365

Cited by 3 publications

(5 citation statements)

References 2 publications

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“…Facile production of such morphologies under economical favorable conditions such as in aqueous phase and at relatively low temperature (<100 °C) is always required. Recently, Se−Te alloys have been found to demonstrate interesting temperature dependence of electrical resistivity . In addition, fine homogeneous nearly monodisperse Se−Te nanorods have also been synthesized simply by following hydrazine reduction .…”

Section: Introductionmentioning

confidence: 99%

“…Recently, Se-Te alloys have been found to demonstrate interesting temperature dependence of electrical resistivity. 10 In addition, fine homogeneous nearly monodisperse Se-Te nanorods have also been synthesized simply by following hydrazine reduction. 11 Hydrazine is a relatively weaker reducing agent than ammonia but it is best suited for a slow reduction of Se or Te precursors into their atomic forms.…”

Section: Introductionmentioning

confidence: 99%

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Nonideal Mixing of Se−Te in Aqueous Micellar Phase for Nanoalloys Over the Whole Mole Mixing Range with Morphology Control from Nanoparticles to Nanoribbons

Kaur

Bakshi

2009

J. Phys. Chem. C

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Se−Te alloy nanocrystals (NCs) were synthesized in aqueous micellar phase at 85 °C by using Na2SeO3/Na2TeO3 as Se/Te source in the presence of different amounts of hydrazine (i.e., 0.1−3.6 M) as reducing agent over the entire mole fraction range of Se (x Se) from x Se = 0 to 1. The shape, structure, and composition of alloy NCs were characterized by scanning electron microscopic (SEM), transmission electron microscopic (TEM), and energy dispersive X-ray spectroscopic (EDS) measurements. Despite many similar characteristic features of elemental Se and Te, a drastic change in the morphology of NCs was observed from x Se = 0 to 1. Amorphous water-soluble Se nanoparticles were obtained at x Se = 1 in the presence of excess of hydrazine, whereas long nanoribbons of several micrometers of Te were produced at x Se = 0. In the intermediate mole fractions, a smooth transition in the morphology from predominantly rhombohedral in the Se rich-region to long nanoribbons in the Te rich-region of the mixtures was observed. At relatively much lower hydrazine concentration, large plate-like morphologies were obtained at x Se = 1, while the morphologies at other mole fractions were slightly distorted with greater effect in the Se rich-region of the mixtures. A careful EDS analysis on each kind of morphology revealed a homogeneous mixing between elemental Se and Te but with a significantly nonideal behavior over the whole mole fraction range. All results were summarized in a phase diagram depicting the relationship between stochiometric amounts of Se and Te with their atomic percent in crystalline phase. NCs were always highly rich in the Te contents even in the Se rich-region of the mixtures and the overall growth was predominantly driven by metalloid (crystalline) nature of Te rather than nonmetallic (amorphous) nature of Se.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nonideal Mixing of Se−Te in Aqueous Micellar Phase for Nanoalloys Over the Whole Mole Mixing Range with Morphology Control from Nanoparticles to Nanoribbons

Kaur

Bakshi

2009

J. Phys. Chem. C

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“…Besides their intriguing properties, such as high photoconductivity [2], piezoelectricity [3], Se and Te nanostructures were excellent templates for the preparation of other nanomaterials [4,5]. Moreover, Se/Te alloys have already been shown to exhibit an unusual temperature dependence of their electrical resistivity, as well as their magnetoresistance highly sensitive to the composition [6]. Thus, it is thought that the controlled preparation of 1-D Se/Te alloys might introduce new types of applications in future nanodevices.…”

Section: Introductionmentioning

confidence: 99%

Spontaneous Oxidation Route to Se/Te Alloys Nanorods at Room Temperature

Zheng

Guo

Zheng

2011

AMR

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The Se/Te alloys nanorods have been synthesized through spontaneous oxidation of NaHE (E = Se and Te) by dissolved oxygen at room temperature. Phase structures and morphologies of the Se/Te products are investigated by XRD, EDS, SEM, and TEM. The composition of Se/Te alloys could be tuned via simply changing the value of n (n denoted as molar ratio of the starting reagent Se to Te). In order to obtain pure Se/Tealloys nanorods, the value of n should be higher than 3. Otherwise, by-product t-Te would be formed. A possible nucleation and growth mechanism of the Se/Te nanorods was discussed.

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“…Tellurium and selenium can also react with many other substances to form a wealth of functional materials, such as Bi 2 Te 3 , Bi 2 Se 3 , ZnTe, ZnSe, CdTe, and CdSe [8]. Alloys of Se-Te have also been reported to exhibit an unusual temperature dependence of their electrical resistivity [9]. Their magnetoresistance (MR) has also been found to be highly sensitive to the composition and may exhibit both positive and negative MR parts (due to the Kondo effect) [9].…”

Section: Introductionmentioning

confidence: 99%

“…Alloys of Se-Te have also been reported to exhibit an unusual temperature dependence of their electrical resistivity [9]. Their magnetoresistance (MR) has also been found to be highly sensitive to the composition and may exhibit both positive and negative MR parts (due to the Kondo effect) [9].…”

Section: Introductionmentioning

confidence: 99%

A general route for the rapid synthesis of one-dimensional nanostructured single-crystal Te, Se and Se–Te alloys directly from Te or/and Se powders

Zhou

Zhu

2006

Nanotechnology

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A general and template-free 'disproportionation and reversal' route was developed to synthesize one-dimensional (1D) nanostructures of Te, Se and Se-Te alloys directly from Te or/and Se powders. The products were characterized by x-ray diffraction (XRD), transmission electron microscopy (TEM), selected area electron diffraction (SAED), and scanning electron microscopy (SEM). Te nanorods and nanowires with a width varying from about 40 nm to about 300 nm, Se nanowires with a width of 60-100 nm and a length of 4-6 µm, and SexTe100-x alloy nanorods with x in a wide range, and with a width of 30-70 nm and an aspect ratio of three to five, were prepared. The mechanism of formation of the nanorods and nanowires and the effects of the experimental conditions, such as solution concentration, cooling rate, solvent nature and heating process, on the morphology and size of the products have been discussed. We believe that this general route and some other proper reversible processes between solid state and solution state can be extended to the transformations from various bulk materials into nanosized materials with various morphologies.

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Application of Semiconductor Whisker Crystals in Low Temperature Electronics

Cited by 3 publications

References 2 publications

Nonideal Mixing of Se−Te in Aqueous Micellar Phase for Nanoalloys Over the Whole Mole Mixing Range with Morphology Control from Nanoparticles to Nanoribbons

Nonideal Mixing of Se−Te in Aqueous Micellar Phase for Nanoalloys Over the Whole Mole Mixing Range with Morphology Control from Nanoparticles to Nanoribbons

Spontaneous Oxidation Route to Se/Te Alloys Nanorods at Room Temperature

A general route for the rapid synthesis of one-dimensional nanostructured single-crystal Te, Se and Se–Te alloys directly from Te or/and Se powders

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