Synthesis and Characterization of MXene/Graphene Composite with Porous Structure
Typ
Examensarbete för masterexamen
Program
Publicerad
2021
Författare
Chen, Ruiqi
Kang, Jincheng
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
Two-dimensional (2D) nanomaterials for example graphene have become a versatile
platform for the fabrication of innovative hybrid materials with various functions
due to their unique electrical, optical, thermal, and mechanical properties. Combining
graphene with other materials to prepare composites with nanoscale precision
is highly important and desirable for reproducible and controllable performance
through self-assembling. However, in order to fabricate composite materials with
unique structures for example porous structure using 2D materials, the restacking
and aggregation issues need to be addressed. In this project, a self-assembled MXene/
graphene composites with controllable porous structure were prepared using ice
as template. The addition of graphene plays an important role on the formation of
MXene based porous structure with well-defined and interconnected network. The
evolution of the nanostructure of the MXene/graphene composites was controlled
by varying the weight ratio between graphene and MXene. Various characterization
methods, for example, SEM, EDX, XRD, Raman, and FTIR were then used
to understand the structure–property relationships of the porous composites. From
the 4-point probe measurements, we found that although the graphene can facilitate
the formation of porous structure, the electrical conductivity of the porous MXene/-
graphene composites decreased as more graphene was added. Therefore, the ratio
between graphene and MXene need to be balanced in order to obtain the composites
with both high porous structure and high conductivity. Such simple freeze-drying
method could not only allow us to prevent the serious aggregation of 2D material
during self-assembling, but also prepare composite with unique structures in large
scale.
Beskrivning
Ämne/nyckelord
Graphene , MXene , porous structure , freeze-drying , energy storage