Response Stability Analysis of Printed Nanostructured TiO2-Based Disposable Ammonia Sensor Label

Aqueous solution of ammonia (NH3) is utilized in a variety of applications such as cleaning reagents, medication manufacture, fertilizer, farming, refrigeration, etc. To prevent unintentional health risks, it is crucial to have cost-effective deployable sensors to monitor the concentration. In this regard, a printed washable TiO2 nanoparticle (NP) layer-based sensing solution for ammonia detection can be a good choice. The sensor's response over a period of time was monitored to evaluate its performance, so that the concentration can be detected reliably. The sensor shows a sensitivity of 0.47/% for a range of 5% to 17% (aq. NH3 solution). Although the sensor shows current response till 1 day, but its magnitude decreases drastically due to crack formation. The sensor can be used reliably for up to 4 hr. and can be used to detect the presence of ammonia qualitatively for up to 1 day. Due to its simple fabrication, reusability, and easy set-up, the sensor is a viable option for detecting NH3 solution leaks in both homes and commercial buildings.