CN103359727B - Preparation method of oxygen and chlorine co-doped graphene quantum dots - Google Patents
Preparation method of oxygen and chlorine co-doped graphene quantum dots Download PDFInfo
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- CN103359727B CN103359727B CN201310312836.0A CN201310312836A CN103359727B CN 103359727 B CN103359727 B CN 103359727B CN 201310312836 A CN201310312836 A CN 201310312836A CN 103359727 B CN103359727 B CN 103359727B
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Abstract
The invention discloses a preparation method of oxygen and chlorine co-doped graphene quantum dots, and relates to hydro-thermal preparation technology of the oxygen and chlorine co-doped graphene quantum dots. The hydro-thermal preparation technology of the oxygen and chlorine co-doped graphene quantum dots is characterized in that: under hydro-thermal conditions and hydrochloric acid catalysis conditions, a saccharide is used as a carbon source and an oxygen doping source, hydrochloric acid is used as a chlorine doping source, and water-soluble oxygen and chlorine co-doped graphene quantum dots are produced by water molecule-eliminating polymerization of saccharide molecules and the hydrochloric acid. The hydro-thermal preparation technology relates to simultaneous introduction of elements of oxygen and chlorine into the graphene quantum dots, so that electron transition effective energy levels in the graphene quantum dots can be increased, and furthermore the prepared oxygen and chlorine co-doped graphene quantum dots have more excellent luminescence and luminescence modulation performances.
Description
Technical field
The present invention relates to the preparation method of oxygen, chlorine co-doped graphene quantum dot, especially cheap sugar and hydrochloric acid is adopted to be raw material, use the technique of simple, environmental protection to prepare water-soluble, monodispersity good, and has the oxygen of the characteristics of luminescence, the method for chlorine co-doped graphene quantum dot.
Background technology
Owing to having special optical property, characteristic electron, chemical stability and spin character etc., graphene quantum dot (GQDs) has become a focus in the numerous research field of material at present.The technology of preparing of graphene quantum dot is various, wherein mainly comprises electron beam lithography, chemical synthesising technology, electrochemistry technology of preparing, graphene oxide (GO) reduction technique, polycyclic aromatic hydrocarbons pyrolytic technique etc.
At present, graphene quantum dot not yet obtains widespread use at optoelectronic areas, traces it to its cause, mainly because still lack one at present to carry out effective level structure, optical property modulation technique means to graphene quantum dot.In addition, produce graphene quantum dot in bulk and also there is a series of technical barrier at present.
Doping is a kind of effective means changing material level structure, optical property, electrical properties.Due to the semi-metallic that Graphene is class zero band gap, for the application of Graphene is expanded to field of optoelectronic devices from field of electronic devices, just must modulate being with of Graphene.At present, except adopting quantum confined effect and fringing effect, the adulterate level structure, electrical properties and the optical property that are also used to change grapheme material.But with regard to current Graphene doping techniques, generally adopt high vacuum, plasma or high-temperature technology, synthesis is carried out in two steps with doping, this not only consumes energy, danger, and step is numerous and diverse, is unfavorable for the application of doping type Graphene.
Graphene quantum dot material to be obtained in large quantity in advance, just must, materials environmental protection simple from technique, the preparation method that possesses batch production power start with.Obviously, Hydrothermal Synthesis technology not only has the ability of batch production concurrently, also possesses technology environmental protection, the feature such as nontoxic.The new technology of the present invention's exploitation " can unite two into one the controlled batch synthesis of graphene quantum dot " with doping effectively, and single step reaction completes.
