Vapor–Solid–Solid Growth Mechanism Driven by Epitaxial Match between Solid AuZn Alloy Catalyst Particles and ZnO Nanowires at Low Temperatures

Campos, Leonardo; Tonezzer, Matteo; Ferlauto, André S.; Grillo, Vincenzo; Magalhães-Paniago, R.; Oliveira, Sabrynna Brito; Ladeira, Luiz Orlando; Lacerda, Rodrigo G.

doi:10.1002/adma.200701612

Cited by 60 publications

(54 citation statements)

References 39 publications

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“…Despite the possible influence of low pressure in Figure 4 Structure and morphology evolution under 200 keV electron irradiation in TEM: (a) TEM images showing a zigzag ZnS nanowire after a long period (I), a medium period (II), and a short period of exposure (III) to electron irradiation; (b) and (c) are respectively a typical SAED pattern corresponding to the zigzag ZnS nanowire body after a short period of electron irradiation and the resulting oxidized ZnS nanowire surface region; (d) and (e) are the ZnO nanoparticle networks formed after a long period of electron irradiation; (f) ZnS-ZnO core-shell nanocable formed after a medium period of electron irradiation; and (g) discontinuous surface oxide layer on the curved region of a ZnS nanowire after a short period of electron irradiation Nano Res (2009) 2: 966 974 decreasing the sublimation temperature of AuPd, there is unlikely to be liquid phase AuPd present in this growth system. Furthermore, although the nanoparticle size affects the melting temperature [23], it has been shown that the melting point drastically decreases only when the particle size is smaller than ~5 10 nm, and if the particles are larger than ~15-20 nm, the melting point is close to that of the bulk [24]. Since the AuPd alloy nanoparticles used in this study were larger than 80 nm in size, the size effect is negligible.…”

Section: Resultsmentioning

confidence: 72%

Zigzag zinc blende ZnS nanowires: Large scale synthesis and their structure evolution induced by electron irradiation

2009

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Large scale zigzag zinc blende single crystal ZnS nanowires have been successfully synthesized during a vapor phase growth process together with a small yield of straight wurtzite single crystal ZnS nanowires. AuPd alloy nanoparticles were utilized to catalyze a vapor-solid-solid growth process of both types of ZnS nanowires, instead of the more common vapor-liquid-solid growth process. Surprisingly, the vapor-phase grown zigzag zinc blende ZnS nanowires are metastable under high-energy electron irradiation in a transmission electron microscope, with straight wurtzite nanowires being much more stable. Upon exposure to electron irradiation, a wurtzite ZnO nanoparticle layer formed on the zigzag zinc blende ZnS nanowire surface with concomitant displacement damage. Both electron inelastic scattering and surface oxidation as a result of electron-beam heating occur during this structure evolution process. When prolonged higher-voltage electron irradiation was applied, local zinc blende ZnS nanowire bodies evolved into ZnS ZnO nanocables, and dispersed ZnS ZnO nanoparticle networks. Random AuPd nanoparticles were observed distributed on zigzag ZnS nanowire surfaces, which might be responsible for a catalytic oxidation effect and speed up the surface oxidation-induced structure evolution.

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Section: Resultsmentioning

confidence: 72%

Zigzag zinc blende ZnS nanowires: Large scale synthesis and their structure evolution induced by electron irradiation

2009

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“…However it is well known that size effects can modify the melting temperature. Calculations of the dependence of the melting point for Au and γ and β AuZn phases with the particles size reveal a significant decrease for particles under 5nm [10] [11]. The lowering of the melting temperature can account for the dewetting observed at 400°C.…”

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confidence: 93%

“…These nanotrenches all follow a common orientation along [0-1-1], but are not strictly parallel and their shape is irregular. Most of the gold particles of about 5 nm in diameter and with a density of about 50x10 10 /cm 2 are not located in the trenches. At 530 °C, (see Fig.…”

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confidence: 98%

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Epitaxial growth of ZnSe and ZnSe/CdSe nanowires on ZnSe

Bellet-Amalric¹,

Elouneg-Jamroz

Bougerol

et al. 2010

Phys. Status Solidi (c)

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We report the molecular beam epitaxy (MBE) growth of ZnSe nanowires (NWs) on a ZnSe(100) epilayer assisted by gold catalyst. Gold dewetting assists in the formation of nanotrenches along the [0‐1‐1] direction in the ZnSe buffer layer. Nucleation of the gold catalyst in the trenches leads to the growth of NWs preferentially in directions orthogonal to the trenches. The wires adopt mostly the wurtzite type structure and grow along the c‐axis. CdSe quantum dots were inserted in the ZnSe NWs. The CdSe insertions systematically adopt a cubic zinc‐blende arrangement with a [111] growth axis, as confirmed by transmission electron microscopy. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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“…4). This peak is attributed to the (330) plane of the γ-brass Au-Zn alloy [28]. Optical properties of the (Zn,Mn)O nanostructures at 300 K are shown in figure 5.…”

Section: +mentioning

confidence: 99%

Optical and magnetic properties of (Zn,Mn)O nanostructures synthesized by CVD method

Sharma

Gupta

Varma

2011

Cryst. Res. Technol.

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We report on microstructural, optical and magnetic properties of (Zn,Mn)O nanostructures synthesized by a chemical vapor deposition (CVD) technique. Average diameters of the as grown (Zn,Mn)O nanorods and nanowires were ~400 nm and ~50 nm, respectively. X-ray diffraction (XRD) and photoluminescence (PL) spectra provided the evidence that Mn was incorporated into ZnO lattice. PL spectra of the (Zn,Mn)O nanostructures showed shift in near band edge (NBE) emission at 396 nm together with a green band (GB) emission at 510 nm and a blue band (BB) emission at 460 nm. Magnetic measurements revealed mixed magnetic phases (ferromagnetic and antiferromagnetic) in the (Zn,Mn)O nanostructures. Vapor-solid-solid (VSS) mechanism was thought to be responsible for the growth of the nanostructures at low temperatures.

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Vapor–Solid–Solid Growth Mechanism Driven by Epitaxial Match between Solid AuZn Alloy Catalyst Particles and ZnO Nanowires at Low Temperatures

Cited by 60 publications

References 39 publications

Zigzag zinc blende ZnS nanowires: Large scale synthesis and their structure evolution induced by electron irradiation

Zigzag zinc blende ZnS nanowires: Large scale synthesis and their structure evolution induced by electron irradiation

Epitaxial growth of ZnSe and ZnSe/CdSe nanowires on ZnSe

Optical and magnetic properties of (Zn,Mn)O nanostructures synthesized by CVD method

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