02357nas a2200241   4500008004100000022001400041245010200055210006900157260006900226300001200295490000800307520148900315653002301804653003001827653002001857653003301877653000801910100001901918700002001937700001801957700001801975856012201993       2014                        eng d  a0925-400500aHumidity-sensing studies of cerium oxide nanoparticles synthesizedby non-isothermal precipitation0 aHumiditysensing studies of cerium oxide nanoparticles synthesize  aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcNOV  a229-2380 v2033 a<p>We report the fabrication of a highly sensitive and fast humidity sensor based on cerium oxide (CeO2) nanoparticles, which were prepared at low cost via a simple non-isothermal precipitation method. The asprepared CeO2 nanoparticles were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy( TEM) and the results indicated the formation of face centered cubic phase of CeO2 with average crystallite size of approximately 10-12 nm. Humidity sensors based on CeO2 nanoparticles exhibit high and linear response within the whole relative humidity (RH) range of 11-97% at an operating frequency of 60 Hz. The corresponding impedance changes by approximately three orders of magnitude within the entire humidity range from 11% to 97% RH. The response and recovery times are about 2-3 and 9-10 s, respectively, when RH was switched between 11% and 97%. Furthermore, the sensors also show relatively small hysteresis, excellent reproducibility, long term stability and broad range of operation (11-97% RH). The complex impedance spectra of the sensor at different RHs and the equivalent circuit were analyzed to explore the humidity-sensing mechanism. This study demonstrates that the CeO2 nanoparticles prepared by non-precipitation method can be used as the humidity-sensing material for the fabrication of humidity sensors. (C) 2014 Elsevier B. V. All rights reserved.</p>10aCeO2 nanoparticles10aComplex impedance spectra10ahumidity sensor10aNon-isothermal precipitation10aTEM1 aKhadse, V., R.1 aThakur, Sharada1 aPatil, K., R.1 aPatil, Pradip  uhttps://library.ncl.res.in/content/humidity-sensing-studies-cerium-oxide-nanoparticles-synthesizedby-non-isothermal-0