Premium
Investigation of Electrochemical Properties of La 2 O 3 –RuO 2 Thin‐Film Sensing Electrodes Used in Sensors for the Analysis of Complex Solutions
Author(s) -
Zhuiykov Serge,
Marney Donavan,
Kats Eugene
Publication year - 2011
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2010.02562.x
Subject(s) - materials science , electromotive force , x ray photoelectron spectroscopy , ruthenium oxide , electrode , oxide , lanthanum , screen printing , lanthanum oxide , analytical chemistry (journal) , thin film , selectivity , electrochemistry , doping , nanotechnology , chemical engineering , inorganic chemistry , optoelectronics , composite material , catalysis , chemistry , metallurgy , biochemistry , physics , quantum mechanics , chromatography , engineering
Lanthanum oxide (La 2 O 3 )‐doped ruthenium oxide (RuO 2 ) thin‐film sensing electrodes (SEs) have been prepared by screen‐printing for the development of integrated ceramic water quality sensors. Their chemical and structural modifications were investigated by X‐ray diffraction (XRD), scanning electrode microscopy, X‐ray photoelectron microscopy (XPS), and energy‐dispersive X‐ray analysis (EDX) techniques. The La 2 O 3 –RuO 2 SE applied onto an alumina sensor substrate has displayed a linear response to dissolved oxygen in water from 0.5 to 8.0 ppm within a temperature range of 9–35°C. A Nernstian slope of −49.3 mV per decade at 7.48 pH was observed. Selectivity measurements revealed that the presence of Ca 2+ , Mg 2+ , Li + , Br − , NO 3− , PO 4 3− , and Cl − ions has no significant effect on the sensor's electromotive‐force ( emf ) response. This sensor overcomes the poor selectivity problem commonly observed in semiconductor‐based water sensors. This work has also shown that these water sensors based on La 2 O 3 –RuO 2 SE have potential utilization in instruments for the simultaneous qualitative analysis of complex liquid media based on the principles of an “electronic tongue” device.