Bio-based carbon nano dot fluorescent powder, preparation method and applications thereof

A bio-based carbon and carbon nanodot technology, applied in the field of nanomaterials, can solve the problems of low luminous quantum efficiency and intractability

Active Publication Date: 2015-01-07
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a bio-based car

Method used

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  • Bio-based carbon nano dot fluorescent powder, preparation method and applications thereof
  • Bio-based carbon nano dot fluorescent powder, preparation method and applications thereof
  • Bio-based carbon nano dot fluorescent powder, preparation method and applications thereof

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preparation example Construction

[0044] The present invention also provides a preparation method of the above-mentioned bio-based carbon nano-dot fluorescent powder, comprising the following steps:

[0045] ① Mix and dissolve carbon nanodots and biological product powder in water, and keep stirring to obtain a reaction mixture;

[0046] ② The reaction mixture obtained in ① is filtered, freeze-dried, ground, and screened to obtain bio-based carbon nano-dot phosphors.

[0047] The mass ratio of carbon nanodots and biological product powder in the present invention is preferably 1:(20-450), the stirring temperature is preferably room temperature, and the stirring time is preferably 12-24 hours.

[0048] The purpose of filtering the reaction mixture in the present invention is to separate the carbon nano-dots that are not adsorbed on the surface of the starch granules. The freeze-drying is preferably carried out in a vacuum freeze-drying machine, and the freeze-drying temperature is preferably -45~-55°C. The fre...

Embodiment 1

[0055] Dissolving the carbon nano-dots and starch emitting green light in water at a mass ratio of 1:20, and continuously stirring at room temperature for 24 hours to obtain a reaction mixture;

[0056] Filter the above reaction mixture through qualitative filter paper to separate the carbon nano-dots that are not adsorbed on the surface of the starch granules to obtain the filtrate, freeze-dry the filtrate through a vacuum freeze dryer at minus 50 degrees for 24 hours, and then fully grind into powder, and screened through a 400-mesh fine sieve to obtain bio-based carbon nano-dot fluorescent powder with uniform particle size.

[0057] figure 1 It is a schematic diagram of the preparation method of bio-based carbon nano-dot fluorescent powder in Example 1 of the present invention. The selected biological product powder is starch. It can be adsorbed on the surface of starch granules through hydrogen bonds to achieve effective dispersion and efficient luminescence of carbon nan...

Embodiment 2

[0059] Dissolving the carbon nano-dots and starch emitting green light in water at a mass ratio of 1:45, and continuously stirring at room temperature for 24 hours to obtain a reaction mixture;

[0060] Filter the above reaction mixture through qualitative filter paper to separate the carbon nano-dots that are not adsorbed on the surface of the starch granules to obtain the filtrate, freeze-dry the filtrate through a vacuum freeze dryer at minus 50 degrees for 24 hours, and then fully grind into powder, and screened through a 400-mesh fine sieve to obtain bio-based carbon nano-dot fluorescent powder with uniform particle size.

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Abstract

The invention provides bio-based carbon nano dot fluorescent powder, a preparation method and applications thereof, belongs to the scientific field of nano materials, and aims to solve the problems that in the prior art the luminescent quantum efficient of conventional carbon nano dot based luminescent materials is low and the luminescent materials are difficult to process. The bio-based carbon nano dot fluorescent powder takes the carbon nano dots as the central luminescent materials; biological products such as starch, agar powder, and the like are taken as the dispersing medium; the carbon nano dots are evenly bonded to the selected particle surfaces of the biological product powder through hydrogen bonds, thus the carbon nano dots are highly dispersed in space, the solid-state luminescence quenching caused by conglomeration is effectively avoided, and the high efficient luminescence of carbon nano dots in a solid-state system is achieved. The invention further provides a preparation method of the bio-based carbon nano dot fluorescent powder, and the provided fluorescent powder can be applied to the industries such as temperature sensor, illumination and display, fluorescent paint, and the like.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and in particular relates to a bio-based carbon nano-dot fluorescent powder and a preparation method and application thereof. Background technique [0002] Due to their good water solubility, stability, low toxicity, photobleaching resistance and good biocompatibility, carbon nanodots are expected to replace organic dyes and heavy metal-containing semiconductor quantum dots in biological imaging and sensing, fluorescent pattern construction, Coding and applications in optoelectronic devices. Various methods such as laser ablation, electrochemical oxidation, hydrothermal and microwave have been used to prepare carbon nanodots. High luminous quantum efficiency is the key to optimize the performance of carbon nanodots and expand their application fields. So far, the quantum efficiency of carbon nanodots in aqueous solution has reached more than 60%, which is comparable to commercial CdSe / ZnS...

Claims

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Application Information

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IPC IPC(8): C09K11/65H01L33/50C09D5/22
CPCY02B20/00
Inventor 曲松楠孙明烨
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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