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Adhesion of two-dimensional titanium carbides (MXenes) and graphene to silicon
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Adhesion of two-dimensional titanium carbides (MXenes) and graphene to silicon
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Journal Article
Adhesion of two-dimensional titanium carbides (MXenes) and graphene to silicon
2019
Overview
Two-dimensional transition metal carbides (MXenes) have attracted a great interest of the research community as a relatively recently discovered large class of materials with unique electronic and optical properties. Understanding of adhesion between MXenes and various substrates is critically important for MXene device fabrication and performance. We report results of direct atomic force microscopy (AFM) measurements of adhesion of two MXenes (Ti
3
C
2
T
x
and Ti
2
CT
x
) with a SiO
2
coated Si spherical tip. The Maugis-Dugdale theory was applied to convert the AFM measured adhesion force to adhesion energy, while taking into account surface roughness. The obtained adhesion energies were compared with those for mono-, bi-, and tri-layer graphene, as well as SiO
2
substrates. The average adhesion energies for the MXenes are 0.90 ± 0.03 J m
−2
and 0.40 ± 0.02 J m
−2
for thicker Ti
3
C
2
T
x
and thinner Ti
2
CT
x
, respectively, which is of the same order of magnitude as that between graphene and silica tip.
The adhesion of two-dimensional transition metal carbides (MXenes) is important for potential MXene device fabrication and performance. Here, the authors show that adhesion of MXenes depends on their monolayer thickness and, in contrast to graphene, does not show number-of-monolayers dependency.
