High stability of few layer graphene nanoplatelets in various solvents

2nd International Conference on Mining, Material and Metallurgical Engineering

矿业工程;材料科学;冶金学

Xu, X.^1 ; Zhou, J.^1 ; Lubineau, G.^1

King Abdullah University of Science and Technology (KAUST), Physical Science and Engineering Division, COHMAS Laboratory, Thuwal

23955-6900, Saudi Arabia^1

关键词: Aqueous colloidal solutions;    Aqueous suspensions;    Colloidal solutions;    Dispersibilities;    Dispersion methods;    Few-layer graphene;    Nondestructive methods;    Sodium hypochlorites;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/191/1/012015/pdf
DOI  :  10.1088/1757-899X/191/1/012015

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Dispersion of few-layer graphene nanoplatelets (GNPs) in liquid media is a crucial step for various applications. Here, we highlight a simple, nondestructive method for preparing stable aqueous colloidal solutions with GNP powder quickly dispersed in 5 wt.% sodium-hypochlorite- (NaClO) and sodium-bromide- (NaBr) salted solvent by bath sonication. This method makes it possible to easily prepare a highly concentrated colloidal solution (1 mg•ml-1) of GNPs that can easily be re-dispersed in water (treated GNPs). The aqueous suspension we prepared remained stable for longer than a few weeks. We made similar tests with various solvents and dispersibility appeared to decrease with decreasing polarity. High-concentration suspensions using our facile dispersion method could be of particular interest to the large community using graphene for a diversity of applications.