Preparation method of graphene oxide sheet with different layers/liquid crystal/film
A graphene sheet and graphene technology, applied in the field of graphene oxide preparation, can solve the problems that the self-assembly process of graphene oxide sheet has not been reported yet, and achieve good application prospects, simple method, and controllable film size
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Embodiment 1
[0018] (1) Disperse 2g of graphite oxide in 1600ml of deionized water to form a suspension with a mass concentration of 0.125%, ultrasonicate for 0.5h at a power of 240W to disperse the graphite oxide in deionized water evenly; keep the dispersion at 10000r / min constant Centrifuge at the centrifugal speed, extract the bottom layer of the centrifuge tube every 30 minutes and record it as a group of samples, a total of 12 extractions, the atomic force microscope photos of the samples extracted at intervals of 30 minutes, 3 hours, and 6 hours are shown in figure 1 , it can be seen that the samples extracted at intervals of 30min, 3h, and 6h are respectively multi-layer, double-layer, and single-layer graphene oxide sheets, that is, as the extraction time increases, the thickness of the sample (the number of layers) gradually decreases;
[0019] (2) Then centrifuge and concentrate the samples extracted at intervals of 30min, 3h, and 6h at 10,000r / min for 30min, and the lower liquid...
Embodiment 2
[0022] Extend the interval time in step (1) to 2h, and extract 4 times. Correspondingly, the centrifugation time in step (2) is also extended to 2h, and the others are the same as in Example 1.
Embodiment 3
[0024] (1) Disperse 1g of graphite oxide in 1500ml of deionized water to form a suspension with a mass concentration of 0.067%, ultrasonicate for 20min at a power of 240W to disperse the graphite oxide in deionized water evenly; centrifuge the dispersion at 10000r / min Centrifuge at high speed, extract the lower layer of the centrifuge tube every 1 hour, record it as a set of samples, extract 6 times in total, and obtain graphene oxide sheets with gradually reduced layers;
[0025] (2), and then centrifuge and concentrate the above samples at 10000r / min for 1h, and the lower layer is graphene oxide liquid crystal;
[0026] (3) Then, drop-coat the obtained graphene oxide liquid crystal on a glass plate, and dry it naturally at room temperature of 25° C. to obtain a graphene oxide film with birefringence.
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