Protein adsorption in porous silicon gradients monitored by spatially-resolved spectroscopic ellipsometry

L. M. Karlsson, M. Schubert, N. Ashkenov, H. Arwin

Research output: Contribution to journalConference articlepeer-review

33 Scopus citations


Porous silicon layers with a one-dimensional lateral gradient in pore size are prepared by electrochemical etching and characterized by spectroscopic ellipsometry in the visible to near-infrared region. The ellipsometer is equipped with a micro-spot option giving a lateral resolution of approximately 100 μm. By matching multiple-layer-model calculations to the laterally-resolved variable angle of incidence spectroscopic ellipsometry data, the thickness variation along the gradient as well as the in-depth porosity profile is mapped. Upon exposure to a protein solution, protein adsorption occurs on top of the porous silicon layer. At the high-porosity region of the gradient also penetration of protein molecules into the porous layer takes place. Ellipsometry data are recorded after protein exposure and variations of protein adsorption along the porous silicon gradient is modeled as well as the in-depth profile of protein penetration.

Original languageEnglish (US)
Pages (from-to)726-730
Number of pages5
JournalThin Solid Films
StatePublished - May 1 2004
Externally publishedYes
EventThe 3rd International Conference on Spectroscopic Ellipsometry - Vienna, Austria
Duration: Jul 6 2003Jul 11 2003


  • Porous silicon
  • Protein adsorption
  • Spatially-resolved spectroscopic ellipsometry

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry


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