Thin nanoporous alumina-based SERS platform for single cell sensing

C. Toccafondi*, R. La Rocca, A. Scarpellini, M. Salerno, Gobind Das, S. Dante

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

Enhancing Raman signals of living cells has long been a challenge, and so far it has been achieved in most cases through cell labeling with gold nanoparticles. This work demonstrates the feasibility of analytical biosensors capable to detect living cells and assess their operation at the interface with the substrate based on gold-coated nanoporous alumina (APA) as an active SERS surface. Thin films of APA with increasing pore diameter and constant pore pitch were fabricated starting from evaporated Al with ∼500 nm thickness. After coating with a 25 nm-thick gold layer (Au-APA), preliminary characterization with test molecules proved such surfaces to be large area SERS substrates. Raman measurements were then performed on living cells cultured on Au-APA, which confirmed to be biocompatible, yielding Raman peaks related to the different components of the cells. The use of Au-APA allows the enhancement of the Raman scattering signals of those components, which become easily detectable with low laser power and short acquisition times and without the need of additional labels such as metal nanoparticles.

Original languageEnglish (US)
Pages (from-to)738-745
Number of pages8
JournalApplied Surface Science
Volume351
DOIs
StatePublished - Oct 1 2015

Keywords

  • Anodic porous alumina
  • Cell adhesion
  • Nanotopography
  • SERS

ASJC Scopus subject areas

  • Surfaces, Coatings and Films

Fingerprint Dive into the research topics of 'Thin nanoporous alumina-based SERS platform for single cell sensing'. Together they form a unique fingerprint.

Cite this