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Regensburg 2016 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 13: Poster: Nanoparticles, Nanocrystals and Composites

CPP 13.9: Poster

Montag, 7. März 2016, 18:15–21:00, Poster B2

Novel Growth Mechanism of ZnO Hexagonal Microtube Optical Resonators — •Jinxin Zhan1, Hongxing Dong1, Shulin Sun2, Xiaodong Ren3, Jianjun Liu3, Zhanghai Chen2, Chritoph Lienau4, and Long Zhang11Shanghai Institute of Optics and Fine Mechanics, 201800 Shanghai, China — 2Fudan University, 200433 Shanghai, China — 3Shanghai Institute of Ceramics, 200050 Shanghai, China — 4Carl von Ossietzky Universität, 26111 Oldenburg, Germany

Tubular micro/nanostructures have gained considerable interest for both fundamental scientific studies and practical applications due to their unique and delicate constructions [1-2]. However, for quite a long time, it was quite difficult to synthesize tubular structures for non-layered materials such as oxides, metals and nitrides because of the difficulties of controlling their dimensions.

Here we observed a novel growth mechanism of tubular ZnO microstructures. As demonstrated by a detailed growth study of ZnO crystals and by first-principles calculations, the formation of H2/H2O vapour changes the ZnO crystal surface energy and controls the geometry of ZnO micro/nanotubes.Furthermore, we demonstrated that the fabricated microtubes could be employed as tunable optical resonators. The effect of the unique tubular structure on the intensity modulations is discussed theoretically based on a plane wave model and finite-element-method (FEM) simulations, which agrees well with the experimental results.

[1] J. Xu et al., Adv. Mater. 26, 5337 (2014); [2] H. X. Dong et al., J. Mater. Chem. 20, 5510 (2010)

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