[2D05-11] Surface Science (SS1) Physical Property

11:45 AM - 12:00 PM JST(2:45 AM - 3:00 AM UTC)

[2D10] Effect of interlayer interaction on hydrogen bubble formation in transition metal dichalcogenides

*Wei-Tung Liu¹, Tomo-o Terasawa^2,3, Chun-Liang Lin¹ (1. Department of Electrophysics, National Yang Ming Chiao Tung University, Hsinchu 300093, Taiwan. (Taiwan), 2. Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan. (Japan), 3. Institute of Industrial Science, The University of Tokyo, Meguro, Tokyo 153-8505, Japan. (Japan))

Here, hydrogen bubble formation in PtS₂ and MoS₂ was investigated using bulk crystals and few-layer TMD/Si samples subjected to hydrogen-ion irradiation. AFM measurements revealed bubbles in both few-layer and bulk MoS₂, consistent with its weak vdW interface, which facilitates lateral hydrogen migration and large-deformation. In contrast, PtS₂ showed a pronounced thickness dependence. Geometry-based analysis indicated that the nanoscale bubbles in bulk PtS₂ sustain approximately 3% tensile strain, while the strain in the larger few-layer blisters is negligible. These results demonstrate that hydrogen bubble morphology is determined not only by irradiation conditions but also by the intrinsic interlayer interaction of the host material and elastic relaxation. Stronger interlayer coupling suppresses hydrogen migration and delamination, producing localized high-strain bubbles, whereas weaker coupling promotes broader, dose-sensitive deformation.

Password required to view