A Universal Method for the Preparation of Dual Network
Reduced Graphene Oxide-Ceramic/Metal Foam Materials with Tunable Porosity and
Improved Conductivity
Ge, Z (Ge, Zhen); Chen, HH (Chen, Honghui); Ren, YX (Ren, Yuxin); Xiao, PS (Xiao, Peishuang); Yang, Y (Yang, Yang); Zhang, TF (Zhang, Tengfei); Ma, YF(Ma, Yanfeng); Chen, YS (Chen, Yongsheng)[ 1 ]
CHEMISTRY OF MATERIALS, 2018, 30(22): 8368-8374
DOI: 10.1021/acs.chemmater.8b04081
WOS:000451789500029
Abstract
Inorganic
porous materials have found a great many applications in fields such as
filtration, catalysis, and so forth. However, most of these materials have been
prepared using complicated template and foaming methods and furthermore in many
cases suffer from low electrical and thermal conductivity. Herein, we developed
a universal and simple method for the synthesis of dual network reduced
graphene oxide-ceramic/metal foam materials from commercial powders directly
with graphene oxide as a 2D dispersant following a two-step process
(solvothermal and partial sintering). This approach leads to the formation of a
three-dimensional and interpenetrating dual network of both reduced graphene
oxide and inorganic material. Importantly, this method not only is rather
scalable but can also be applied universally for various ceramic materials,
such as Al2O3 and TiO2, and even metals such as Al and Cu. Furthermore, the
material's porosity can be controlled by varying sintering temperatures and
using different sizes of starting materials, ranging from several nanometers to
a dozen micrometers. Because of the dual network architecture of both reduced
graphene oxide and inorganic components, these materials exhibit multiple
functions such as high porosity, improved electrical conductivity, and so
forth. These results thus offer a general platform from various commercial
inorganic powder materials directly for preparing porous but mechanically
stable bulk materials, which are in high demand for catalysis, filtration,
conductive ceramic, and porous electrode materials.
