Solutions of negatively charged graphene sheets and ribbons.
Negatively charged graphene layers from a graphite intercalation compound spontaneously dissolve in N-methylpyrrolidone, without the need for any sonication, yielding stable, air-sensitive, solutions of laterally extended atom-thick graphene sheets and ribbons with dimensions over tens of micrometers. These can be deposited on a variety of substrates. Height measurements showing single-atom thickness were performed by STM, AFM, multiple beam interferometry, and optical imaging on Sarfus wafers, demonstrating deposits of graphene flakes and ribbons. AFM height measurements on mica give the actual height of graphene (ca. 0.4 nm).
Vallés
Cristina
C
Centre de Recherche Paul Pascal-CNRS, Université de Bordeaux, Av. Schweitzer, 33600 Pessac, France.
Drummond
Carlos
C
Saadaoui
Hassan
H
Furtado
Clascidia A
CA
He
Maoshuai
M
Roubeau
Olivier
O
Ortolani
Luca
L
Monthioux
Marc
M
Pénicaud
Alain
A