TY - JOUR
T1 - Graphene non-covalently tethered with magnetic nanoparticles
AU - Fullerton, Robert J.
AU - Cole, Daniel P.
AU - Behler, Kristopher D.
AU - Das, Sriya
AU - Irin, Fahmida
AU - Parviz, Dorsa
AU - Hoque, M. N.F.
AU - Fan, Zhaoyang
AU - Green, Micah J.
N1 - Funding Information:
The authors would like to acknowledge Rozana Bari, Shane Metzler, Dr. Weile Yan, Dr. Sanjoy K. Bhattacharia, Dr. Brandon L. Weeks, and Dr. Ronald Hedden of TTU for helpful insight as well as N. Arsalani and H. Fattahi of the University of Tabriz for synthesis advice. Funding was provided by the U.S. National Science Foundation (NSF) under CAREER award CMMI-1253085 and by the Air Force Office of Scientific Research Young Investigator Program (AFOSR FA9550-11-1-0027), and by the TTU Center for Undergraduate Research. DLS measurements were conducted in the Materials Characterization Center with the support of Dr. Juliusz Warzywoda and Dr. Al Sacco of TTU. We also acknowledge the TTU Imaging Center (funded by NSF MRI 04-511) supported by Professor Lauren S. Gollahon for the HRTEM images. Dr. K. Behler is a Bowhead Science and Technology (BST) Senior Scientist at ARL, and he gratefully acknowledges support from the ARL-BST Program.
PY - 2014/6
Y1 - 2014/6
N2 - We describe a novel approach for coupling pristine graphene with superparamagnetic iron oxide nanoparticles to create dispersed, magnetically responsive hybrids. The magnetic iron oxide (Fe3O4) nanoparticles are synthesized by a co-precipitation method using ferric (Fe 3+) and ferrous (Fe2+) salts and then grafted with polyvinylpyrrolidone (PVP). These PVP-grafted Fe3O4 nanoparticles are then used to stabilize colloidal graphene in water. The PVP branches non-covalently attach to the surface of the pristine graphene sheets without functionalization or defect creation. These Fe3O 4-graphene hybrids are stable against aggregation and are highly responsive to external magnetic fields. These hybrids can be freeze-dried to a powder or magnetically separated from solution and still easily redisperse while retaining magnetic functionality. At all stages of synthesis, the Fe 3O4-graphene hybrids display no coercivity after being brought to magnetic saturation, confirming superparamagnetic properties. Microscopy and light scattering data confirm the presence of pristine graphene sheets decorated with Fe3O4 nanoparticles. These materials show promise for multifunctional polymer composites as well as biomedical applications and environmental remediation.
AB - We describe a novel approach for coupling pristine graphene with superparamagnetic iron oxide nanoparticles to create dispersed, magnetically responsive hybrids. The magnetic iron oxide (Fe3O4) nanoparticles are synthesized by a co-precipitation method using ferric (Fe 3+) and ferrous (Fe2+) salts and then grafted with polyvinylpyrrolidone (PVP). These PVP-grafted Fe3O4 nanoparticles are then used to stabilize colloidal graphene in water. The PVP branches non-covalently attach to the surface of the pristine graphene sheets without functionalization or defect creation. These Fe3O 4-graphene hybrids are stable against aggregation and are highly responsive to external magnetic fields. These hybrids can be freeze-dried to a powder or magnetically separated from solution and still easily redisperse while retaining magnetic functionality. At all stages of synthesis, the Fe 3O4-graphene hybrids display no coercivity after being brought to magnetic saturation, confirming superparamagnetic properties. Microscopy and light scattering data confirm the presence of pristine graphene sheets decorated with Fe3O4 nanoparticles. These materials show promise for multifunctional polymer composites as well as biomedical applications and environmental remediation.
UR - http://www.scopus.com/inward/record.url?scp=84900569622&partnerID=8YFLogxK
U2 - 10.1016/j.carbon.2014.02.002
DO - 10.1016/j.carbon.2014.02.002
M3 - Article
AN - SCOPUS:84900569622
VL - 72
SP - 192
EP - 199
JO - Carbon
JF - Carbon
SN - 0008-6223
ER -