CC BY
11PH-I-6
The laser synthesis of nanostructured carbon for photonics
A. Kucherik1, A. Osipov1, V. Samyshkin1, S. Arakelian1, M. Portnoi2, S. Kutrovskaya3 1Stoletov Vladimir State University, Physics and applied mathematics, Vladimir, Russian Federation
2University of Exeter, School of Physics, Exeter, United Kingdom
3Westlake University, Institute of Natural Sciences- Westlake Institute for Advanced Study, Westlake, China
A regular flat array of ultimate one-dimensional (1D) carbon nanostructures - carbynes (also known as linear acetylenic or polyyne carbons) - allows fully analytical treatment within the nearest-neighbor tight-binding model. A Peierls-type double-period distortion in the direction normal to carbyne chains results in a significant reduction of the band gap of the resulting 2D crystal and even in the band gap collapse for very closely-packed collapse. This effect is opposite to the Peierls distortion band gap opening in the purely 1D case. This system also allows analytic treatment of interband dipole transitions predicting a strong polarization and frequency dependence of the transition matrix elements.
We synthesize elongated linear carbon chains (carbynes) in a colloidal solution. The method based on the formation of carbon threads by laser ablation in a colloid accompanied by the stabilization of resulting linear carbon chains by gold nanoparticles. We deposit the synthesized carbyne threads and study free standing carbyne films with the transmission electron microscopy (TEM). TEM images of the carbon threads with gold nanoparticles attached to their ends demonstrate the straight monoatomic carbon chains with linear parts about 10-24 atoms. We observe the signatures of the polyyne allotrope of carbyne in the photoluminescence and Raman spectra of the solutions. We offer the tight-binding model for calculation the HOMO-LUMO optical transition in finite-length carbon chain. The results of our experiments and theoretical description pave the way to fabrication molecular system on base with controlled and tuned optical properties.
This study was supported by the Ministry of Education and Science of the Russian Federation (state project no. 16.5592.2017/6.7), Russian Foundation for Basic Research grant # 18-32-20006_mol_a_ved. It has been performed with a participation of the Innovative Team of International Center for Polaritonics that is supported by Westlake University (Project No. 041020100118).
