“…4 Roll-up nanotechnology has been proven as a convenient approach to fabricate micro/nanotubes, as reported previously. [5][6][7][8][9] By releasing the built-in mechanical stress, the rolling-up process induces the curving of the original flat films, thus resulting in the change of their strain status 10 in the rolled-up geometry 11 (SiGe/Si tubes or III-V tubes), which have been confirmed by micro-Raman scattering, 12 X-ray microdiffractions, 10,13,14 and photoluminescence spectroscopy. 15 Meanwhile, physical properties of semiconductor nanomembranes (NMs), 16,17 such as band structures, 18,19 and carrier mobilities, 20 could be altered by the intrinsic strain/stress.…”