Synthesis and gas sensing properties of SnO2 nanoparticles with different morphologies
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The SnO2 particles with different morphologies of nanorod, nanosheet, nanoparticle and nanodot were synthesized by liquid-phase methods. In addition, Pt was loaded on each prepared SnO2 by dispersing SnO2 particles into PtCl4 2− aqueous solutions containing 0.67 vol% methanol, followed by UV light irradiation for 6 h. The products were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and Brunauer–Emmett–Teller measurement. The gas sensing properties of the synthesized SnO2 were tested by detecting the change in electric resistivity in flowing aceton and methanol gases with nitrogen base. The gas sensing properties greatly changed depending on not only the specific surface area, but also the exposed crystal plane, i.e., the SnO2 nanorods exposing (111) planes showed the excellent sensitivity and quick response ability, indicating the excellent gas sensing ability of the (111) plane. Furthermore, the Pt loading exceedingly enhanced the gas sensing properties.
KeywordsSemiconductors Microstructure Inorganic compounds Chemical synthesis Surface properties
This research was partly supported by the Network Joint Research Center for Materials and Devices, the Grant-in-Aid for Science Research (23241025, No. 25289245), the Nippon Sheet Glass Foundation for Materials Science and Engineering, the Hosokawa Powder Technology Foundation.