Gas sensing performance of GaOOH and β-Ga2O3 synthesized by hydrothermal method: a comparison
Gallium Oxy Hydrate (GaOOH) and β-Ga2O3 nanostructures in submicron scale have been synthesized at low temperature by surfactant-free hydro-thermal method. First, GaOOH has been synthesized using Gallium nitrate anhydrate, Ammonium hydroxide as precursors and double distilled water as solvent. As ob...
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Published in | Materials research express Vol. 6; no. 2 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
IOP Publishing
01.02.2019
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Subjects | |
Online Access | Get full text |
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Summary: | Gallium Oxy Hydrate (GaOOH) and β-Ga2O3 nanostructures in submicron scale have been synthesized at low temperature by surfactant-free hydro-thermal method. First, GaOOH has been synthesized using Gallium nitrate anhydrate, Ammonium hydroxide as precursors and double distilled water as solvent. As obtained GaOOH powders have been converted into -Gallium Oxide ( -Ga2O3) and β-Gallium Oxide (β-Ga2O3) powders by calcination at 400 °C and 900 °C, respectively. The GaOOH and β-Ga2O3 powders have been characterized by XRD, FE-SEM, UV-VIS, Thermo Gravimetric Analysis, I-V characteristics and BET surface analysis in order to reveal their structural, morphological, optical, thermal, electrical and surface properties. FE-SEM micrographs confirm the rod like and needle like morphologies of GaOOH and β- Ga2O3 samples, respectively. Porous nature of the samples observed through BET and BJH analyses. Synthesized GaOOH and β-Ga2O3 powders have been subjected to room temperature CO2 gas sensing in the range, 2000 ppm - 10 000 ppm. β-Ga2O3 showed enhanced CO2 sensing response than that of GaOOH due to its better structural, electrical, morphological and surface properties. GaOOH showed quick response of 80 s and fast recovery of 129 s at 8000 ppm while β-Ga2O3 showed quick response of 52 s at 8000 ppm and faster recovery of 98 s at 4000 ppm. Also, the repeatability studies were done for GaOOH and β-Ga2O3 films by exposing to different CO2 concentrations for a period of 6 consecutive days. |
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Bibliography: | MRX-110133.R1 |
ISSN: | 2053-1591 |
DOI: | 10.1088/2053-1591/aaede8 |