Superparamagnetic Reduced Graphene Oxide with Large Magnetoresistance: A Surface Modulation Strategy
- 28 January 2016
- journal article
- research article
- Published by Wiley in Angewandte Chemie
- Vol. 55 (9), 3176-3180
- https://doi.org/10.1002/anie.201511436
Abstract
The graphene system is actively pursued in spintronics for its nontrivial sp electron magnetism and its potential for the flexible surface chemical tuning of magnetoelectronic functionality. The magnetoresistance (MR) of graphene can be effectively tuned under high magnetic fields at cryogenic temperatures, but it remains a challenge to achieve sensitive magnetoelectric response under ambient conditions. We report the use of surface modulation to realize superparamagnetism in reduced graphene oxide (rGO) with sensitive magnetic field response. The superparamagnetic rGO was obtained by a mild oxidation process to partially remove the thiol groups covalently bound to the carbon framework, which brings about large low-field negative MR at room temperature (-8.6 %, 500 Oe, 300 K). This strategy provides a new approach for optimizing the intrinsic magnetoelectric properties of two-dimensional materials.Funding Information
- National Basic Research Program of China (2015CB932302)
- National Natural Science Foundation of China (21222101, 21501164, U1432133, 11132009, 21331005, 11321503, J1030412)
- Chinese Academy of Sciences (XDB01020300)
- Fok Ying-Tong Education Foundation (141042)
- Fundamental Research Funds for the Central Universities (WK2060190027, WK2340000065)
This publication has 29 references indexed in Scilit:
- Realization of ferromagnetic graphene oxide with high magnetization by doping graphene oxide with nitrogenScientific Reports, 2013
- Investigation of MoS2 and Graphene Nanosheets by Magnetic Force MicroscopyACS Nano, 2013
- The chemistry of graphene oxideChemical Society Reviews, 2009
- Raman Spectra of Graphite Oxide and Functionalized Graphene SheetsNano Letters, 2007
- Collective behaviour in two-dimensional cobalt nanoparticle assemblies observed by magnetic force microscopyNature Materials, 2004
- Spintronics: A Spin-Based Electronics Vision for the FutureScience, 2001
- MAGNETIC FORCE MICROSCOPYAnnual Review of Materials Science, 1999
- From ultrasoft pseudopotentials to the projector augmented-wave methodPhysical Review B, 1999
- Giant magnetoresistance for superparamagnetic particles: Melt-spun granular CuCoPhysical Review B, 1995
- Giant magnetoresistance in heterogeneous Cu-Co alloysPhysical Review Letters, 1992