State Key Laboratory of New Ceramics & Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
1] State Key Laboratory of New Ceramics & Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China [2] Science and Technology on Surface Physics and Chemisty laboratory, Mianyang, 621907, China.
Sci Rep. 2014 Feb 5;4:3965. doi: 10.1038/srep03965.
Here we report a green and facile route for highly efficient reduction of free-standing graphene oxide (GO) papers with metal iodide aqueous solutions at low cost. The metal iodides (MgI2, AlI3, ZnI2, FeI2) were synthesized directly from metal and iodine powder with water as a catalyzer. An extremely high bulk conductivity of 55088 S/m for reduced graphene oxide (rGO) papers were obtained with FeI2 solution of which pH = 0 at 95°C for 6 hours. The catalytic effect of strong Lewis acid for the promotion of the nucleophilic substitution reaction is responsible for the greatly improved bulk conductivity. Furthermore, it was found that the layer-to-layer distance (dL) and the crystallinity of the rGO papers are regarded as two main factors affecting the bulk conductivity rather than C/O ratio and defect concentration.
在这里，我们报道了一种绿色且简便的方法，即用金属碘化物水溶液在低成本下高效还原独立式氧化石墨烯（GO）纸。金属碘化物（MgI2、AlI3、ZnI2、FeI2）直接由金属和碘粉与水作为催化剂合成。用 FeI2 溶液在 95°C 下反应 6 小时，可得到还原氧化石墨烯（rGO）纸的超高体电导率 55088 S/m，其 pH 值为 0。强路易斯酸的催化作用促进了亲核取代反应，从而大大提高了体电导率。此外，我们还发现 rGO 纸的层间距离（dL）和结晶度是影响体电导率的两个主要因素，而不是 C/O 比和缺陷浓度。
