Ultrathin CeO 2 nanosheets as bifunctional sensing materials for humidity and formaldehyde detection
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ORIGINAL ARTICLE
Ultrathin CeO2 nanosheets as bifunctional sensing materials for humidity and formaldehyde detection Peng Zhang, Le-Xi Zhang*
, Heng Xu, Yue Xing, Jing-Jing Chen, Li-Jian Bie*
Received: 29 June 2020 / Revised: 7 September 2020 / Accepted: 6 October 2020 Ó GRINM Bohan (Beijing) Publishing Co., Ltd 2020
Abstract Issues like morphology control and further multifunctional applications are of significant importance for rare earth nano-oxides, e.g., cerium dioxide (CeO2) nanostructures, however, relevant results in this respect are rather limited up to now. In the present work, ultrathin CeO2 nanosheets were synthesized through a facile lowtemperature hydrothermal method. The structure, morphology and specific surface area of these CeO2 nanosheets were characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM) and N2 adsorption–desorption. Significantly, CeO2 nanosheets have the potential as bifunctional sensing materials to detect both humidity and formaldehyde vapor. The CeO2 nanosheet humidity sensor exhibited excellent sensing characteristics in the relative humidity range of 11%–97% with the response value as high as 3.1 9 104. Meanwhile, the CeO2 nanosheet gas sensor showed superior sensitivity and repeatability with fast response/recovery speed toward
P. Zhang, L.-X. Zhang*, H. Xu, Y. Xing, J.-J. Chen, L.-J. Bie* School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China e-mail: [email protected]; [email protected] L.-J. Bie e-mail: [email protected]; [email protected] P. Zhang, L.-X. Zhang, H. Xu, Y. Xing, J.-J. Chen, L.-J. Bie Tianjin Key Laboratory for Photoelectric Materials and Devices, Tianjin 300384, China P. Zhang, L.-X. Zhang, H. Xu, Y. Xing, J.-J. Chen, L.-J. Bie Key Laboratory of Display Materials and Photoelectric Devices (Ministry of Education), Tianjin 300384, China P. Zhang, L.-X. Zhang, H. Xu, Y. Xing, J.-J. Chen, L.-J. Bie National Demonstration Center for Experimental Function Materials Education, Tianjin 300384, China
formaldehyde vapor at 300 °C. Finally, the humidity and formaldehyde sensing mechanism were discussed as well. Keywords CeO2 nanosheets; Humidity sensor; Gas sensor; Formaldehyde
1 Introduction As one of the most important rare earth oxides, cerium dioxide (CeO2) has been extensively studied over the past decades [1]. CeO2 has been used prolifically in various applications, such as photocatalysis [2], water–gas shift [3], automobile exhaust-gas treatments [4], photocatalysts [5], adsorbents [6], and potential sensing applications [7, 8]. This widespread applicability mainly originates from the outstanding properties of CeO2 [9], i.e., high oxygen storage capacity [10], quick and expedient mutation of the oxidation state between Ce4? and Ce3? [11], plentiful defects and high ionic mobility [12]. Therefore, based on the excellent performance of CeO2 itself, researchers have started in-depth research on the synthesis and morphology regulation of cerium oxides [13]. A l
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