Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Surface plasma fluorescence-enhanced nano composite structure film and preparation method thereof

A surface plasmon and nanocomposite technology, which is applied in the thin film of metal nanoparticle/SiO2/quantum dot nanocomposite structure and its preparation, can solve the application limitations, poor light stability of luminescent quantum dots and organic light-emitting small molecules, etc. problem, to achieve the effect of eliminating the flicker effect, improving the fluorescence quantum efficiency, and high application value

Inactive Publication Date: 2010-12-08
UNIV OF JINAN
View PDF3 Cites 29 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The single photon source can be an organic light-emitting molecule or a semiconductor quantum dot, but the current actual situation is due to the lack of properties of the light-emitting quantum dot and the organic light-emitting small molecule (such as poor photostability of organic molecules, quantum dots show flickering effect etc.), resulting in the limitation of their applications in this area, so the research and development of new single photon sources has become a challenge in this research field

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 more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Surface plasma fluorescence-enhanced nano composite structure film and preparation method thereof
  • Surface plasma fluorescence-enhanced nano composite structure film and preparation method thereof
  • Surface plasma fluorescence-enhanced nano composite structure film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 1.1 Synthesis of CdSe quantum dots by organic method (see J. Phys. Chem. C, 2010, 114, 6205-6215 for details): First, 500 mg of cadmium oxide, 2 g of dioctylamine, and 2 g of nonanoic acid were mixed in three Mix in the neck flask, keep vacuum at 100°C for 15 minutes, then heat to 200°C under nitrogen protection to dissolve cadmium oxide, then lower it to 120°C, put 10 g of selenium in trioctylphosphine (TOP) solution (the mass of selenium Concentration is 10 %) injected quickly, in order to control the luminous color, the growth time is 10 minutes, after separation, washing, and finally dispersed in toluene solution.

[0041] 1.2 Coating ZnS shell on the surface of CdSe quantum dots (see J. Phys. Chem. C, 2010, 114, 6205-6215 for details): freshly prepared CdSe quantum dots toluene solution 4 mL (quantum dot concentration 0.01 mg / mL) , 2 g of dioctylamine, mixed with 0.05 g of dimethyl zinc (dissolved in 2 mL of trioctylphosphine (TOP)), then heated to 60 ° C, and 10 g...

Embodiment 2

[0047] 2.1 The preparation method of CdSe / ZnS core-shell quantum dots is the same as that in Examples 1.1 and 1.2 above.

[0048] 2.2 The preparation of Au nanoparticles is the same as in Example 1.3 above.

[0049] 2.3 Take 1 mL of aminoethyltrimethylsilane, 0.3 mL of water, and 10 mL of methanol, mix and stir for 10 hours, remove the methanol in the solution at 60°C to obtain solution 1; add 0.2 mL of solution 1 to the newly synthesized CdSe / ZnS Quantum dots in 0.2 mL of toluene solution (quantum dot concentration 5 mg / mL) were stirred for 0.5 to 5 minutes to obtain solution 2.

[0050] 2.4 Mix 0.5 mL of Au nanoparticles solution (the concentration of nanoparticles is 0.05 ~ 10 mg / mL) with 0.2 mL of 25 wt% ammonia water and 4 mL of ethanol, add 10 μL of methyl orthosilicate, react for 3 hours, and then centrifuge , and dispersed the coated gold nanoparticles into 1 mL of water to obtain solution 3 (5-30% by mass).

[0051] 2.5 Take 0.1 mL of solution 2 and 0.15 mL of solut...

Embodiment 3

[0053] 3.1 The preparation method of CdSe / ZnS core-shell quantum dots is the same as that in Examples 1.1 and 1.2 above.

[0054] 3.2 The preparation of Au nanoparticles is the same as in Example 1.3 above

[0055] 3.3 Take 15 mL of aminomethyltrimethylsilane, add 2.5 mL of water and 50 mL of propanol, mix and stir for 30 hours, remove the propanol in the solution at 70°C to obtain solution 1; add 0.3 mL of solution 1 to the newly synthesized CdSe / ZnS quantum dots in 0.5 mL of toluene solution (quantum dot concentration 0.05 mg / mL) was stirred for 0.5 to 5 minutes to obtain solution 2.

[0056] 3.4 Mix 2 mL of Au nanoparticle solution (the concentration of nanoparticles is 0.05 ~ 10 mg / mL) with 0.5 mL of 25 wt% ammonia water and 10 mL of ethanol, add 15 μL of propyl orthosilicate, react for 2 hours, and then centrifuge , and dispersed the coated gold nanoparticles into 1 mL of water to obtain solution 3 (5-30% by mass).

[0057] 3.5 Take 0.4 mL of solution 2 and 0.2 mL of solu...

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

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses a surface plasma fluorescence-enhanced nano composite structure film, which has the components of SiO2 with amino and composite nanoparticles with a nano composite structure, wherein the cores of the composite nanoparticles are metal nanoparticles, and the outer layers are quantum dots; and the metal nanoparticles are connected with the quantum dots through a SiO2 layer with the thickness of 4 to 30nm. The surface plasma fluorescence enhancement effect caused by the nano composite structure in the film makes fluorescence quantum efficiency of the quantum dots in the film greatly improved and the scintillation effect thereof eliminated. The invention also discloses a method for preparing the film. The nano composite structure film prepared by the method overcomes the defects of the quantum dots, which has great significance for applying the quantum dots in medicaments, biological detection, photoelectric conversion and Raman scattering, particularly using the quantum dots as single photon source in the field of quantum dot coding.

Description

technical field [0001] The invention relates to a metal nanoparticle / SiO containing enhanced surface plasmon fluorescence 2 A thin film of quantum dot nanocomposite structure and a preparation method thereof. Background technique [0002] The research on the surface plasmon fluorescence enhancement effect is a new research field emerging in the last decade. When the electromagnetic wave propagates in parallel in one direction on the interface between the metal and the dielectric, the free electrons on the metal surface are regularized under the action of an external electromagnetic field of a certain frequency. Movement produces surface plasmon resonance, which can greatly enhance the electromagnetic field around the metal particles. The enhancement of this surface local electromagnetic field improves the excitation efficiency of quantum dots close to the metal surface, leading to the generation of fluorescence enhancement effect. The generation of this effect is strongly d...

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
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/88C09K11/70B82B3/00
Inventor 杨萍张爱玉曹永强
Owner UNIV OF JINAN
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com