Abstracts Book - IMRC 2018

• SA1-P051
COMPARATIVE STUDY OF FREESTANDING GRAPHENE OXIDE
FILMS PREPARED BY DISPERSION CASTING AND VACUUM
FILTRATION
Estefania Rosario Silva Osuna 1 , Roque Sánchez Salas 2 , Andrés Castro Beltrán 1 , Rodolfo Cruz
Silva 3,4 , Aaron Morelos Gomez 3 , Mauricio Terrones 4,5 , Morinobu Endo 3,4
1
Universidad Autónoma de Sinaloa, Facultad de Ingeniería, Mexico. 2 Instituto Potosino de
Investigación Científica y Tecnológica, Dapartamento de materiales avanzados, Mexico.
3 Shinshu University, Global Aqua Innovation Center, Japan. 4 Shinshu University, Institute of
Carbon Science and Technology, Japan. 5 Penn State University, Department of Physics,
Chemistry, Materials Science and Engineering, Center for 2-Dimensional and Layered Materials
and Center for Atomically Thin Multifunctional Materials (ATOMIC), United States.
Graphene oxide (GO) and reduced graphene oxide (rGO) films have shown
extraordinary mechanical and electronic properties, respectively, thus giving
them a wide range of potential applications. However, the purification process
following the oxidation stage is a limiting factor for its scalability. Typical
purification requires several centrifugation steps or filtering. In this work, GO
was prepared via a modified Hummers method with an extended oxidation
time, and it was later purified by washing with HCl and acetone to reduce the
centrifugation time. Fourier transform infrared spectra confirmed the oxidation
of graphite into GO, as well as the removal of residual salts and acid after
washing. The purified GO was used to prepare freestanding films by two
different methods: dispersion casting and vacuum filtering. We were able to
produce thin GO translucid films by casting, with surface density as low as 0.059
mg/cm 2 . A comparison of the films obtained by casting and vacuum filtration
shows marked differences in their structure, specifically, the cast films are
flexible due to the presence of micro wrinkles, and the filtered films are brittle
and exhibit a morphology defined by the support filter. According to these
results, we propose a mechanism of film morphology, and developed a
succesful way to to prepare ultrathin freestanding GO films of ultra-high
toughness.
Keywords: graphene oxide, freestanding films, morphology
Presenting authors email: estefania.silva.fim@uas.edu.mx