Thin film gas sensor for detection of toxic and hazardous gases is a well researched area and is growing rapidly due to application potentials and also for development of new materials, in particular, nanomaterials that have enhanced functionality. The sensor formed on the paper, since it supports unheated operation, needs less than few nanowatt power for its operation. This type of disposable high sensitive paper sensor can be used for detection of NH 3 as a marker in exhaled breathes for non-invasive diagnosis. Use of paper and also solution method used to grow the active material makes the sensor cost effective and easy to manufacture. This work establishes perovskite halide as a new solid state gas sensing material that can reach sub ppm sensitivity using simple paper electronics. The current noise limited resolution estimated to be ~10 ppb. The calibrated sensitivity is ~55% for 1 ppm of NH 3 gas in Nitrogen or Air. The current through the paper sensor increases by one order on exposure to only 10 ppm NH 3 gas. This paper based sensor works at room temperature. The sensor uses perovskite halide CH 3NH 3PbI 3 (MAPI) as the active sensor material grown on a paper. In this paper we report a cheap, paper electronics based solid state gas sensor to detect NH 3 gas selectively with a detection capability of better than 1 ppm.
0 kommentar(er)
