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Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems
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Visualizing Ribbon-to-Ribbon Heterogeneity of Chemically Unzipped Wide Graphene Nanoribbons by Silver Nanowire-Based
Tomoko Inose1, Shuichi Toyouchi2,3, Shinnosuke Hara4
1Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, iCeMS Research Bldg, Yoshida, Sakyo-ku, Kyoto, 606-8501, Japan.
Small (Weinheim an Der Bergstrasse, Germany)
|August 31, 2023
Summary
Chemical unzipping of double-walled carbon nanotubes yields high-quality graphene nanoribbons (GNRs). Tip-enhanced Raman spectroscopy reveals significant variations in GNR structure and defects, offering new insights into the fabrication process.
Area of Science:
- Materials Science
- Nanotechnology
- Chemistry
Background:
- Graphene nanoribbons (GNRs) are promising for nanoelectronics.
- Chemical unzipping of carbon nanotubes is a key fabrication method for GNRs.
- Double-walled carbon nanotubes (DWNTs) yield high-quality GNRs.
Purpose of the Study:
- To investigate the structure and reaction mechanism of GNRs produced from DWNTs.
- To analyze single GNRs using nanoscale spectroscopy.
- To understand ribbon-to-ribbon heterogeneity in GNRs.
Main Methods:
- Chemical unzipping of DWNTs.
- Silver nanowire-based tip-enhanced Raman spectroscopy (TERS) for single GNR analysis.
- Analysis of defect density and edge structure.
Main Results:
- GNRs from inner DWNT walls have lower defect densities than those from outer walls.
- TERS spectra show significant variations in graphitic Raman parameters, indicating diverse edge structures.
- Ribbon-to-ribbon heterogeneity in GNRs was observed at the single-nanoribbon level.
Conclusions:
- The study provides unprecedented single-GNR level insights into DWNT unzipping.
- Findings reveal heterogeneity in GNRs, crucial for understanding fabrication and optimizing properties.
- TERS analysis advances the understanding of GNR structure and reaction mechanisms.
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