Affiliation:
1. School of Chemical and Biomolecular Engineering The University of Sydney Sydney NSW 2006 Australia
2. Sydney Nano Institute The University of Sydney Sydney NSW 2006 Australia
3. Chuangqi Shidai Qingdao Technology Co. Ltd. (CSQT) Qingdao International R&D Park Licang Qingdao 266104 China
4. School of Chemical Engineering University of New South Wales (UNSW) Sydney NSW 2052 Australia
Abstract
AbstractBreath analysis is a non‐invasive tool used in medical diagnosis. However, the current generation of breath analyzers is expensive, time‐consuming, and requires sample gas separation. In this work, a simple, yet effective, low‐cost ammonia gas sensor based on poly(2‐acrylamido‐2‐methyl‐1‐propanesulfonic acid) is presented for non‐invasive medical diagnosis. The designed sensor has a broad detection range to ammonia gas up to 1000 ppm with a limit of detection of 30 ppb. This is a robust sensor, which functions at high relative humidity (RH) (>90%) and exhibits consistent electrical responses under different test conditions. The result of a blind test validates the sensor's selective response to ammonia in the presence of other gases such as carbon dioxide. Furthermore, it is viable to integrate this sensor into a mask for real‐time ammonia gas detection accurately. Overall, this study demonstrates the feasibility of developing a simple, non‐invasive, and cost‐effective sensor for real‐time monitoring of ammonia gas with high potential in applications such as medical diagnostics, food safety, and environmental conditions.
Funder
Australian Research Council