Nanostructured TiO2-based mixed metal oxides prepared using microemulsions for carbon monoxide detection |
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Authors: | Theera Anukunprasert Chintana Saiwan Elisabetta Di Bartolomeo Enrico Traversa |
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Affiliation: | (1) The Petroleum and Petrochemical College, Chulalongkorn University, 254 Phyathai Road Patumwan, 10330 Bangkok, Thailand;(2) Department of Chemical Science and Technology, University of Rome Tor Vergata, Via della Ricerca Scientifica 1, 00133 Rome, Italy |
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Abstract: | Nanostructured powders of Nb-doped TiO2 (TN) and SnO2 mixed with Nb-doped TiO2 in two different atomic ratios—10 to 1 (TSN 101) and 1 to 1 (TSN 11)—were synthesized using the reverse micelle microemulsion
of a nonionic surfactant (brine solution/1-hexanol/Triton X-100/cyclohexane). The powders were characterized by transmission
electron microscopy (TEM) and X-ray diffraction (XRD). Thick films were fabricated for gas sensors and characterized by XRD
analysis and field emission scanning electron microscopy (FE-SEM). The effects of the film morphology and firing temperature
in the range 650–850 °C on CO sensitivity were studied. The best gas response, expressed as the ratio between the resistance
in air and the resistance under gas exposure (R
air/R
gas), was measured for TSN 11 at 11 for 1,000 ppm CO exposure. All types of sensors showed good thermal stability. The electrochemical
impedance spectroscopy (EIS) measurements were performed in different gas atmospheres (air, O2, CO and NO2) to better understand the electrical properties of the nanostructured mixed metal oxides. |
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Keywords: | Nanostructured mixed metal oxides Microemulsions Carbon monoxide Gas sensor |
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