High-performance quantum dot-polymer fluorescent nano composite material and preparation method thereof

A technology of fluorescent nano-composite materials, applied in the field of high-performance quantum dot-polymer fluorescent nanocomposite materials and their preparation, can solve the problems of loss of luminescent properties and no reports of quantum dots

Inactive Publication Date: 2010-06-30
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the surface of quantum dots is very fragile and easy to be destroyed during use, resulting in loss of luminescent properties. Combining quantum dots with polymers can not only maintain the characteristics of quantum dots but also have good processing properties and mechanical properties (J.Mater.Chem ., 2008, 18, 214-220; J.Am.Chem.Soc.2007, 129, 12828-12833; Langmuir2007, 23, 850-854)
At present, there have been many reports on the compounding of quantum dots and polymers, but these reports have focused on the luminescent properties of the compounded quantum dots and polymers, and there have been no reports on the impact of quantum dots on the mechanical properties of polymers after compounding (Chem .Mater.2004, 16, 1240-1243; Chem.Mater.2007, 19, 2930-2936; Macromolecules 2002, 35, 8400-8404)

Method used

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  • High-performance quantum dot-polymer fluorescent nano composite material and preparation method thereof
  • High-performance quantum dot-polymer fluorescent nano composite material and preparation method thereof
  • High-performance quantum dot-polymer fluorescent nano composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] After dissolving 1g of polymethyl methacrylate with ethyl acetate, add 0.08g of silica hybrid with a particle size of 12 nm modified with 3-(trimethoxysilyl)propyl methacrylate. The cadmium telluride quantum dots were stirred for 5 hours, and the ethyl acetate was naturally placed to remove ethyl acetate to obtain a cadmium telluride-polymethyl methacrylate nanocomposite material. The transmission electron microscope image of the film is attached figure 1 As shown, 3-(trimethoxysilyl)propyl methacrylate-modified silica hybrid cadmium telluride quantum dots are uniformly dispersed in polymethylmethacrylate, high-resolution transmission electron microscopy It is confirmed that the crystal structure of CdTe quantum dots is well maintained, so the resulting film has both strong transparency and excellent luminescent properties.

Embodiment 2

[0019] Heating 1g of polystyrene to 150°C, then adding 0.005g of silicon dioxide hybrid cadmium selenide quantum dots with a particle size of 20 nm modified with propyltriethoxysilane, stirred for 1 hr, and cooled naturally to obtain Cadmium selenide-polystyrene nanocomposites. Its tensile stress-strain curve is attached as figure 2 As shown, compared with pure polystyrene, its Young's modulus increased by 42%, and its elongation at break increased by 6%.

Embodiment 3

[0021] Embodiment 3 is the same as embodiment 2, just the addition of the silicon dioxide hybridized cadmium selenide quantum dots of 20 nanometers is changed into 0.0015g to the particle diameter modified by propyl triethoxysilane, obtains cadmium selenide-poly Styrene nanocomposites. Its tensile stress-strain curve is attached as figure 2 As shown, compared with pure polystyrene, its tensile strength at break increased by 11%, Young's modulus increased by 33%, and elongation at break increased by 12%.

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Abstract

The invention discloses a high-performance quantum dot-polymer fluorescent nano composite material and a preparation method thereof. The high-performance quantum dot-polymer fluorescent nano composite material comprises polymer and quantum dot which has fluorescent property and is hybridized by silicon dioxide. The method comprises the following steps of: firstly, dissolving 1g of polymer by using a solvent or heating 1g of polymer into a molten state, then adding 0.0002-0.08g of quantum dot which has the particle diameter of 5-30 nanometers, is not modified or is modified by using silane coupling agent and is hybridized by the silicon dioxide and removing the solvent or cooling naturally after stirring for 2min-24hr to obtain the quantum dot-polymer nano composite material. The nano composite material has very strong photoinduced fluorescent property, and the mechanical property of the nano composite material is also enhanced greatly in comparison with that of a corresponding straight polymer. The high-performance quantum dot-polymer fluorescent nano composite material has simple preparation and is suitable for mass production. The invention has very good application prospect in the aspects of preparing an optical device and an optical material, replacing a traditional polymer material and the like.

Description

technical field [0001] The invention relates to the field of inorganic-polymer nanocomposite materials, in particular to a high-performance quantum dot-polymer fluorescent nanocomposite material and its preparation method Background technique [0002] Quantum dots have been widely used in biomarkers, optical devices, and solar cells due to their unique size-dependent luminescence properties, broad excitation peaks, and narrow emission peaks. However, the surface of quantum dots is very fragile and easy to be destroyed during use, resulting in loss of luminescent properties. Combining quantum dots with polymers can not only maintain the characteristics of quantum dots but also have good processing properties and mechanical properties (J.Mater.Chem ., 2008, 18, 214-220; J. Am. Chem. Soc. 2007, 129, 12828-12833; Langmuir 2007, 23, 850-854). At present, there have been many reports on the compounding of quantum dots and polymers, but these reports have focused on the luminescen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L33/12C08L33/14C08L29/04C08L25/06C08L33/26C08L77/02C08L77/06C08L23/06C08L23/12C08L67/02C08K3/36C08K3/30C08K9/06C09K11/88
Inventor 周立高超
Owner ZHEJIANG UNIV
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