CN102039421B - Preparation method of organic film monodisperse silver quantum dots - Google Patents
Preparation method of organic film monodisperse silver quantum dots Download PDFInfo
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- CN102039421B CN102039421B CN 201010572451 CN201010572451A CN102039421B CN 102039421 B CN102039421 B CN 102039421B CN 201010572451 CN201010572451 CN 201010572451 CN 201010572451 A CN201010572451 A CN 201010572451A CN 102039421 B CN102039421 B CN 102039421B
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Abstract
The invention provides a method for preparing silver quantum dots. The method comprises the following steps: injecting silver ions on an organic thin film by the ion injection method; and utilizing an electron beam to irradiate a substrate with the injected silver ions, thus forming the silver quantum dots. By utilizing the method for preparing the silver quantum dots, monodisperse silver quantum dots with uniform size and controllable density can be obtained.
Description
Technical field
The present invention relates to a kind of preparation method of quantum dot, more specifically, the present invention relates to a kind of preparation method of silver-colored quantum dot.
Background technology
In recent years, along with nanoscale science and technology develops rapidly, utilize chemistry or physical method to prepare the research that nanostructured has become one of nano science study hotspot, particularly quantum dot, cause domestic and international researcher's broad interest.The silver quantum dot both can be used as Raman and had strengthened substrate, can change the photoluminescence spectrum that quantum dot adheres to specimen material again.The silver-colored quantum dot of sample surfaces both can play the effect of sterilization, can be used as again silver-colored quantum dot catalyst etc.Especially Raman strengthen and catalytic performance aspect, the best results of silver, so more extensive about the research of silver-colored quantum dot.Simultaneously silver-colored quantum dot also can be formed on the medicine equipment, is used for sterilization.
The method of the silver-colored quantum dot of existing preparation comprises liquid phase process and template.Liquid phase process is under liquid environment silver salt to be reduced the method that generates the argent quantum dot.The method makes the silver-colored quantum dot that obtains reunite easily, may introduce various surfactants in the quantum dot that obtains simultaneously, has affected silver-colored quantum dot purity and serviceability.Zhou Jiangbo, Fang Yan are being entitled as " utilizing the AAO template to prepare quantum dot ", the light scattering journal, the 2nd phase of the 18th volume June in 2006, article in the method that a kind of method of utilizing anodic oxidation aluminium formwork to adopt vacuum evaporation prepares silver-colored quantum dot is disclosed, the method has obtained diameter 50nm, and length is less than the silver-colored quantum dot of 100nm.But the quantum dot particle diameter that adopts the preparation of AAO method is confined to the size of template.
Thereby need a kind of can prepare be uniformly dispersed, particle diameter is controlled and the method for unpolluted silver-colored quantum dot.
Summary of the invention
Prepare the defects in the method for silver-colored quantum dot in order to overcome prior art, the invention provides a kind of with the combine method of the silver-colored quantum dot of preparation of Implantation and electron beam irradiation.
The invention provides a kind of method for preparing silver-colored quantum dot, the method may further comprise the steps:
Utilize the method for Implantation to inject silver ion in the substrate of organic film;
Utilize electron beam irradiation to be injected with the substrate of silver ion, form silver-colored quantum dot.
Preferably, be 10 in vacuum
-1-10
-4Handkerchief, accelerating potential 10kV-100kV, implantation dosage are 1 * 10
14Cm
-2-1 * 10
16Cm
-2Condition under carry out Implantation.
Preferably, be 10 in vacuum
-1-10
-3Handkerchief, accelerating potential 30kV-50kV, implantation dosage are 4 * 10
14Cm
-2-8 * 10
15Cm
-2Condition under carry out Implantation.
Preferably, described electron beam irradiation accelerating potential is 80-220kV.
Preferably, described electron beam irradiation accelerating potential is 100-200kV.
Compared with prior art, it is simple that the method according to this invention has preparation technology, the process conditions that do not need specific harshness, the characteristics that do not need mask plate, resulting quantum dot is formed uniformly in substrate with monodispersed form, do not produce agglomeration, particle diameter is about 3 nanometers, and yardstick is much smaller than the quantum dot that utilizes conventional quantum dot preparation method to obtain.The method according to this invention can form silver-colored quantum dot at various organic films.Silver accelerates by accelerating potential with ionic species, is injected into equably in the base material, is present in the base material with ion or with the form of compound that sample forms silver.When the electron beam irradiation substrate, the silver ion or the silver compound that are present in the base material are reduced into silver-colored simple substance, the common quantum dot that forms of approximating simple substance silver.The gathering that base material has intercepted formed silver-colored quantum dot makes it not produce reunion, has formed thus single dispersion quantum dot.
Organic film material all can be used as the base material that forms silver-colored quantum dot.By regulating accelerating potential and the dosage of Implantation, can control the degree of depth and the density of resulting silver-colored quantum dot.Change the dosage of Implantation silver ion, can change the density of silver-colored quantum dot and irrelevant with the particle diameter of formed silver-colored quantum dot.The dosage of Implantation can't form quantum dot if the dosage of Implantation is too little, and if may form metal film too greatly.
Beneficial effect of the present invention:
1. the present invention injects the substrate of organic film by Implantation with silver ion and adopts electron beam irradiation that the silver ion reduction that injects is obtained silver-colored quantum dot, has simplified the single complex process steps of disperseing silver-colored quantum dot of preparation, and has had good good reproducibility;
2. the silver-colored quantum dot size that obtains is little, about 3 nanometers;
3. the silver-colored quantum dot that obtains presents monodispersity, does not produce reunion;
4. the Choice of substrate materials scope that forms silver-colored quantum dot is large.
