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Synthesis and characterization of InNbO₄ nanopowder for gas sensors
C Balamurugan1, E Vijayakumar, A Subramania
1Department of Industrial Chemistry, Alagappa University, Karaikudi-630 003, India.
Talanta
|January 24, 2012
Summary
Indium niobate nanopowder was synthesized at low temperatures. This material exhibits promising gas sensing capabilities for liquid petroleum gas and ammonia.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Engineering
Background:
- Development of novel semiconductor materials for gas sensing applications is crucial.
- Indium niobate (InNbO4) is a material with potential for various electronic and sensing applications.
Purpose of the Study:
- To synthesize indium niobate (InNbO4) nanopowder using a low-temperature citrate complex process.
- To characterize the structural, optical, and electrical properties of the synthesized InNbO4.
- To investigate the gas sensing performance of InNbO4 for various gases.
Main Methods:
- Low-temperature synthesis via niobium citrate complex process.
- Characterization using thermal analysis, XRD, SEM, TEM, EDS, DRS, and impedance spectroscopy.
- Gas sensing measurements for LPG, NH3, and ethanol at optimized operating temperatures.
Main Results:
- Well-crystalline monoclinic InNbO4 nanopowder obtained at 600°C with an average particle size of 22nm.
- Optical band gap determined to be 2.66eV.
- Temperature-dependent conductivity followed Arrhenius relation with an activation energy of 0.43eV.
- Demonstrated gas sensing sensitivity to LPG (0.97) and NH3 (0.70) higher than ethanol (0.46).
Conclusions:
- The low-temperature synthesis route is effective for producing InNbO4 nanopowder.
- InNbO4 exhibits suitable properties for gas sensing applications, particularly for LPG and NH3.
- Further studies on sensor response and recovery dynamics are warranted.
