Journal
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
Volume 215, Issue 20, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssa.201701015
Keywords
cobalt oxide; ethanol; gas sensors; ruthenium; sensing films
Funding
- National Research Council of Thailand (NRCT)
- Program in Nanoscience and Nanotechnology, Faculty of Science, Maejo University, Thailand
- Program in Applied Physics, Faculty of Science, Maejo University, Thailand
- National Research University Project under Thailand's Office of the Higher Education Commission
- Graduate School, Faculty of Science, Chiang Mai University, Thailand
- Department of Chemistry, Faculty of Science, Chiang Mai University, Thailand
- National Electronics and Computer Technology Center, Pathum Thani, Thailand
- National Science and Technology Development Agency (NSTDA) Pathum Thani, Thailand
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Co3O4 nanoparticles (NPs) and Co3O4 NPs-functionalized with 0.25, 0.50, and 1.00wt.% Ruthenium (Ru) are synthesized by the precipitation and impregnation methods. X-ray diffraction data confirm that all samples are highly crystalline with a typical cubic Co3O4 NPs structure. Electron microscopic images show spherical morphologies of Co3O4 nanoparticles with the diameters of 10-30nm and Ru nanoparticles with relatively small diameters of 2-4nm loaded on Co3O4 surfaces. The gas-sensing results reveal that Ru loading at an optimally low Ru content of 0.25wt.% led to significantly enhanced ethanol sensing performances. Specifically, the 0.25 wt.%Ru/Co3O4 sensor exhibits a good p-type response of approximate to 30 to 100ppm C2H5OH, short response time (0.08s), good recovery time (a few minutes) and high C2H5OH selectivity against H2S, H-2, NH3, NO2, and SO2. Therefore, the Ru-loaded Co3O4 sensor is a promising alternative p-type gas sensor for ethanol detection.
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