• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Chemistry: A European journal >Effects of heat treatment on raman spectra of two-layer (12)~C/ (13)~C graphene
【24h】

Effects of heat treatment on raman spectra of two-layer (12)~C/ (13)~C graphene

机译：热处理对两层（12）〜C /（13）〜C石墨烯拉曼光谱的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The Raman spectra of two-layered graphene on a silicon substrate were studied in the temperature range from 298 to 1073 K in an inert atmosphere. Isotopic engineering was used to fabricate two-layer graphene specimens containing (13)~C atoms in the top layer and (12)~C atoms in the bottom layer, which allowed the behavior of each particular layer to be distinguished as a function of temperature. It is demonstrated that the top layer exhibits much lower Raman temperature coefficients than the bottom one for both the G and the G' modes. We suggest that the changes in the Raman spectra of graphene observed during thermal cycling are predominantly caused by a superposition of two effects, namely, the mechanical stress in graphene exerted by the substrate and the intrinsic changes in the graphene lattice caused by the temperature itself. The top graphene layer is proposed to be more relaxed than the bottom graphene layer and thus reflects almost exclusively the temperature variations as a freestanding graphene layer would.
机译：在惰性气氛下，在298至1073 K的温度范围内，研究了硅基板上两层石墨烯的拉曼光谱。同位素工程被用于制造两层石墨烯样品，其顶层包含（13）〜C原子，底层包含（12）〜C原子，从而可以根据温度来区分每个特定层的行为。已经证明，对于G和G'模式，顶层呈现出比底层低得多的拉曼温度系数。我们认为，在热循环过程中观察到的石墨烯拉曼光谱的变化主要是由两种效应的叠加所引起的，即衬底所施加的石墨烯的机械应力和温度本身所引起的石墨烯晶格的固有变化。提出顶部石墨烯层比底部石墨烯层更松弛，因此几乎像独立式石墨烯层那样仅反映温度变化。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号