Effects of Calcination Temperature and Acid-Base Properties on Mixed Potential Ammonia Sensors Modified by Metal Oxides
| Autor: | Shiro Kakimoto, Satoshi Sugaya, Makoto Katagiri, Atsushi Satsuma, Ken-ichi Shimizu |
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| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
ammonia sensor
metal oxide YSZ acidity melting point Base (chemistry) Inorganic chemistry Electrolyte Alkalies lcsh:Chemical technology Biochemistry Article Analytical Chemistry law.invention Metal Ammonia chemistry.chemical_compound law Calcination lcsh:TP1-1185 Electrical and Electronic Engineering Instrumentation Electrodes Yttria-stabilized zirconia chemistry.chemical_classification Chemistry Temperature Oxides Electrochemical Techniques Atomic and Molecular Physics and Optics Oxygen Steam Metals visual_art Electrode Melting point visual_art.visual_art_medium Acids Bismuth |
| Zdroj: | Sensors; Volume 11; Issue 2; Pages: 2155-2165 Sensors, Vol 11, Iss 2, Pp 2155-2165 (2011) Sensors (Basel, Switzerland) |
| ISSN: | 1424-8220 |
| Popis: | Mixed potential sensors were fabriated using yttria-stabilized zirconia (YSZ) as a solid electrolyte and a mixture of Au and various metal oxides as a sensing electrode. The effects of calcination temperature ranging from 600 to 1,000 °C and acid-base properties of the metal oxides on the sensing properties were examined. The selective sensing of ammonia was achieved by modification of the sensing electrode using MoO(3), Bi(2)O(3) and V(2)O(5), while the use of WO(3,) Nb(2)O(5) and MgO was not effective. The melting points of the former group were below 820 °C, while those of the latter group were higher than 1,000 °C. Among the former group, the selective sensing of ammonia was strongly dependent on the calcination temperature, which was optimum around melting point of the corresponding metal oxides. The good spreading of the metal oxides on the electrode is suggested to be one of the important factors. In the former group, the relative response of ammonia to propene was in the order of MoO(3)Bi(2)O(3)V(2)O(5), which agreed well with the acidity of the metal oxides. The importance of the acidic properties of metal oxides for ammonia sensing was clarified. |
| Databáze: | OpenAIRE |
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