Abstract
Hafnium oxide nanocrystalline powders were synthesized by a low cost sol-gel technique using hafnium tetrachloride as the main precursor. The crystal structures and the particle sizes were investigated by X-ray diffraction (XRD) and Transmission Electron Microscopy (TEM). The morphologies of the powders were studied by Field Emission Scanning Electron Microscopy (FESM). The powder contained crystalline HfO2 nanoparticles having sizes from 50–100 nm which were highly stable against high temperature treatment. The chemical states of the hafnium and oxygen in HfO2 were identified by X-ray photoelectron spectroscopy (XPS). Optical properties of HfO2 nanocrystals were studied by photoluminescence spectroscopy. Intense green luminescence at an energy of 2.5 eV was emitted from HfO2 nanocrystalline powder under ultraviolet excitation. The room temperature acetone gas sensing properties of HfO2 nanocrystals were evaluated by exposing HfO2 pellets to acetone gas inside a sealed glass chamber. Due to sintering at a temperature of more than 1000 °C, a nanocrystalline, porous HfO2 pellet surface evolved that exhibited an enhanced response towards a few hundreds of ppm of acetone gas in dry air.
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The authors would like to thank the Department of Physics and Central Research Facility of IIT(ISM) Dhanbad for research and characterization facilities for this work.
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The authors confirm contribution to the paper as follows: study conception and design: AC, JN; data collection: AC, JN; analysis and interpretation of results: AC, JN; draft manuscript preparation: AC, JN. All authors reviewed the results and approved the final version of the manuscript.
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Chattopadhyay, A., Nayak, J. High temperature sintering induced acetone gas sensing properties of sol-gel synthesized HfO2 nanocrystals. J Sol-Gel Sci Technol 103, 791–798 (2022). https://doi.org/10.1007/s10971-022-05900-2
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DOI: https://doi.org/10.1007/s10971-022-05900-2