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Gas sensor based on lead-free halide perovskite and its preparation method

A halide perovskite, gas sensor technology, applied in the field of gas identification, can solve the problems of unfavorable environmental protection, poor sensor chemical and structural stability, low detection limit of NO2, etc.

Active Publication Date: 2021-07-06
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although some progress has been made, the following problems still exist: the chemical and structural stability of the sensor is poor; the use of pb as a toxic element for sensor production is not conducive to environmental protection; 2 The detection limit is not low enough

Method used

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  • Gas sensor based on lead-free halide perovskite and its preparation method
  • Gas sensor based on lead-free halide perovskite and its preparation method
  • Gas sensor based on lead-free halide perovskite and its preparation method

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. Simple modifications to this example are easy and obvious to those skilled in the art.

[0025] The chemical raw materials used in the following examples are cesium iodide (CsI, 99.9%), copper iodide (CuI, 99.95%), N,N dimethylformamide (DMF, 99.8%), dimethylsulfoxide (DMSO , 98%). Cesium halide was used to provide cesium source, copper halide was used to provide copper source, and DMF and DMSO were used as dispersants. The preparation process of the lead-free halide perovskite material is as follows figure 1 .

[0026] The preparation method of the gas sensor based on the lead-free halide perovskite comprises the following steps according to the following proportions of the materials:

[0027] (1) Dissolve 1mmol CsI and 2mmol CuI in a mixed solvent of 1mL DMF and DMSO, the v:v=4:1 of DMF and DMSO, and stir for 1 hour in a glove box at 60°C under vacu...

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Abstract

The present invention provides a gas sensor based on lead-free halide perovskite and a preparation method thereof, (1) 1mmol CsI and 2mmol CuI are dissolved in 1mL of N,N-dimethylformamide and a mixed solvent of dimethyl sulfoxide , stirred under vacuum in a glove box for 1 hour at 60 °C to prepare CsCu 2 I 3 Precursor solution; (2) Spin-coat 100 μL precursor solution onto a clean gold interdigitated electrode at a speed of 3000 rpm to form CsCu 2 I 3 film, and drop 100 μL methyl acetate on the center of the rotating gold interdigitated electrode in the last 5 s; (3) anneal the film at 100 °C for 1 hour in a glove box to evaporate the residual solvent and promote crystallization to make CsCu 2 I 3 gas sensor. The invention is used for detecting nitrogen dioxide gas. The invention detects the environmental pollution gas such as nitrogen dioxide by observing the change of the resistance value of the sensor.

Description

technical field [0001] The invention relates to a gas sensor based on lead-free halide perovskite and a preparation method thereof, which are used for detecting nitrogen dioxide and belong to the technical field of gas identification. Background technique [0002] Nitrogen dioxide (NO 2 ) as the most important environmental pollutant gas will cause great harm to human health, inhaling NO 2 Afterwards, it is highly irritating and corrosive to lung tissue, thus damaging the respiratory tract. In addition, long-term exposure to NO 2 In the polluted gas environment, chronic diseases such as neurasthenia syndrome and chronic respiratory inflammation syndrome will be caused. NO 2 It is also one of the causes of acid rain, and the environmental effects include: the impact on the competition and composition changes between wetland and terrestrial plant species, the reduction of atmospheric visibility, the acidification of surface water, eutrophication, and the increase of harmfu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12
CPCG01N27/125
Inventor 何邕孙霞唐孝生杨洁郭学政伍志林
Owner CHONGQING UNIV