Fig. 1: Materials and characterizations.
From: Anomalous isotope effect on mechanical properties of single atomic layer Boron Nitride
a Optical microscopy image of a 1 L 11BN on a SiO2/Si substrate with micro-wells of 1.6 μm in diameter. b repulsive tapping mode AFM image of the 11BN sheet marked in the square of (a). c The corresponding height trace of the dashed line in (b). d NEXAFS spectra at the B K-edge region of the isotopic BN materials. e comparison of the Raman spectra of suspended 10BN, NatBN, and 11BN monolayers (darker color) and their bulks crystals (lighter color and at ~1/50 intensity). f Raman frequency dependence on 10B concentration. Scale bars 5 μm in (a) and 2 μm in (b).
