Abstract
Abstract Donut-shaped hematite (α-Fe2O3) nanoparticles were synthesized using facile chemical colloidal method for the development of high performance LPG gas sensor. Herein, the annealing temperature was used as a tool to regulate the morphology of nanoparticles from non-uniform elongated solid nanoparticles to donut-shaped structures. The structural variations as a function of annealing temperature characterized using high energy synchrotron X-Ray Diffraction and selected area electron diffraction determines preferential orientation of nanoparticles along (104) plane. Owing to its large surface area and porosity, the sensor with donut-shaped morphology exhibited outstanding response enabling efficient detection of LPG gas with concentration as low as 10 ppm at operating temperature 170 °C. The systematic gas sensing experiments performed periodically also demonstrates fast response/recovery, high stability and excellent repeatability towards LPG gas. In addition, the possible sensing mechanism of α-Fe2O3 nanoparticles based gas sensor towards the LPG gas has been discussed.
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