Size-Induced Switching of Nanowire Growth Direction: a New Approach Toward Kinked Nanostructures
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- 作者：Youde Shen ; Oleg I. Lebedev ; Stuart Turner ; Gustaaf Van Tendeloo ; Xiaohui Song ; Xuechao Yu ; Qijie Wang ; Hongyu Chen ; Shadi A. Dayeh and Tom Wu
- 刊名：Advanced Functional Materials
- 出版年：2016
- 出版时间：June 7, 2016
- 年：2016
- 卷：26
- 期：21
- 页码：3687-3695
- 全文大小：2067K
- ISSN：1616-3028
文摘
Exploring self-assembled nanostructures with controllable architectures has been a central theme in nanoscience and nanotechnology because of the tantalizing perspective of directly integrating such bottom-up nanostructures into functional devices. Here, the growth of kinked single-crystal In2O3 nanostructures consisting of a nanocone base and a nanowire tip with an epitaxial and defect-free transition is demonstrated for the first time. By tailoring the growth conditions, a reliable switching of the growth direction from [111] to [110] or [112] is observed when the Au catalyst nanoparticles at the apexes of the nanocones shrink below ≈100 nm. The natural formation of kinked nanoarchitectures at constant growth pressures is related to the size-dependent free energy that changes for different orientations of the nanowires. The results suggest that the mechanism of forming such kinked nanocone–nanowire nanostructures in well-controlled growth environment may be universal for a wide range of functional materials.