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题名: Vertical Single-Crystalline Organic Nanowires on Graphene: Solution-Phase Epitaxy and Optical Microcavities
作者: Zheng, Jian-Yao1, 3, 4; Xu, Hongjun1, 3, 4; Wang, Jing Jing3, 4; Winters, Sinead2, 3, 4; Motta, Carlo1, 3, 4; Karademir, Ertugrul1, 3, 4; Zhu, Weigang5; Varrla, Eswaraiah1, 3, 4, 8; Duesberg, Georg S.2, 3, 4; Sanvito, Stefano1, 3, 4; Hu, Wenping5, 6, 7; Donegan, John F.1, 3, 4
关键词: Vertical ; organic nanowire ; graphene ; solution ; van der Waals epitaxy ; optical microcavity
刊名: NANO LETTERS
发表日期: 2016-08-01
卷: 16, 期:8, 页:4754-4762
收录类别: SCI
英文摘要: Vertically aligned nanowires (NWs) of single crystal semiconductors have attracted a great deal of interest in the past few years. They have strong potential to be used in device structures with high density and with intriguing optoelectronic properties. However, fabricating such nanowire structures using organic semiconducting materials remains technically challenging. Here we report a simple procedure for the synthesis of crystalline 9,10-bis(phenylethynyl) anthracene (BPEA) NWs on a graphene surface utilizing a solution-phase van der Waals (vdW) epitaxial strategy. The wires are found to grow preferentially in a vertical direction on the surface of graphene. Structural characterization and first-principles ab initio simulations were performed to investigate the epitaxial growth and the molecular orientation of the BPEA molecules on graphene was studied, revealing the role of interactions at the graphene BPEA interface in determining the molecular orientation. These free-standing NWs showed not only efficient optical waveguiding with low loss along the NW but also confinement of light between the two end facets of the NW forming a microcavity Fabry-Perot resonator. From an analysis of the optical dispersion within such NW microcavities, we observed strong slowing of the waveguided light with a group velocity reduced to one-tenth the speed of light. Applications of the vertical single crystalline organic NWs grown on graphene will benefit from a combination of the unique electronic properties and flexibility of graphene and the tunable optical and electronic properties of organic NWs. Therefore, these vertical organic NW arrays on graphene offer the potential for realizing future on-chip light sources.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.iccas.ac.cn/handle/121111/35344
Appears in Collections:有机固体实验室_期刊论文

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作者单位: 1.Trinity Coll Dublin, Sch Phys, Dublin 2, Ireland
2.Trinity Coll Dublin, Sch Chem, Dublin 2, Ireland
3.Trinity Coll Dublin, CRANN, Dublin 2, Ireland
4.Trinity Coll Dublin, Adv Mat & BioEngn Res Ctr AMBER, Dublin 2, Ireland
5.Chinese Acad Sci, Inst Chem, Key Lab Organ Solids, Beijing 100190, Peoples R China
6.Tianjin Univ, Sch Sci, Dept Chem, Tianjin Key Lab Mol Optoelect Sci, Tianjin 300072, Peoples R China
7.Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Tianjin 300072, Peoples R China
8.ERI N, Res Techno Plaza,X Frontier Block,Level 5, Singapore 637553, Singapore
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