Gas Sensors Lab
Metal oxide, Flexible and nanostructured sensors for SO2, CO, H2, NO2
Air Quality Monitoring Systems
Air pollution affects climate, water, crops, vegetation, animals, wildlife, and adversely impacts personal comfort and well-being. Thus it has become essential to develop reliable and low cost sensors for large scale deployment to monitor air pollutants. In the field of metal-oxide based gas sensors, the major challenges are to reduce the cost of sensors, improve reliability and long term stability with low order of detection, selectivity and low power consumption. Bulk production of nano-sized sensors, sensors on plastic sheets and new sensor device structure are few of the approaches to achieve low effective, low power and high selective sensors. However, the detection precision and response stability of these new architectures still needs more investigation. Currently, we are engaged in developing sensor array platform for portable devices, sensors for flexible electronic and new sensor device architectures for the selective detection of hazardous gases using CMOS compatible process.
Nanostructured Metal Oxide Gas Sensors:
Metal oxide gas sensors are promising for commercial applications. However most of the metal oxide gas sensors suffer from poor selectivity, stability and have high production costs. In order to reduce the cost of the sensors many researchers have focussed on developing gas sensors on low cost substrates like polymers. To improve sensitivity there are efforts to increase the surface to volume ratio by using nanostructures.
We are aiming to tackle the issue faced by conventional metal oxide gas sensors mainly of poor selectivity and high production cost. For improving selectivity we are working on metal oxide heterostructures with surface nanostructuing down to 30nm to enhance sensitivity along with good selectivity.
To reduce the cost of the sensors for mass production we are developing sensor array on flexible substrate with CMOS compatible processes. Sensor array consists of individually controlled microheater for four different sensing materials. The materials Vanadium Oxide, Zinc Oxide, Tin Oxide and Tungsten Oxide are used to measure the sensing characteristics for SO2, CO, H2, NO2.
Students: Chandra Shekhar Prajapati & Samatha Benedict