Temperature-dependent growth of zinc-blende-structured ZnTe nanostructures

Meng, Qingfang; Jiang, Chunzhu; Mao, Scott X.

doi:10.1016/j.jcrysgro.2008.07.111

Cited by 55 publications

(54 citation statements)

References 33 publications

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“…The circular pattern indicates the presence of micrograins at this stage, in contrast to the regular spot pattern (Figure 2) characteristic for the perfect single crystalline nanowire before the decomposition. [10] It is well known that the lattice spacing in the ZnTe nanowire is 0.35 nm [4,7,10] and the measured spacing before decomposition agrees with this value. After decomposition, the lattice spacing was measured at different spots, indicated in Figure 8.…”

supporting

confidence: 62%

“…[5,15] It is believed that these Te aggregates form in layer structures or on the surface of nanowires where they can be detected by Raman analysis in small quantities. [7,15] The absence of Te peaks in our Raman data indicates that the ZnTe nanowire samples are uniform rather than layered, and the high quality of crystalline structures contain negligible surface states for Te aggregates to reside. Finally, since the radii of these nanowires are far larger than the Bohr radius, no quantum confinement effects are expected and the observed peaks are the same as those for the crystalline ZnTe thin film.…”

mentioning

confidence: 85%

“…In the case of ZnTe, widely varying structures ranging from cylindrical to tapered nanowires and nanoribbons were obtained depending on growth, temperature and other process parameters. [7,10] Nevertheless, a narrow temperature window was shown to yield nearly uniform diameter nanowires. [10] Applications in electronics, detectors, thermoelectric and other devices require the electrical characterization and investigation of the thermal stability under high applied currents.…”

Section: Introductionmentioning

confidence: 99%

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Thermal Breakdown of ZnTe Nanowires

et al. 2011

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As the applications for inorganic nanowires continuously grow, studies on the stability of these structures under high electrical/thermal stress conditions are needed. ZnTe nanowires are grown by the vapor-liquid-solid technique and their breakdown under Joule heating is studied through in situ monitoring in a transmission electron microscope (TEM). The experimental setup, consisting of a scanning tunneling microscope (STM) and a movable piezotube inside the TEM, allows the manipulation of a single nanowire. A voltage applied to the STM tip in contact with a ZnTe nanowire leads to the breakdown of the nanowire into Zn and Te particles or balls which is observed in real time. These balls grow by Ostwald ripening, rendering the surface morphology of the ZnTe nanowire progressively rough. Diffraction patterns along the stem of the wire after the partial breakdown showed substantially smaller lattice spacing compared to 0.35 nm for pristine ZnTe nanowires.

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supporting

confidence: 62%

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confidence: 85%

Section: Introductionmentioning

confidence: 99%

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Thermal Breakdown of ZnTe Nanowires

et al. 2011

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“…As the substrate temperature was quite high, both phases of the ZnS nanostructures were created in the mixture. The II-VI NWs entwined with the mixed ZB/ WS structures can be commonly observed along the (111) direction, such as ZnS, [22] ZnSe [23] and ZnTe [24]. It is known that the cubic to hexagonal phase transformation takes place at a temperature of \ 1020°C, which is the cubic-hexagonal phase transition temperature of bulk ZnS.…”

Section: Resultsmentioning

confidence: 99%

Growth temperature dependence of VLS-grown ultra-long ZnS nanowires prepared by CVD method

2018

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The synthesis of ultra-long high-quality zinc sulfide (ZnS) nanowires of uniform size on heterogeneous substrates is highly desirable for investigating the fundamental properties of ZnS nanowires and for fabricating integrated functional nanodevices. The present study developed a novel technique for growing ultra-long ZnS nanowires on thin-catalyst-coated substrates. ZnS nanowires were synthesized by chemical vapor deposition on a silicon substrate deposited by gold (* 5 nm in thickness) as the catalyst at 550, 600, 700, 750 and 800°C. The structural properties of the samples were investigated by X-ray diffraction, and the results showed that the fabricated nanowires have both wurtzite and zinc blend structures. The morphological properties of the nanowires were determined by scanning electron microscopy, and the results show that the substrate is thoroughly coated with 10 lm of zinc sulfide nanowires. Increasing the substrate temperature from 600 to 800°C increased the diameter of the nanowires and decreased the length. The growth mechanism of the nanowires was vapor-liquid-solid. The EDX spectra of this sample showed an absence of contamination, confirming the high purity of the ZnS nanowires.

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“…Bismuth (Bi) nanoparticles were used as seeds of 1D growth of ZnTe. ZnTe nanowires synthesized by the hydrogen-assisted thermal evaporation method in the presence of Au catalyst via the vapor-liquid-solid growth mechanism were also reported by Meng et al [27]. However, to date, study on the formation of ZnTe nanowires is in an infant stage.…”

Section: Introductionmentioning

confidence: 75%

Formation of 1-D ZnTe nanocrystals by aerosol-assisted spray pyrolysis

Kim

et al. 2011

Korean J. Chem. Eng.

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One-dimensional (1-D) ZnTe nanowires were prepared by aerosol-assisted spray pyrolysis using a mixture of ZnO (1 mmol)/OA (4 mL)/TOPO (0.8 g)/ODE (4 mL) as Zn precursor and Te/TOP (3 mL of 0.75 M) as Te precursor. The shape, size, and crystal structure of products were characterized by means of transmission electron microscope (TEM) and X-ray diffraction (XRD). The shape evolution of ZnTe nanocrystals from nanodots to nanowires was achieved by controlling the reaction temperature. ZnTe nanodots with average diameter of 8.3 nm were synthesized at 300 o C. "Earthworm-like" shaped ZnTe (linear ZnTe aggregates) consisting of primary ZnTe nanodots of about 16 nm in diameter were obtained at 400 o C. In addition, 1-D ZnTe nanowires were prepared at reaction temperature higher than 450 o C. Those experimental results suggest that ZnTe nanowires with zinc blende structure are formed from ZnTe nanodots by the oriented attachment due to insufficient surface capping of surfactant molecules and by strong dipole-dipole interaction of nanodots, followed by self-organization of linear aggregates at higher reaction temperatures. The linear ZnTe aggregates consisting of primary ZnTe nanodots may be an intermediate stage in the formation process of nanowires from nanodots.

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Temperature-dependent growth of zinc-blende-structured ZnTe nanostructures

Cited by 55 publications

References 33 publications

Thermal Breakdown of ZnTe Nanowires

Thermal Breakdown of ZnTe Nanowires

Growth temperature dependence of VLS-grown ultra-long ZnS nanowires prepared by CVD method

Formation of 1-D ZnTe nanocrystals by aerosol-assisted spray pyrolysis

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