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Carbon quantum dot co-doped by silicon and nitrogen and preparation method and application thereof

A technology of carbon quantum dots and co-doping, applied in chemical instruments and methods, measuring devices, nanotechnology, etc., can solve the problems of complex synthesis steps, inconvenient Fe3+ detection, etc., and achieve good biocompatibility and good optical stability , the effect of rich carbon source

Inactive Publication Date: 2020-03-31
BEIBU GULF UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods usually rely on expensive and complex-operated instruments and require skilled operators, which gives Fe 3+ Detection brings a lot of inconvenience
For the detection of Fe by traditional fluorescence method 3+ , requiring complex synthetic steps based on small organic molecules, some of which are prone to photobleaching

Method used

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  • Carbon quantum dot co-doped by silicon and nitrogen and preparation method and application thereof
  • Carbon quantum dot co-doped by silicon and nitrogen and preparation method and application thereof
  • Carbon quantum dot co-doped by silicon and nitrogen and preparation method and application thereof

Examples

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Embodiment 1

[0045] A method for preparing silicon and nitrogen co-doped carbon quantum dots, comprising the following preparation steps:

[0046] S1. Put citric acid and 3-aminopropyltrimethoxysilane with a volume ratio of 25ml:0.5ml in a glass container, mix with water, stir thoroughly, and ultrasonically obtain a clear solution, wherein the citric acid The mass concentration is 60g / L;

[0047] S2, reacting the clear solution obtained in S1 at 180° C. for 14 hours, stirring and reacting to obtain a reaction solution;

[0048]S3, cooling the reaction liquid in S2 to 25° C., suction filtering, centrifuging, filtering with a filter membrane, taking the filtrate to adjust the pH value, and dialysis to obtain a dialysate;

[0049] S4, concentrating and drying the dialysate to obtain silicon and nitrogen co-doped carbon quantum dots.

Embodiment 2

[0051] A method for preparing silicon and nitrogen co-doped carbon quantum dots, comprising the following preparation steps:

[0052] S1. Put citric acid and 3-aminopropyltrimethoxysilane with a volume ratio of 25ml:0.4ml in a glass container, mix with water, stir thoroughly, and ultrasonically obtain a clear solution, wherein the citric acid The mass concentration is 60g / L;

[0053] S2, reacting the clear solution obtained in S1 at 180° C. for 14 hours, stirring and reacting to obtain a reaction solution;

[0054] S3, cooling the reaction liquid in S2 to 25° C., suction filtering, centrifuging, filtering with a filter membrane, taking the filtrate to adjust the pH value, and dialysis to obtain a dialysate;

[0055] S4, concentrating and drying the dialysate to obtain silicon and nitrogen co-doped carbon quantum dots.

Embodiment 3

[0057] A method for preparing silicon and nitrogen co-doped carbon quantum dots, comprising the following preparation steps:

[0058] S1, put citric acid and 3-aminopropyltrimethoxysilane with a volume ratio of 25ml:0.3ml in a glass container, mix with water, stir thoroughly, and ultrasonically obtain a clear solution, wherein the citric acid The mass concentration is 60g / L;

[0059] S2, reacting the clear solution obtained in S1 at 180° C. for 14 hours, stirring and reacting to obtain a reaction solution;

[0060] S3, cooling the reaction liquid in S2 to 25° C., suction filtering, centrifuging, filtering with a filter membrane, taking the filtrate to adjust the pH value, and dialysis to obtain a dialysate;

[0061] S4, concentrating and drying the dialysate to obtain silicon and nitrogen co-doped carbon quantum dots.

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Abstract

The invention discloses a carbon quantum dot co-doped by silicon and nitrogen, and a preparation method and application thereof. The preparation method comprises the following steps: S1, mixing citricacid and 3-aminopropyltrimethoxysilane in a volume ratio of 25 ml: (0.1-0.5) ml with water, and carrying out stirring and ultrasonic treatment to obtain a clear solution, wherein the mass concentration of the citric acid is 60g / L; S2, subjecting the clear solution to a reaction to obtain a reaction solution; S3, cooling the reaction solution to 25 DEG C, carrying out suction filtration and centrifuging, performing filtering by using a filter membrane, taking a filtrate, adjusting the pH value of the filtrate, and carrying out dialyzing to obtain a dialysate; and S4, concentrating and drying the dialysate to obtain the carbon quantum dot co-doped by silicon and nitrogen. According to the preparation method, raw materials are easy to obtain; and the prepared carbon quantum dot co-doped by silicon and nitrogen is high in quantum yield, good in optical stability and stable in fluorescence. The prepared carbon quantum dot co-doped by silicon and nitrogen is applied to fluorescence analysisand used for detecting the content of Fe<3+> in an environment, and has a wide detection range.

Description

technical field [0001] The invention relates to carbon quantum dots, in particular to a silicon and nitrogen co-doped carbon quantum dot and its preparation method and application. Background technique [0002] As a new type of luminescent nanomaterial, carbon quantum dots have the advantages of low cytotoxicity and good biocompatibility compared with traditional semiconductor quantum dots and organic dyes, and have adjustable luminescence range, large two-photon absorption cross-section, Fluorescence has the advantages of high quantum yield, good photobleaching resistance, no light flicker, easy functionalization, cheap and easy to obtain, etc. It has shown great promise in the medical field, especially in the dynamic tracking of cells and living bodies and biological imaging applications. The potential has been widely concerned by researchers. As a zero-dimensional nanomaterial, carbon quantum dots have superior properties such as quantum confinement effects, surface effe...

Claims

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Application Information

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IPC IPC(8): C09K11/65B82Y20/00B82Y40/00G01N21/64
CPCB82Y20/00B82Y40/00C09K11/65G01N21/6428G01N21/643G01N2021/6419G01N2021/6432
Inventor 王芸付国胡晓熙文丰张艳军莫小荣尹艳镇
Owner BEIBU GULF UNIV
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