Recently, two-dimensional transition metal carbides and graphene have been
widely used in wearable pressure sensors as representative two-dimensional
nanomaterials. Here, we discuss the wearable pressure sensors based on these
two-dimensional nanomaterials.
Two-dimensional transition metal carbides
Since the synthesis of two-dimensional Ti
3
C
2
T
x
in 2011, two-dimensional
transition metal carbides have been widely used in electrochemical energy
storage,
[60]
transparent electrode materials,
[61]
and nanocomposites.
[62,63]
Two-dimensional transition metal carbides are two-dimensional layered
structure with large specific surface areas and high electrical conductivity
values. Because of the excellent hydrophilicity and metal conductivity, two-
dimensional transition metal carbides are currently promising alternatives
to piezoresistive sensors and may provide excellent sensing performance.
Yue et al.
[38]
produced a two-dimensional transition metal carbide-
sponge through a simple and effective dip-coating process, which is applied
to piezoresistive sensors with insulated polyvinyl alcohol nanowires as the
interval, as shown in Figure 1. The two-dimensional transition metal
Figure 1. (a) Schematic illustration of the fabrication procedure of the MXene-sponge. (b and
c) Schematic illustration of the fabrication of the MXene-sponge/PVA NW based sensor.
Reproduced with permission from reference
[38]
(Yue et al. 2018) by Elsevier.
4 R. LIU ET AL.