Chinese patent, the patent No. 201110159907.9, the hydrothermal preparing process of a kind of water-soluble graphene quantum dots of title, the method is the aqueous solution adding 0.01 ~ 1.0M poly-hydroxy carbohydrate in hydrothermal reaction kettle, heat 10 ~ 600 minutes at 120 ~ 220 DEG C of temperature, allow glycan molecule shrink and aggregate into the graphene quantum dot that is of a size of 1 ~ 10nm and be prepared into.Technology of the present invention is different with it, technology of the present invention relates to introduces oxygen and chlorine element in graphene quantum dot simultaneously, compared with the graphene quantum dot that hydrothermal preparing process is obtained, graphene quantum dot of the present invention adds effective energy level of transition of electron in quantum dot, and then the oxygen that the present invention is prepared, chlorine co-doped graphene quantum dot have more excellent luminescence and luminance modulation performance.
Summary of the invention
The effective energy level of graphene quantum dot transition of electron being current hydrothermal preparing process obtains to be solved by this invention is low, and its problem that is luminous and luminance modulation poor-performing, provides the hydro-thermal synthetic preparation method of a kind of oxygen, chlorine co-doped graphene quantum dot.
The hydro-thermal synthetic preparation method of this oxygen of the present invention, chlorine co-doped graphene quantum dot, with low-cost sugar (fructose, glucose, sucrose) and hydrochloric acid for raw material, under hydrothermal reaction condition and hydrochloric acid catalysis condition, sugar is as carbon source and oxygen doping source, hydrochloric acid is as chlorine source, and glycan molecule and hydrochloric acid shrink to be polymerized and forms water-soluble oxygen, chlorine co-doped graphene quantum dot.
The hydro-thermal synthetic preparation method of oxygen of the present invention, chlorine co-doped graphene quantum dot, is characterized in that the method is realized by following step:
The first step, makes it be dissolved into sugar aqueous solution in sugared water, and in this sugar aqueous solution, sugared concentration is 0.1-15% wt;
Second step, adds hydrochloric acid in the sugar aqueous solution of the first step gained, and react 0.5 ~ 10 hour at 120 ~ 220 DEG C, wherein, the chlorine in hydrochloric acid and the carbon mol ratio in sugar are 5:1 ~ 1:10;
3rd step, reaction terminates, and cooling reaction solution, to room temperature, carries out dialysis purification with dialysis tubing, namely collects to obtain oxygen, chlorine co-doped graphene quantum dot.
Described sugar is fructose, glucose or sucrose.
In described preparation method, the permeable membrane of different cutoff can be selected be separated, quanta point material that purifying obtains different size.Select the dialysis tubing by molecular weight 1000 to carry out dialysis purification, then collect and obtain the oxygen that mean sizes is 5.4 nm, chlorine co-doped graphene quantum dot.
The present invention compared with prior art, is add hydrochloric acid in the reaction, and hydrochloric acid plays two effects in the reaction, and one is the carrying out of catalyzed reaction, and glycan molecule is dewatered in acid condition fast, effectively, forms the graphene base body of hexagonal structure; Two are to provide doped element chlorine, namely in graphene base body, introduce chlorine, and hydrochloric acid is that reactant effective and necessary in reaction system of the present invention is held concurrently catalyzer.
Oxygen, chlorine co-doped graphene quantum dot add effective energy level of transition of electron in quantum dot, the transition only transition between π and the π * of sp2 carbon of unadulterated graphene quantum dot electronic level, electron absorption can be 5. 4eV, photoluminescence wavelength is 303nm and 412nm, and emission wavelength is positioned at deep ultraviolet and blue wave band.By mixing oxygen and chlorine in graphene quantum dot simultaneously, can will introduce oxygen, chlorine energy level by inter-stage at π and the π * of sp2 carbon simultaneously, there is 2.6eV(oxygen energy level) and 3.5eV(chlorine energy level) transition of electronic energy, transition of electron pattern is made to become variation, send the light of 600nm and 700nm, emission wavelength and then expansion are to gold-tinted, ruddiness.This is conducive to the application of material in bio-imaging, opto-electronic device, photonic device etc.
