Effect of ZnO doping on morphology and electrochemical properties of sub-micron RuO<sub>2</sub> sensing electrode of DO sensor期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Effect of ZnO doping on morphology and electrochemical properties of sub-micron RuO₂ sensing electrode of DO sensor

Authors:	Serge Zhuiykov Vladimir PlashnitsaNorio Miura

Affiliation:	^a CSIRO, Materials Science and Engineering Division, 37 Graham Road, Highett, VIC. 3190, Australia ^b Research and Education Centre of Carbon Resources, Kyushu University, Kasuga-shi, Fukuoka, 816-8580, Japan ^c KASTEC, Kyushu University, Kasuga-shi, Fukuoka, 816-8580, Japan

Abstract:	Thick-film 20 mol% ZnO-doped RuO₂ sensing electrodes (SEs) were fabricated by screen-printing technique on the platinised alumina substrate of the planar electrochemical dissolved oxygen (DO) sensor. The effect of ZnO doping on morphology, electrochemical properties and sensing characteristics of the sensor was investigated. It was found that ZnO doping has not only improved the SE structure, but has also enhanced selectivity of the DO sensor. Selectivity testing exhibited that the presence of Cl⁻, Li⁺, SO₄²⁻, NO³⁻, Ca²⁺, PO₄³⁻, Mg²⁺, Na⁺ and K⁺ with a concentration range of 10⁻⁷ to 10⁻¹ mol/L in the solution had practically no effect on the sensor's emf. The reason in enhancement of the sensor characteristics could be related to the establishment of the better structured SE as more advanced crystallization is achieved for the doped RuO₂-SE.

Keywords:	ZnO RuO₂ sensing electrode DO sensor Nano-materials
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