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Preparation method and application of carbon dot/gold composite nanoparticles

A technology of composite nanoparticles and carbon dots, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of low quantum yield of composite nanoparticles, large particle size of composite nanoparticles, limited heterogeneous nucleation, etc. The preparation process is simple and feasible, the quantum yield is high, and the reaction conditions are green and environmentally friendly.

Active Publication Date: 2016-11-23
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the quantum yield of the as-prepared composite nanoparticles is much lower than that of the carbon dots themselves
In addition, because the reducing agent and the stabilizer are different substances, and the force between the carbon dots and the gold particles is weak, and the heterogeneous nucleation is limited, it is difficult to inhibit the transformation of the high surface energy gold nanoclusters into gold nanoparticles. resulting in large and dispersed composite nanoparticles

Method used

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  • Preparation method and application of carbon dot/gold composite nanoparticles
  • Preparation method and application of carbon dot/gold composite nanoparticles
  • Preparation method and application of carbon dot/gold composite nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Example 1: Preparation of carbon dots

[0049] Weigh 2.0g citric acid monohydrate and 1.0g L-cysteine, add 10.0mL deionized water, stir until uniformly mixed; transfer the above mixed solution to a hydrothermal reaction kettle, and react in a muffle furnace at 200°C After 3h, it was naturally cooled to room temperature to obtain a brownish-yellow carbon dot solution. The obtained carbon dot solution was centrifuged at 5000r / min, the supernatant was taken, dialyzed with a dialysis bag (molecular weight cut-off of 3000Da) for 48h, evaporated and dried to obtain purified solid carbon dots, and refrigerated for future use.

[0050] Depend on figure 1 a TEM image of carbon dots and figure 2 a The particle size distribution diagram shows that the particle size of most carbon dots is 1-2.5nm, which is smaller than the 7nm particle size reported in the literature, and the particle size distribution is quite uniform and in a monodisperse state. image 3 a is the UV-visible...

Embodiment 2

[0052] Embodiment 2: Preparation of Cdot-Au

[0053] 1. Preparation of raw carbon dots

[0054] The preparation method of carbon dots in this example is as shown in Example 1.

[0055] 2. Preparation and characterization of Cdot-Au

[0056] Prepare a chloroauric acid solution with a concentration of 100 μg / mL, take 5 mL, and slowly add it dropwise to 5 mL of a certain concentration of carbon dot solution to ensure that the mass ratio of carbon dots to chloroauric acid is 3:1. Slowly stir the reaction for 3 hours, then dialyze with a dialysis bag with a molecular weight cut-off of 1000-5000Da for 12-48 hours to obtain an aqueous solution of Cdot-Au nanocomposite particles, and obtain solid Cdot-Au nanocomposite particles after evaporation and drying.

[0057] The morphology of Cdot-Au, and the comparison with the structure and properties of carbon dots are as follows:

[0058] Cdot-Au described in the present invention is the particle of about 1~3nm under transmission elec...

Embodiment 3

[0066] Embodiment 3: to the regulation and control of Cdot-Au performance

[0067] 1. Preparation of raw carbon dots

[0068] The preparation method of carbon dots in this example is as shown in Example 1.

[0069] 2. The amount of carbon dots can control the performance of Cdot-Au

[0070] The effect of the amount of carbon dots on the particle size and optical properties of Cdot-Au was investigated by adjusting the amount ratio of carbon dots and chloroauric acid. like figure 1 b tofigure 1 f and 2b to figure 2 As shown in f, under the condition of maintaining the concentration of chloroauric acid at 50 μg / mL, when the mass ratio of carbon dots to chloroauric acid is 0.2:1 and 0.4:1, the particle diameter of the composite nanoparticles is about 35nm; when increased to 2 When : 1, obtain the nanoparticle of two kinds of size distributions, wherein particle size is bigger about 9nm, and smaller is about 2nm; When it is further increased to 4:1, the particle size is les...

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Abstract

The invention discloses a preparation method and application of carbon dot / gold composite nanoparticles. Citric acid and cysteine are taken as raw materials, and N-S codoping carbon dots are synthesized; the carbon dots serve as the heterogeneous nucleation center of the gold nanoparticles, a reducing agent and a stabilizing agent, any other auxiliaries such as a surface active agent or an adsorbent do not need to be added, and the carbon dot / gold composite nanoparticles are prepared by further reducing chloroauric acid. The preparation method of the carbon dot / gold composite nanoparticles is simple, convenient, feasible, mild in reaction condition and environmentally friendly, and the prepared carbon dot / gold composite nanoparticles have the characteristics of being high in quantum yield, small in size, low in biotoxicity, resistant to photobleaching and the like, and can be applied to the fields such as cell imaging or catalytic reaction research.

Description

technical field [0001] The invention relates to the preparation and application of composite nanomaterials of carbon and precious metals, in particular to a preparation method and application of a small-sized carbon dot / gold (Cdot-Au) composite nanoparticle with high quantum yield. Background technique [0002] Composite nanomaterials integrate nanomaterials with different functions to construct nanoparticles with multiple functions and achieve application goals that cannot be achieved by a single nanoparticle. It is one of the important directions for the development of nanomaterials. On the one hand, carbon dots are a new class of carbon nanomaterials developed in recent years. They have attracted much attention due to their high fluorescence intensity, resistance to photobleaching, no light flickering, good biocompatibility, and easy modification. On the other hand, metal nanoparticles have special photoelectric properties, such as photocatalysis, photothermal effect, sur...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/00C09K11/65
Inventor 郭新秋童刚生王景霞王戈何琳朱新远
Owner SHANGHAI JIAO TONG UNIV
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