Large-scale, ultrasensitive, highly reproducible and reusable smart sers platform based on pnipam-grafted gold grating

Olga Guselnikova, Pavel Postnikov, Yevgeniya Kalachyova, Zdenka Kolska, Milan Libansky, Jiri Zima, Vaclav Svorcik, Oleksiy Lyutakov

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

A smart plasmonic sensor based on periodic gold gratings grafted with poly(N-isopropyl acrylamide) (PNIPAm) has been designed and realized. Aperiodic gold structure was created onthe polymer backing with an excimer laser (1”2 cm2 modified area) and was subsequently covered by thin gold film. In the next step, a7nm thick PNIPAm layer was grafted to the gold surface through atwo-step procedure: covalent attachment of 4-carboxybenzil groups followed by carboxyl groups activation and their coupling with amino-terminated PNIPAm. Surface properties of the prepared structure and their switchable behavior were investigated using refractometry, wettability measurements, AFM in water, cyclic voltammetry, and pH-and temperature-dependent Z-potential measurements. The structure enables effective entrapment and SERS detection of azo dyes, significant reduction of minimal detectable concentration of target molecules, and adetection limit down to femtomolar concentrations. Excitation of plasmons on the well-ordered surface structure also gives excellent reproducibility for SERS along the particular sample surface and as well as on different samples. Additionally, the reversible switching of wettability under repeated temperature changes on the gold plasmonic platform allows multiple uses of the developed system.

Original languageEnglish
Pages (from-to)135-144
Number of pages10
JournalChemNanoMat
Volume3
Issue number2
DOIs
Publication statusPublished - Feb 2017

Keywords

  • Gold grating
  • Plasmonic sensor
  • PNIPAm
  • Surface grafting
  • Surfaceenhanced Raman spectroscopy (SERS)

ASJC Scopus subject areas

  • Biomaterials
  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Materials Chemistry

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