Fig. 5: Synthesis of nanographenes 3 on Si/SiO2 interface induced by atomic hydrogen.
From: Cyclodehydrogenation of molecular nanographene precursors catalyzed by atomic hydrogen
a Schematic view of nanographenes 3 on Si/SiO2. b ToF-SIMS spectra with C66H24 (nanographene 3) and C66H36 (precursor 6) mass regions marked by transparent red and blue, respectively, colored spectra: violet – reference obtained for clean Si/SiO2, dark blue –precursors 6 deposited on Si/SiO2, blue – precursors 6 on Si/SiO2 after annealing at 190 °C, green – mixture of precursors 6 and nanographenes 3 on Si/SiO2, after annealing at 190 °C with atomic hydrogen, black – nanographenes 3 present on the surface after atomic hydrogen treatment at 190 °C and subsequent annealing at 240 °C. c Static ToF-SIMS performed on a Si/SiO2 sample containing precursors 6 showing C66H36 (precursor 6, mass 828.286 g mol−1 – violet) and C66H24 (mass 816.134 g mol−1 – red) signals displayed as a function of temperature. d Mass spectra from (c) integrated from room temperature up to 210 °C showing presence of precursors 6. e Mass spectra from (c) integrated from 210 up to 400 °C indicating presence of nanoflakes 3. In (c) data point – to – point normalized to the reference experiment conducted with the same primary ion dose density at room temperature. Light violet in molecular schemes marks hexagonal rings present in molecular precursors 6 (C66H36), whereas dark violet in 3 (C66H24) indicates rings generated through hydrogen catalyzed cyclodehydrogenation. Source data are provided as a Source Data file.
