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Selective Enhancement of Inner Tube Photoluminescence in Filled Double-Walled Carbon Nanotubes

Rohringer, Philip (Elektronische Materialeigenschaften, AUT)

A highly selective enhancement of the optical response of the inner tubes of doublewalled carbon nanotubes (DWCNTs) has been identified upon transformation of the residual C atoms inside the hollow core to linear carbon chains (LCCs) [1]. Using standardized suspensions, we observed that the photoluminescence (PL) intensity of the inner tubes can be increased manifold, reaching a factor of 6 for tubes with (8,3) chirality. This behavior can be attributed to a local charge transfer from the inner tubes to the LCCs, counterbalancing quenching mechanisms induced by the outer tubes [2]. Furthermore, the length of the carbon chain, which can be tailored by varying the growth temperature of the LCCs and investigated by Raman spectroscopy [3], plays an essential role for this amplification, as well as the DWCNT’s diameter, that provides a stable environment for the LCCs. These findings provide a viable pathway to enhance the low PL quantum yield of DWCNTs and proof the capability of inner tubes to exhibit photoluminescence.

[1] P. Rohringer et al., Adv. Funct. Mater 2016, DOI: 10.1002/adfm.201505502

[2] M. Wanko et al., arXiv:1604.00483 [cond-mat.mes-hall].

[3] L. Shi et al., Nat. Mater. 2016, DOI: 10.1038/nmat4617, ALSO POSTER OF LEI SHI

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