Nano Carbon Materials Research Group, Korea Electrotechnology Research Institute (KERI), Changwon 641-120, Korea.
Small. 2012 Jan 23;8(2):272-80. doi: 10.1002/smll.201101696. Epub 2011 Nov 22.
Flexible field-emission devices (FEDs) based on reduced graphene oxide (RGO) emitters are fabricated by the thermal welding of RGO thin films onto a polymeric substrate. The RGO edges are vertically aligned relative to the substrate as a result of cohesive failure in the RGO layer after thermal welding. Even at large bending angles, excellent electron emission properties, such as low turn-on and threshold fields, a high emission current density, a high field enhancement factor, and long-term stability of the emission properties of RGO emitters, arise from the uniform distribution and high density of the extremely sharp RGO edges, as well as the high interfacial strength between the RGO emitters and the substrate. Al- and Au-doped RGO emitters are fabricated by introducing a dopant solution to the RGO emitters, and the resulting field-emission characteristics are discussed. The proposed approach is straightforward and enables the practical use of high-performance RGO flexible FEDs.
基于还原氧化石墨烯（RGO）发射器的柔性场发射器件（FED）是通过将 RGO 薄膜热焊接到聚合物基底上制造的。由于热焊接后 RGO 层中的内聚失效，RGO 边缘相对于基底垂直排列。即使在大弯曲角度下，RGO 发射器也具有出色的电子发射性能，如低开启和阈值场、高发射电流密度、高场增强因子以及 RGO 发射器发射性能的长期稳定性，这源于极其锋利的 RGO 边缘的均匀分布和高密度，以及 RGO 发射器与基底之间的高界面强度。通过向 RGO 发射器中引入掺杂溶液来制造 Al 和 Au 掺杂的 RGO 发射器，并讨论了由此产生的场发射特性。所提出的方法简单直接，可实现高性能 RGO 柔性 FED 的实际应用。
