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[资源] SCI REP-UK:一种通过氯化法将无定形碳化钛转化为石墨烯的方法

Graphene from Amorphous Titanium Carbide by Chlorination under 200 oC and Atmospheric Pressures
Tao Peng, Zongkui Kou, Hui Wu & Shichun Mu*
目前，石墨烯复杂的制备工艺和高昂的价格成为阻碍其产业化的最大瓶颈；同时，石墨烯制备过程中缺乏对石墨烯层数的精确调控也严重限制了其应用。前期，论文作者首次报道了采用氯化法在800℃、常压下可将无定形碳化硅（a-Si1-xCx）纳米薄膜转化为石墨烯（Scientific Reports, 2013, 3, 1148，下载见附件2）。在此基础上，他们进一步采用比a-Si1-xCx更活泼的无定形碳化钛（a-Ti1-xCx）作为石墨烯的前驱体，仅在200℃温度条件下就可快速将a-Ti1-xCx纳米薄膜转化为石墨烯。而且，通过改变处理温度可以使石墨烯的层数得到有效的调控。此外，他们还探讨了石墨烯层数与无定形TiC纳米薄膜基底尺寸的关系，证明采用更大尺度的基底依然能在较低温下得到层数可控的石墨烯。该方法具有在无基底或任意基底上大面积合成层数可控石墨烯的巨大潜力。
The synthesis of graphene via decomposition of SiC has opened a promising route for large-scale production of graphene. However, extremely high requirements for almost perfectly ordered crystal SiC and harsh process conditions such as high temperatures (.12006C) and ultra-high vacuum are two significant challenges hindering its wide use to synthesize graphene by decomposition of SiC. Here, we show that the readily available precursor of carbides, amorphous TiC (a-Ti1-xCx), can be transformed into graphene nanosheets (GNS) with tunable layers by chlorination method at very low temperatures (2006C) and ambient pressures. Moreover, freestanding GNS can be achieved by stripping off GNS from the surface of resulting particles. Therefore, our strategy, the direct transformation of a-Ti1-xCx into graphene, is simple and expected to be easily scaled up.

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附件 1 : Graphene_from_Amorphous_Titanium_Carbide_by_Chlorination_under_200℃_and_Atmospheric_Pressures.pdf

2014-07-06 14:49:59, 3.55 M