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Layer Worcester_Polytechnic_Institute dichalcogenide TCS Composition Force-distance Sphere Friction FrictionalForce 3-hexylthiophene molecule suspended_graphene UTEM exfoliate C_AFM CompactDisk Hafnia PvdfBead HiVacuum ULCA doped Annealed PDMS KelvinProbeForceMicroscopy SAM CP-AFM Vacuum #EC Heat EvatecAG CuParticle single_layer Techcomp SingleCrystal mfm_amplitude