Journal Highlight: High-density hotspots engineered by naturally piled-up subwavelength structures in 3D copper butterfly wing scales for SERS detection

Skip to Navigation

Ezine

  • Published: May 15, 2012
  • Channels: Raman
thumbnail image: Journal Highlight: High-density hotspots engineered by naturally piled-up subwavelength structures in 3D copper butterfly wing scales for SERS detection

High-density hotspots engineered by naturally piled-up subwavelength structures in three-dimensional copper butterfly wing scales for surface-enhanced Raman scattering detection

Advanced Functional Materials, 2012, 22, 1578-1585
Yongwen Tan, Jiajun Gu, Linhua Xu, Xining Zang, Dingxin Liu, Wang Zhang, Qinglei Liu, Shenmin Zhu, Huilan Su, Chuanliang Feng, Genlian Fan, Di Zhang

The 3D sub-micrometer Cu structures replicated from butterfly wing scales which provide excellent hierarchical structures for SERS, were successfully tuned by modifying the Cu deposition time, paving the way for slecting the optimal candidates to act as biotemplates. Abstract: Very recently, wing scales of natural Lepidopterans (butterflies and moths) manifested themselves in providing excellent three dimensional (3D) hierarchical structures for surface-enhanced Raman scattering (SERS) detection. But the origin of the observed enormous Raman enhancement of the analytes on 3D metallic replicas of butterfly wing scales has not been clarified yet, hindering a full utilization of this huge natural wealth with more than 175 000 3D morphologies. Herein, the 3D sub-micrometer Cu structures replicated from butterfly wing scales are successfully tuned by modifying the Cu deposition time. An optimized Cu plating process (10 min in Cu deposition) yields replicas with the best conformal morphologies of original wing scales and in turn the best SERS performance. Simulation results show that the so-called "rib-structures" in Cu butterfly wing scales present naturally piled-up hotspots where electromagnetic fields are substantially amplified, giving rise to a much higher hotspot density than in plain 2D Cu structures. Such a mechanism is further verified in several Cu replicas of scales from various butterfly species. This finding paves the way to the optimal scale candidates out of ca. 175 000 Lepidopteran species as bio-templates to replicate for SERS applications, and thus helps bring affordable SERS substrates as consumables with high sensitivity, high reproducibility, and low cost to ordinary laboratories across the world.

  • This paper is free to view for all users registered on separationsNOW.com until the end of July 2012.
    After this time, you can purchase it using Pay-Per-View on Wiley Online Library.

Social Links

Share This Links

Bookmark and Share

Microsites

Suppliers Selection
Societies Selection

Banner Ad

Click here to see
all job opportunities

Copyright Information

Interested in separation science? Visit our sister site separationsNOW.com

Copyright © 2017 John Wiley & Sons, Inc. All Rights Reserved