【摘 要】
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The development of the preparation strategy for high-quality and large-size graphene via eco-friendly routes is still a challenging issue.Herein,we have successfully developed a novel route to chemi-cally exfoliate natural graphite into high-quality and l
【机 构】
：
State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao 0
论文部分内容阅读
The development of the preparation strategy for high-quality and large-size graphene via eco-friendly routes is still a challenging issue.Herein,we have successfully developed a novel route to chemi-cally exfoliate natural graphite into high-quality and large-size graphene in a binary-peroxidant sys-tem.This system is composed of urea peroxide (CO(NH2)2·H2O2) and hydrogen peroxide (H2O2),where CO(NH2)2·H2O2 is used in preparing graphene for the first time.Benefiting from the complete decom-position of CO(NH2)2 ·H2O2 and H2O2 into gaseous species under microwave (MW) irradiation,no water-washing and effluent-treatment are needed in this chemical exfoliation procedure,thus the preparation of graphene in an eco-friendly way is realized.The resultant graphene behaves a large-size,high-quality and few-layer feature with a yield of ～100％.Then 4 μm-thick ultrathin graphene paper fabricated from the as-exfoliated graphene is used as an electromagnetic interference (EMI) shielding material.And its absolute effectiveness of EMI shielding (SSE/t) is up to 34,176.9 dB cm2/g,which is,to the best of our knowledge,among the highest values so far reported for typical EMI shielding materials.The EMI shielding perfor-mance demonstrates a great application potential of graphene paper in meeting the ever-increasingly EMI shielding demands in miniaturized electronic devices.
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