Publication date: 2nd November 2020
In current days, development and search of new materials for solid state thin film gas sensor to detect toxic gases, particularly using nanomaterial for their enhanced functionality, is growing rapidly as view point of both environmental and non invasive clinical application. Perovskite halides are popular as photovoltaic and optoelectronic materials. We have recently found highly sensitive and highly selective room temperature ammonia gas sensors can also be made from nano structured lead halide perovskite. In this abstract a heap, paper electronics based solid state gas sensor to detect NH3 gas selectively with sub ppm detection capability. The sensor is fabricated by perovskite halide CH3NH3PbI3 (MAPI) as the active sensor material grown on a paper. This paper based sensor works at room temperature. The paper based sensor has a visual detection limit of 10 ppm by simple color change method [1]. In this electrical sensor, the current increases by one order through the channel on exposure to only 10 ppm NH3 gas . The calibrated sensitivity is ~55% for 1ppm of NH3 gas in Nitrogen or Air. The current noise limited resolution estimated to be ~ 10 ppb [2]. This work establishes perovskite halide as a new solid state gas sensing material that can reach sub ppm sensitivity using simple paper electronics. Use of paper and also solution method used to grow the active material makes the sensor cost effective and easy to manufacture. This type of disposable high sensitive paper sensor can be used for detection of NH3 gas as a marker in exhaled breathes for non-invasive diagnosis. Being grown on the paper and since it supports unheated operation, needs less than few nanowatt powers for its operation. This makes the sensor very low power sensor as compared with the common metal oxide gas sensors. Thus, lead halide perovskites may act as next generation solid state gas sensor in a cost effective manner for rapid and selective detection of ammonia for room temperature operation.
The authors want to thank Department of Science and Technology (DST), Government of India for financial support partly through Technical Research Centre (TRC) project (No. AII1/64/SNB/2014(c)).
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