Method for quickly preparing graphene membrane by aid of strong base
A graphene film, alkali-assisted technology, applied in the field of preparation of new material graphene film, can solve the problems of residual, difficult transfer of graphene oxide film, corrosiveness, etc.
Inactive Publication Date: 2016-03-16
SOUTHEAST UNIV
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Problems solved by technology
The traditional method is the pressure transfer method. Specifically, the membrane formed by suction filtration is combined with the substrate to be transferred, and then a heavy object is pressed. After a few hours, the graphene oxide membrane on the filter paper can be transferred to the substrate. However, this method is time-consuming and it is difficult to completely transfer the graphene oxide film
The other is to dissolve the filter paper, which is to put the filter paper with graphene oxide membrane into the solvent that can dissolve the filter paper, so that the graphene oxide membrane can be separated from the filter paper, and then transferred to other substrates However, in the process of dissolving the filter paper in this method, there will be a large amount of residue, that is, it is difficult to obtain a pure graphene oxide film; finally, the filter paper with the graphene oxide film will be placed in the hydrogen iodide gas Reduction first, and then separation, but the hydrogen iodide used in this method is toxic and corrosive, which has a great impact on the ecological environment
Method used
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Embodiment 1
[0020] 1. Add graphite oxide to 50ml deionized water, and ultrasonically disperse to obtain a dispersion with a concentration of 0.5ug / ml;
[0021] 2. Suction filter the above dispersion liquid to form a membrane. The pore size of the filter paper is 0.22um. See figure 1 ;
[0022] 3. Put the above-mentioned freshly pumped film into the sodium hydroxide solution with a concentration of 10mg / ml under the condition of humidity. At this time, it is quickly found that the graphene oxide film is peeled off from the filter paper, see figure 2 , the graphene oxide film is complete;
[0023] 4. Put the target substrate in the above solution, pick up the graphene oxide film, and realize the transfer process.
Embodiment 2
[0025] The specific method is the same as in Example 1, except that the concentration of graphene oxide is 0.5 mg / ml, and the strong base is potassium hydroxide with a concentration of 0.5 g / ml.
Embodiment 3
[0027] The specific method is the same as in Example 1, except that the concentration of graphene oxide is 1 mg / ml, and the strong base is barium hydroxide with a concentration of 1 g / ml.
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The invention discloses a method for quickly preparing a graphene membrane by the aid of strong base. The method includes the specific steps that oxidized graphene dispersion liquid of a certain concentration is subjected to vacuum filtration so that a membrane can be formed; then the filtered membrane is placed in a strong base solution, the oxidized graphene membrane on filter paper can be automatically separated from the filter paper at once, and afterwards, the oxidized graphene membrane can be transferred to any needed substrate. The method has the advantages of being simple and easy to implement, low in cost, capable of transferring the membrane completely and the like.
Description
technical field [0001] The invention relates to the preparation of a new material graphene film, which mainly involves rapid preparation of the graphene film assisted by a strong alkali. Background technique [0002] Due to its excellent electrical properties, thermal properties, mechanical properties, etc., graphene has attracted more and more attention from the scientific and even industrial circles. However, in many applications such as transparent conductive electrodes, filter membranes, etc., it is necessary to prepare graphene oxide into a film. Among many film-forming methods, the suction filtration method has been greatly developed because of its simplicity. In order to use the membrane formed by suction filtration, it must be transferred to different substrates. The traditional method is the pressure transfer method. Specifically, the membrane formed by suction filtration is combined with the substrate to be transferred, and then a heavy object is pressed. After a...
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IPC IPC(8): C01B31/04
Inventor 孙立涛毕恒昌万树
Owner SOUTHEAST UNIV