Executive Summary : | Gas sensors are crucial electronic devices used in various sectors, including smart air quality control, industries, food quality assessment, and non-invasive medical diagnostics. Researchers have explored various methods to detect hazardous gases, but many struggle with sensitivity, stability, selectiveness, response time, and recovery time. Metal oxide (MO)-based chemiresistive sensors have gained interest due to their safer, simple operation, portable, and economical properties. However, selective identification of trace VOCs and low ppb to ppm level gaseous pollutants in complex and unknown gas environments remains a concern. Researchers are working on developing the best techniques for stable, sensitive, reproducible, and selective identification of trace gases. The consumption of degrading air, water, and food quality raises life-threatening chemical species levels in living objects, leading to diseases such as liver, kidney, and brain failure. Therefore, selective detection of these trace gases is essential. A graphene oxide (GO)/MO (M=Ti, Zn, Sn) based chemiresistive sensor is proposed, which can selectively pick targeted gases based on their size from complex gases. GO with tuneable pore size can also be coated on MO sensors to increase conductivity. The project aims to focus on selective detection of gaseous pollutants like ammonia (0.29 nm) and H₂S (0.36 nm) in the environment and human exhaled breath for environmental safety and non-invasive diagnosis of kidney and liver-related diseases for medical applications. |