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Based on mxene/sno 2 Heterojunction passive wireless ammonia gas sensor and preparation method

A gas sensor, passive wireless technology, applied in chemical instruments and methods, nanotechnology for materials and surface science, instruments, etc., can solve the problems of enhanced gas sensing performance, higher than 100 ℃, unsatisfactory characteristics, etc. Achieve the effects of enhanced gas sensing performance, simple process flow, and improved response/recovery speed

Active Publication Date: 2021-10-15
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Semiconductor gas sensors used to detect ammonia usually have a broad application background in the fields of industrial production, agriculture and animal husbandry detection, and traditional metal oxide semiconductor gas sensors are not ideal for gas characteristics at low temperatures. The best working temperature is usually higher than 100°C, so it is necessary to install a heating wire on the sensor to increase the energy of the electrons through thermal excitation to achieve the purpose of enhancing the gas sensing performance

Method used

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  • Based on mxene/sno <sub>2</sub> Heterojunction passive wireless ammonia gas sensor and preparation method
  • Based on mxene/sno <sub>2</sub> Heterojunction passive wireless ammonia gas sensor and preparation method
  • Based on mxene/sno <sub>2</sub> Heterojunction passive wireless ammonia gas sensor and preparation method

Examples

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Effect test

Embodiment 1

[0032] A MXene / SnO-based 2 A heterojunction passive wireless ammonia sensor consists of a gas-sensing material and an LC resonant antenna, the gas-sensing material is coated on the surface of the interdigitated electrode of the LC resonant antenna, and the coating thickness is 100 μm. The gas sensitive material composition is MXene and SnCl 4 ·5H 2 O is mixed according to the mass fraction ratio of 2:1, and the MXene / SnO generated under the hydrothermal condition of 180°C for 12h 2 Heterojunction Composite Nanomaterials.

[0033] The preparation method comprises the following steps:

[0034] Step 1, preparation of layered MXene materials: LiF and Ti 3 AlC 2Mix according to the mass fraction ratio of 2:1, slowly add into 9mol / L hydrochloric acid while stirring, stir at 60°C for 48 hours, and the etched powder is repeatedly washed with deionized water (DI) and centrifuged until The pH value of the supernatant was 6. The collected powder obtained by centrifugation was sonic...

Embodiment 2

[0040] A MXene / SnO-based 2 The passive wireless ammonia gas sensor is composed of a gas-sensitive material and an LC resonant antenna, the gas-sensitive material is coated on the surface of the interdigitated electrode of the LC resonant antenna, and the coating thickness is 1 μm. The gas sensitive material composition is MXene and SnCl 4 ·5H 2 O is mixed according to the mass fraction ratio of 1:1, and the MXene / SnO generated under the hydrothermal condition of 160°C for 18h 2 Heterojunction Composite Nanomaterials. The preparation method comprises the following steps:

[0041] Step 1, preparation of layered MXene materials: LiF and Ti 3 AlC 2 Mix according to the mass fraction ratio of 1:1, slowly add into 9mol / L hydrochloric acid while stirring, stir at 35°C for 72 hours, and the etched powder is repeatedly washed with deionized water (DI) and centrifuged until The pH value of the supernatant was 5, and the collected powder obtained by centrifugation was sonicated for...

Embodiment 3

[0045] A MXene / SnO-based 2 A heterojunction passive wireless ammonia sensor consists of a gas-sensing material and an LC resonant antenna, the gas-sensing material is coated on the surface of the interdigitated electrode of the LC resonant antenna, and the coating thickness is 50 μm. The gas sensitive material composition is MXene and SnCl 4 ·5H 2 O is mixed according to the mass fraction ratio of 1:2, and the MXene / SnO generated under the hydrothermal condition of 200 ° C for 6 h 2 Heterojunction Composite Nanomaterials. The preparation method comprises the following steps:

[0046] Step 1, preparation of layered MXene materials: LiF and Ti 3 AlC 2 Mix according to the mass fraction ratio of 6:1, slowly add into 9mol / L hydrochloric acid while stirring, stir at 80°C for 24 hours, and the etched powder is repeatedly washed with deionized water (DI) and centrifuged until The pH value of the supernatant was 7, and the collected powder obtained by centrifugation was sonicate...

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Abstract

The invention belongs to the technical field of electronic components and relates to an MXene / SnO-based 2 A heterojunction passive wireless ammonia gas sensor and a preparation method thereof. The passive wireless ammonia gas sensor includes an inductance part and a wireless resonant antenna. The wireless resonant antenna is mainly composed of a gas-sensitive material and a wireless interdigital electrode. The gas-sensitive material is coated on the surface of the interdigital electrode, and the coating thickness is 1-2 100μm; the gas-sensing material is layered MXene / SnO 2 heterojunction materials. The present invention adopts chemical corrosion method to obtain a layered structure MXene material, adopts hydrothermal method to obtain MXene / SnO 2 heterojunction materials. The invention prepares a passive wireless ammonia gas sensor with the advantages of low passive power consumption, easy wireless measurement, fast response / recovery time, easy integration with other microelectronic devices, and the like.

Description

technical field [0001] The invention belongs to the technical field of electronic components, in particular to MXene / SnO-based 2 A heterojunction passive wireless ammonia gas sensor and a preparation method thereof. Background technique [0002] Ammonia is a gas of great concern in industry and biology. Effective detection of toxic and harmful gases is particularly important for environmental monitoring and human health protection. Real-time monitoring of ammonia has been implemented in the poultry industry. For example, ammonia levels above 10ppm in chicken houses for more than six weeks can lead to mass mortality. The detection of ammonia in the breath (at the ppb level) can be used for pathological diagnosis of the digestive system. Therefore it is particularly important to develop a sensor that can accurately detect the content of ammonia to ensure that people can take preventive measures in time. [0003] Semiconductor gas sensors used to detect ammonia usually have ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/22C01G19/02C01B32/90B82Y30/00
CPCB82Y30/00C01G19/02C01B32/90G01N27/221G01N2027/222
Inventor 何婷婷李晓干黄宝玉
Owner DALIAN UNIV OF TECH
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