聚苯胺嵌入氧化石墨复合物的合成及表征

近年来,聚苯胺类导电高分子嵌入无机片层化合物的报道日趋增加.这些材料中,由于无机/有机的纳米复合,一方面使无机材料的传输性能,如导电性等有极大改善,同时也使该类材料的电化学性能有极大的提高.因此对这类纳米复合材料的研究越来越为广大科研工作者所重视1～8].作为一种二维的层状化合物,氧化石墨层间大量极性基团的存在虽然赋予了氧化石墨丰富的嵌入化学(Ｉｎｔｅｒｃａｌａｔｅｃｈｅｍｉｓｔｒｙ)7～11],但在一定程度上也破坏了原石墨的晶体结构,致使其导电率大大降低(接近非导体).因此,如何以常用的纳米复合技术实现氧化石墨(ＧＯ…

SYNTHESIS AND CHARACTERIZATION OF POLYANILINE INTERCALATED GRAPHITE OXIDE COMPOSITE

Several methods were chosen to try to synthesis polyaniline(PAn)\|graphite oxide (GO) composites in this paper. It was experimentally shown aniline could be easily inserted into GO layers, however, lower oxidative potential could not oxidatively polymerize the intercalated aniline to form polyaniline intercalated graphite oxide nanocomposite(Comp.Ⅱ). And also, when aliline intercalated GO was externally oxidized by aqueous FeCl\-3 or (NH\-4)\-2S\-2O\-8/HCl, a polyaniline encapsulated GO composite (Comp.I) could be only obtained. But when an exfoliation/absorption process was used, where polyaniline was \%in situ \% polymerized in exfoliated GO suspension, Comp.Ⅱ could be obtained. Otherwise, XRD, FT\|IR and DSC were used to characterize these composites. XRD measurements indicated the I \-C value of comp.Ⅱ increased from 7.62nm of GO to 1.78 nm, which suggests that there exists a single layer or/and bilayer of PAn chain in the GO layer. Data of FT\|IR measurement indicated the co\|existence of GO and Emeraldine Salt in the polymer intercalated GO, very likely accompanied by an existence of Emeraldine Base. Thermal analysis also showed that the thermal behaviors of Comp.Ⅱ were different from those of Comp.Ⅰ. And contrast to pristine GO, these two composites had a higher electrical conductivity σ , but Comp. Ⅱ had a much higher σ value than Comp.Ⅰ.due to the synergies of polyaniline and graphite oxide in Comp.Ⅱ, especially the chemically reduced Comp.Ⅱ, mainly due to a reduction of GO. It was shown by a four\|probe contact that the σ value of Comp.Ⅱ and the reduced Comp.Ⅱ was 1.45×10 -3 S/cm and 3 73×10 -2 S/cm, respectively.