Interface of Ionic Liquids and Carbon: Ultrathin [C1C1Im][Tf2N] Films on Graphite and Graphene
Interface of Ionic Liquids and Carbon: Ultrathin [C1C1Im][Tf2N] Films on Graphite and Graphene
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DOI：
10.1021/acs.jpcc.5b09649
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发表时间：
2015-12-17
影响因子：
3.7
通讯作者：
Maier, F.
中科院分区：
文献类型：
--
作者：
Rietzler, F.;Nagengast, J.;Maier, F.
研究了离子液体（IL）[C（1）C（1）Im] [Tf2N]薄膜在高有序热解石墨（HOPG）和Ni（111）表面完整石墨烯层和部分石墨烯层上的初始吸附行为和吸附量。我们发现，初始吸附行为和生长强烈依赖于底层衬底。在HOPG上，IL形成了覆盖率为0.5 ML的初始润湿层，并且阴离子和胼胝彼此相邻，与基材直接接触。在Ni（111）上的完整石墨烯层上，润湿层具有两倍的厚度，其中交替取向的离子对彼此相邻。在这些润湿层的顶部上，在3D岛中发生进一步的IL生长，其中：岛形成在石墨烯层上不太明显。在Ni（111）上的部分石墨烯层上，初始IL吸附优先发生在裸Ni表面区域上，阴离子在阳离子之上，随后在裸表面区域和石墨烯覆盖的表面区域上都发生3D岛状生长。
We investigated the initial adsorption behavior and gfowth of thin films of ionic liquid (IL) [C(1)C(1)Im] [Tf2N] on highly Ordered pyrolytic, graphite (HOPG) and on a full and a fractional graphene layer on Ni(111). We found that the initial adsorption behavior and growth strongly depended on the underlying substrate. On HOPG, the IL forms an initial wetting layer with a coverage of 0.5 ML and anions,and callous next to each other in direct contact with the substrate. On a complete graphene layer on Ni(111), the wetting layer has twice the thickness with alternately oriented ion pairs next to each other. On top of these wetting layers, further IL growth occurs in 3D islands, with:the island formation being less pronounced on the graphene layer. On the fractional graphene layer on Ni(111), initial IL adsorption preferentially occurs on bare Ni surface areas, with anions on top of cations, followed by 3D island growth on both the bare and the graphenecovered surface regions.