Aero-gel based CeO2 nanoparticles: synthesis, structural properties and detailed humidity sensing response. Issue 18 (17th April 2019)

• Record Type: Journal Article
• Authors: Poonia, Ekta; Mishra, Prashant Kumar; Kiran, Vijay; Sangwan, Jasbir; Kumar, Rakesh; Rai, Pramod Kumar; Malik, Ritu; Tomer, Vijay K.; Ahuja, Rajeev; Mishra, Yogendra Kumar
• Is Part Of: Journal of materials chemistry. Volume 7:Issue 18(2019)
• Page Start: 5477
• Page End: 5487
• Publication Date: 2019-04-17
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c9tc01081e
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : Mechanism of %RH sensing using aero-gel based CeO2 nanoparticles. 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 m 2 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 (Ce 3+ ) and tetravalent (Ce 4+ ) 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.