Near-infrared silver-gold-selenium fluorescent quantum dot as well as preparation method and application thereof

A fluorescent quantum dot and near-infrared technology, applied in the field of material science, can solve the problems of low absolute fluorescence quantum yield, difficulty in balancing fluorescence intensity and toxicity, and achieve superior photostability, easy reaction scale, and simple and easy reagents The effect

Active Publication Date: 2022-08-05
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Application Information

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Problems solved by technology

However, the existing infrared fluorescent quantum dots, such as lead sulfide, cadmium telluride, lead selenide, mercury telluride, silver selenide, etc., have low absolute fluorescence quantum yields, and some of them contain toxic heavy metal elements. Toxicity can't have both

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  • Near-infrared silver-gold-selenium fluorescent quantum dot as well as preparation method and application thereof
  • Near-infrared silver-gold-selenium fluorescent quantum dot as well as preparation method and application thereof
  • Near-infrared silver-gold-selenium fluorescent quantum dot as well as preparation method and application thereof

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preparation example Construction

[0026] As an aspect of the technical solution of the present invention, it relates to a method for preparing near-infrared silver-gold-selenium fluorescent quantum dots, comprising:

[0027] performing a solvothermal reaction in the first uniform mixing reaction system comprising a silver source, a selenium source and a weakly polar solvent to prepare a silver selenide quantum dot precursor;

[0028] The second uniform mixing reaction system comprising the silver selenide quantum dot precursor and the gold source is subjected to a cation exchange reaction at 0-200° C. for 10-72 hours to obtain near-infrared silver-gold-selenium fluorescent quantum dots.

[0029] In some embodiments, the preparation method mainly includes: uniformly mixing a silver source and a selenium source in a weak polar solvent and performing a solvothermal reaction to prepare silver selenide quantum dots; It is mixed with gold source and reacted with cation exchange at room temperature to obtain near-inf...

Embodiment 1

[0065] Dissolve 0.06g of silver nitrate in 20mL of oleylamine, disperse it uniformly by ultrasonic, then add 0.06g of selenium powder, and react at 200°C for 5h to obtain a precursor of silver selenide quantum dots (0.6g), then add 0.06g of chloroauric acid, 100 The near-infrared silver-gold-selenium fluorescent quantum dots can be obtained by reacting at ℃ for 48h.

[0066] from Figure 1a-Figure 1b It can be seen that the near-infrared silver-gold-selenium fluorescent quantum dot products obtained in this example have uniform morphology and size, and the size is about 4.8 nm, wherein Figure 1a is a transmission electron microscope photograph of near-infrared silver-gold-selenium fluorescent quantum dots, Figure 1b is a high-resolution transmission electron microscope photograph. see again figure 2 and image 3 , it can be known from powder X-ray diffraction and energy dispersive X-ray spectrum that the nanoparticle material is a silver-gold-selenium compound.

[0067]...

Embodiment 2

[0069] Dissolve 0.06g of silver carbonate in 20mL of octanethiol, disperse it uniformly by ultrasonic, then add 0.8g of selenium dioxide, and react at 250°C for 2h to obtain a precursor of silver selenide quantum dots (0.05g), and then add 0.5g of gold nitrate 200 The near-infrared silver-gold-selenium fluorescent quantum dots can be obtained by reacting at ℃ for 10h.

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Abstract

The invention discloses a near-infrared silver-gold-selenium fluorescent quantum dot as well as a preparation method and application thereof. The preparation method comprises the following steps: carrying out solvothermal reaction on a first uniformly mixed reaction system containing a silver source, a selenium source and a weak polar solvent to prepare a silver selenide quantum dot precursor; and carrying out cation exchange reaction on the second uniformly mixed reaction system containing the silver selenide quantum dot precursor and a gold source at 0-200 DEG C for 10-72 hours to obtain the near-infrared silver-gold-selenium fluorescent quantum dot with the fluorescence emission peak wavelength of 800-1350 nm. The silver selenide quantum dots are prepared through a simple high-temperature solvothermal method, then the silver-gold-selenium quantum dots are obtained through a cation exchange method, the synthesis process is simple and controllable, the yield is high, large-scale preparation can be achieved, meanwhile, the obtained product is uniform in size, fluorescence emission is located in near infrared, high quantum efficiency and excellent light stability are achieved, and the silver-gold-selenium quantum dots are suitable for large-scale preparation. Wide application prospects are realized in the fields of biological imaging, near-infrared devices and the like.

Description

technical field [0001] The invention relates to a near-infrared fluorescent quantum dot and a preparation method thereof, in particular to a near-infrared silver-gold-selenium fluorescent quantum dot with high quantum efficiency, a preparation method and application thereof, and belongs to the field of material science. Background technique [0002] Fluorescence imaging technology has the advantages of non-contact, intuitive image, real-time, high sensitivity, economical and convenient, and no radiation hazard. According to the wavelength range of fluorescence imaging, it mainly includes visible light fluorescence imaging (400-650 nm) and near-infrared fluorescence imaging (650-1700 nm). In biological imaging, near-infrared light can be divided into two optical windows: near-infrared I region (650-900nm, NIR-I) and near-infrared (900-1700nm, NIR-II). NIR-fluorescence is a new fluorescence window discovered in in vivo fluorescence imaging research in the last decade. Compare...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/88B82Y20/00B82Y40/00H01L33/50
CPCC09K11/881B82Y20/00B82Y40/00H01L33/504Y02P70/50
Inventor 王强斌杨红超
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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