期刊
SENSORS AND ACTUATORS A-PHYSICAL
卷 169, 期 2, 页码 288-294出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.sna.2011.01.016
关键词
Ag/AgCl; Chloride sensor; Thick-film sensor; Soil salt measurement
资金
- Engineering and Physical Sciences Research Council [EP/F004362/1] Funding Source: researchfish
- EPSRC [EP/F004362/1] Funding Source: UKRI
Silver-silver chloride electrodes (Ag/AgCl) for the detection of chloride ions were fabricated using thick-film technology. Five different formulations were prepared and chloride responses were investigated over time. Almost identical and near Nernstian responses were observed over the first 162 days with an average chloride sensitivity for all formulations of -51.12 +/- 0.45 mV per decade change in chloride concentration compared with a value of -50.59 +/- 0.01 mV over 388 days for the best two formulations. After 6-months continuous immersion in tap water, pastes formulated with a glass binder began to exhibit a loss in sensitivity whilst those formulated from a commercial thick-film dielectric paste remained functional for the best part of a year. This difference in lifetime performance is attributed to the inclusion of proprietary additives in the commercial paste aiding adhesion and minimising AgCl leaching. The mechanical and chemical robustness of these electrodes has been demonstrated through their ability to detect changing levels of chloride when immersed in soil columns. This particular capacity will make them an invaluable tool in the fields of hydrology, agricultural science, soil science and environmental science. (C) 2011 Elsevier B.V. All rights reserved.
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