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Preparation method of gold nucleus-quantum dot satellite structure assembly

A satellite structure and quantum dot technology, applied in the field of analytical chemistry, can solve problems such as hindering sensing applications, low assembly yield, and difficulty in assembly of quantum dots, achieving high yield and solving assembly difficulties.

Active Publication Date: 2015-11-11
JIANGNAN UNIV
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  • Abstract
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Problems solved by technology

However, at present, the assembly of quantum dots is very difficult, resulting in low assembly yield, which hinders its application in sensing.

Method used

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  • Preparation method of gold nucleus-quantum dot satellite structure assembly

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Embodiment 1

[0020] Embodiment 1 The high-yield assembly of gold core-quantum dot satellite structure

[0021] (1) Synthesis of gold nanoparticles with a particle size of 35nm

[0022] Gold nanoparticles with a diameter of 35nm were synthesized by seed growth method.

[0023] Gold seeds with a particle size of 13nm were synthesized by reducing chloroauric acid with trisodium citrate: the Erlenmeyer flask used for the reaction was soaked in freshly prepared aqua regia for 24 hours in advance, rinsed with ultrapure water until clean, and dried at 37°C for later use. Add 2mL of 10mM chloroauric acid and 38mL of ultrapure water into a clean Erlenmeyer flask, heat to boiling, add 2mL of 38.8mM trisodium citrate, and boil for 20min to obtain gold seeds with a particle size of 13nm.

[0024] Synthesis of gold nanoparticles with a particle size of 35nm: add 2mL10mM chloroauric acid, 0.1mL10mM silver nitrate, 42.5mL ultrapure water, 2mL13nm gold seeds in a conical flask, add 7.5mL5.3mM The ascorb...

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Abstract

The invention discloses a preparation method of a gold nucleus-quantum dot satellite structure assembly, belonging to the technical field of analytical chemistry. A high-yield assembly method of a gold nucleus-quantum dot satellite structure comprises the following steps of synthesis of gold nano particles with the particle size of 35nm, preparation of quantum dots with the particle size of 7nm, DNA-1 modification on the gold nano particles, complementary sequence DNA-2 modification on the quantum dots, assembling of the gold nucleus-quantum dot satellite structure, and purification of the gold nucleus-quantum dot satellite structure. By adopting the preparation method, the problems that quantum dot assembling is difficult and the yield is low are solved, and a way is paved for developing a fluorescence sensor based on quantum dot assembling.

Description

technical field [0001] The invention relates to a high-yield assembly method of a gold core-quantum dot satellite structure, belonging to the technical field of analytical chemistry. Background technique [0002] Quantum dots (QuantumDots, QDs) are nanoparticles composed of II-VI or III-V elements. The particle size of quantum dots is generally between 1 and 10 nm. Since electrons and holes are quantum-confined, the continuous energy band structure becomes a discrete energy level structure with molecular characteristics, and can emit fluorescence after being excited. Compared with traditional fluorescent dyes, QDs have broad excitation, narrow emission and high fluorescence quantum yield. QDs have gradually replaced dyes as a new type of biomarker material, and are widely used in cell imaging, immunofluorescence, in vivo imaging, and nucleic acid recognition. [0003] Gold nanoparticles have good biocompatibility and large specific surface area. Utilizing its quenching ef...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B82B3/00C09K11/88B22F9/24B22F1/02G01N21/64C12Q1/02C12Q1/68A61B5/00B82Y15/00B82Y40/00
Inventor 匡华赵雪利胥传来徐丽广马伟刘丽强吴晓玲宋珊珊胡拥明
Owner JIANGNAN UNIV
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