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Method for preparing graphene fluorescent quantum dots by electrochemical pulse

A technology of fluorescent quantum dots and graphene, applied in fluorescence/phosphorescence, material excitation analysis, etc., can solve the problems of time-consuming and energy-consuming, cumbersome preparation process, etc., and achieve the advantages of convenient operation, simple process, wide practical value and industrial prospect. Effect

Active Publication Date: 2018-08-21
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, these methods are relatively time-consuming and energy-consuming, and the preparation process is cumbersome.

Method used

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  • Method for preparing graphene fluorescent quantum dots by electrochemical pulse
  • Method for preparing graphene fluorescent quantum dots by electrochemical pulse
  • Method for preparing graphene fluorescent quantum dots by electrochemical pulse

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Step 1. Use a graphite rod as a working electrode, a platinum sheet as a counter electrode, and connect a saturated calomel reference electrode to form a three-electrode system, and add a KOH solution with a concentration of about 6M as an electrolyte;

[0035] Step 2. Use the electrochemical pulse method for stripping. The experimental parameters are designed to be 100s at a constant potential of positive potential 3V, and 100s at a negative potential of -3V. This reciprocating cycle is about 6h;

[0036] Step 3, centrifuging the black solution obtained in step 2 at a speed of 5000 rpm, discarding the lower graphite powder, and retaining the supernatant;

[0037] Step 4, dialyze the supernatant obtained in step 3 (cellulose dialysis membrane can be used, about 10,000 MwCO), remove electrolyte ions in the solution, and obtain graphene quantum dot aqueous solution, which is as follows figure 1 shown. see figure 2 As shown, the obtained graphene quantum dots emit blue ...

Embodiment 2

[0039] Step 1. Use the graphite rod as the working electrode, the platinum sheet as the counter electrode, and connect the saturated calomel reference electrode to form a three-electrode system. Add Na with a concentration of about 0.5M 2 SO 4 solution as electrolyte;

[0040] Step 2. Use the electrochemical pulse method for stripping. The experimental parameters are designed to be 100s at a constant potential of positive potential 3V, and 100s at a negative potential of -3V. This reciprocating cycle is about 6h;

[0041] Step 3, centrifuging the black solution obtained in step 2 at a speed of 5000 rpm, discarding the lower graphite powder, and retaining the supernatant;

[0042] Step 4, dialyze the supernatant obtained in step 3 (a cellulose dialysis membrane can be used, MwCO is about 10,000), remove the electrolyte ions in the solution, and obtain an aqueous solution of graphene quantum dots.

Embodiment 3

[0044] Step 1. Use a graphite rod as a working electrode, a platinum sheet as a counter electrode, and connect a saturated calomel reference electrode to form a three-electrode system, and add a KOH solution with a concentration of about 6M as an electrolyte;

[0045] Step 2. Use the electrochemical pulse method for stripping. The experimental parameters are designed to be 100s at a constant potential of positive potential 5V, and 100s at a negative potential of -5V. This reciprocating cycle is about 6h;

[0046] Step 3, centrifuging the black solution obtained in step 2 at a speed of 5000 rpm, discarding the lower graphite powder, and retaining the supernatant;

[0047] Step 4, dialyze the supernatant obtained in step 3 (a cellulose dialysis membrane can be used, MwCO is about 10,000), remove the electrolyte ions in the solution, and obtain an aqueous solution of graphene quantum dots.

[0048] The method of the present invention can realize rapid preparation of high-quality,...

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Abstract

The present invention discloses a method for preparing graphene fluorescence quantum dots by using electrochemical pulse. The method comprises that: a graphite electrode is adopted as a first electrode, and the graphite electrode at least forms an electrochemical system with a second electrode, a reference electrode and an electrolyte; and an electrochemical pulse method is used to repeatedly and alternately apply positive potential and negative potential on the first electrode to make anions and cations in the electrolyte alternately enter between the layers of the graphite so as to make the layers of the graphite be peeled to obtain the graphene fluorescent quantum dots. With the method of the present invention, the rapid preparation of the high-quality, high-dispersity and the small-size graphene quantum dots can be achieved, the process is simple, the energy consumption is low, the efficiency is high, the industrial large-scale production is easily achieved, and the wide practical values and the industrial prospects are provided.

Description

technical field [0001] The invention relates to a method for preparing graphene quantum dots, in particular to a method for preparing graphene fluorescent quantum dots by electrochemical pulse, and belongs to the field of graphene material science. Background technique [0002] Graphene, as the thinnest two-dimensional material, is composed of a single layer of carbon atoms tightly packed. Due to its unique structure, graphene exhibits many excellent properties, including electrical, optical, thermal and mechanical properties, and has gradually become a research hotspot in the fields of chemistry, material science and physics in recent years. [0003] As a zero-dimensional graphene quantum dot in graphene, it has gradually attracted people's interest this year. Compared with traditional semiconductor quantum dots, graphene quantum dots are inexpensive, have excellent solubility, stable photoluminescence performance, large specific surface area, adjustable energy gap, low cy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/64
Inventor 田天张娟牛玉芳陈友虎秦禄昌
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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