【作者】 廖磊； 周琳； 谢芹； 郭雪峰； 刘忠范；

【Author】 Lei Liao;Lin Zhou;Qin Xie;Xuefeng Guo;Zhongfan Liu;College of Chemistry and Molecular Engineering,Peking University;

【机构】 北京大学纳米化学研究中心,北京大学化学与分子工程学院；

【摘要】 石墨烯的化学修饰,尤其是共价修饰,是调控石墨烯性能的有效手段。然而,石墨烯的大共轭结构增加了其参加化学反应的能垒,极大地限制了反应的进行。目前仅有少数几种方法能够实现石墨烯的化学修饰,并且这些方法大多是随机或者是损伤性的,不利于石墨烯性能的调节。因此发展一种可控的修饰石墨烯的方法十分必要。我们报道了一种应力诱导的石墨烯的化学修饰方法,并且利用这种方法可控的制备了石墨烯的周期性结构。实验结果和理论计算均表明压缩应力会极大地增加石墨烯化学活性。我们通过将石墨烯转移到周期性的基底上来向石墨烯上引入周期性应力,并对其进行化学修饰,成功地实现了石墨烯的周期性修饰。我们认为这样一种应力诱导的化学反应提供了一种可控的修饰石墨烯的方法,为石墨烯在光学器件以及传感器件等领域的应用提供帮助。更多还原

【Abstract】 Chemical modification is efficient to tune the band structure of graphene. Only a few species with high reactivity could react with graphene because of the high energy barrier of the reaction. Furthermore, these species react randomly with graphene and/or damage the main structure of graphene, potentially lowering the electrical properties. Thus, an efficient methodology for gaining selective modification of graphene in a controllable way is desirable. Here, we reported a controllable method to realize periodic chemical modification of graphene via the strain-induced localized reactivity. We first performed the DFT simulation, which demonstrated that graphene with the higher compress strain showed higher reactivity because the energy barrier of the strained area was much lower than that of the flat area. To experimentally prove the hypothesis, we developed an approach to introduce a periodic strain by transferring CVD-grown graphene onto a substrate with designed periodic patterns. Comprehensive characterizations including SEM, Raman spectroscopy, AFM and EFM confirmed that periodic modification was achieved after the chemical reaction. We believe that this universal methodology obviously provides new opportunities to modify graphene, which opens up an avenue of applications toward functional optoelectronic devices and sensors.更多还原