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Graphene and rare earth up-conversion fluorescent composite material and preparation method thereof

A technology of rare earth up-conversion and composite materials, which is applied in the field of preparation of graphene and rare earth up-conversion fluorescent composite materials. It can solve problems such as solutions or routes that have not been reported, and achieve stable reaction conditions, broad application prospects, and simple processes.

Inactive Publication Date: 2013-03-06
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In summary, the systematic study of graphene-phosphor composites functionalized with different classes of rare earth upconversion fluorescent materials has not been reported. In addition, it is possible to prepare graphene-rare earth upconversion fluorescent composites with good upconversion fluorescence properties. The scheme or route of the

Method used

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  • Graphene and rare earth up-conversion fluorescent composite material and preparation method thereof
  • Graphene and rare earth up-conversion fluorescent composite material and preparation method thereof
  • Graphene and rare earth up-conversion fluorescent composite material and preparation method thereof

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specific Embodiment approach ( 1

[0021] Graphite oxide was prepared by the Hummer method using graphite powder as the raw material for the next step of compounding and as a comparison material. 5.9mg of graphite oxide was ultrasonically dispersed in 60mL of water, and the total molar mass was 0.05mmol of Y(NO 3 ), Yb(NO 3 ) and Er(NO 3 ) was added to the above-mentioned graphite oxide dispersion in a stoichiometric ratio of 78:20:2. Add 0.025g NaF, stir for 10min, transfer to a 100mL reactor, and react at 200°C for 24h. Naturally cool to room temperature, centrifuge and wash twice with deionized water to obtain graphene and phosphor YF 3 : Composites of Yb, Tm, denoted as graphene-YF 3 :Yb,Er, where "-" means functionalization, ":" means doping, "α" means α phase.

specific Embodiment approach ( 2

[0022] 5.9mg of graphite oxide was ultrasonically dispersed in 60mL of water, and the total molar mass was 0.05mmol of Y(NO 3 ), Yb(NO 3 ) and Er(NO 3) was added to the above-mentioned graphite oxide dispersion in a stoichiometric ratio of 78:20:2. Add 0.108g NaF, stir for 10min, then transfer to a 100mL reactor, and react at 200°C for 24h. Naturally cooled to room temperature, centrifuged and washed twice with deionized water, then graphene and phosphor α-phase NaYF were obtained 4 : Composites of Yb, Er, expressed as graphene-(α)NaYF 4 : Yb, Er.

specific Embodiment approach ( 3

[0023] 75mg of graphite oxide was ultrasonically dispersed in 24mL of water, and a total molar mass of 1mmol of Y(NO 3 ), Yb(NO 3 ) and Er(NO 3 ) was added to the above-mentioned graphite oxide dispersion in a stoichiometric ratio of 78:20:2. Add 0.8823g of sodium citrate, stir for 5min, then add 24mL of ethanol, and add dropwise 24mL of a solution of 0.42g of NaF in water and ethanol (volume ratio: 1) under vigorous stirring. Adjust the pH value to 3, transfer to a 100mL reactor, and react at 240°C for 4h. Obtaining graphene and β-phase NaYF 4 : Composites of Yb, Er phosphors, expressed as graphene-(β)NaYF 4 : Yb, Er.

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Abstract

The invention provides a graphene and rare earth up-conversion fluorescent composite material and a preparation method thereof. The method comprises the steps of: using a graphite powder as a raw material to prepare graphite oxide by a Hummer method; conducting ultrasonic dispersion on 5-85mg of graphite oxide into 24-60mL of water; then adding Y (NO3), Yb (NO3) and Er (NO3) in a total molar weight of 0.05-1mmol by a stoichiometric ration of 78:20:2 into the graphite oxide dispersion; adding 0.02-0.5g of NaF and stirring for 5-10min; transferring the mixture to a 100mL reactor; reacting for 4-24h at 200-240 DEG C; naturally cooling to room temperature; centrifuging for separation and washing the reaction product with deionized water twice to obtain a graphene and yttrium fluoride up-conversion fluorescent powder composite material, which comprises a mixture of two or three selected from the followings: graphene-YF3:Yb, Er; graphene-(alpha) NaYF4:Yb, Er; and graphene-(beta) NaYF4:Yb, Er. The method provided by the invention is simple, employs non-toxic raw materials, and can change type of the earth up-conversion fluorescent material and up-conversion fluorescence properties of a final composite material by simply adjusting conditions of a hydrothermal reaction.

Description

technical field [0001] The invention relates to a graphene and rare earth up-conversion fluorescent composite material. The invention also relates to a preparation method of graphene and rare earth up-conversion fluorescent composite material. Background technique [0002] Graphene has sp 2 A hybrid single-layer carbon atom structure, thus possessing advanced mechanical, optical, and electrical properties. Since its discovery in 2004, it has been a research hotspot in the field of materials and biotechnology, especially in exploring the application value of graphene in the fields of physics, chemistry and biology. At present, the research of graphene in nanoelectronics, nanosensors and nanocomposites has made important progress. However, how to further optimize graphene to meet its application in wider fields is still the highest concern of researchers. [0003] The quickest and most practical way to optimize graphene is to combine graphene with other materials to prepar...

Claims

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Application Information

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IPC IPC(8): C09K11/85
Inventor 杨飘萍盖世丽张圣欢吕锐婵牛娜贺飞
Owner HARBIN ENG UNIV
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