Centre for Advanced Macromolecular Design, School of Chemical Sciences and Engineering, The University of New South Wales, Sydney, NSW 2052, Australia.
Langmuir. 2010 Jun 15;26(12):10068-75. doi: 10.1021/la1001978.
pH sensitive graphene-polymer composites have been prepared by the modification of graphene basal planes with pyrene-terminated poly(2-N,N'-(dimethyl amino ethyl acrylate) (PDMAEA) and poly(acrylic acid) (PAA) via pi-pi stacking. The pyrene-terminal PDMAEA and PAA were synthesized using reversible addition-fragmentation chain transfer (RAFT) polymerization with a pyrene-functional RAFT agent. The graphene-polymer composites were found to demonstrate phase transfer behavior between aqueous and organic media at different pH values. Atomic force microscopy (AFM) analysis revealed that the thicknesses of the graphene-polymer sheets were approximately 3.0 nm when prepared using PDMAEA (M(n): 6800 and PDI: 1.12). The surface coverage of polymer chains on the graphene basal plane was calculated to be 5.3 x 10(-11) mol cm(-2) for PDMAEA and 1.3 x 10(-10) mol cm(-2) for PAA. The graphene-polymer composites were successfully characterized using X-ray photoelectron spectroscopy (XPS), attenuated total reflection infrared (ATR-IR) spectroscopy, and thermogravimetric analysis (TGA). Self-assembly of the two oppositely charged graphene-polymer composites afforded layer-by-layer (LbL) structures as evidenced by high-resolution scanning electron microscopy (SEM) and quartz crystal microbalance (QCM) measurements.
通过π-π堆积，用芘末端的聚（2-N，N' - （二甲氨基）乙基丙烯酰胺）（PDMAEA）和聚丙烯酸（PAA）对石墨烯基面进行改性，制备了 pH 敏感的石墨烯-聚合物复合材料。芘末端的 PDMAEA 和 PAA 是通过可逆加成-断裂链转移（RAFT）聚合用芘功能化 RAFT 剂合成的。研究发现，在不同 pH 值下，石墨烯-聚合物复合材料在水相和有机相之间表现出相转移行为。原子力显微镜（AFM）分析表明，当使用 PDMAEA（M(n)：6800 和 PDI：1.12）制备时，石墨烯-聚合物片的厚度约为 3.0nm。聚合物链在石墨烯基面的表面覆盖率计算为 PDMAEA 为 5.3×10(-11)molcm(-2)，PAA 为 1.3×10(-10)molcm(-2)。使用 X 射线光电子能谱（XPS）、衰减全反射红外（ATR-IR）光谱和热重分析（TGA）成功地对石墨烯-聚合物复合材料进行了表征。两种带相反电荷的石墨烯-聚合物复合材料的自组装提供了层层（LbL）结构，这一点可以通过高分辨率扫描电子显微镜（SEM）和石英晶体微天平（QCM）测量得到证实。
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