Highly Sensitive Detection of Processes Occurring Inside Nanoporous Anodic Alumina Templates: A Waveguide Optical Study
Citations Over TimeTop 10% of 2004 papers
Abstract
We have applied nanoporous anodic alumina films as planar optical waveguides and studied changes in the effective dielectric constants of these thin films due to various processes occurring in the pores. We demonstrate the potential of the porous anodic alumina waveguide for high sensitivity (bio-) chemical sensing with bovine serum albumin adsorption and desorption at various pH values, with subangstrom sensitivity in the effective thickness of protein adsorbed. We also monitored pore widening (alumina dissolution) with subangstrom sensitivity, which is conceptually the reverse of detecting conformal film deposition on pore surfaces. Furthermore, we monitored the exchange of pore-filling media between phosphate buffer solution and ethanol, which produces qualitatively the same response as complete pore filling with other materials by various deposition techniques. Thus porous anodic alumina films may be employed simultaneously as deposition templates and as highly sensitive detectors of processes within the pores.
Related Papers
- → Biomaterial Immobilization in Nanoporous Carbon Molecular Sieves: Influence of Solution pH, Pore Volume, and Pore Diameter(2005)227 cited
- → Ordered metal nanostructureself-assembly using metal–organic frameworks as templates(2010)70 cited
- → High Aspect‐Ratio Cylindrical Nanopore Arrays and Their Use for Templating Titania Nanoposts(2008)39 cited
- → Microscopic Theory of Hysteretic Hydrogen Adsorption in Nanoporous Materials(2010)21 cited
- TECHNOLOGICAL PROGRESSES IN SYNTHESIS OF ULTRALOW DIELECTRIC CONSTANT NANOPOROUS SILICA FILMS(2003)