Mild sonochemical exfoliation of bromine-intercalated graphite a new route towards graphene
2009 (English)In: Journal of Physics D: Applied Physics, ISSN 0022-3727, E-ISSN 1361-6463, Vol. 42, no 11, 112003- p.Article in journal (Refereed) Published
A method to produce suspensions of graphene sheets by combining solution-based bromine intercalation and mild sonochemical exfoliation is presented. Ultrasonic treatment of graphite in water leads to the formation of suspensions of graphite flakes. The delamination is dramatically improved by intercalation of bromine into the graphite before sonication. The bromine intercalation was verified by Raman spectroscopy as well as by x-ray photoelectron spectroscopy (XPS), and density functional theory (DFT) calculations show an almost ten times lower interlayer binding energy after introducing Br2 into the graphite. Analysis of the suspended material by transmission and scanning electron microscopy (TEM and SEM) revealed a significant content of few-layer graphene with sizes up to 30 µm, corresponding to the grain size of the starting material
Place, publisher, year, edition, pages
IOP Publishing Ltd , 2009. Vol. 42, no 11, 112003- p.
Physical Sciences Organic Chemistry Engineering and Technology
Research subject Chemistry with specialization in Inorganic Chemistry
IdentifiersURN: urn:nbn:se:uu:diva-111654DOI: 10.1088/0022-3727/42/11/112003ISI: 000266250300003OAI: oai:DiVA.org:uu-111654DiVA: diva2:282237