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Preparation method of quantum dot self-assembled film

A technology of self-assembled films and quantum dots, which is applied in measurement devices, manufacturing of microstructure devices, and processes for producing decorative surface effects, etc. Achieving the effect of uniform morphology, simple operation and good film formation

Active Publication Date: 2016-06-29
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chemical effects for forming self-assembled films mainly include electrostatic interactions, hydrophobic interactions, hydrogen bond interactions, and π-π stacking interactions. The effects of these forces are not strong, so when using these forces to form self-assembled films of nanoparticles, film formation The property is not good, the particles are easy to fall off

Method used

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  • Preparation method of quantum dot self-assembled film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Example 1 Preparation method of CdSe nanoparticle self-assembled film on the surface of gold-coated glass sheet and application of biological solar cells

[0059] 1. Preparation of oil-soluble CdSe nanoparticles by high temperature oil phase method

[0060] Mix 2g of trioctylphosphine oxide, 2.8g of dodecylamine, 0.3g of tetradecyl phosphoric acid, and 0.05g of cadmium oxide in a three-necked flask, stir magnetically, vacuumize, protect with inert gas, and heat to 300°C , reacted for 6 hours, added 1 mL of selenium trioctylphosphine solution, reacted for 15 minutes, stopped heating to obtain oil-soluble CdSe nanoparticles with a particle size of 5 nm, and centrifuged to obtain oil-soluble CdSe nanoparticles with a uniform particle size;

[0061] 2. Preparation of water-soluble CdSe nanoparticles by ligand displacement method

[0062] Take the oil-soluble CdSe nanoparticles prepared in step 1, add 4 mL of n-hexane, the concentration of CdSe nanoparticles is 5×10 -3 m...

Embodiment 2

[0071] Example 2 Preparation method of CdTe nanoparticle self-assembled film on the surface of glass sheet with silver-coated gold double metal layer and application of kinetic detection chip based on surface plasmon resonance imaging

[0072] 1. Surface modification of water-soluble CdTe nanoparticles

[0073] After the water-soluble CdTe nanoparticles with carboxy-terminus were prepared from the partner National Center for Nanoscience and Technology, 4 mL of phosphate buffer solution at pH 5.7 was added to obtain a concentration of 2.5 × 10 -3 mol / L water-soluble CdTe nanoparticles, add 1 mL of 0.2 mol / LEDC solution and 0.05 mol / L NHS solution, react for 60 minutes, and centrifuge to obtain water-soluble CdTe nanoparticles with activated carboxyl groups. for 10 -2 mol / L NTA aqueous solution 2mL, react for 2h, add 6×10 -2 mol / LNiSO 4 Alkaline solution 1mL, centrifuged to obtain surface-modified NTA and Ni 2+ CdTe nanoparticles;

[0074] 2. Modification of the surface o...

Embodiment 3

[0081] Example 3 Preparation method of CdSe / ZnS nanoparticle self-assembled film on gold-coated glass surface and application of biomolecular interaction chip based on surface fluorescence enhancement

[0082] 1. Surface modification of water-soluble CdSe / ZnS nanoparticles

[0083] Add water-soluble CdSe / ZnS nanoparticles with carboxyl terminals (purchased from the National Nanoscience Center) to 2 mL of phosphate buffer solution with a pH of 5.7 to obtain a concentration of 5 × 10 -3 mol / L water-soluble CdSe / ZnS nanoparticles, adding concentration of 0.2mol / LEDC solution and concentration of 0.05mol / LNHS solution 1mL, reacted for 60min, centrifuged to obtain activated carboxyl water-soluble CdSe / ZnS nanoparticles, the Nanoparticles were added at a concentration of 10 -2 mol / L NTA aqueous solution 4mL, react for 3h, add 1×10 -2 mol / LNi 2 Cl alkaline solution 1mL, centrifuged to obtain surface-modified NTA and Ni 2+CdSe / ZnS nanoparticles;

[0084] 2. Modification of the ...

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Abstract

The present invention provides a preparation method of a quantum dot self-assembled film by use of Ni-NTA effect, the method is as follows: modifying surface of a deposited metal layer substrate with carboxyl groups; modifying surface of water-soluble quantum dots with nitrilotriacetic acid and divalent nickel ions; and immersing the deposited metal layer substrate modified with the carboxyl groups into a solution of the quantum dots modified with the nitrilotriacetic acid and the divalent nickel ions for assembling of the quantum dots onto the deposited metal layer substrate under vacuum conditions. The present invention also provides a material comprising the deposited metal layer substrate and the self-assembled film prepared by the method. The present invention further provides application of the self-assembled film in the field of optoelectronic materials, biological materials, and the like. The preparation method is simple in operation, time-saving and good in controllability, and the prepared quantum-dot-nanoparticle self-assembled film has good film formation property and stable nature, and is widely used in the field of the optoelectronic materials, biological materials, and the like.

Description

technical field [0001] The invention belongs to the field of nanomaterial preparation technology and nanomaterial assembly. Specifically, the invention relates to a method for preparing a quantum dot self-assembled film by utilizing the Ni-NTA action, including the material of the self-assembled film and the self-assembled film. application. Background technique [0002] According to relevant literature and patent reports, quantum dots (QD), that is, semiconductor nanoparticles, have excellent optical properties, such as wide absorption, narrow emission with adjustable size and high quantum yield, etc., and are excellent fluorescence resonance energy transfer and electronic The transferred donor is also expected to be used to develop a new generation of solar cells and new optoelectronic smart materials. [0003] Because CdSe nanoparticles have excellent optical properties and good stability, they are widely used in solar cells, optical materials, biomarkers, etc. At the sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/00G01N21/552G01N21/64B81C1/00
Inventor 朱劲松程志强吴侠杨鑫周文菲杨墨
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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