title: Superparamagnetic Reduced Graphene Oxide with Large Magnetoresistance: A Surface Modulation Strategy.
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.
authors.affiliation: Hefei National Laboratory for Physical Sciences at the Microscale, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Hefei Science Center (CAS) and CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science & Technology of China, Hefei, 230026, PR China.
authors.forename: Jing
authors.initials: J
authors.lastname: Peng
authors.affiliation: Hefei National Laboratory for Physical Sciences at the Microscale, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Hefei Science Center (CAS) and CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science & Technology of China, Hefei, 230026, PR China.
authors.forename: Yuqiao
authors.initials: Y
authors.lastname: Guo
authors.affiliation: Hefei National Laboratory for Physical Sciences at the Microscale, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Hefei Science Center (CAS) and CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science & Technology of China, Hefei, 230026, PR China.|CAS Key Lab of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science & Technology of China, Hefei, 230026, PR China.
authors.forename: Haifeng
authors.initials: H
authors.lastname: Lv
authors.affiliation: Hefei National Laboratory for Physical Sciences at the Microscale, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Hefei Science Center (CAS) and CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science & Technology of China, Hefei, 230026, PR China.
authors.forename: Xinyu
authors.initials: X
authors.lastname: Dou
authors.affiliation: i-Lab, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, 215123, PR China.
authors.forename: Qi
authors.initials: Q
authors.lastname: Chen
authors.affiliation: Hefei National Laboratory for Physical Sciences at the Microscale, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Hefei Science Center (CAS) and CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science & Technology of China, Hefei, 230026, PR China.
authors.forename: Jiyin
authors.initials: J
authors.lastname: Zhao
authors.affiliation: Hefei National Laboratory for Physical Sciences at the Microscale, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Hefei Science Center (CAS) and CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science & Technology of China, Hefei, 230026, PR China. czwu@ustc.edu.cn.
authors.forename: Changzheng
authors.initials: C
authors.lastname: Wu
authors.affiliation: Hefei National Laboratory for Physical Sciences at the Microscale, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Hefei Science Center (CAS) and CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science & Technology of China, Hefei, 230026, PR China.
authors.forename: Xiaojiao
authors.initials: X
authors.lastname: Zhu
authors.affiliation: Hefei National Laboratory for Physical Sciences at the Microscale, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Hefei Science Center (CAS) and CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science & Technology of China, Hefei, 230026, PR China.
authors.forename: Yue
authors.initials: Y
authors.lastname: Lin
authors.affiliation: i-Lab, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, 215123, PR China.
authors.forename: Wei
authors.initials: W
authors.lastname: Lu
authors.affiliation: Hefei National Laboratory for Physical Sciences at the Microscale, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Hefei Science Center (CAS) and CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science & Technology of China, Hefei, 230026, PR China.|CAS Key Lab of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science & Technology of China, Hefei, 230026, PR China.
authors.forename: Xiaojun
authors.initials: X
authors.lastname: Wu
authors.affiliation: Hefei National Laboratory for Physical Sciences at the Microscale, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Hefei Science Center (CAS) and CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science & Technology of China, Hefei, 230026, PR China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Xie
keywords: magnetic properties; magnetoresistance; reduced graphene oxide; superparamagnetism; surface modulation