Guan Y C, Fang Y W, Lim G C, Zheng H Y, Hong M H
Beihang University, 37 Xueyuan Road, Beijing, 100191, China.
Singapore Institute of Manufacturing Technology, 71 Nanyang Drive, 638075, Singapore.
Sci Rep. 2016 Jun 27;6:28913. doi: 10.1038/srep28913.
Porous structure of reduced graphene oxide (rGO) plays an important role in developing flexible graphene-based devices. In this work, we report a novel methodology for reduction of freestanding graphite oxide (GO) sheet by picosecond pulse laser direct writing in liquid nitrogen. Non-agglomerate and porous structure of rGO is fabricated successfully due to frozen effect during laser processing. Compared with laser-irradiated rGO developed in N2 gas at ambient environment, the frozen rGO developed in liquid N2 shows better ordered structure with less defects, crack-free morphology as well as better electron supercapacitor performance including 50-60 Ω/sq in sheet electrical resistance. Mechanism of cryotemperature photoreduction GO is also discussed.
还原氧化石墨烯（rGO）的多孔结构在开发基于石墨烯的柔性器件中起着重要作用。在这项工作中，我们报道了一种通过在液氮中进行皮秒脉冲激光直写来还原独立氧化石墨烯（GO）片的新方法。由于激光加工过程中的冷冻效应，成功制备了rGO的非团聚且多孔的结构。与在环境气氛下于氮气中激光辐照制备的rGO相比，在液氮中制备的冷冻rGO显示出更好的有序结构、更少的缺陷、无裂纹形态以及更好的电子超级电容器性能，包括50 - 60Ω/sq的薄层电阻。还讨论了低温光还原GO的机理。
