Mixed-potential type NO2 sensor with mesh-strip structured YSZ (yttria-stabilized zirconia) substrate serving as conductive layer and preparation method for mixed-potential type NO2 sensor

A technology of mixed potential type and conductive layer, which is applied in the field of mixed potential type NO2 sensor and its preparation, can solve the problem of uncontrollable surface morphology and achieve good thermal and chemical stability, shape and surface area controllable Effect

Active Publication Date: 2014-02-26
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method of modifying the three-phase interface is that the modified surface morphology is uncontrollable and has great randomness.

Method used

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  • Mixed-potential type NO2 sensor with mesh-strip structured YSZ (yttria-stabilized zirconia) substrate serving as conductive layer and preparation method for mixed-potential type NO2 sensor
  • Mixed-potential type NO2 sensor with mesh-strip structured YSZ (yttria-stabilized zirconia) substrate serving as conductive layer and preparation method for mixed-potential type NO2 sensor
  • Mixed-potential type NO2 sensor with mesh-strip structured YSZ (yttria-stabilized zirconia) substrate serving as conductive layer and preparation method for mixed-potential type NO2 sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The YSZ substrate is laser processed, the horizontal and vertical stripe spacing is 240 μm, and the depth is 10 μm. The width of a single stripe is 50 μm. Other manufacturing processes are the same as the comparative example.

[0052] Table 1 lists the devices made of unprocessed YSZ and laser-processed YSZ substrates with a stripe spacing of 240 μm at different concentrations of NO 2 The difference (ΔV) between the electromotive force in the atmosphere and the electromotive force in the air varies with NO 2 It can be seen from the table that the sensitivity of the device made of the laser-processed YSZ substrate with a stripe spacing of 240 μm has improved, but the change is not much.

[0053] Table 1. The ΔEMF of devices fabricated on unprocessed YSZ and laser-processed YSZ substrates with a stripe spacing of 240 μm versus NO 2 change in concentration

[0054]

Embodiment 2

[0056] The YSZ substrate was processed by laser, the horizontal and vertical stripe spacing was 130 μm, the depth was 10 μm, and the width of a single stripe was 50 μm. Other manufacturing processes were the same as those of the comparative example.

[0057] Table 2 lists the devices made of unprocessed YSZ and laser-processed YSZ substrates with a stripe spacing of 50 μm at different concentrations of NO 2 The difference (ΔV) between the electromotive force in the atmosphere and the electromotive force in the air varies with NO 2 It can be seen from the table that the sensitivity of the device made of the laser-processed YSZ substrate with a stripe spacing of 50 μm has been greatly improved.

[0058] Table 2. ΔEMF of devices fabricated on unprocessed YSZ and laser-processed YSZ substrates with a stripe spacing of 130 μm versus NO 2 change in concentration

[0059]

[0060]

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Abstract

The invention discloses a mixed-potential type NO2 sensor with a laser-machined YSZ (yttria-stabilized zirconia) substrate serving as a conductive layer and a preparation method for the mixed-potential type NO2 sensor and belongs to the technical field of gas sensors. The mixed-potential type NO2 sensor consists of an Al2O3 ceramic plate with a Pt heating electrode, the YSZ substrate with a mesh-strip structure, a reference electrode and a sensitive electrode, wherein strip-type Pt is adopted as the reference electrode; strip-type NiCr2O4 is adopted as the sensitive electrode; the two electrodes are symmetrically arranged at two ends of the upper surface of the YSZ substrate; the lower surface of the YSZ substrate is adhered to the Al2O3 ceramic plate; a strip distance of the mesh-strip structure is 130-240 microns; the mesh-strip structure is 10-25 microns deep; each strip is 50-80 microns wide; electrode leads are prepared on the reference electrode and the sensitive electrode. The sensor is mainly used for detecting automobile exhaust. Due to the mesh-strip structure on the surface of the YSZ substrate, contact between the gas to be detected and an electrolyte is enlarged, reaction active sites are increased, and the aim of improving the sensitivity of the sensor is fulfilled.

Description

technical field [0001] The invention belongs to the technical field of gas sensors, and in particular relates to a mixed potential NO sensor with a YSZ substrate with a mesh stripe structure obtained by a laser processing method as an electrolyte conductive layer. 2 Sensors and methods of making them. Background technique [0002] Nitrogen oxides (NOx) from vehicles x ) is the main cause of urban air pollution. With the rapid growth of car ownership, NO x The resulting environmental problems will become more severe and prominent. For diesel vehicles, due to the high concentration of residual oxygen in the exhaust, the traditional three-way catalyst can no longer effectively remove NO x , it is necessary to add a storage catalyst to the NO x for absorption, NO must be used in this system x sensor. NO x The sensor plays two roles in the new exhaust treatment system: one is to monitor the combustion state of the engine in real time, and the other is to monitor whether th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/407
Inventor 卢革宇梁喜双关瀛洲
Owner JILIN UNIV
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