The effects of the particle size and crystallite size on the response time for resistive oxygen gas sensor using cerium oxide thick film

ABSTRACTCerium oxide nanosized powder was synthesized by modified precipitation method. The precipitate, which was formed from the addition of NH4OH to Ce(NO3)3 aqueous solution, and was filtered. The obtained gel was mixed with carbon powder with a particle size of about 20 nm by a mechanically rotating mixer. The mixture was dried at 343 K in air. The carbon powder was burned out by heat treatment at 1173 K in air for 4 h, resulting in the formation of CeO2 powder with a size of 50 nm. A thick film was formed on an alumina substrate by screen printing, and was fired at 1373 K. The thick film had porous structure and the grain size was about 120 nm. The resistance of the thick film was almost proportional to P (O2)1/6, where P (O2) is oxygen partial pressure, in the P (O2) range from 10−13 to 105 Pa at 1073 and 1173 K. The response time (t90) was 23 and 7 ms at 1023 K when P(O2) changed from 65 to 25 kPa and 25 to 65 kPa, respectively. The reason for this result was explained on the basis of surface reaction of cerium oxide grain.

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20-nm-Nanogap Oxygen Gas Sensor with Solution-Processed Cerium Oxide

Sensors and Actuators B Chemical ◽

10.1016/j.snb.2021.130098 ◽

2021 ◽

pp. 130098

Author(s):

Trong Tue Phan ◽

Tsubasa Tosa ◽

Yutaka Majima

Keyword(s):

Gas Sensor ◽

Cerium Oxide ◽

Solution Processed ◽

Oxygen Gas ◽

20 Nm

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B7.4 - YSZ Thick Film Oxygen Gas Sensor Using the Direct Ionic Thermoelectric Effect

10.5162/sensor09/v2/b7.4 ◽

2009 ◽

Author(s):

Ulla Roeder-Roith ◽

Frank Rettig ◽

Kathy Sahner ◽

Ralf Moos ◽

Timo Roeder ◽

...

Keyword(s):

Thick Film ◽

Gas Sensor ◽

Thermoelectric Effect ◽

Oxygen Gas

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A low temperature nano-structured SrTiO3 thick film oxygen gas sensor

Ceramics International ◽

10.1016/j.ceramint.2003.12.068 ◽

2004 ◽

Vol 30 (7) ◽

pp. 1819-1822 ◽

Cited By ~ 32

Author(s):

Y. Hu ◽

O.K. Tan ◽

W. Cao ◽

W. Zhu

Keyword(s):

Low Temperature ◽

Thick Film ◽

Gas Sensor ◽

Oxygen Gas

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Pd Dopant for SnO2 Based Thick Film Gas Sensor for Detection of LPG using ANN Technique

SSRN Electronic Journal ◽

10.2139/ssrn.3515140 ◽

2020 ◽

Author(s):

Amit Gupta ◽

Santharaman Kannan ◽

G. F. Harish Reddy

Keyword(s):

Thick Film ◽

Gas Sensor

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Ammonia Gas Sensing Characteristic of P3HT-rGO-MWCNT Composite Films

Applied Sciences ◽

10.3390/app11156675 ◽

2021 ◽

Vol 11 (15) ◽

pp. 6675

Author(s):

Tran Si Trong Khanh ◽

Tran Quang Trung ◽

Le Thuy Thanh Giang ◽

Tran Quang Nguyen ◽

Nguyen Dinh Lam ◽

...

Keyword(s):

Response Time ◽

Gas Sensor ◽

Gas Sensing ◽

Composite Films ◽

Weight Ratio ◽

Film Surface ◽

Relative Sensitivity ◽

Ammonia Gas ◽

Casting Technique ◽

Multi Walled Carbon Nanotubes

In this work, the P3HT:rGO:MWCNTs (PGC) nanocomposite film applied to the ammonia gas sensor was successfully fabricated by a drop-casting technique. The results demonstrated that the optimum weight ratio of the PGC nanocomposite gas sensor is 20%:60%:20% as the weight ratio of P3HT:rGO:MWCNTs (called PGC-60). This weight ratio leads to the formation of nanostructured composites, causing the efficient adsorption/desorption of ammonia gas in/out of the film surface. The sensor based on PGC-60 possessed a response time of 30 s, sensitivity up to 3.6% at ammonia gas concentration of 10 ppm, and relative sensitivity of 0.031%/ppm. These results could be attributed to excellent electron transportation of rGO, the main adsorption activator to NH3 gas of P3HT, and holes move from P3HT to the cathodes, which works as charge “nano-bridges” carriers of Multi-Walled Carbon Nanotubes (MWCNTs). In general, these three components of PGC sensors have significantly contributed to the improvement of both the sensitivity and response time in the NH3 gas sensor.

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Localized Collection of Airborne Analytes: A Transport Driven Approach to Improve the Response Time of Existing Gas Sensor Designs including SERS based Detection of Small Molecules

MRS Proceedings ◽

10.1557/opl.2015.398 ◽

2015 ◽

Vol 1746 ◽

Author(s):

Jun Fang ◽

Se-Chul Park ◽

Leslie Schlag ◽

Thomas Stauden ◽

Joerg Pezoldt ◽

...

Keyword(s):

Response Time ◽

Small Molecules ◽

Gas Sensor ◽

Recent Trend ◽

Active Area ◽

Analyte Concentration ◽

Analyte Molecule ◽

Collection Rate ◽

Molecular Binding ◽

Increased Sensitivity

ABSTRACTThe detection of single molecular binding events has been a recent trend in sensor research introducing various sensor designs where the active sensing elements are nanoscopic in size. Currently, diffusion-only-transport is often used and it becomes increasingly unlikely for an analyte molecule to “find” and interact with sensing structures where the active area is shrunk in size, trading an increased sensitivity with a long response time. This report introduces electrodynamic nanolens based analyte concentration concepts to transport airborne analytes to nanoscopic sensing points to improve the response time of existing gas sensor designs. In all cases we find that the collection rate is several orders of magnitudes higher than in the case where the collection is driven by diffusion.

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