Nanoporous anodic alumina substrates (NAAOs) are fabricated using an inexpensive electrochemical method where self-ordered nanopore growth occurs upon the anodic oxidation of pure aluminum. The enhanced sensing performance of NAAOs is based on the immobilization of target molecules in the optical cavity provided by the nanopore channels.
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NAAO substrates are a promising sensor material due to their:
High Surface Area To Volume Ratio
Durability and Robustness
The enhanced sensing performance of NAAOs is based on the immobilization of target molecules in the optical cavity provided by the nanopore channels.
By combining NAAOs and reflection spectroscopy the oscillations in the optical response serves as a highly sensitive spectroscopic handle to monitor the molecular environment at the nanopores.
The detection of target molecules is based on changes in reflectivity on the surface of the sensor material.
IRS utilizes Fabry-Perot (FP) interference patterns in the NAAO reflectance spectrum to sense changes in the refractive index of the local environment.
Gold Coated AAOs (Au-NAAOs), are prepared by loading gold nanoparticle ink onto an uncoated NAAO. This increases the reflectivity at the nanopores providing an enhanced Fabry- Perot cavity for molecular detection.