Thermally enhanced optical contrast of graphene oxide for thickness identification
Thermally enhanced optical contrast of graphene oxide for thickness identification
复制标题
用于厚度识别的氧化石墨烯的热增强光学对比度
DOI：
10.1088/1361-6528/ab1780
复制
发表时间：
2019
期刊：
影响因子：
3.5
通讯作者：
Zhenhua Ni
中科院分区：
文献类型：
--
作者：
Xitao Guo;Jinhuan Li;Yuanfang Yu;Amina Zafar;Zhenhua Ni
我们提出了一种简单，但快速，准确的方法来识别氧化石墨烯（GO）的层数通过使用其热增强的光学对比度，通过真空加热。正如预期的那样，在热处理后，已经观察到材料的厚度和化学结构的变化，这可以归因于插层水和氧含量的量的减少。这导致接近本征石墨烯的值的折射率和吸收系数的增加。最后，我们实现了一个几乎完全恢复的光学对比度的GO相比，石墨烯。该方法将适合于大规模生产的GO的厚度识别，因为它可以极大地促进样品评估和操作，并提供即时反馈以改进合成和加工策略。
We present a simple, but rapid and accurate approach to identify the layer number of graphene oxide (GO) by using its thermally enhanced optical contrast via vacuum heating. As expected, changes have been observed both in the thicknesses and chemical structures of the material upon the thermal treatment, which can be attributed to the reduction of the amount of intercalated water and oxygen content. This results in the increase of refractive index and absorption coefficient approaching the values for intrinsic graphene. Finally, we achieve an almost complete recovery of optical contrast of GO compared with the one of graphene. The method would be made suitable for the thickness identification of mass-produced GO since it can greatly facilitate sample evaluation and manipulation, and provide immediate feedback to improve synthesis and processing strategies.