Template-Stripped Multifunctional Wedge and Pyramid Arrays for Magnetic Nanofocusing and Optical Sensing
File(s)
Accepted version
Published version
Author(s)
Type
Journal Article
Abstract
We present large-scale reproducible fabrication of multifunctional ultrasharp metallic structures on planar substrates with capabilities including magnetic field nanofocusing and plasmonic sensing. Objects with sharp tips such as wedges and pyramids made with noble metals have been extensively used for enhancing local electric fields via the lightning-rod effect or plasmonic nanofocusing. However, analogous nanofocusing of magnetic fields using sharp tips made with magnetic materials has not been widely realized. Reproducible fabrication of sharp tips with magnetic as well as noble metal layers on planar substrates can enable straightforward application of their material and shape-derived functionalities. We use a template-stripping method to produce plasmonic-shell-coated nickel wedge and pyramid arrays at the wafer-scale with tip radius of curvature close to 10 nm. Further we explore the magnetic nanofocusing capabilities of these ultra-sharp substrates deriving analytical formulas and comparing the results with computer simulations. These structures exhibit nanoscale spatial control over the trapping of magnetic microbeads and nanoparticles in solution. Additionally, enhanced optical sensing of analytes by these plasmonic-shell-coated substrates is demonstrated using surface-enhanced Raman spectroscopy. These methods can guide the design and fabrication of novel devices with applications including nanoparticle manipulation, biosensing, and magnetoplasmonics.
Date Issued
2016-02-03
Date Acceptance
2016-02-03
Citation
Acs Applied Materials & Interfaces, 2016, 8 (14), pp.9319-9326
ISSN
1944-8252
Publisher
American Chemical Society
Start Page
9319
End Page
9326
Journal / Book Title
Acs Applied Materials & Interfaces
Volume
8
Issue
14
Copyright Statement
This is an open access article published under an ACS AuthorChoice License, which permits
copying and redistribution of the article or any adaptations for non-commercial purposes
copying and redistribution of the article or any adaptations for non-commercial purposes
License URL
Subjects
SERS
magnetic nanofocusing
magnetic trapping
magnetoplasmonics
template stripping
Nanoscience & Nanotechnology
0904 Chemical Engineering
0303 Macromolecular And Materials Chemistry
0306 Physical Chemistry (Incl. Structural)
Publication Status
Published