Unravelling the Complete Raman Response of Graphene Nanoribbons Discerning the Signature of Edge Passivation
Unravelling the Complete Raman Response of Graphene Nanoribbons Discerning the Signature of Edge Passivation
复制标题
揭示石墨烯纳米带的完整拉曼响应，识别边缘钝化的特征
DOI：
10.1002/smtd.202200110
复制
发表时间：
2022-06-22
期刊：
影响因子：
12.4
通讯作者：
Ayala, Paola
中科院分区：
文献类型：
--
作者：
Milotti, Valeria;Berkmann, Claudia;Ayala, Paola
Controlling the edge morphology and terminations of graphene nanoribbons (GNR) allows tailoring their electronic properties and boosts their application potential. One way of making such structures is encapsulating them inside single-walled carbon nanotubes. Despite the versatility of Raman spectroscopy to resolve strong spectral signals of these systems, discerning the response of long nanoribbons from that of any residual precursor remaining outside after synthesis has been so far elusive. Here, the terrylene dye is used as precursor to make long and ultra-narrow armchair-edged GNR inside nanotubes. The alignment and characteristic length of terrylene encapsulated parallel to the tube's axis facilitates the ribbon formation via polymerization, with high stability up to 750 degrees C when the hybrid system is kept in high vacuum. A high temperature annealing is used to remove the terrylene external molecules and a subtraction model based on the determination of a scaling factor related to the G-band response of the system is developed. This not only represents a critical step forward toward the analysis of the nanoribbon-nanotube system, but it is a study that enables unraveling the Raman signatures of the individual CH-modes (the signature of edge passivation) for GNR for the first time with unprecedented detail.
