Jump to main content
Jump to site search

Issue 2, 2018
Previous Article Next Article

Aluminum nanostructures with strong visible-range SERS activity for versatile micropatterning of molecular security labels

Author affiliations

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.

Graphical abstract: Aluminum nanostructures with strong visible-range SERS activity for versatile micropatterning of molecular security labels

Back to tab navigation

Supplementary files

Publication details

The article was received on 19 Oct 2017, accepted on 29 Nov 2017 and first published on 15 Dec 2017


Article type: Paper
DOI: 10.1039/C7NR07793A
Citation: Nanoscale, 2018,10, 575-581
  •   Request permissions

    Aluminum nanostructures with strong visible-range SERS activity for versatile micropatterning of molecular security labels

    C. L. Lay, C. S. L. Koh, J. Wang, Y. H. Lee, R. Jiang, Y. Yang, Z. Yang, I. Y. Phang and X. Y. Ling, Nanoscale, 2018, 10, 575
    DOI: 10.1039/C7NR07793A

Search articles by author

Spotlight

Advertisements