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Excitonic Photoluminescence of Ultra-Narrow 7-Armchair Graphene Nanoribbons Grown by a New “Bottom-Up” Approach on a Ni Substrate under Low Vacuum

2020; American Chemical Society; Volume: 124; Issue: 47 Linguagem: Inglês

10.1021/acs.jpcc.0c07369

1932-7455

Pavel V. Fedotov, Dmitry V. Rybkovskiy, A. I. Chernov, Ekaterina A. Obraztsova, Е. Д. Образцова,

Carbon Nanotubes in Composites

Compared to well-studied single-wall carbon nanotubes, narrow graphene nanoribbons (GNRs) are in shadow due to difficulties in their synthesis (necessity of ultra-high vacuum, noble-metal substrates, and tiny output yield). Here, we report a new approach to the bottom-up technique based on chemical vapor deposition to facilitate the synthesis of 7-armchair GNRs on a large scale under low vacuum on common Ni foil. The structure and high quality of produced GNRs are confirmed by multi-wavelength Raman. We demonstrate the characteristic optical absorption features of produced graphene nanoribbons at 2.05 and 2.22 eV associated with the E11 and E22 excitonic transitions of 7-armchair GNRs. The produced GNRs demonstrate bright photoluminescence (PL) in the red spectral range with the main characteristic feature at 2.04 eV associated with E11 exciton transition. We also measured the PL excitation spectral map that contains a diversity of spectrum features associated with 7-armchair GNRs. The presented results can be beneficial for further study of atomically precise GNRs, especially in nonlinear optics, and can be promising for applications of GNRs.