Key Laboratory of Marine Materials and Related Technologies, Key Laboratory of Marine Materials and Protective Technologies of Zhejiang Province, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, P. R. China.
Nanoscale. 2017 Nov 9;9(43):16871-16878. doi: 10.1039/c7nr06667h.
Graphene nanosheets (GNSs) possess outstanding conductivity, good thermal and chemical stabilities and desirable mechanical strengths. However, the unfunctionalized GNSs are hydrophobic and insoluble in water, which limits their application in many technological areas. Herein, we report a design strategy to exfoliate few-layered aqueous dispersible graphene by a simple ball-milling technique. The modifier of sodium lignosulfonate (LS) enables to synthesize LS-decorated GNSs from natural graphite based on the strong π-π interaction, greatly improving GNSs dispersion in water. The resultant GNSs exhibit a high production yield (∼100%), high dispersion concentration and excellent film formation ability. The electrical and thermal conductivities of the as-prepared graphene paper were up to 2385 S cm and 1324 W m K, respectively, superior to those of most previously reported graphene materials. This graphene paper with the superb electrical and thermal conduction properties also exhibits excellent mechanical flexibility and structure intensity during bending, which has potential usages in electronic packaging and high power thermal management.
石墨烯纳米片（GNSs）具有出色的导电性、良好的热稳定性和化学稳定性以及理想的机械强度。然而，未经功能化的 GNSs 是疏水性的，不溶于水，这限制了它们在许多技术领域的应用。在此，我们报告了一种通过简单的球磨技术将少层可分散在水中的石墨烯剥离的设计策略。修饰剂木质素磺酸钠（LS）可以通过强π-π相互作用，从天然石墨合成 LS 修饰的 GNSs，从而极大地提高了 GNSs 在水中的分散性。所得到的 GNSs 表现出高的产率（~100%）、高的分散浓度和优异的成膜能力。所制备的石墨烯纸的电导率和热导率分别高达 2385 S cm 和 1324 W m K，优于大多数先前报道的石墨烯材料。这种具有优异电导率和热导率的石墨烯纸在弯曲时还表现出优异的机械柔韧性和结构强度，在电子封装和高功率热管理方面具有潜在的应用。
