Zno nanostructures fabricated through a double-tube vapor-phase transport synthesis

Chen, Y.X.; Lewis, Miles L.; Zhou, Weilie

doi:10.1016/j.jcrysgro.2005.04.087

Cited by 39 publications

(28 citation statements)

References 18 publications

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“…Due to the constraints that originated from liquid-phase catalyst nanoparticles, beyond onedimensional nanowires and nanorods, the VLS process seldom leads to the formation of complex structures. In general, the VS mechanism is the driving force behind the synthesis of many kinds of ZnO architectures and hierarchical nanostructures, such as tetrapods, 24 nanotubes, 25,26 nanoneedles, 27 nanohelices and nanosprings, 28 nanorings, 29 nanodisks, 25,30 nanodonuts, 31 nanobridges and nanonails, 32 nanopins, 33 nanocombs, 34 nanowalls, 35 nanoflowers, and so forth. 36 Under a certain environmental condition it could be controversial how the VLS and the VS mechanisms compete with each other and what roles the catalytic particles play in the growth process.…”

Section: Introductionmentioning

confidence: 99%

Controlling the Growth Mechanism of ZnO Nanowires by Selecting Catalysts

et al. 2007

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The effect of catalysts on ZnO nanowire growth was investigated by comparing the performances of Au, Pt, and Ag nanoparticles. Additional control of growth was achieved by implementing a substrate temperature of either 800 °C with a ZnO/graphite powder source or 500 °C with a Zn powder source. At 800 °C, the vaporliquid-solid mechanism plays a very important role when the Au and Pt nanoparticles are in the liquid phase. On the other hand, nanowires can also be grown on solid nanoparticles, that is, oxidized Ag at 800 °C and nanoscale cracks, that is, Pt at 500 °C, where, the vapor-solid is the only possible mechanism. At 500 °C, the vapor-liquid mechanism still dominates even though Au and Ag appear to be liquid, which is a result of high Zn vapor pressure.

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Section: Introductionmentioning

confidence: 99%

Controlling the Growth Mechanism of ZnO Nanowires by Selecting Catalysts

et al. 2007

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“…Figure 3a shows that the CCp sample surface presents microscopic particles (around 2-3 lm) on top of the CeO 2 film. Apparently, they might be faceted crystals, in the same way that obtained by vapour transport structures of ZnO, [18,19]. They seem to be spontaneously formed, probably due to the presence of precursor powder during the annealing; in the vapour transport process, a different atmosphere is created by precursor and/or intermediate compounds vapour, smoothing the surface generated by the pre-sprayed film.…”

Section: Methodsmentioning

confidence: 66%

“…A second modification to the conventional spray pyrolysis was to introduce 0.5 g of the precursor powder at 6 cm away from the deposited sample. In this way, during the thermal annealing, the oven would be filled by an atmosphere of the precursor compound, a technique known as vapour transport deposition, which has been intensively used to produce ZnO nanostructures and films [18][19][20][21].…”

Section: Methodsmentioning

confidence: 99%

Low-defect CeO2 films synthesis by combined spray pyrolysis using different precursors

et al. 2014

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CeO 2 films were fabricated by combining both a modified spray pyrolysis and the vapour transport deposition techniques. Two different precursors, cerium chloride and cerium acetate, were explored. In our approach, the pyrolytic process was not concomitant with the spray deposition and the introduction of the vapour transport condition has showed to improve both the morphological and optical quality of the films. Samples obtained from cerium chloride show a porous morphology, usual for polycrystalline CeO 2 layers, and a homogeneous light emission. When using vapour transport during thermal treatment, we achieved an enhanced luminescence, blue shifted to 3.08 eV and with negligible presence of defect bands. Films obtained from cerium acetate present similar crystalline properties, and a more defined light emission line shape, also peaked at 3.08 eV but with even lower contribution from known green-red defect bands. These results show that the proposed combined technique leads to CeO 2 films with homogeneous, enhanced optical properties.

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“…It offers the possibility to fabricate nanostructures by self-organization with a high degree of c-axis orientation. One-dimensional ZnO nanostructures have been synthesized successfully by high-temperature vapor-solid (VS) growth [10][11][12][13], electrochemical deposition [14], hydrothermal synthesis [15], and chemical vapor deposition (CVD) [16]. Nanowhiskers were grown by Wagner [12] on Au-catalyzed Si substrate at 950°C via a vapor-liquid-solid (VLS) mechanism.…”

Section: Introductionmentioning

confidence: 99%