Abstract
Nanoporous anodic aluminium oxide (AAO) fabricated by self-ordering anodization process attracted remarkable attention, due to its highly ordered and size-controlled pore structures, the simple fabrication and exceptional properties. In their Letter on pp. 406–408 Kumeria and Losic present the application of AAO for optical gas sensing based on reflective interferometric spectroscopy (RiFS). The cover shows a scanning electron microscopy image of AAO pores, the scheme of light reflection from gold coated pore structures, the adsorption of gas molecules (H2S), and changes of the interference signal. The gas detection method is based on changes (shifting) of the interference signal from the metal coated AAO porous layer due to gas adsorption. By changing the metal coating or introducing specific surface chemistry, this method can be applied for sensing different gases in a range of applications.
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