Graphene Nanoribbons from Unzipped Carbon Nanotubes: Atomic Structures, Raman Spectroscopy, and Electrical Properties

详细信息    查看全文

• 作者：Liming Xie ; Hailiang Wang ; Chuanhong Jin ; Xinran Wang ; Liying Jiao ; Kazu Suenaga ; Hongjie Dai
• 刊名：Journal of the American Chemical Society
• 出版年：2011
• 出版时间：July 13, 2011
• 年：2011
• 卷：133
• 期：27
• 页码：10394-10397
• 全文大小：874K
• 年卷期：v.133,no.27(July 13, 2011)
• ISSN：1520-5126

文摘

We investigated the atomic structures, Raman spectroscopic and electrical transport properties of individual graphene nanoribbons (GNRs, widths 10鈥?0 nm) derived from sonochemical unzipping of multiwalled carbon nanotubes (MWNTs). Aberration-corrected transmission electron microscopy (TEM) revealed a high percentage of two-layer (2 L) GNRs and some single-layer ribbons. The layer鈥搇ayer stacking angles ranged from 0掳 to 30掳 including average chiral angles near 30掳 (armchair orientation) or 0掳 (zigzag orientation). A large fraction of GNRs with bent and smooth edges was observed, while the rest showed flat and less smooth edges (roughness 鈮? nm). Polarized Raman spectroscopy probed individual GNRs to reveal D/G ratios and ratios of D band intensities at parallel and perpendicular laser excitation polarization (D/D). The observed spectroscopic trends were used to infer the average chiral angles and edge smoothness of GNRs. Electrical transport and Raman measurements were carried out for individual ribbons to correlate spectroscopic and electrical properties of GNRs.