Structurally defined graphene nanoribbons with high lateral extension

Area of Science:

• Materials Science
• Organic Chemistry
• Nanotechnology

Background:

• Bottom-up synthesis of graphene nanoribbons (GNRs) is crucial for tailored electronic properties.
• Achieving controlled widths in GNRs remains a significant challenge in materials science.

Purpose of the Study:

• To develop a bottom-up strategy for synthesizing structurally defined graphene nanoribbons (GNRs) with unprecedented width.
• To investigate the efficiency of oxidative cyclodehydrogenation for GNR formation.

Main Methods:

• Oxidative cyclodehydrogenation of laterally extended polyphenylene precursors.
• Characterization using MALDI-TOF MS, FT-IR, Raman, and UV-vis absorption spectroscopies.
• Analysis of a representative model system to validate the cyclodehydrogenation efficiency.

Main Results:

• Successful bottom-up synthesis of structurally defined graphene nanoribbons (GNRs) with unprecedented width.
• Validation of cyclodehydrogenation efficiency through multiple spectroscopic techniques.
• Produced GNRs exhibit broad absorption extending to the near-infrared region.

Conclusions:

• Oxidative cyclodehydrogenation is an effective method for synthesizing wide, structurally defined GNRs.
• The synthesized GNRs possess an optical band gap as low as 1.12 eV, suitable for near-infrared applications.
• This approach offers a pathway for precise control over GNR width and properties.