Description of drawings
Fig. 1 is the high resolution picture according to the silver-colored quantum dot of the method acquisition of the embodiment of the invention 1.
Fig. 2 is the transmission electron microscope photo according to the silver-colored quantum dot of the method acquisition of the embodiment of the invention 2.
Fig. 3 is the transmission electron microscope photo according to the silver-colored quantum dot of the method acquisition of the embodiment of the invention 3.
Fig. 4 is according to the transmission electron microscope photo of the silver-colored quantum dot of the method acquisition of the embodiment of the invention 3 and energy spectrogram.
The specific embodiment
The below illustrates the method for preparing the Ag quantum dot in substrate according to of the present invention to prepare silver-colored quantum dot as example in the organic film substrate.In an embodiment of the present invention, the magnificent film in employing side (formvar) is as base material.
Method according to the silver-colored quantum dot of preparation of the present invention may further comprise the steps:
1. at normal temperatures, take silver as ion gun, organic film is carried out Implantation.
2. with the organic film of electron beam irradiation through Implantation, the silver ion in the organic film obtains electronics, is reduced to silver-colored simple substance, forms silver-colored quantum dot.
Can find out that from transmission electron microscope photo silver-colored quantum dot is monodispersed.The implantation dosage of Implantation is larger, and the density of quantum dot is larger, and the particle diameter of quantum dot changes hardly.Select suitable condition, also can prepare monodispersed quantum dot at other base material.
Example 1
The below to be to use the ion implantation apparatus of LC-4 model, take the magnificent film in side as substrate as example, the method for the silver-colored quantum dot of formation according to the present invention is carried out the step explanation.The method can be applicable to use other substrate to form quantum dot.
Adopt silver foil as the target source, at vacuum 1x10
-3Handkerchief, accelerating potential 30kV, implantation dosage are 4.9 * 10
14Cm
-2Condition under, the side magnificent film inject silver ion, then the magnificent film in the side that is injected with silver ion is carried out electron beam irradiation, electron irradiation voltage is 100kV.Can see that under transmission electron microscope film produces uniform silver-colored quantum dot, diameter is about 3 nanometers, and silver-colored quantum dot density is about 6326 μ m
-2, as shown in Figure 1.
Example 2
Adopt silver foil as the target source, at vacuum 5x10
-2Handkerchief, accelerating potential 40kV, implantation dosage are 2.45 * 10
15Cm
-2Condition under, the side magnificent film inject silver ion, then the magnificent film in the side that is injected with silver ion is carried out electron beam irradiation, electron irradiation voltage 150kV.Can see that under transmission electron microscope film produces uniform silver-colored quantum dot, diameter is about 3 nanometers, and silver-colored quantum dot density is about 8005 μ m
-2, as shown in Figure 2.
Example 3
Adopt silver foil as the target source, at vacuum 1x10
-2Handkerchief, accelerating potential 50kV, implantation dosage are 7.35 * 10
15Cm
-2Condition under, the side magnificent film inject silver ion, then the magnificent film in the side that is injected with silver ion is carried out electron beam irradiation, electron irradiation voltage 200kV.Can see that under transmission electron microscope film produces uniform silver-colored quantum dot, diameter is about 3 nanometers, and silver-colored quantum dot density is about 40816 μ m
-2, as shown in Figure 3.
The quantum dot that Fig. 4 illustrates in the sample that obtains according to example 3 is silver-colored quantum dot.Can be found out by spectrogram by shown in Figure 4, except as the C and O element that comprise in the Cu element of copper mesh and the organic film, be formed with in the substrate of silver-colored quantum dot and do not contain other impurity.
By more above-mentioned three examples as can be known, along with the increase of the dosage of Implantation, the density of quantum dot increases thereupon in the organic film, and quantum point grain diameter is without remarkable change.
The above is with reference to the example preferred embodiments of the present invention have been disclosed for illustrative.It will be appreciated by those skilled in the art that even without other details, describe more than those skilled in the art also can utilize in the widest scope.Therefore, preferred embodiment only should be considered as illustrative open, must not be considered as the restriction of any mode.
Claims (3)
1. method for preparing silver-colored quantum dot is characterized in that the method may further comprise the steps:
Utilizing the method for Implantation is 10 in vacuum
-1-10
-4Handkerchief, accelerating potential 10kV-100kV, implantation dosage are 1 * 10
14Cm
-2-1 * 10
16Cm
-2Condition under inject silver ion in the substrate of organic film;
Utilize electron beam irradiation to be injected with the substrate of silver ion, form silver-colored quantum dot, described electron beam irradiation accelerating potential is 80-220kV.
2. the method for the silver-colored quantum dot of preparation according to claim 1 is characterized in that, is 10 in vacuum
-1-10
-3Handkerchief, accelerating potential 30kV-50kV, implantation dosage are 4 * 10
14Cm
-2-8 * 10
15Cm
-2Condition under carry out Implantation.
3. the method for the silver-colored quantum dot of preparation according to claim 1 is characterized in that, described electron beam irradiation accelerating potential is 100-200kV.
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| MX362092B (en) * | 2012-04-17 | 2019-01-07 | Indian Institute Of Tech | Detection of quantity of water flow using quantum clusters. |
| CN106906451B (en) * | 2017-01-06 | 2019-06-11 | 四川大学 | A kind of electron irradiation preparation method of film surface aluminium oxide quantum dot |
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Non-Patent Citations (3)
| Title |
|---|
| JP特开2005-203441A 2005.07.28 |
| 卢金军等.半导体量子点的制备、性质和应用.《孝感学院学报》.2007,144-148. * |
| 谢二庆等.离子注入制备量子光电材料的研究.《原子核物理评论》.1998,第15卷(第3期),166-169,174. * |
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