Plasmonic Metal-Insulator-Metal Capped Polymer Nanopillars for SERS Analysis of Protein-Protein Interactions

Lisa P. Hackett, Wenyue Li, Abid Ameen, Lynford L. Goddard, Gang Logan Liu

Research output: Contribution to journalArticle

Abstract

The advancement of SERS as an analytical tool requires substrates that provide both sensitive and reproducible measurements. In this work, a gold-titanium dioxide-gold metal-insulator-metal capped polymer nanopillar array SERS substrate is presented and optimized for SERS-based biosensing applications. The optical properties of the multilayered nanoantenna array are investigated using a combination of simulation and experimental studies. It is found that hot spot engineering, the plasmon resonance of the array, and cavity structure optimization all contribute to fundamental SERS sensor properties such as enhancement factor and enhancement factor uniformity, which are critically studied using this highly tunable device. A spatially averaged enhancement factor of (2.4 ± 0.8) × 107 with sufficient error for quantitative studies is demonstrated at an excitation wavelength of 633 nm. The label-free detection of protein-protein interactions on the metal-insulator-metal nanopillar array surface is then demonstrated including for the cancer biomarker cancer antigen 125 at a concentration of 100 ng/mL.

Original languageEnglish (US)
Pages (from-to)6255-6266
Number of pages12
JournalJournal of Physical Chemistry C
Volume122
Issue number11
DOIs
StatePublished - Mar 22 2018

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Polymers
Metals
insulators
proteins
Proteins
polymers
Gold
metals
augmentation
cancer
interactions
gold
biomarkers
antigens
Substrates
Antigens
Tumor Biomarkers
titanium oxides
Titanium dioxide
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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Cite this

Plasmonic Metal-Insulator-Metal Capped Polymer Nanopillars for SERS Analysis of Protein-Protein Interactions. / Hackett, Lisa P.; Li, Wenyue; Ameen, Abid; Goddard, Lynford L.; Liu, Gang Logan.

In: Journal of Physical Chemistry C, Vol. 122, No. 11, 22.03.2018, p. 6255-6266.

Research output: Contribution to journalArticle

Hackett, Lisa P. ; Li, Wenyue ; Ameen, Abid ; Goddard, Lynford L. ; Liu, Gang Logan. / Plasmonic Metal-Insulator-Metal Capped Polymer Nanopillars for SERS Analysis of Protein-Protein Interactions. In: Journal of Physical Chemistry C. 2018 ; Vol. 122, No. 11. pp. 6255-6266.
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