Technical Proceedings of the 2013 Clean Technology Conference and Trade Show

Cleantech 2013

Chapter 8: Materials for Catalysis

Authors:
K. Hielscher
Affilation:
Hielscher Ultrasonics, DE
Pages:
322 - 329
Keywords:
ultrasonic, high-power ultrasound, graphene, graphene sheets, preparation, functionalization, dispersion
Abstract:
Since the extraordinary characteristics of graphite and graphene are known, several methods for its preparation have been developed. Beside to chemical production of graphenes from graphene oxide in multi-step processes, for which very strong oxidizing and reducing agents are needed. Additionally, the graphene prepared under these harsh chemical conditions often contain a large amount of defects even after reduction compared to graphenes obtained from other methods. However, ultrasound is a proven alternative to produce high quality graphene, also in large quantities. Researchers have developed different ways using ultrasound, but in general the graphene production is a simple one-step process. To give an example of a specific graphene production route: Graphite is added in a mixture of dilute organic acid, alcohol, and water, and then the mixture is exposed to ultrasonic irradiation. The acid works as a “molecular wedge” which separates sheets of graphene from the parent graphite. By this simple process, a large quantity of undamaged, high-quality graphene dispersed in water is created. (An et al. 2010)
Ultrasonically-Assisted Preparation and Functionalization of Graphene
ISBN:
978-1-4822-0594-7
Pages:
514