Phase composition,conductivity,and sensor properties of cerium-doped indium oxide

作     者：M.I.Ikim G.N.Gerasimov V.F.Gromov O.J.Ilegbusi L.I.Trakhtenberg M.I.Ikim;G.N.Gerasimov;V.F.Gromov;O.J.Ilegbusi;L.I.Trakhtenberg

作者机构：N.N.Semenov Federal Research Center for Chemical Physics of RASMoscowRussia University of Central FloridaOrlandoFLUSA Moscow Institute of Physics and Technology(State University)DolgoprudnyMoscow RegionRussia Lomonosov Moscow State UniversityMoscowRussia 

出 版 物：《Nano Materials Science》 (纳米材料科学（英文版）)

年 卷 期：2024年第6卷第2期

页      面：193-200页

核心收录：

学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 080202[工学-机械电子工程] 0703[理学-化学] 0802[工学-机械工程] 

基　　金：supported by the Russian Science Foundation(grant No.22-19-00037) https://rscf.ru/project/22-19-00037/ 

主　　题：Cerium oxide Indium oxide Nanocomposite Hydrothermal method Cubic phase Rhombohedral phase Sensor response Conductivity Hydrogen Response/recovery time 

摘      要：The hydrothermal synthesis of In_(2)O_(3)and CeO_(2)–In_(2)O_(3)is investigated as well as the properties of sensor layers based on these *** the synthesis of In_(2)O_(3),intermediate products In(OH)_(3)and InOOH are formed,which are the precursors of stable cubic(c-In_(2)O_(3))and metastable rhombohedral(rh-In_(2)O_(3))phases,respectively.A transition from c-In_(2)O_(3)to rh-In_(2)O_(3)is observed with the addition of CeO_(2).The introduction of cerium into rh-In_(2)O_(3)results in a decrease in the sensor response to hydrogen,while it increases in composites based on c-In_(2)O_(3).The data on the sensor activity of the composites correlate with XPS results in which CeO_(2)causes a decrease in the concentrations of chemisorbed oxygen and oxygen vacancies in rh-In_(2)O_(3).The reverse situation is observed in composites based on c-In_(2)O_(3).Compared to In_(2)O_(3)and CeO_(2)–In_(2)O_(3)obtained by other methods,the synthesized composites demonstrate maximum response to H_(2)at low temperatures by 70–100℃,and have short response time(0.2–0.5 s),short recovery time(6–7 s),and long-term stability.A model is proposed for the dependence of sensitivity on the direction of electron transfer between In_(2)O_(3)and CeO_(2).