Journal
ACS NANO
Volume 8, Issue 11, Pages 11622-11630Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn5049014
Keywords
graphene nanoribbon; cyclodehydrogenation; Diels-Alder reaction; band-gap engineering; near-infrared absorption
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Funding
- European Research Council
- DFG [SPP 1459]
- Graphene Flagship [CNECT-ICT-604391]
- European Union
- Humboldt Foundation
- Villum Foundation [VKR023122]
- Villum Fonden [00007271] Funding Source: researchfish
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Structurally defined, long (>100 nm), and low-band-gap (similar to 1.2 eV) graphene nanoribbons (GNRs) were synthesized through a bottom-up approach, enabling GNRs with a broad absorption spanning into the near-infrared (NIR) region. The chemical identity of GNRs was validated by IR, Raman, solid-state NMR, and UV-vis-NIR absorption spectroscopy. Atomic force microscopy revealed well-ordered self-assembled monolayers of uniform GNRs on a graphite surface upon deposition from the liquid phase. The broad absorption of the low-band-gap GNRs enables their detailed characterization by Raman and time-resolved terahertz photoconductivity spectroscopy with excitation at multiple wavelengths, including the NIR region, which provides further insights into the fundamental physical properties of such graphene nanostructures.
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