Perovskite quantum dot material with gas-sensitive property and application thereof

A quantum dot material and perovskite technology, applied in the direction of luminescent materials, analytical materials, material resistance, etc., can solve the problems of unstable performance, poor gas selectivity, etc., and achieve the effect of reducing the density of defect states, increasing the response, and improving the sensitivity

Pending Publication Date: 2022-05-27
江苏烨湫传感科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, this application provides a perovskite quantum dot material with gas-sensing properties and its application. Through the introduction of metal-organic ligands, the metal atoms in the metal-organic ligands have a certain relationship with the gas. Interaction, so that it can respond to specific gases, solve the existing technical problems such as unstable performance and poor gas selectivity, in order to improve the response sensitivity and stability of quantum dot materials to various gas components

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  • Perovskite quantum dot material with gas-sensitive property and application thereof
  • Perovskite quantum dot material with gas-sensitive property and application thereof
  • Perovskite quantum dot material with gas-sensitive property and application thereof

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Embodiment 1

[0034]A gas-sensitive perovskite quantum dot material, the perovskite quantum dot material having gas-sensitive properties consists of a quantum dot core and a surface ligand, the quantum dot core is a metal halide perovskite quantum dot 4 or a metal oxide cladding layer 5 coated metal halide perovskite quantum dots, the surface ligand is an organic acid 1, at least one of the organic amine 3 and a metal-organic ligand 2; the molecular end of the surface ligand is connected by a weak coordination bond and the quantum dot core, The ligand molecules are freely divergent from the quantum dot core outwards; the preparation method of the perovskite quantum dot material with gas-sensitive properties is: 0.05 g cesium carbonate is dissolved in a 0.1mL oleic acid solution on the balance, and the stirring heating table is fully stirred until fully dissolved to obtain a cesium precursor. On the balance, 0.03g of lead bromide and 0.1g of octylamine were weighed, and dissolved in 8mL of tolue...

Embodiment 2

[0042] Preparation method of perovskite quantum dot material with gas-sensitive properties, the steps are:

[0043]Step 1: Preparation of material: 0.5g cesium carbonate is weighed on the balance dissolved in 0.8mL oleic acid solution, and well stirred on the stirring heating table until fully dissolved to obtain the cesium precursor. 0.7 g of lead bromide and 0.9 g of octylamine were weighed on the balance, and dissolved in 10 mL of toluene, and then 0.5 mL of oleic acid and 0.6 mL octylamine were added sequentially, and the lead precursor was obtained by stirring thoroughly on the heating table until dissolved. Take 2mL of lead precursor and 1mL of cesium precursor mixed, stirred on a heating table for 2 hours to obtain cesium lead bromoperovskite quantum dot solution. The solution is yellow in color and glows green under the illumination of ultraviolet light. In the magnetic stirring process, 0.01 mmol of iron acetylacetonate, 0.1 mL of oleic acid and 0.1 mL of octylamine were ...

Embodiment 3

[0049] Preparation method of perovskite quantum dot material with gas-sensitive properties, the steps are:

[0050]Step 1: Preparation of material: Weigh 0.7g of methyl carbonate on the balance dissolved in 2mL oleic acid solution, stir well on the stirring heating table until fully dissolved to obtain a methylamine precursor. 0.8g lead bromide and 0.6g octylamine were weighed on the balance, and dissolved in 6mL of toluene, and then 8mL of oleic acid and 0.6mL octylamine were added sequentially, and thoroughly stirred on the heating table until dissolved to give lead precursors. Take 0.9mL of lead precursor and 0.6mL of cesium precursor mixed, stirred on the heating table for 2 hours to obtain methylamine lead bromoperite quantum dot solution. The solution is yellow in color and glows green under the illumination of ultraviolet light. In the process of magnetic stirring, 0.01mmol of titanium acetylacetonate, 0.1mL of oleic acid and 0.1mL of octylamine were added to the quantum do...

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Abstract

The invention discloses a perovskite quantum dot material with gas-sensitive performance and application thereof, and belongs to the technical field of nano material preparation, the perovskite quantum dot material is composed of a quantum dot core and a surface ligand, the quantum dot core is a metal halide perovskite quantum dot or a metal oxide coated metal halide perovskite quantum dot; the structural formula of the metal halide perovskite quantum dot is at least one of APbX3, A4PbX6, APb2X5, A2PbX4, A3Pb2X9 and Am-1Pbm + 1X3m + 1, and m is greater than or equal to 2; the surface ligand comprises fatty amine, amide, carboxylic acid or a metal organic ligand, one end of a molecule of the surface ligand is connected with the quantum dot core through a weak coordinate bond, and the metal organic ligand can prevent moisture, hydrogen sulfide and other atmospheres from damaging the perovskite structure, so that the stability of the material is improved; meanwhile, the metal organic ligand not only interacts with the perovskite, but also interacts with the organic acid and the organic amine, and has great advantages and application prospects in the aspect of gas detection.

Description

Technical field [0001] The present invention belongs to the field of quantum dot sensing materials, nanomaterials preparation technology, in particular to a perovskite quantum dot material having gas-sensitive properties and its applications. Background [0002] Quantum dots are a class of inorganic semiconductor nanocrystals with quantum effects, which exhibit a series of novel physicochemical effects due to their particle size falling to a scale comparable to the Boer radius of the material exciton, and have become one of the important research frontiers in the fields of electronics, optoelectronics, optics and biology in recent years. Quantum dot gas sensors mainly use the electron transfer caused by the chemical reaction of gas on the semiconductor surface to convert gas molecular information into electrical signals such as sensor resistance value to achieve detection. The use of gas sensors and their instruments can realize the on-site rapid detection and real-time monitorin...

Claims

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Application Information

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IPC IPC(8): C09K11/66C09K11/06C09K11/02B82Y20/00B82Y40/00G01N27/12
CPCC09K11/665C09K11/663C09K11/664C09K11/06C09K11/02C09K11/025B82Y20/00B82Y40/00G01N27/125G01N27/127
Inventor 肖植文黄勇黄辉
Owner 江苏烨湫传感科技有限公司
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