Flexible Ammonia Sensor using TiO₂

Fabrication of electronic devices on flexible substrates is gradually increasing due to its wide range of applications, flexibility in the substrate facilitates to use the devices in a mechanically stressed environments. In this work, flexible devices are fabricated to sense the volatile organic compound like ammonia using Titanium oxide nanoparticles (TiO₂). TiO₂ nanoparticles are synthesized by using hydrolysis and then characterized by UV-visible spectroscopy, scanning electron microscopy (SEM) and X-ray diffraction (XRD) to get the material properties. Further, electrodes are deposited on the polyethylene terephthalate (PET) substrate with a channel length of 100 μm using the lift-off method. Then, the TiO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> is deposited using a drop casting method to sense the ammonia gas. At room temperature devices detect minimum 50 ppm and performance is stable for three months.