A method for improving the stability of perovskite materials in water using co-intercalation polymers
A technology of perovskite materials and polymers, applied in the field of nanomaterials, can solve the problems of difficult synthesis of composite materials, poor stability of perovskite quantum dots, unfavorable dispersibility, etc., to achieve controllable biodegradation rate and shorten reaction time. , the effect of good stability
Active Publication Date: 2021-01-29
FUZHOU UNIV
View PDF1 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, the core problem faced by these applications is that the stability of perovskite quantum dots in the aqueous environment is poor.
In order to solve this problem, researchers have adopted many methods, mainly including (1) wrapping a layer of super-hydrophobic polymer material on the surface of the device to achieve the effect of blocking water vapor ( Adv. Funct. Mater. 2017, 27, 1604382 ), but this is not conducive to its dispersibility in aqueous solution
(2) Use metal oxide embedding and cation doping, such as silicon dioxide embedding ( Angew. Chem. Int. Ed. 2016, 55, 7924–7929 ), Mn 2+ ion doping ( J. Am. Chem. Soc. 2017, 139, 11443−11450 ), this strategy improves its water vapor stability, but the synthetic operation of the composite is difficult
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment
[0023] 1. Weigh 2.5 g of purified ε- CL, 0.5 g PEG and 30 μl containing 50 mg / ml Sn(Oct) 2 Put it into a dry polymerization tube, vacuumize it and then fill it with nitrogen, repeat the operation three times and then vacuum seal the tube; place the polymerization tube in an environment of 140 °C for 20 h of polymerization reaction. After the polymerization reaction was completed, the obtained crude product was dissolved in about 100 mL of chloroform, slowly added dropwise to 500 mL of anhydrous ether for precipitation under mechanical stirring, and then centrifuged at 0°C and 10,000 rpm for 3 min , remove the unreacted monomer and catalyst, and then dry the precipitate under vacuum at 37 °C for 24 h to obtain PEG-PCL.
[0024] 2. Weigh 0.05 mmol of cesium carbonate and 0.15 mmol of lead bromide, and quickly add 5 mL of mineral oil, 0.25 mL of oleic acid, and 0.25 mL of oleylamine to them. The resulting mixed solution was placed in an ultrasonic cell pulverizer and ultrasoni...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a method for improving the stability of a perovskite material in water by using a co-embedded polymer, which uses cesium carbonate and lead bromide as reactants, oleic acid and oleylamine as surface ligands, and uses mineral oil to seal Finally, the all-inorganic halogen perovskite nanomaterial CsPbBr was obtained by ultrasonic 3 ; subsequently, using amphiphilic polyethylene glycol-polycaprolactone (PEG-PCL) co-embedded polymer as embedding material, forming CsPbBr 3 @PEG‑PCL complex where CsPbBr 3 Embedded in the hydrophobic block of PCL, and the PEG hydrophilic block can form a colloid in the aqueous environment to greatly improve the stability of the perovskite composite in the aqueous environment. The resulting composite is expected to expand the perovskite The application of mineral materials in biology and detection.
Description
technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a method for improving the stability of perovskite materials in water by using co-embedded polymers. Background technique [0002] All-inorganic halogen perovskite nanomaterials are widely used in solar cells, LEDs, photodetectors, biosensors, and bioimaging due to their excellent optical properties such as high quantum yield, narrow half-width, and high carrier mobility. very broad. However, the core problem faced by these applications is the poor stability of perovskite quantum dots in aqueous environments. In order to solve this problem, researchers have adopted many methods, mainly including (1) wrapping a layer of super-hydrophobic polymer material on the surface of the device to achieve the effect of blocking water vapor ( Adv. Funct. Mater. 2017, 27, 1604382 ), but this is not conducive to its dispersibility in aqueous solution. (2) Use metal oxi...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/664C08G63/85C01G21/00B82Y30/00
CPCB82Y30/00C01G21/006C01P2002/34C08G63/664C08G63/823
Inventor 罗芳李诗情祖叶馨林振宇郭隆华邱彬
Owner FUZHOU UNIV