Department of Materials Science and Engineering, National Tsing-Hua University, Hsinchu 300, Taiwan, Republic of China.
Nanotechnology. 2011 Jul 22;22(29):295606. doi: 10.1088/0957-4484/22/29/295606. Epub 2011 Jun 17.
We report a facile method of preparing few-layer graphene nanosheets (FLGs), which can be soluble in ethanol. Atomic force microscopy and high-resolution transmission electron microscopy studies reveal that FLGs have average thicknesses in the range of 2.6-2.8 nm, corresponding to 8-9 layers. A graphene/nafion composite film has a sheet resistance of 9.70 kΩ/sq at the transmittance of 74.5% (at 550 nm) while the nafion film on polyethylene terephthalate has a sheet resistance of 128 kΩ/sq at transmittance of 90.0%. For the cycling/bending test, almost no change in resistance was exhibited when the film was bent at an angle up to 140°, and no obvious deviation in resistance could be found after 100 bending cycles was applied. In addition, an FLGs-poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) composite layer was demonstrated as the effective hole transporting layer to improve the hole transporting ability in an organic photovoltaic device, with which the power conversion efficiency was enhanced from 3.10% to 3.70%. The results demonstrated the promising applications of FLGs on graphene-based electronics, such as transparent electrode and flexible conducting film.
我们报告了一种制备少层石墨烯纳米片（FLGs）的简便方法，该方法可使 FLGs 溶解于乙醇中。原子力显微镜和高分辨率透射电子显微镜研究表明，FLGs 的平均厚度在 2.6-2.8nm 范围内，对应于 8-9 层。在透光率为 74.5%（在 550nm 处）时，石墨烯/纳滤复合膜的方阻为 9.70kΩ/sq，而聚对苯二甲酸乙二醇酯上的纳滤膜的方阻为 128kΩ/sq，透光率为 90.0%。对于循环/弯曲测试，当膜弯曲角度达到 140°时，电阻几乎没有变化，并且在施加 100 次弯曲循环后，电阻没有明显偏差。此外，FLGs-聚（3,4-亚乙基二氧噻吩）：聚（苯乙烯磺酸盐）复合材料层被证明为有效的空穴传输层，以提高有机光伏器件中的空穴传输能力，从而将功率转换效率从 3.10%提高到 3.70%。结果表明，FLGs 在基于石墨烯的电子学中的应用具有广阔的前景，例如透明电极和柔性导电膜。
