Oxygen sensing characteristics of limiting current-type sensors with microstructural and structural variations in diffusion barrier

Lee, Jong Heun; Kim, Hoin; Kim, Byung Ki

doi:10.1016/0167-577x(95)00202-2

Cited by 11 publications

(1 citation statement)

References 5 publications

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“…Knudsen diffusion is anticipated where the pore size of the diffusion barrier is significantly less than the mean free path of the gas (around 0.1 μm at 25 • C, but increasing as a result of expansion of the gas by a factor of 4 at the typical sensor operating temperature). Lee et al (1996) contend that Knudsen diffusion occurs when the pore diameter is less than 0.01 μm. Examination of the micrographs (figures 1-7) indicates that spaces through which diffusion occurs have dimensions of around 0.1 μm.…”

Section: Current-voltage Characteristicsmentioning

confidence: 99%

Thick-film amperometric zirconia oxygen sensors: influence of cobalt oxide as a sintering aid

Maskell

Brett

Brandon

2014

Meas. Sci. Technol.

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Amperometric thick-film zirconia oxygen sensors are electrochemical devices in which the zirconia thick-film acts as both electrolyte and diffusion barrier. Their preparation involves temperatures of 1300–1400 °C to sinter the thick-film and reduce the through-porosity to a sufficiently low value to restrict oxygen diffusion rates and hence sensor limiting currents. The resulting sensors normally require an operating temperature of 800 °C to enable operation in the percentage oxygen concentration range. In this work sensors were prepared with and without doping with cobalt oxide. Thick-films were characterized using scanning electron microscopy to view a fracture edge and by plotting current–voltage curves of the prepared sensors operated at 600–800 °C in oxygen concentrations up to 21% at atmospheric pressure. It was found that doping with cobalt oxide markedly increased the sintering rate and enabled a reduction of 100–110 °C in sintering temperature for a given final through-porosity. As a result it was possible to operate doped sensors at a temperature around 200 °C lower than otherwise identically-prepared undoped sensors. This is expected to have a beneficial effect on sensor life and reduce operating power.

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Section: Current-voltage Characteristicsmentioning

confidence: 99%

Thick-film amperometric zirconia oxygen sensors: influence of cobalt oxide as a sintering aid

Maskell

Brett

Brandon

2014

Meas. Sci. Technol.

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Electronic Noses: From Advanced Materials to Sensors Aided with Data Processing

Wan

Jian

et al. 2018

Adv Materials Technologies

266

186

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Artificial olfaction, i.e., e‐nose, plays a critical function in robotics by mimicking the human olfactory organ that can recognize different smells that correlate with a range of fields, including environment monitoring, disease diagnosis, public security affairs, agricultural production, food industry, etc. The advances in the artificial olfaction (electronic nose) technology and its applications are concisely reviewed herein. Three main elements are investigated and presented, with an emphasis on the emerging sensors and algorithm of the artificial neural network in the relevant fields. The first element is the diverse applications of e‐nose in medical care, food industry, environment monitoring, public security affairs, and agricultural production. The second element is the investigation of the sensors in e‐nose and representative and promising advances, which is the building block of e‐nose through mimicking the olfactory receptors. The third element is the introduction to the algorithm of the artificial neural network to serve in the recognition of the pattern of odors (i.e., their chemical profiles). Promises and challenges of the separately reviewed parts and the combined parts are presented and discussed. Ideas regarding further orientation and development of the e‐nose system are also considered.

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Ultrahigh temperature platinum microheater encapsulated by reduced-TiO2 barrier layer

Akasaka

Boku

Amamoto

et al. 2019

Sensors and Actuators A: Physical

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Oxygen sensing characteristics of limiting current-type sensors with microstructural and structural variations in diffusion barrier

Cited by 11 publications

References 5 publications

Thick-film amperometric zirconia oxygen sensors: influence of cobalt oxide as a sintering aid

Thick-film amperometric zirconia oxygen sensors: influence of cobalt oxide as a sintering aid

Electronic Noses: From Advanced Materials to Sensors Aided with Data Processing

Ultrahigh temperature platinum microheater encapsulated by reduced-TiO2 barrier layer

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