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Title: Aluminum nanostructures with strong visible-range SERS activity for versatile micropatterning of molecular security labels
Authors: Lay, Chee Leng
Koh, Charlynn Sher Lin
Wang, Jing
Lee, Yih Hong
Jiang, Ruibin
Yang, Yijie
Yang, Zhe
Phang, In Yee
Ling, Xing Yi
Keywords: Security Labels
SERS Active Aluminum Structures
Issue Date: 2017
Source: Lay, C. L., Koh, C. S. L., Wang, J., Lee, Y. H., Jiang, R., Yang, Y., . . . Ling, X. Y. (2018). Aluminum nanostructures with strong visible-range SERS activity for versatile micropatterning of molecular security labels. Nanoscale, 10(2), 575-581. doi:10.1039/C7NR07793A
Series/Report no.: Nanoscale
Abstract: The application of aluminum (Al)-based nanostructures for visible-range plasmonics, especially for surface-enhanced Raman scattering (SERS), currently suffers from inconsistent local electromagnetic field distributions and/or inhomogeneous distribution of probe molecules. Herein, we lithographically fabricate structurally uniform Al nanostructures which enable homogeneous adsorption of various probe molecules. Individual Al nanostructures exhibit strong local electromagnetic field enhancements, in turn leading to intense SERS activity. The average SERS enhancement factor (EF) for individual nanostructures exceeds 104 for non-resonant probe molecules in the visible spectrum. These Al nanostructures also retain more than 70% of their original SERS intensities after one-month storage, displaying superb stability under ambient conditions. We further achieve tunable polarization-dependent SERS responses using anisotropic Al nanostructures, facilitating the design of sophisticated SERS-based security labels. Our micron-sized security label comprises two-tier security features, including a machine-readable hybrid quick-response (QR) code overlaid with a set of ciphertexts. Our work demonstrates the versatility of Al-based structures in low-cost modern chemical nano-analytics and forgery protection.
ISSN: 2040-3364
DOI: 10.1039/C7NR07793A
Schools: School of Physical and Mathematical Sciences 
Rights: © 2018 The Royal Society of Chemistry. All rights reserved. This paper was published in Nanoscale and is made available with permission of The Royal Society of Chemistry.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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