Sensitivity Study of Nanocrystalline Fe3BO6 Sensor for Methane Gas Detection
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Date
2018
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Institute of Electrical and Electronics Engineers Inc.
Abstract
The iron borate Fe<inf>3</inf>BO<inf>6</inf> with functionalized properties in a nanostructure is an important material useful for electrodes, gas sensors, and biological probes. In this paper, we studied the X-ray diffraction pattern, field-emission electron microscopy, and methane (CH<inf>4</inf>) gas sensing properties of synthesized Fe<inf>3</inf>BO<inf>6</inf> nanocrystallites in a shape of nanoplates and nanobars from an iron borate glass 40Fe<inf>2</inf>O<inf>3</inf>-60B<inf>2</inf>O<inf>3</inf> by annealing it in microwave for 15 min at 823 and 1023 K, respectively, in air. The temperature dependent sensitivity for CH<inf>4</inf> (1000 ppm) illustrates a maximum value of 43% at an operating temperature 525 K for the 1023 K annealed sample. The sensitivity is found to be varied from 9% to 39% when the CH<inf>4</inf> gas concentration is increased from 50 to 1000 ppm. Thus, the sample has a reasonably good sensitivity for methane. Furthermore, the sensor exhibits fast response (1 min) and a good recovery time (1.6 min) as compared with other oxide materials. © 2001-2012 IEEE.
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Keywords
Annealing, Biological materials, Gas detectors, Gas sensing electrodes, Gases, Methane, Microstructure, Nanocrystals, Temperature, Temperature sensors, Field emission electron microscopies (FESEM), Gas sensing properties, Iron borate, Methane gas, Nano ceramics, Operating temperature, Sensitivity, Temperature dependent, Iron compounds
Citation
IEEE Sensors Journal, 2018, 18, 20, pp. 8230-8237