In Situ Monitoring of Laser-Assisted Hydrothermal Growth of ZnO Nanowires: Thermally Deactivating Growth Kinetics
In Situ Monitoring of Laser-Assisted Hydrothermal Growth of ZnO Nanowires: Thermally Deactivating Growth Kinetics
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DOI：
10.1002/smll.201301599
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发表时间：
2014-02-01
期刊：
影响因子：
13.3
通讯作者：
Grigoropoulos, Costas P.
中科院分区：
文献类型：
--
作者：
In, Jung Bin;Kwon, Hyuk-Jun;Grigoropoulos, Costas P.
基于光学原位生长监测技术，研究了纳米线团簇的激光辅助水热生长动力学。其生长产量比使用批量加热的传统水热方法高出几个数量级。这一显著的改善归因于抑制了均相生长反应导致的前体耗尽，以及加强了质量传输。获得的原位数据表明，即使在可以忽略前驱体消耗的情况下，生长动力学也在逐渐衰减。结果表明，生长减速是由于纳米线生长过程中的散热引起的热失活所致。最后，证明了输入功率的定制时间调制能够实现扩展维度的持续增长。这些结果为高效利用生长前驱体提供了关键，这种功能金属氧化物半导体一直在追求工业用途。
The laser-assisted hydrothermal growth kinetics of a cluster of ZnO nanowires are studied based on optical in situ growth monitoring. The growth yields are orders of magnitude higher than those of conventional hydrothermal methods that use bulk heating. This remarkable improvement is attributed to suppression of precursor depletion occurring by homogeneous growth reactions, as well as to enhanced mass transport. The obtained in situ data show gradually decaying growth kinetics even with negligible precursor consumption. It is revealed that the growth deceleration is caused by thermal deactivation resulting from heat dissipation through the growing nanowires. Finally, it is demonstrated that the tailored temporal modulation of the input power enables sustained growth to extended dimensions. These results provide a key to highly efficient use of growth precursors that has been pursued for industrial use of this functional metal oxide semiconductor.