Incorporate boron and nitrogen into graphene to make BCN hybrid nanosheets with enhanced microwave absorbing properties
Incorporate boron and nitrogen into graphene to make BCN hybrid nanosheets with enhanced microwave absorbing properties
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将硼和氮掺入石墨烯中，制成具有增强微波吸收性能的BCN杂化纳米片
DOI：
10.1016/j.carbon.2013.04.085
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发表时间：
2013-09-01
期刊：
影响因子：
10.9
通讯作者：
Li, Xiaodong
中科院分区：
文献类型：
--
作者：
Kang, Yue;Chu, Zengyong;Li, Xiaodong
这项工作展示了氧化石墨烯在900℃下与硼酸和尿素反应生成BCN杂化纳米片的过程，在此过程中，硼和氮原子被引入到石墨烯原子片中。X射线衍射图和X射线光电子能谱证明了h-BN的存在。高分辨电子显微镜和拉曼光谱表明，存在具有h-BN纳米结构的石墨烯样层。BCN纳米片中h-BN的含量也可以通过在氨气环境中的进一步热处理来调节，这反过来又会影响这些纳米片的带隙。电磁参数表明，该样品在G波段(5.6-8.2 GHz)和X波段(8.2-12.4 GHz)具有良好的吸波性能。本研究为制备具有可调带隙和可调电导率的BCN杂化纳米片提供了一条简单的途径。(C)2013爱思唯尔有限公司。保留所有权利。
This work demonstrates the conversion of graphene oxide into BCN hybrid nanosheets by reaction with boric acid and urea at 900 degrees C, during which boron and nitrogen atoms are incorporated into the graphene atomic sheets. X-ray diffraction pattern and X-ray photoelectron spectroscopy reveal the existence of h-BN. High-resolution electron microscopy and Raman spectrum indicate the presence of graphene-like layers with h-BN nanodomains. The content of h-BN in the BCN nanosheets can also be tuned by further heat-treatment in an ammonia environment, which in turn affects the band gap of these nanosheets. The electromagnetic parameters suggest that these samples can be used as good microwave absorbing materials at G band (5.6-8.2 GHz) and X band (8.2-12.4 GHz). This study provides a simple route to BCN hybrid nanosheets with tunable band gap and adjustable conductivity for microwave absorbing applications. (C) 2013 Elsevier Ltd. All rights reserved.