Abstract
The on-surface synthesis method allows the fabrication of atomically precise narrow graphene nanoribbons (GNRs), which bears great potential in electronic applications. Here, we synthesize armchair graphene nanoribbons (AGNRs) and chevron-type graphene nanoribbons (CGNRs) array on a vicinal Au(11 11 12) surface using 10,10′-dibromo-9,9′-bianthracene (DBBA) and 6,12-dibromochrysene (DBCh) as precursors, respectively. This process creates spatially well-aligned GNRs, as characterized by scanning tunneling microscopy. AGNRs show strong Raman linear polarizability for application in optical modulation devices. Different from the distinct polarization of AGNRs, only weak polarization exists in CGNRs polarized Raman spectrum, which suggests that the presence of the zigzag boundary in the nanoribbon attenuates the polarization rate as an important factor affecting the polarization. We analyze the Raman activation mode of CGNRs using the peak polarization to expand the application of the polarization Raman spectroscopy in nanoarray analysis.
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