Abstract
We show formation of paperlike thin films (Buckypaper) consisting of pseudo-two-dimensional network of individual boron-doped single-walled carbon nanotubes (B-SWNTs), by sufficiently dissolving as-grown ropes of SWNTs and densely assembling them on silicon substrate. We find superconducting transition at temperature $({T}_{\text{c}})$ of 8 K under absent pressure and that it can be induced as large as 2.4 times up to 19 K by applying a small pressure of 20 MPa. A significant frequency increase in the radial breathing phonon mode (RBM) is also found with applying pressure in Raman spectrum measurements. Moreover, B-SWNTs with a diameter of 0.6 nm are confirmed in the Buckypaper. These imply the strong correlation of the pressure-induced ${T}_{\text{c}}$ with electron-phonon (RBM) coupling of 0.6-nm-diameter B-SWNTs.
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