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Superparamagnetic Reduced Graphene Oxide with Large Magnetoresistance: A Surface Modulation Strategy
Author(s) -
Peng Jing,
Guo Yuqiao,
Lv Haifeng,
Dou Xinyu,
Chen Qi,
Zhao Jiyin,
Wu Changzheng,
Zhu Xiaojiao,
Lin Yue,
Lu Wei,
Wu Xiaojun,
Xie Yi
Publication year - 2016
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201511436
Subject(s) - graphene , superparamagnetism , materials science , magnetoresistance , spintronics , oxide , nanotechnology , magnetism , modulation (music) , magnetic field , chemical engineering , condensed matter physics , ferromagnetism , magnetization , metallurgy , physics , quantum mechanics , acoustics , engineering
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.