Properties of Highly-Anisotropic Crystals

Givargizov, E. I.

doi:10.1007/978-94-009-3709-3_7

Cited by 5 publications

(4 citation statements)

References 39 publications

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“…As a result the only growth taking place is that enabled by the metallic catalyst which leads to anisotropic growth. Growth was targeted to produce Si NW ~15 μ m in length and 25 nm in diameter with Au at one end [ 21 , 22 ].…”

Section: Methodsmentioning

confidence: 99%

Pulmonary Toxicity, Distribution, and Clearance of Intratracheally Instilled Silicon Nanowires in Rats

Roberts

Mercer

Chapman

et al. 2012

Journal of Nanomaterials

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Silicon nanowires (Si NWs) are being manufactured for use as sensors and transistors for circuit applications. The goal was to assess pulmonary toxicity and fate of Si NW using an in vivo experimental model. Male Sprague-Dawley rats were intratracheally instilled with 10, 25, 50, 100, or 250 μg of Si NW (~20–30 nm diameter; ~2–15 μm length). Lung damage and the pulmonary distribution and clearance of Si NW were assessed at 1, 3, 7, 28, and 91 days after-treatment. Si NW treatment resulted in dose-dependent increases in lung injury and inflammation that resolved over time. At day 91 after treatment with the highest doses, lung collagen was increased. Approximately 70% of deposited Si NW was cleared by 28 days with most of the Si NW localized exclusively in macrophages. In conclusion, Si NW induced transient lung toxicity which may be associated with an early rapid particle clearance; however, persistence of Si NW over time related to dose or wire length may lead to increased collagen deposition in the lung.

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Section: Methodsmentioning

confidence: 99%

Pulmonary Toxicity, Distribution, and Clearance of Intratracheally Instilled Silicon Nanowires in Rats

Roberts

Mercer

Chapman

et al. 2012

Journal of Nanomaterials

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“…In general, the minimal size of nanowires is both dependent on nucleation thermodynamics and growth kinetics (energy stability theory). Meanwhile, it is also dependent on the Rayleigh instability of nanowire itself (linearized stability theory) , Namely, we could have an instability (usually called a subcritical instability) below the critical values of Rayleigh numbers determined by the linearized theory that can be in the energetically stable region.…”

Section: Theory Modelmentioning

confidence: 99%

Thermodynamic and Kinetic Size Limit of Nanowire Growth

Wang

Yang

et al. 2005

J. Phys. Chem. B

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“…Mechanism 4 would give an oxide NW growth rate that decreases with increasing catalyst diameter, which is not what we observe at long times. Moreover, diffusion through nanoscale liquid droplets is typically so fast [19] that it is not expected to limit VLS oxidation. Therefore, we consider it highly unlikely that mechanism 4 is the rate-limiting step for the longer-term VLS oxidation regime shown in figure 5.…”

Section: Resultsmentioning

confidence: 99%

Directed synthesis of germanium oxide nanowires by vapor–liquid–solid oxidation

Gunji

Thombare²,

Hu³

et al. 2012

Nanotechnology

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We report on the directed synthesis of germanium oxide (GeO(x)) nanowires (NWs) by locally catalyzed thermal oxidation of aligned arrays of gold catalyst-tipped germanium NWs. During oxygen anneals conducted above the Au-Ge binary eutectic temperature (T > 361 °C), one-dimensional oxidation of as-grown Ge NWs occurs by diffusion of Ge through the Au-Ge catalyst droplet, in the presence of an oxygen containing ambient. Elongated GeO(x) wires grow from the liquid catalyst tip, consuming the adjoining Ge NWs as they grow. The oxide NWs' diameter is dictated by the catalyst diameter and their alignment generally parallels that of the growth direction of the initial Ge NWs. Growth rate comparisons reveal a substantial oxidation rate enhancement in the presence of the Au catalyst. Statistical analysis of GeO(x) nanowire growth by ex situ transmission electron microscopy and scanning electron microscopy suggests a transition from an initial, diameter-dependent kinetic regime, to diameter-independent wire growth. This behavior suggests the existence of an incubation time for GeO(x) NW nucleation at the start of vapor-liquid-solid oxidation.

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Properties of Highly-Anisotropic Crystals

Cited by 5 publications

References 39 publications

Pulmonary Toxicity, Distribution, and Clearance of Intratracheally Instilled Silicon Nanowires in Rats

Pulmonary Toxicity, Distribution, and Clearance of Intratracheally Instilled Silicon Nanowires in Rats

Thermodynamic and Kinetic Size Limit of Nanowire Growth

Directed synthesis of germanium oxide nanowires by vapor–liquid–solid oxidation

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