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Preparation method for CsPbBr3@SiO2 nanoparticles with ultrahigh water stability

A nanoparticle and stability technology, applied in the field of preparation of CsPbBr3@SiO2 core-shell nanoparticle, can solve the problem of inability to effectively control the size of nanocrystals, and achieve high efficiency and good water stability, high efficiency and good fluorescence performance, and water stability sex enhancing effect

Inactive Publication Date: 2020-11-24
NANJING UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Through these works, CsPbBr 3 The stability of nanocrystals has been greatly improved, but there are still the following problems: First, the existing methods mostly generate large-area films and cannot effectively control the size of nanocrystals; second, the prepared nanoparticles are not core-shell structured nanoparticles

Method used

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  • Preparation method for CsPbBr3@SiO2 nanoparticles with ultrahigh water stability
  • Preparation method for CsPbBr3@SiO2 nanoparticles with ultrahigh water stability
  • Preparation method for CsPbBr3@SiO2 nanoparticles with ultrahigh water stability

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Embodiment 1

[0029] 1) 0.1g cesium carbonate (Cs 2 CO 3 ), 1mL of oleic acid (OA) was added into a reaction flask with a capacity of 50mL, and the nitrogen was changed three times under vacuum. Then add 10mL 1-octadecene (ODE) to the reaction bottle with a syringe, heat and stir under nitrogen atmosphere, first set the temperature to 120°C, heat and dry under nitrogen atmosphere for 30min until cesium carbonate is completely dissolved and becomes transparent to obtain cesium oleate solution. After hot injection into lead bromide (PbBr 2 ) before the precursor solution, raise the temperature and keep it at 140°C;

[0030] 2) Add 0.2g PbBr 2 Add it to a reaction flask with a capacity of 50 mL, vacuumize and change nitrogen three times. Then add 10 mL of 1-octadecene (ODE) into the reaction flask with a syringe, heat and stir under nitrogen atmosphere. First set the oil bath temperature to 120 °C, N 2Heat and dry under ambient conditions for 30min; then add 1mL oleic acid (OA), 0.9mL o...

Embodiment 2

[0043] What this embodiment provides is CsPbBr 3 @SiO 2 The test method of nanoparticle solution stability, described preparation method comprises the following steps:

[0044] 1) Choose water and CsPbBr 3 The volume ratio of the toluene solution is 1:1 to test CsPbBr 3 and CsPbBr 3 @SiO 2 The long-term water stability, and continued to stir for a certain period of time, took different periods of the solution for optical performance testing.

[0045] The prepared CsPbBr in this specific example 3 @SiO 2 The characterization results of the nanoparticles are as follows:

[0046] Such as Figure 5 Shown is the water and CsPbBr prepared in this embodiment 3 The volume ratio of the toluene solution is 1:1. The actual measurement map shows that the volume ratio of water and toluene is much higher than the previous report. It can be seen that even after 48h, it still shows good fluorescence imaging (increasing with time A total of 7 photos in 48 hours).

[0047] Such as ...

Embodiment 3

[0050] What this embodiment provides is CsPbBr 3 @SiO 2 The test method of the water stability of nanopowder, described preparation method comprises the following steps:

[0051] 1) The prepared CsPbBr 3 @SiO 2 The nanoparticle solution was washed twice with toluene and methyl acetate, and then dried to obtain CsPbBr 3 @SiO 2 Nano powder.

[0052] 2) The prepared CsPbBr 3 @SiO 2 Powder particles of nanoparticles are placed in pure water to test CsPbBr 3 @SiO 2 Fluorescent Stability of Nanopowders in Pure Water Environment

[0053] The prepared CsPbBr in this specific example 3 @SiO 2 The characterization results of the nanoparticle powder are as follows:

[0054] Such as Figure 8 Shown is the CsPbBr prepared in this embodiment 3 @SiO 2 Fluorescence stability of nanopowders in pure water environment. The results showed that even at 48h, CsPbBr 3 @SiO 2 The nanopowder still exhibits very superior fluorescence properties, indicating that CsPbBr 3 @SiO 2 The s...

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Abstract

The invention relates to a preparation method for CsPbBr3@SiO2 nanoparticles with ultrahigh water stability. The preparation method comprises the following steps: adding 0.1 g of cesium carbonate and0.5-1.5 mL of oleic acid into a reaction flask, adding 1-octadecene into the reaction flask in a nitrogen environment, and carrying out heating to 110-130 DEG C until the cesium carbonate is completely dissolved into a transparent solution so as to obtain cesium oleate; adding PbBr2 into the reaction flask, adding 1-octadecene into the reaction flask in a nitrogen environment, carrying out heatingto 110 -130 DEG C, then adding oleic acid, oleylamine and APTES, and continuing heating until the PbBr2 is completely dissolved; and carrying out heating to 160-180 DEG C, weighing a small amount ofcesium oleate, and quickly adding the cesium oleate into a PbBr2 precursor solution. When a reaction is carried out for 5-15 s, the flask is rapidly subjected to an ice-water bath; when a liquid is gradually changed from yellow to yellow-green, the CsPbBr3 nanoparticles are successfully prepared; and the structural stability and the highly-efficient fluorescence performance are maintained for at least 48 h under the water environment condition.

Description

technical field [0001] The invention belongs to the technical field of semiconductor nanomaterials, in particular to a CsPbBr with ultra-high water stability 3 @SiO 2 Preparation method of core-shell structured nanoparticles. Background technique [0002] Lead halide perovskite materials have a wide range of applications in the field of optoelectronics due to their good physical and chemical properties and optical properties, which has set off an upsurge in the study of perovskite materials. At present, lead halide perovskite materials are mainly used in applications such as fluorescence detectors, light-emitting diodes (LEDs) and solar cells. However, the poor stability of this type of halogen perovskite material greatly limits its wide range of applications, and the perovskite will decompose rapidly under the external environment conditions such as water, oxygen or high temperature, especially in the Rapid decomposition under aqueous environmental conditions is the bigg...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/66B82Y20/00B82Y30/00B82Y40/00
CPCC09K11/025C09K11/665B82Y20/00B82Y30/00B82Y40/00
Inventor 宋文涛姚颖方薛文嘉李文博王程李梦璐王依明邹志刚
Owner NANJING UNIV
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