Methane sensors based on ZnGa2O4 ceramics with addition of Er for combustion monitoring systems
Almaev А.V. Karipbayev Z.T. Zhurkin E.B. Yakovlev N.N. Kukenov O.I. Korchemagin A.O. Akmetova-Abdik G.A. Kumarbekov K.K. Zhunusbekov A.M. Mochalov L.A. Slapovskaya E.A. Popov A.I.
May 2025Elsevier B.V.
Optical Materials: X
2025#26
Ceramic pellets of pure ZnGa2O4 and ZnGa2O4 with Er-addition are synthesized and their structural and gas-sensitive properties are investigated. The addition of Er leads to the formation of a second Er3Ga5O12 phase in the ZnGa2O4 matrix and a larger active surface which allows an 11.1-fold increase in the response of ZnGa2O4 to 104 ppm of CH4. At the maximum response temperature corresponding to 650 °C, the responses to 100 and 104 ppm of CH4 for ZnGa2O4 with Er addition were 2.91 a.u. and 20.74 a.u., respectively. ZnGa2O4 with Er addition is characterized by a wide dynamic range of CH4 concentrations, from 100 ppm to 20000 ppm, weak dependence of gas-sensitive characteristics on humidity in the relative humidity range of 30–70 %, weak changes of gas-sensitive characteristics under cyclic gas exposure. The samples also demonstrate high responses to NO2 and H2, which at a gas concentration of 100 ppm and a temperature of 650 °C are 3.37 a.u. and 4.77 a.u., respectively. A plausible mechanism of the sensing effect of ZnGa2O4 with Er addition is proposed and prospects for the development of high-temperature CH4 sensors based on the studied samples for combustion monitoring systems and determination of the ideal fuel/air mixture are discussed.
Ceramics , Methane sensors , Rare-earth doping , ZnGa2O4
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Laboratory of Metal Oxide Semiconductors, Research and Development Center for Advanced Technologies in Microelectronics, National Research Tomsk State University, Tomsk, 634050, Russian Federation
Fokon LLC, Kaluga, 248035, Russian Federation
Institute of Physical and Technical Sciences, L.N. Gumilyov Eurasian National University, Astana, 010008, Kazakhstan
N. I. Lobachevsky State University, Nizhny Novgorod, 603950, Russian Federation
The University of North Carolina at Charlotte, Charlotte, 28223, United States
Institute of Solid State Physics, University of Latvia, 8 Kengaraga, Riga, LV-1063, Latvia
Laboratory of Metal Oxide Semiconductors
Fokon LLC
Institute of Physical and Technical Sciences
N. I. Lobachevsky State University
The University of North Carolina at Charlotte
Institute of Solid State Physics
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