Inkjet printing ultra-large graphene oxide flakes
Inkjet printing ultra-large graphene oxide flakes
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DOI：
10.1088/2053-1583/aa629e
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发表时间：
2017-06-01
期刊：
影响因子：
5.5
通讯作者：
Derby, Brian
中科院分区：
文献类型：
--
作者：
He, Pei;Derby, Brian
可以喷墨打印平均薄片直径为36 μ m的氧化石墨烯2D材料油墨，尽管平均薄片尺寸大于打印机喷嘴直径的50%，并且包含单个薄片的油墨显著大于喷嘴，但打印机没有明显堵塞或薄片明显损坏。印刷的薄片显示出与在通过滴铸沉积的薄片中观察到的类似水平的褶皱和折叠缺陷。在打印之前，打印头中的油墨的偏振光成像示出了剪切流中的薄片的对齐，并且据信这允许通过而不附聚或阻塞喷嘴。这些超大片印刷膜的体电导率在还原后为2.48 X 10（4）Sm-1，这与印刷的原始石墨烯的体电导率相当。印刷膜的电导率随着薄片尺寸的增加而略微增加，这表明当薄片接近和超过喷嘴直径时，对电性能的损害没有增加。
Graphene oxide 2D materials inks with mean flake diameter 36 mu m can be inkjet printed, with no significant blockage of the printer or apparent damage to the flakes, despite the mean flake size being >50% of the printer nozzle diameter and the ink containing individual flakes considerably larger than the nozzle. Printed flakes show a similar level of wrinkle and fold defects as observed in flakes deposited by drop casting. Polarised light imaging of the ink in the printhead prior to printing shows alignment of the flakes in the shear flow and this is believed to allow passage without agglomeration or blocking of the nozzle. The bulk electrical conductivity of these ultra-large flake printed films is 2.48 x 10(4) Sm-1 after reduction, which is comparable to that reported with printed pristine graphene. The conductivity of the printed films increases slightly with increasing flake size indicating that there is no increase in damage to electrical properties as the flakes approach and exceed the nozzle diameter.