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xiejf

专家顾问 (文学泰斗)

[资源] Nature最新研究进展：可调控性质的纳米线的连续气相合成

最新一期的Nature杂志刊发了瑞典隆德大学科学家的研究成果。通过可控的利用金气溶胶作为引导剂，实现了半导体纳米线的快速连续的气相合成，生长速度达到惊人的1μm/s，且能实现半导体纳米线性能的调控。该工作对纳米线合成的工业化起到了推动作用。

Semiconductor nanowires are key building blocks for the next
generation of light-emitting diodes1, solar cells2 and batteries3.
To fabricate functional nanowire-based devices on an industrial
scale requires an efficient methodology that enables the mass production
of nanowires with perfect crystallinity, reproducible and
controlled dimensions and material composition, and low cost. So
far there have been no reports of reliable methods that can satisfy
all of these requirements. Here we show how aerotaxy, an aerosolbased
growth method4, can be used to grow nanowires continuously
with controlled nanoscale dimensions, a high degree of
crystallinity and at a remarkable growth rate. In our aerotaxy
approach, catalytic size-selected Au aerosol particles induce nucleation
and growth of GaAs nanowires with a growth rate of about
1 micrometre per second, which is 20 to 1,000 times higher than
previously reported for traditional, substrate-based growth of
nanowires made of group III–V materials5–7. We demonstrate that
the method allows sensitive and reproducible control of the nanowire
dimensions and shape—and, thus, controlled optical and electronic
properties—through the variation of growth temperature,
time and Au particle size. Photoluminescence measurements reveal
that even as-grown nanowires have good optical properties and
excellent spectral uniformity. Detailed transmission electron
microscopy investigations showthat our aerotaxy-grown nanowires
formalong one of the four equivalent Æ111æB crystallographic directions
in the zincblende unit cell, which is also the preferred growth
direction for III–V nanowires seeded by Au particles on a singlecrystal
substrate. The reported continuous and potentially highthroughput
method can be expected substantially to reduce the cost
of producing high-quality nanowires and may enable the lowcost
fabrication of nanowire-based devices on an industrial scale.
。
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[ 来自科研家族材料家族 ]

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附件 1 : Continuousgas-phasesynthesisofnanowireswithtunableproperties-S.pdf

2012-12-06 09:33:16, 1.39 M