Product prepared by preparation technology of the present invention and the method has following advantage:
(1) monodispersity: the median size of oxygen prepared by the present invention, chlorine co-doped graphene quantum dot is 5.4nm, and it is narrow that quantum dot is evenly distributed size;
(2) technique is simple: chlorine doped quantum dot prepared by the present invention is simple to operate, reacts a step and completes;
(3) water-soluble: oxygen prepared by the present invention, chlorine co-doped graphene quantum dot are dissolved in water, have wide application space;
(4) preparation technology's environmental protection: the present invention prepares the synthetic technology of oxygen, chlorine co-doped graphene quantum dot, does not need the synthesis of intermediate, and reactant is simple, nontoxic;
(5) batch production is easy to: because hydro-thermal reaction device can amplify according to industrial scale, so may be used for industrial mass manufacture;
(6) the excellent characteristics of luminescence: oxygen prepared by the present invention, chlorine co-doped graphene quantum dot, UV-light, visible ray, infrared ray excited under, all can be luminous.This special, excellent luminescent properties has expanded its application in fields such as bio-imaging, fluorescent mark, photochemical catalysis, nonlinear optics, photoelectrons.
Oxygen prepared by the present invention, chlorine co-doped graphene quantum dot, prove that being with of Graphene is openable.And, there is the good characteristics of luminescence and water-soluble.And by oxygen, the mixing of chlorine element, graphene quantum dot is effectively modulated in level structure, optical characteristics etc., thus the efficient extn application of graphene quantum dot.This technology has using value widely, and it is different from semimetallic Graphene, and it can be widely used in the fields such as semi-conductor industry, bioluminescence, matrix material.
Accompanying drawing explanation
Fig. 1 is the x-ray photoelectron spectroscopy figure (Cl 2p XPS) of oxygen, chlorine co-doped graphene quantum dot.
Fig. 2 is the uv-visible absorption spectroscopy figure of oxygen, the chlorine co-doped graphene quantum dot aqueous solution.
Fig. 3 is the photoluminescence spectrum (Ex=325nm) of oxygen, the chlorine co-doped graphene quantum dot aqueous solution.
Fig. 4 is oxygen, chlorine co-doped graphene quantum dot low range transmission electron microscope picture.
Fig. 5 is oxygen, chlorine co-doped graphene quantum dot grain size distribution (mean sizes 5.4nm).
Fig. 6 is oxygen, chlorine co-doped graphene quantum dot high-resolution-ration transmission electric-lens figure.
Fig. 7 is outside drawing under oxygen, chlorine co-doped graphene quantum dot solution natural light.
Fig. 8 is oxygen, chlorine co-doped graphene quantum dot solution ultraviolet lighting fluorogram.
Fig. 9 is X-ray energy spectrum (EDS) figure of embodiment 1 oxygen, chlorine co-doped graphene quantum dot, the content of oxygen and chlorine is respectively ~ and 5
atm%, ~ 2
atm%.
Embodiment
Embodiment 1: take 0.5 gram of fructose, adds 39.5 mL deionized waters, stirs and sugar is dissolved.In sugar soln, add 0.5 mL hydrochloric acid (32%, wt), stir.Reaction solution is heated 4 hours under 170 DEG C of hydrothermal conditions.Cooling reaction solution, to room temperature, carries out dialysis purification with the dialysis tubing by molecular weight 1000, collects sample, obtains the oxygen that mean sizes is 5.4 nm, chlorine co-doped graphene quantum dot.
Embodiment 2: take 1.5 grams of glucose, adds 38.5 mL deionized waters, stirs and glucose is dissolved.In glucose solution, add 0.2 mL hydrochloric acid (32%, wt), stir.Reaction solution is heated 2 hours under 180 DEG C of hydrothermal conditions.Cooling reaction solution, to room temperature, carries out dialysis purification with the dialysis tubing by molecular weight 3000, collects sample, obtains the oxygen that mean sizes is 7.2 nm, chlorine co-doped graphene quantum dot.
