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Effect of Additives of Pt, Pd, Ag, and Y in Thin Nanocrystalline SnO2 Films on the Characteristics of Resistive Hydrogen Sensors

  • PHYSICS OF SEMICONDUCTORS AND DIELECTRICS
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Russian Physics Journal Aims and scope

The results of studying electrical and gas sensitive characteristics of H2 sensors based on thin nanocrystalline SnO2 films with the Pt, Pd, and Ag dispersed layers deposited on the surface and Ag, Y, and Ag + Y additives in the volume are presented. It is shown that various combinations of catalysts on the surface and in the volume have a significant effect on the microstructure of films and density of oxygen adsorption sites on the surface of tin dioxide. As a result, the resistance values of sensors in clean air R0, activation energies of the temperature dependences of R0, responses to hydrogen in the concentration range of 50–2000 ppm are different. Studies performed by the method of UV-visible spectroscopy revealed in the absorption spectra of films with a silver addition in the volume a band of surface plasmon resonance of silver indicating that the additive is present in the form of metallic Ag nanoparticles. Particular attention was paid to the influence of long-term tests on the properties of sensors with the listed additives. It was established that the joint introduction of Ag+Y into the volume of films prevents the increase of the resistance and responses during prolonged exposure to hydrogen, which is observed during the operation of all other samples studied. Possible mechanisms for changing the sensors’ properties during testing and the role of additives in their stabilization are considered.

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Authors and Affiliations

  1. V. D. Kuznetsov Siberian Physical-Technical Institute at Tomsk State University, Tomsk, Russia

    E. Yu. Sevast’yanov, N. K. Maksimova, A. I. Potekaev, E. V. Chernikov & N. V. Sergeichenko

  2. National Research Tomsk State University, Tomsk, Russia

    A. I. Potekaev, A. V. Almaev & S. V. Kim

Authors
  1. E. Yu. Sevast’yanov
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  2. N. K. Maksimova
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  3. A. I. Potekaev
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  4. A. V. Almaev
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  5. E. V. Chernikov
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  6. N. V. Sergeichenko
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  7. S. V. Kim
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Correspondence to E. Yu. Sevast’yanov.

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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 5, pp. 155–163, May, 2018.

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Sevast’yanov, E.Y., Maksimova, N.K., Potekaev, A.I. et al. Effect of Additives of Pt, Pd, Ag, and Y in Thin Nanocrystalline SnO2 Films on the Characteristics of Resistive Hydrogen Sensors. Russ Phys J 61, 979–988 (2018). https://doi.org/10.1007/s11182-018-1486-3

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  • DOI: https://doi.org/10.1007/s11182-018-1486-3

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