Highly sensitive detection of processes occurring inside nanoporous anodic alumina templates : a waveguide optical study

Lau, K. H. A. and Tan, L. S. and Tamada, K. and Sander, M. S. and Knoll, W. (2004) Highly sensitive detection of processes occurring inside nanoporous anodic alumina templates : a waveguide optical study. Journal of Physical Chemistry B, 108 (30). pp. 10812-10818. ISSN 1520-6106 (https://doi.org/10.1021/jp0498567)

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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.

  • Item type:Article
    ID code:45501
    Dates:
    Date
    Event
    2004
    Published
    23 June 2004
    Published Online
    Notes:M1 - 30 Times Cited: 79
    Subjects:Science > Chemistry
    Department:Faculty of Science > Pure and Applied Chemistry
    Depositing user: Pure Administrator
    Date deposited:30 Oct 2013 12:16
    Last modified:08 Apr 2024 20:53
    URI:https://strathprints.strath.ac.uk/id/eprint/45501
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