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Ultrasonic and graphene (sheet) preparation, exfoliation and dispersion

2021-04-30 10:44:57

Ultrasonic preparation of graphene
As the special properties of graphite are already known, several graphite preparation methods have been developed. In addition to chemically producing graphene from graphene oxide in a multi-step process, very strong oxidizing and reducing agents are also required. In addition, compared with graphene obtained from other methods, graphene prepared under these harsh chemical conditions often contains a large number of defects even after reduction. However, ultrasound is a proven alternative method that can produce large quantities of high-quality graphene. Researchers use ultrasound to develop a slightly different method, but generally speaking, graphene production can be completed in just one step.

To give an example of a specific graphene production process: add graphite to a mixture of dilute organic acid, alcohol and water, and then expose the mixture to ultrasonic radiation. The acid acts as a "molecular wedge" to separate the graphene sheet from the parent graphite. Through this simple process, a large amount of undispersed, high-quality graphene dispersed in water is produced.

Ultrasonic treatment of graphene oxide #
The preparation process of using ultrasonic radiation to prepare the graphene oxide (GO) layer. Twenty-five milligrams of graphene oxide powder was suspended in 200 milliliters of deionized water. An uneven brown suspension was obtained by stirring. The resulting suspension was ultrasonically processed (30 minutes, 1.3×105J), and after drying (373K), ultrasonically processed graphene oxide was prepared. FTIR spectroscopy shows that ultrasonic treatment does not change the functional groups of graphene oxide.

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