Thermodynamic Study of Adsorption Capacity between Metal Film and Optical Crystal: Adsorption Energy of Ni Films on LiNbO3 Substrates

The growth of large areas of two-dimensional homogeneous graphene depends on the bond between the metal film, which acts as a catalyst, and the substrate material. The structural differences between the metal and the various anisotropic crystals make this growth method a challenge for the feasibilit...

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Bibliographic Details
Published in:Crystals (Basel) 2021-11, Vol.11 (11), p.1273
Main Authors: Xu, Yuhang, Lu, Fei, Liu, Kaijing, Ma, Changdong
Format: Article
Language:English
Subjects:
Adsorption
adsorption energy
Annealing
Carbon
Chemical vapor deposition
Crystal growth
Crystal structure
Decomposition
direct synthesis
Graphene
Heat treatment
High temperature
Ion implantation
LiNbO3 substrates
Lithium niobates
Methods
Ni films
Nickel
Substrates
Temperature dependence
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Summary:The growth of large areas of two-dimensional homogeneous graphene depends on the bond between the metal film, which acts as a catalyst, and the substrate material. The structural differences between the metal and the various anisotropic crystals make this growth method a challenge for the feasibility of growing graphene on optical crystals. In this paper, the evolution of the adsorption energy between nickel (Ni) films and Lithium Niobate (LiNbO3, LN) crystals is modelled under different thermal treatment environments by constructing a physical model of the temperature dependence of the adsorption energy between the two materials. With the aid of a series of simulated full annealing processes, the changes in adsorption energy at different temperatures were calculated. The results show that there are two “temperature windows” with target annealing temperatures of 700–800 K and 950–1050 K that prove to have high adsorption energies. This is of great guiding and practical significance for the direct transfer-free synthesis of graphene on LiNbO3 substrates.
ISSN:2073-4352
2073-4352
DOI:10.3390/cryst11111273