Fig. 1

Mass spectra of molecular bilayer graphenes. The mass spectra of 1 (a) and 2 (b) with different desorption laser powder. The insert figures represent the isotopic distribution for the mass peak of 1 and 2
Mass spectra of molecular bilayer graphenes. The mass spectra of 1 (a) and 2 (b) with different desorption laser powder. The insert figures represent the isotopic distribution for the mass peak of 1 and 2