Enhanced gas-sensing behaviour of Ru-doped SnO2 surface: A periodic density functional approach

Zhigang Zhu, Ramesh C. Deka, Arunabhiram Chutia, Riadh Sahnoun, Hideyuki Tsuboi, Michihisa Koyama, Nozomu Hatakeyama, Akira Endou, Hiromitsu Takaba, Carlos A. Del Carpio, Momoji Kubo, Akira Miyamoto

    Research output: Contribution to journalArticlepeer-review

    49 Citations (Scopus)

    Abstract

    A theoretical study on Ru-doped rutile SnO2(1 1 0) surface has been carried out by means of periodic density functional theory (DFT) at generalized gradient approximation (GGA-RPBE) level with a periodic supercell approach. Electronic structure analysis was performed based on the band structure and partial density of states. The results provide evidence that the electronic structures of SnO2(1 1 0) surface are modified by the surface Ru dopant, in which Ru 4d orbital are located at the edge of the band gap region. It is demonstrated that molecular oxygen adsorption characteristics on stoichiometric SnO2(1 1 0) surface are changed from endothermic to exothermic due to the existence of surface Ru dopant. The dissociative adsorption of molecular oxygen on the Ru5c/SnO2(1 1 0) surface is exothermic, which indicates that Ru could act as an active site to increase the oxygen atom species on SnO2(1 1 0) surface. Our present study reveals that the Ru dopant on surface is playing both electronic and chemical role in promoting the SnO2 gas-sensing property.

    Original languageEnglish
    Pages (from-to)1248-1255
    Number of pages8
    JournalJournal of Physics and Chemistry of Solids
    Volume70
    Issue number9
    DOIs
    Publication statusPublished - Sept 2009

    All Science Journal Classification (ASJC) codes

    • General Chemistry
    • Condensed Matter Physics
    • General Materials Science

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