Chengdu Green Energy and Green Manufacturing Technology R&D Center, CAEP Chengdu Development Center of Science and Technology, China.
Nanoscale. 2014 Jul 21;6(14):7877-88. doi: 10.1039/c3nr06056j.
A novel and highly conductive 3-dimensional (3D) hierarchical multi-scale structure is formed by a new, simple, facile, and water-based method that enables practical production of conductive carbon nanofiller/polymer composites. More specifically, the π-π interaction between CNTs and graphene oxide (GO) is exploited to disperse conductive but non-polar CNTs with amphiphilic GO sheets to form a stable aqueous colloidal solution. Aqueous-dispersible latex-polystyrene microspheres are then added to enable the self-assembly processes of anchoring CNTs on GO and wrapping microspheres with GO-stabilized CNTs for the formation of an intriguing 3D hierarchical multi-scale structure. During this process, GO is reduced to conductive reduced-graphene oxide (RGO). The resultant RGO sheets act as "nano-walls" to prevent CNTs from randomly diffusing into the polymer bulk during thermal pressing of RGO-CNT/microspheres, which results in the formation of a 3D foam-like network of RGO-CNTs with high quality. The resultant composite with such a structure gives an ultra-low percolation threshold (0.03 vol% RGO-CNTs) and a reasonably high conductivity (153 S m(-1) at 4 vol% RGO-CNTs), which could satisfy various applications requiring both transparency and electrical conduction characteristics (e.g. transparent antistatic coatings, capacitive touch-screens, and transparent electronic devices).
通过一种新颖、简单、易用且基于水的方法形成了一种新型的高度导电的 3D（三维）分层多尺度结构，该方法使导电碳纳米填料/聚合物复合材料的实际生产成为可能。更具体地说，利用 CNTs 和氧化石墨烯（GO）之间的π-π相互作用，将导电但非极性的 CNTs 分散在具有两亲性的 GO 片上，以形成稳定的水性胶体溶液。然后加入水性分散的乳胶-聚苯乙烯微球，以使 CNTs 在 GO 上的自组装过程和微球的 GO 稳定的 CNTs 包裹得以进行，从而形成引人入胜的 3D 分层多尺度结构。在此过程中，GO 被还原为导电的还原氧化石墨烯（RGO）。所得的 RGO 片作为“纳米壁”，在 RGO-CNT/微球的热压过程中防止 CNTs 随机扩散到聚合物基体中，从而形成具有高质量的 RGO-CNTs 的 3D 泡沫状网络。具有这种结构的复合材料具有超低的渗流阈值（0.03 体积% RGO-CNTs）和相当高的电导率（在 4 体积% RGO-CNTs 时为 153 S m(-1)），可以满足需要同时具有透明性和导电性的各种应用（例如，透明抗静电涂料、电容式触摸屏和透明电子设备）。
