Noise in amperometric NO2 sensor

Low-cost sensor technology has been available for several years and has the potential to complement official monitoring networks. The current generation of nitrogen dioxide (NO2) sensors suffers from various technical problems. This study explores the added value of calibration models based on (multiple) linear regression including cross terms on the performance of an electrochemical NO2 sensor, the B43F manufactured by Alphasense. Sensor data were collected in duplicate at four reference sites in the Netherlands over a period of one year. It is shown that a calibration, using O3 and temperature in addition to a reference NO2 measurement, improves the prediction in terms of R2 from less than 0.5 to 0.69–0.84. The uncertainty of the calibrated sensors meets the Data Quality Objective for indicative methods specified by the EU directive in some cases and it was verified that the sensor signal itself remains an important predictor in the multilinear regressions. In practice, these sensors are likely to be calibrated over a period (much) shorter than one year. This study shows the dependence of the quality of the calibrated signal on the choice of these short (monthly) calibration and validation periods. This information will be valuable for determining short-period calibration strategies.

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AP1.2 - A novel flexible room-temperature NO2 sensor based on WO3 integrated with white LED lamps

10.5162/imcs2018/ap1.2 ◽

2018 ◽

Author(s):

X. Geng ◽

C. Zhang ◽

H. Charlier ◽

M. Debliquy ◽

D. Lahem ◽

...

Keyword(s):

Room Temperature ◽

White Led ◽

No2 Sensor

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Proposal of Web Framework for Ubiquitous Sensor Network and Its Trial Application Using NO2 Sensor Mounted on Bicycle

2012 IEEE/IPSJ 12th International Symposium on Applications and the Internet ◽

10.1109/saint.2012.20 ◽

2012 ◽

Cited By ~ 3

Author(s):

Takayuki Nakamura ◽

Yukio Kikuya ◽

Yutaka Arakawa ◽

Motonori Nakamura ◽

Yuka Higashijima ◽

...

Keyword(s):

Sensor Network ◽

Web Framework ◽

No2 Sensor

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Medium-Low-Temperature NO2 Sensor Based on YSZ Solid Electrolyte and Mesoporous WO3 Sensing Electrode for Detection of Vehicle Emissions

NANO ◽

10.1142/s1793292021500831 ◽

2021 ◽

pp. 2150083

Author(s):

Cheng Zhang ◽

Chuning Jiang ◽

Xiaohong Zheng ◽

Xin Hong

Keyword(s):

Low Temperature ◽

Electromotive Force ◽

Electrochemical Impedance ◽

Yttria Stabilized Zirconia ◽

Mixed Potential ◽

Stabilized Zirconia ◽

Excellent Performance ◽

Hard Template ◽

No2 Sensor ◽

Hard Template Method

A mixed potential-type NO2 sensor was fabricated using yttria-stabilized zirconia (YSZ) as the electrolyte and mesoporous WO3 as the sensing electrode for the detection of NO2 in vehicle exhausts. The mesoporous WO3 with a diameter of 7 nm was synthesized using the hard template method. The sensor showed excellent performance in the detection of 30–500[Formula: see text]ppm of NO2 at 300∘C and 500∘C. However, commercial WO3 only operate well at 500∘C. The response of the mesoporous WO3 was higher and the test temperature was lower compared to that of commercial WO3. XPS combined with NO2-TPD was used to explain the high activity of mesoporous WO3 at medium-low temperature, and the mechanism of mixed electromotive force was verified by electrochemical impedance spectroscopy. Furthermore, the sensor exhibited high NO2 selectivity in the presence of interfering gases, such as NO, CO, CO2 and NH3. Most importantly, the sensor had excellent repeatability and stability.

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UV-enhanced NO2 sensor using ZnO quantum dots sensitized SnO2 porous nanowires

Nanotechnology ◽

10.1088/1361-6528/ac49c1 ◽

2022 ◽

Author(s):

Tianchen Jiang ◽

xin liu ◽

jianbo sun

Keyword(s):

Quantum Dots ◽

Gas Sensor ◽

Uv Irradiation ◽

Gas Sensing ◽

Complex Impedance ◽

Sensing Properties ◽

Sensing Mechanism ◽

No2 Sensor ◽

Zno Quantum Dots ◽

Uv Excitation

Abstract ZnO quantum dots sensitized SnO2 porous nanowires were fabricated and designed for UV excitation gas sensor. The ZnO/SnO2 composite (SZQ1%) with the molar proportion of 1:100 exhibits excellent sensing properties to NO2 gas under UV irradiation at 40oC. The humidity stability of SZQ1% was also measured and discussed by DC reversed circuit and complex impedance curves. The gas sensing mechanism is well discussed and illustrated to the ZnO quantum dots sensitized and the increased photo-generated carriers under UV irradiation.

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