Benchtop chemistry for the rapid prototyping of label-free biosensors: Transmission localized surface plasmon resonance platforms

Wei Ssu Liao, Xin Chen, Tinglu Yang, Edward T. Castellana, Jixin Chen, Paul S. Cremer

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Herein, a simple label-free biosensor fabrication method is demonstrated based on transmission localized surface plasmon resonance T-LSPR. The platform, which consists of a silver nanoparticle array, can be prepared in just a few minutes using benchtop chemistry. The array was made by a templating technique in conjunction with the photoreduction of Ag ions from solution. This metal surface was functionalized with biotin-linked thiol ligands for binding streptavidin molecules from solution. For an array of 19 nm diameter silver nanoparticles, a redshift in the T-LSPR spectrum of 24 nm was observed upon protein-ligand binding at saturation. The binding constant was found to be 2 × 1012 M-1. Platforms were also fabricated with silver nanoparticles of 34, 55, and 72 nm diameters. The maximum LSPR wavelength shift was nanoparticle size dependent and the maximum sensitivity was obtained with the smaller nanoparticles.

Original languageEnglish (US)
Pages (from-to)80-85
Number of pages6
JournalBiointerphases
Volume4
Issue number4
DOIs
StatePublished - Dec 2009

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Biomaterials
  • Materials Science(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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