Credit: (Georgia Tech Photo: Gary Meek)
Pictured here are three wireless devices that use carbon nanotubes (CNTs) to achieve high sensitivity to ammonia. At left is a patch antenna, inkjet-printed on photographic paper, with the CNTs shown in black. At top center is an omni-directional segmented loop antenna on a soft substrate, designed for potential 5.8 GHz RFID integration. At bottom right is an inter-digitated capacitor on silicon substrate with CNT loading across the electrodes, being tested for its DC resistance.