Epitaxial II鈥揤I Tripod Nanocrystals: A Generalization of van der Waals Epitaxy for Nonplanar Polytypic Nanoarchitectures

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• 作者：Muhammad Iqbal Bakti Utama ; Qing Zhang ; Shuangfeng Jia ; Dehui Li ; Jianbo Wang ; Qihua Xiong
• 刊名：ACS Nano
• 出版年：2012
• 出版时间：March 27, 2012
• 年：2012
• 卷：6
• 期：3
• 页码：2281-2288
• 全文大小：463K
• 年卷期：v.6,no.3(March 27, 2012)
• ISSN：1936-086X

文摘

We report for the first time the synthesis of nonplanar epitaxial tripod nanocrystals of II鈥揤I compounds (ZnO, ZnS, ZnSe, ZnTe, CdS, CdSe, and CdTe) on muscovite mica substrate. With CdS as a case study, we conclude via Raman spectroscopy and electron microscopy studies that the tripods, which are found to be polytypic, followed a seeded growth mechanism. The epitaxy, manifested by the in-plane alignment of the legs of the tripods within a substrate, is attributed to the van der Waals interaction between the tripod bases and the mica surface, instead of to the covalent chemical bond which would require lattice matching between the epilayer and the substrate. The results demonstrated herein could have widespread immediate implications, including the potential of van der Waals epitaxy to be applicable in producing ordered arrays of more complex nanoarchitectures from various classes of compounds toward a broad range of technological applications.

Keywords:

van der Waals epitaxy; heteroepitaxy; II鈭扸I semiconductor; muscovite mica; nanostructures; nanotripods