Magnesium ferrite nanoparticles: a rapid gas sensor for alcohol
| Autor: | Pratibha Rao, R.V. Godbole, Sunita Bhagwat |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Polymers and Plastics Metal ions in aqueous solution Inorganic chemistry Nanoparticle Sintering 02 engineering and technology engineering.material 010402 general chemistry 01 natural sciences Biomaterials chemistry.chemical_compound Adsorption Specific surface area Ethanol Spinel technology industry and agriculture Metals and Alloys equipment and supplies 021001 nanoscience & nanotechnology 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry engineering Methanol 0210 nano-technology |
| Zdroj: | Materials Research Express. 4:025032 |
| ISSN: | 2053-1591 |
| Popis: | Highly porous spinel MgFe2O4 nanoparticles with a high specific surface area have been successfully synthesized by a sintering free auto-combustion technique and characterized for their structural and surface morphological properties using XRD, BET, TEM and SEM techniques. Their sensing properties to alcohol vapors viz. ethanol and methanol were investigated. The site occupation of metal ions was investigated by VSM. The as-synthesized sample shows the formation of sponge-like porous material which is necessary for gas adsorption. The gas sensing characteristics were obtained by measuring the gas response as a function of operating temperature, concentration of the gas, and the response-recovery time. The response of magnesium ferrite to ethanol and methanol vapors was compared and it was revealed that magnesium ferrite is more sensitive and selective to ethanol vapor. The sensor operates at a substantially low vapor concentration of about 1 ppm of alcohol vapors, exhibits fantastic response reproducibility, long term reliability and a very fast response and recovery property. Thus the present study explored the possibility of making rapidly responding alcohol vapor sensor based on magnesium ferrite. The sensing mechanism has been discussed in co-relation with magnetic and morphological properties. The role of occupancy of Mg2+ ions in magnesium ferrite on its gas sensing properties has also been studied and is found to influence the response of magnesium ferrite ethanol sensor. |
| Databáze: | OpenAIRE |
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