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We report the use of microfluidics to functionalize suspended reduced graphene oxide flakes through the addition of aryl radical, generated in situ by reaction between aryl amines and isopentyl nitrite. Microfluidic enabled a tight control of temperature, reaction times, and stoichiometric ratios, making it possible to tune the growth of oligomers on the surface of the flakes, which in turn affects the interactions of the functional material with the surrounding environment. The results suggest that shear stress phenomena within the reactor may play a role in the chemistry of graphene materials by providing a constant driving force toward exfoliation of the layered structures. Scale-up of the functionalization process is also reported along with the grafting of dyes based on squaric acid cores. Photophysical characterization of the dye-modified flakes proves that the microfluidic approach is a viable method toward the …
American Chemical Society
Publication date: 
13 Apr 2018

Simone Silvestrini, Christian C De Filippo, Nicola Vicentini, Enzo Menna, Raffaello Mazzaro, Vittorio Morandi, Luca Ravotto, Paola Ceroni, Michele Maggini

Biblio References: 
Volume: 30 Issue: 9 Pages: 2905-2914
Chemistry of Materials