Detection of ultra-low refractive index variations with colloidal nanoprobes

P. Andreakou, S. Hands, P. G. Lagoudakis

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


We implement a simple and fast technique to detect spectral shifts in the light scattering of gold nanoparticles due to refractive index changes of the surrounding medium. Spectral shifts are detected using spectrally balanced photon counting from the scattering spectrum of colloidal gold nanoparticles. We demonstrate the use of this technique for sensing ethanol concentration down to 0.1 M.

Original languageEnglish
Pages (from-to)1269-1271
Number of pages3
JournalSensors and Actuators, B: Chemical
Publication statusPublished - Aug 2012
Externally publishedYes


  • Ethanol
  • Gold nanoparticles
  • Optical sensor
  • Plasmon
  • Refractive index


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