Spectroscopy of Nanocarbon Structures Synthesized in the One-Dimensional Core of Carbon Nanotubes

Wim Wenseleers, Miles Martinati, Sofie Cambré, Hans Kuzmany, Lei Shi, Philip Rohringer, Paola Ayala, Thomas Pichler

The hollow core and well-defined diameters of carbon nanotubes (CNTs) make them the ideal template for ordering one-dimensional (1D) arrays of molecules and for the controlled synthesis of 1D carbon nanostructures from suitable precursor molecules. For instance, we previously demonstrated that in this way dipolar dye molecules can be naturally aligned in an ideal head-to-tail arrangement to create assemblies with a giant total nonlinear optical response,[1] and that the optical properties of dye molecules encapsulated in SWCNTs can be strongly modulated by the SWCNT diameter, indicating very specific diameter-dependent stacking and interactions of the molecules.[2] By thermal conversion also well-defined carbon structures such as long 1D carbon chains (carbyne) or graphene nanoribbons can be synthesized inside the hollow core of CNTs. Here we show that the structure and properties of such 1D carbon chains are strongly modulated by the interaction with the host tube, which greatly modifies the chains’ bond-length alternation.[3] We also show how the band-gap and electronic spectrum of the encapsulated carbon structures can be measured in detail, even in heterogeneous mixtures, through extensive wavelength dependent resonance Raman (excitation) spectroscopy, disentangling the vibrational and electronic spectra of the different structures.

Electronic Properties of Materials
External organisation(s)
University of Antwerp
ECS Meeting Abstracts
No. of pages
Publication date
Peer reviewed
Austrian Fields of Science 2012
103021 Optics
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