1.4.5 The Electronic Nose: The Effect of Metal Oxide Modifications to Well-Aligned ZnO Nanowire Arrays for Highly Sensitive and Selective Gas Detection

Haigio Su, Jiajun Chen, Kai Wang, Alaoddin Ahmad Ayyad & Weilie Zhou
To mimic biological olfactory receptor arrays, a three dimensional (3D) “electronic nose” was fabricated by using well-aligned ZnO nanowire arrays modified with different metal oxides. Metal oxide nanowire arrays share 3D structures similar to mammalian olfactory receptor arrays, with thousands of vertically aligned nanowires providing a high reception area which can significantly enhance the sensors’ sensitivity. Meanwhile, with different material decorations, each array of nanowires can produce a distinguishable response for each separate analyte, which...