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Incommensurate van der Waals epitaxy of nanowire arrays: a case study with ZnO on muscovite mica substrates.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Utama, M. Iqbal Bakti Belarre, Francisco J. Magen, Cesar Peng, Bo Arbiol, Jordi Xiong, Qihua |
| Copyright Year | 2012 |
| Abstract | The requirement of lattice matching between a material and its substrate for the growth of defect-free heteroepitaxial crystals can be circumvented with van der Waals epitaxy (vdWE). However, the utilization and characteristics of vdWE in nonlamellar/nonplanar nanoarchitectures are still not very well-documented. Here we establish the characteristics of vdWE in nanoarchitectures using a case study of ZnO nanowire (NW) array on muscovite mica substrate without any buffer/seed layer. With extensive characterizations involving electron microscopy, diffractometry, and the related analyses, we conclude that the NWs grown via vdWE exhibit an incommensurate epitaxy. The incommensurate vdWE allows a nearly complete lattice relaxation at the NW-substrate heterointerface without any defects, thus explaining the unnecessity of lattice matching for well-crystallized epitaxial NWs on muscovite mica. We then determine the polarity of the NW via a direct visualization of Zn-O dumbbells using the annular bright field scanning transmission electron miscroscopy (ABF-STEM) in order to identify which atoms are at the base of the NWs and responsible for the van der Waals interactions. The information from the ABF-STEM is then used to construct the proper atomic arrangement at the heterointerface with a 3D atomic modeling to corroborate the characteristics of the incommensurate vdWE. Our findings suggest that the vdWE might be extended for a wider varieties of compounds and epitaxial nanoarchitectures to serve as a universal epitaxy strategy. |
| Starting Page | 1 |
| Ending Page | 9 |
| Page Count | 9 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www1.spms.ntu.edu.sg/~qihuagroup/data/Xiong/Papers/nl300554t%20-%20Iqbal%20-%20incommensurate%20vdWE.pdf |
| PubMed reference number | 22432695v1 |
| Alternate Webpage(s) | https://doi.org/10.1021/nl300554t |
| DOI | 10.1021/nl300554t |
| Journal | Nano letters |
| Volume Number | 12 |
| Issue Number | 4 |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Buffers Crystal Structure Document completion status - Documented Ellis-Van Creveld Syndrome Imagery MATCHING Nanowires Zinc Oxide polarity |
| Content Type | Text |
| Resource Type | Article |
