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Aero-gel based CeO2 nanoparticles: synthesis, structural properties and detailed humidity sensing response

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Abstract

In this work, we present aero-gel based cerium oxide (CeO2) nanoparticles for the relative humidity (%RH) sensing application. X-ray diffraction (XRD) and N2 adsorption–desorption isotherms revealed that the synthesized CeO2 nanoparticles (NPs) possessed a face centered cubic (fcc) structure with a high surface area (268 m2 g−1). The high resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM), and selected area electron diffraction (SAED) studies confirmed that the shape of CeO2 NPs was spherical and they possessed a polycrystalline nature. X-ray photoelectron spectroscopy (XPS) studies revealed the presence of both trivalent (Ce3+) and tetravalent (Ce4+) oxidation states of ceria. The CeO2 NPs’ response towards %RH was explored by measuring the important sensing attributes (response/recovery, linearity, hysteresis, repeatability and stability) at 11–98%RH and at room temperature. An impressive impedance change of 4.5 orders of magnitude was observed along with a swift response (4.6 s) time and rapid recovery (2.7 s) time. Moreover, the prepared sensor showed negligible hysteresis, excellent stability and good reversible response in the complete 11–98%RH range.

Graphical abstract: Aero-gel based CeO2 nanoparticles: synthesis, structural properties and detailed humidity sensing response

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Publication details

The article was received on 25 Feb 2019, accepted on 31 Mar 2019 and first published on 01 Apr 2019


Article type: Paper
DOI: 10.1039/C9TC01081E
Citation: J. Mater. Chem. C, 2019, Advance Article

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    Aero-gel based CeO2 nanoparticles: synthesis, structural properties and detailed humidity sensing response

    E. Poonia, P. K. Mishra, V. Kiran, J. Sangwan, R. Kumar, P. K. Rai, R. Malik, V. K. Tomer, R. Ahuja and Y. K. Mishra, J. Mater. Chem. C, 2019, Advance Article , DOI: 10.1039/C9TC01081E

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