Journal
MATERIALS SCIENCE & ENGINEERING C-BIOMIMETIC AND SUPRAMOLECULAR SYSTEMS
Volume 29, Issue 1, Pages 92-96Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.msec.2008.05.013
Keywords
ZnO; Cathodoluminescence; Templates
Categories
Funding
- National Natural Science Foundation of China [50371055]
- Major Fundamental Research Project of the Shanghai Science and Technology Committee [07DJ14001]
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Papilio paris butterflies have an iridescent blue color patch on their hind wings which is visible over a wide viewing angle. Optical and scanning electron microscopy observations of scales from the wings show that the blue color scales have very different microstructure to the matt black ones which also populate the wings. Scanning electron micrographs of the blue scales show that their surfaces comprise a regular two-dimensional array of concavities. By contrast the matt black scales have fine, sponge-like structure, between the ridges and the cross ribs in the scales. Using both types of scale as bio-templates, we obtain zinc oxide (ZnO) replicas of the microstructures of the original scales. Room temperature (T=300 K) cathodoluminescence spectra of these ZnO replicas have also been studied. Both spectra show a similar sharp near-bandedge emission, but have different green emission, which we associate with the different microstructures of the ZnO replicas. (C) 2008 Elsevier B.V. All rights reserved.
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