Park Won Kyu, Yoon Yeojoon, Song Young Hyun, Choi Su Yeon, Kim Seungdu, Do Youngjin, Lee Junghyun, Park Hyesung, Yoon Dae Ho, Yang Woo Seok
School of Advanced Materials Science and Engineering, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do, 16419, Republic of Korea.
Electronic Materials and Device Research Center, Korea Electronics Technology Institute (KETI), 25 Saenari-ro, Bundang-gu, Seongnam-si, Gyeonggi-do, 13509, Republic of Korea.
Sci Rep. 2017 Nov 27;7(1):16414. doi: 10.1038/s41598-017-16649-y.
In this work, we introduce a novel and facile method of exfoliating large-area, single-layer graphene oxide using a shearing stress. The shearing stress reactor consists of two concentric cylinders, where the inner cylinder rotates at controlled speed while the outer cylinder is kept stationary. We found that the formation of Taylor vortex flow with shearing stress can effectively exfoliate the graphite oxide, resulting in large-area single- or few-layer graphene oxide (GO) platelets with high yields (>90%) within 60 min of reaction time. Moreover, the lateral size of exfoliated GO sheets was readily tunable by simply controlling the rotational speed of the reactor and reaction time. Our approach for high-efficiency exfoliation of GO with controlled dimension may find its utility in numerous industrial applications including energy storage, conducting composite, electronic device, and supporting frameworks of catalyst.
在这项工作中，我们介绍了一种利用剪切应力剥离大面积单层氧化石墨烯的新颖且简便的方法。剪切应力反应器由两个同心圆筒组成，其中内圆筒以可控速度旋转，而外圆筒保持静止。我们发现，具有剪切应力的泰勒涡旋流的形成能够有效地剥离氧化石墨，在60分钟的反应时间内以高产率（>90%）得到大面积的单层或少数层氧化石墨烯（GO）薄片。此外，通过简单地控制反应器的转速和反应时间，剥离的GO薄片的横向尺寸易于调节。我们这种对GO进行高效剥离并控制尺寸的方法可能在包括能量存储、导电复合材料、电子器件以及催化剂支撑框架等众多工业应用中找到其用途。
