Low temperature reduction of free-standing graphene oxide papers with metal iodides for ultrahigh bulk conductivity

Chenyang Liu; Feng Hao; Xiaochong Zhao; Qiancheng Zhao; Songping Luo; Hong Lin

doi:10.1038/srep03965

Low temperature reduction of free-standing graphene oxide papers with metal iodides for ultrahigh bulk conductivity

Sci Rep. 2014 Feb 5:4:3965. doi: 10.1038/srep03965.

Authors

Chenyang Liu¹, Feng Hao¹, Xiaochong Zhao², Qiancheng Zhao¹, Songping Luo¹, Hong Lin¹

Affiliations

¹ State Key Laboratory of New Ceramics & Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
² 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.

Abstract

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.

Publication types

Research Support, Non-U.S. Gov't