CN-114894853-B - Nitrogen dioxide sensor based on conjugated organic framework/perovskite compound

Abstract

The invention discloses a high-selectivity nitrogen dioxide sensor based on a conjugated organic framework/perovskite compound, and a preparation method and application thereof. Specifically, the nitrogen dioxide sensor comprises a film material and an interdigital electrode, wherein the film material is a conjugated organic framework TpPa-1/perovskite Cs 2 PdBr 6 compound, and the film material is dripped on the interdigital electrode, and the thickness of the film material is 10-100 mu m. The nitrogen dioxide sensor has the advantages of convenience in preparation, simplicity in operation, capability of detecting nitrogen dioxide (40 ppb) with extremely low concentration and relatively stable device performance.

Inventors

• LU JIANMEI
• HE JINGHUI

Assignees

• 苏州大学

Dates

Publication Date

20260512

Application Date

20220329

Claims (2)

1. 1. A method for detecting nitrogen dioxide by using a nitrogen dioxide sensor based on a conjugated organic frame/perovskite compound is characterized by comprising the steps of placing the nitrogen dioxide sensor based on the conjugated organic frame/perovskite compound into a detection system, electrifying to complete detection of nitrogen dioxide, coating a membrane material and interdigital electrodes on the nitrogen dioxide sensor based on the conjugated organic frame/perovskite compound, wherein the membrane material is a conjugated organic frame TpPa-1/perovskite Cs 2 PdBr 6 compound, the thickness of the membrane material is 10-100 mu m, mixing perovskite Cs 2 PdBr 6 , conjugated organic frame TpPa-1 and a solvent to obtain a conjugated organic frame TpPa-1/perovskite Cs 2 PdBr 6 compound solution, heating the conjugated organic frame TpPa-1/perovskite Cs 2 PdBr 6 compound solution on the interdigital electrodes to obtain a nitrogen dioxide sensor based on the conjugated organic frame/perovskite compound, and drying the nitrogen dioxide sensor based on the conjugated organic frame/perovskite compound at a temperature of 40-62 DEG C6-62 to-6 dB6 for a weight ratio of P6:6.6-62.C.
2. 2. A method for detecting nitrogen dioxide according to claim 1, wherein the detection of nitrogen dioxide is accomplished based on an electrical current.

Description

Nitrogen dioxide sensor based on conjugated organic framework/perovskite compound Technical Field The invention belongs to the technical field of semiconductor materials, and particularly relates to a nitrogen dioxide sensor based on a conjugated organic framework TpPa-1/perovskite Cs 2PdBr6 compound, a preparation method thereof and application thereof in environmental nitrogen dioxide detection. Background Modern society is highly dependent on the energy generated by the combustion of fossil fuels, and data indicate that the gases emitted by internal combustion engines of automobiles can cause serious environmental and health problems. Nitrogen dioxide, a representative gas of nitrogen oxides, is recognized as the most dangerous air pollutant, and is also an important biomarker for lung tissues and irritable bowel diseases, and high-sensitivity detection has important significance in the fields of environmental protection, human health detection and the like. The real-time monitoring of nitrogen dioxide is therefore of interest to researchers. In order to meet the requirements of the current market on the aspects of low price, practicability, easy preparation and the like of the sensor, development of a novel nitrogen dioxide sensor is needed. Disclosure of Invention In view of the above, the present invention employs conjugated organic frameworks TpPa-1/perovskite Cs 2PdBr6 complexes to prepare nitrogen dioxide sensors and detects different concentrations of nitrogen dioxide by observing the current change of the sensor at different nitrogen dioxide concentrations. The invention tests the current change of the nitrogen dioxide sensor under the nitrogen dioxide with different concentrations and the resilience of the device, firstly, the device is placed in a pure nitrogen environment to measure the current, and then the content of the nitrogen dioxide in the environment is continuously increased to measure the current. Specifically, the invention adopts the following technical scheme: a nitrogen dioxide sensor based on a conjugated organic framework/perovskite compound comprises a membrane material and interdigital electrodes, wherein the membrane material is the conjugated organic framework TpPa-1/perovskite Cs 2PdBr6 compound. The preparation method of the nitrogen dioxide sensor based on the conjugated organic framework/perovskite compound comprises the following steps of dripping the conjugated organic framework TpPa-1/perovskite Cs 2PdBr6 compound solution on an interdigital electrode, and then heating to obtain the nitrogen dioxide sensor based on the conjugated organic framework/perovskite compound. The temperature of the heating and drying device is 40-90 ℃, the time is 4-6 min, the preferable temperature is 60 ℃, and the time is 5min. The nitrogen dioxide sensor comprises a film material and interdigital electrodes, wherein the thickness of the film material is 10-100 mu m, the interdigital electrodes are existing products, aluminum oxide (Al 2O3) is used as a substrate, silver-palladium alloy (Ag-Pd) is arranged on the substrate, the interdigital width of the interdigital electrodes is 200-300 mu m, the interdigital distance is 100-200 mu m, the thickness of the substrate is 1-2 mm, and the thickness of the silver-palladium alloy is 100-200 nm. The invention discloses an application of a conjugated organic framework TpPa-1/perovskite Cs 2PdBr6 compound in preparation of a nitrogen dioxide sensor, or an application of a conjugated organic framework TpPa-1/perovskite Cs 2PdBr6 compound in preparation of a nitrogen dioxide sensor film material. According to the invention, the conjugated organic frame TpPa-1, the solvent and the perovskite Cs 2PdBr6 are mixed to obtain the conjugated organic frame TpPa-1/perovskite Cs 2PdBr6 composite solution, the solvent is a conventional organic solvent, the mixing is ultrasonic dispersion or stirring, and the weight ratio of the conjugated organic frame TpPa-1 to the perovskite Cs 2PdBr6 is 6-40:32. As an example, the conjugated organic frame TpPa-1 and the alcohol solvent are subjected to ultrasonic dispersion to obtain a conjugated organic frame TpPa-1 dispersion, the ultrasonic dispersion time is preferably 0.5-2 h, the using amount ratio of TpPa-1 and tertiary butanol is 20-40 mg:10 mL, preferably 30 mg:10 mL, the perovskite Cs 2PdBr6, the solvent and the conjugated organic frame TpPa-1 dispersion are stirred and mixed to obtain a conjugated organic frame TpPa-1/perovskite Cs 2PdBr6 composite solution, the stirring speed is preferably 800-3000 rpm, the using amount ratio of the perovskite Cs 2PdBr6 and the dispersing solvent is 150-180 mg:1 mL, preferably 160 mg:1 mL, the dispersing solvent is a mixed solvent of N, N-dimethylformamide and dimethyl sulfoxide, preferably N, N-dimethylformamide and dimethyl sulfoxide, and the volume ratio of the dispersing solvent to the dimethyl sulfoxide is 1:1. Preferably, the perovskite Cs 2PdBr6 and the dispersing solvent