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Barnali Ghosh (Saha)

S N Bose National Centre for Basic Sciences, India

Title: Hybrid perovskite halide for detection of environmental pollutant in atmosphere


Biography: Barnali Ghosh (Saha)


In recent years, the organic/inorganic halide perovskites are emerging material and have attracted significant attention because of its various important application potentials like solar cells and other optoelectronic applications. Sensors based on thin films of different materials are widely used for various hazardous gas detection. These sensors with proper electrical readout, if made sensitive enough can even be used for non-invasive diagnosis of disease using the technique of breath analysis. While there are many electrical readout sensors that can detect hazardous gas typically with concentration ≥10 ppm, there are not too many visual (color change type) sensors that can easily detect hazardous gas with comparable sensitivity. Very recent developments of a visual color change-based sensor made using hybrid perovskite halide as working material led to detection of hazardous gas like ammonia with concentration <5 ppm with very high selectivity in room temperature. The low cost of the synthesis and the fact that it is made on a paper makes the sensor disposable. It is a low cost portable sensor for rapid, easy and selective detection of the atmospheric ammonia in open or closed environment by a simple color change effect, without the need for any other instruments. This visual sensor will be useful in places that can produce and emit ammonia gas in the environment such as food grain storage facilities, waste disposal sites and perishable materials storage facilities.