功能化石墨烯片-聚丙烯酰胺复合材料的合成与表征
Investigations on synthesis and characterization of functionalized graphene sheets-polyacrylamide composites
摘要：
采用溶液浇铸法制备了功能化石墨烯片（FGS）-聚丙烯酰胺（PAM）复合膜.通过氧化石墨的热剥离合成了FGS。制备了几种不同FGS含量（0 ~ 25wt%）的复合材料，并用XRD、SEM、TEM和FTIR等手段进行了表征。红外光谱分析表明，聚合物链与氧化石墨烯片之间存在酰胺键（-NHC= O）。采用低温直流电导率测试和纳米压痕技术研究了FGS-PAM复合膜的电学和力学性能。在15wt%的FGS在PAM中的负载下观察到电导率和机械性能（硬度和弹性模量）的显著增加。随着FGS负载量从0增加到25wt%，复合膜的电导率增加了7个数量级（~5.55x10-7到1.42S/cm）。FGS（~ 15wt%）PAM膜的硬度和弹性模量分别比PAM膜提高了4倍和5倍。据我们所知，FGS-PAM复合材料的研究以及电性能和机械性能的改善尚未进行。
英文摘要：
The functionalized graphene sheets (FGS)-polyacrylamide (PAM) composite films have been prepared by solution cast technique. The FGS have been synthesized by thermal exfoliation of graphite oxide. Several composites with different weight % (between 0 to 25 wt %) of FGS loading in PAM have been prepared and characterized by XRD, SEM, TEM and FTIR spectroscopy. FTIR analysis revealed the existence of the amide linkage (-NHC= O) between the polymer chain and oxygenated graphene sheets. The electrical and mechanical properties of FGS-PAM composite films have been studied by employing low temperature dc electrical conductivity measurement and nanoindentation technique. A significant increase in both electrical conductivity and mechanical properties (hardness and elastic modulus) is observed at 15 wt% loading of FGS in PAM. As the FGS loading increases from 0 to 25 wt% the conductivity of composite film increases by seven orders of magnitude (~5.55x10-7 to 1.42 S/cm). The hardness and elastic modulus of FGS (~15 wt%)PAM film increased four and five fold, respectively as compared to that of PAM film. To our knowledge studies on FGS-PAM composites and also improvement of both the electrical and mechanical properties have not yet been made.
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