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A method for preparing nano-gold assisted by imidazolium cation-modified carbon quantum dots

A technology of carbon quantum dots and nano-gold, which is applied in the field of imidazolium cation-modified carbon quantum dots to assist in the preparation of nano-gold, can solve the problems of negatively charged carbon quantum dots and poor biocompatibility of cationic surfactants, and achieves rich variety, Environmentally friendly, overcoming toxic effects

Active Publication Date: 2021-05-04
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problem that the cationic surfactant used in the synthesis of gold nanocrystals has poor biocompatibility, and the carbon quantum dots are negatively charged and cannot be used for the synthesis of nano-gold, the invention provides a kind of imidazolium cation-modified carbon quantum dots to assist in the preparation of nano-gold Methods

Method used

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  • A method for preparing nano-gold assisted by imidazolium cation-modified carbon quantum dots
  • A method for preparing nano-gold assisted by imidazolium cation-modified carbon quantum dots
  • A method for preparing nano-gold assisted by imidazolium cation-modified carbon quantum dots

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Seed crystal configuration: configure 2.5 mL 0.2 mg×mL -1 Carbon quantum dot aqueous solution, add 83 μL 0.01mol×L -1 Chlorauric acid (HAuCl 4 ) solution, then add 200 μL 0.01 mol×L -1 Freshly prepared sodium borohydride (NaBH 4 ) solution. Freshly prepared seeds were used after 2 h.

[0028] Growth medium configuration: configure 2.5 mL 0.4 mg×mL -1 carbon quantum dot aqueous solution, add 1 mL0.001 mol×L -1 HAuCl 4 solution. Take 0.6 mL of the prepared growth solution above and put them into the three vials A, B, and C respectively. Add 40 μL of 0.1 mol×L to the three vials respectively -1 of ascorbic acid. Add 5 µL of concentrated HNO to C 3 .

[0029] Add 40 μL of seed crystals to A, shake for 10 s, take 40 μL of solution from A and add to B, shake for 10 s, then take 40 μL of solution from B and add to C, shake for 10 s. Let stand for 12 h.

Embodiment 2

[0031] On the basis of Example 1, will add concentrated HNO 3 Change the volume to 15 μL.

Embodiment 3

[0033] On the basis of Example 1, will add concentrated HNO 3 Change the volume to 25 μL.

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Abstract

The invention discloses a method for assisting preparation of nano-gold by imidazolium cation-modified carbon quantum dots. The present invention utilizes imidazolium cation-modified carbon quantum dots prepared by pyrolyzing citric acid and aminoimidazolium bromide instead of cationic surfactants, and prepares a series of nano gold by a seed growth method. The invention overcomes the disadvantage of high toxicity of cationic surfactants, is low in cost, and is environmentally friendly, expands the application field of carbon quantum dots, and enriches the types of coating agents required for the controllable synthesis of nano gold.

Description

technical field [0001] The invention relates to a method for assisting preparation of nano-gold by imidazolium cation-modified carbon quantum dots, which belongs to the field of new materials. Background technique [0002] The synthesis of gold nanostructures with controllable morphology mostly requires surfactants as capping agents to precisely control the nucleation and growth of gold nanocrystals. The interaction between surfactants and gold can affect the kinetic growth process of gold nanocrystals. Some surfactants even act as templates to affect the growth of gold nanocrystals. At present, cationic surfactants are the most widely used, especially quaternary ammonium salt cationic surfactants. This is because there is a large amount of negative charge around the gold nanoparticle and it is easy to generate strong electrostatic interaction with the cationic head group (M. Grzelczak, J. Perez-Juste, P.Mulvaney and L. M. Liz-Marzan, Chem. Soc. Rev ., 2008, 37, 1783-1791...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/00B82Y40/00
CPCB82Y40/00B22F9/24B22F1/0553B22F1/054
Inventor 李洪光孙晓峰
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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