Embodiment 3: take 0.3 gram of sucrose, adds 39.7 mL deionized waters, stirs and makes sucrose dissolved.In sucrose solution, add 0.6 mL hydrochloric acid (32%, wt), stir.Reaction solution is heated 3 hours under 190 DEG C of hydrothermal conditions.Cooling reaction solution, to room temperature, carries out dialysis purification with the dialysis tubing by molecular weight 1000, collects sample, obtains the oxygen that mean sizes is 4.9 nm, chlorine co-doped graphene quantum dot.
Claims (2)
1. a hydro-thermal synthetic preparation method for oxygen, chlorine co-doped graphene quantum dot, is characterized in that the method is realized by following step:
The first step, makes it be dissolved into sugar aqueous solution in sugared water, and in this sugar aqueous solution, sugared concentration is 0.1-15% wt;
Second step, adds hydrochloric acid in the sugar aqueous solution of the first step gained, and react 0.5 ~ 10 hour at 120 ~ 220 DEG C, wherein, the chlorine in hydrochloric acid and the carbon mol ratio in sugar are 5:1 ~ 1:10;
3rd step, reaction terminates, and cooling reaction solution, to room temperature, carries out dialysis purification with dialysis tubing, namely collects to obtain oxygen, chlorine co-doped graphene quantum dot.
2. the hydro-thermal synthetic preparation method of a kind of oxygen as claimed in claim 1, chlorine co-doped graphene quantum dot, is characterized in that described sugar is fructose, glucose or sucrose.
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| CN103833029B (en) * | 2014-01-10 | 2016-03-02 | 云南师范大学 | The preparation method of the water-soluble sulphur of a kind of efficient multicolor fluorescence, oxygen codoped graphene quantum dot |
| CN104045076B (en) * | 2014-01-17 | 2016-01-20 | 中国科学院上海微系统与信息技术研究所 | The preparation method of graphene oxide quantum dot |
| CN104140084B (en) * | 2014-08-01 | 2016-02-17 | 中国人民解放军国防科学技术大学 | A kind of preparation method of carbonitride quantum dot |
| US20160087148A1 (en) | 2014-09-19 | 2016-03-24 | National Cheng Kung University | Non-metallic semiconductor quantum dot and method of carrying out chemical reaction or photoluminescence reaction by using the same |
| CN107011896B (en) * | 2016-01-27 | 2019-12-10 | 云南师范大学 | Preparation method of potassium-doped graphene quantum dots |
| CN107011897A (en) * | 2016-01-27 | 2017-08-04 | 云南师范大学 | A kind of preparation method of additive Mn graphene quantum dot |
| CN107572505A (en) * | 2016-07-04 | 2018-01-12 | 云南师范大学 | A kind of preparation method of Ag doping graphene quantum dot |
| CN106601591B (en) * | 2016-12-21 | 2019-12-03 | 昆明物理研究所 | Chlorine doped multi-layer method for preparing graphene membrane |
| CN108314005A (en) * | 2018-03-27 | 2018-07-24 | 广西师范大学 | A kind of method and its device preparing chlorine doped graphene quantum dot |
| CN108795421B (en) * | 2018-04-11 | 2020-07-31 | 北京科技大学 | Preparation method and application of chlorine-doped graphene quantum dots |
| CN108911524B (en) * | 2018-08-30 | 2021-07-16 | 昆明理工大学 | Preparation method of Cl-doped glucose carbon-based graphene |
| CN110437836B (en) * | 2019-08-21 | 2022-07-29 | 宁波石墨烯创新中心有限公司 | Phosphorescent material based on graphene quantum dots and preparation method thereof |
| CN114316963A (en) * | 2021-12-03 | 2022-04-12 | 郑州大学 | Carbonized polymer dot and preparation method and application thereof |
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| CN102190296B (en) * | 2011-06-15 | 2015-07-15 | 昆明物理研究所 | Hydrothermal method for preparing water-soluble graphene quantum dots |
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