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Molecular Insights of Carbon Nanodot Formation and Their Two-Photon Emission Properties

preprint
submitted on 09.03.2021, 09:51 and posted on 10.03.2021, 13:15 by Nilanjon Naskar, Manfred Wagner, Hans Joachim Räder, Haoyuan Qi, Ute Kaiser, Tanja Weil, Sabyasachi Chakrabortty
The structure formation of carbon nanodots (C-dots) prepared from three different organic precursors is discussed at the molecular level. During microwave synthesis, organic chromophores associated with C-dot structures are formed that exhibit distinct optical features. We have elucidated the molecular structure of these fluorophores and investigated their optical properties with and without the C-dots. The emergence of two-photon emission was observed and correlated with the hybridization state of the carbon atoms within the C-dot as well as the formation of the fluorophores. Varying contents of sp2 and sp3 hybridization in different C-dots also affects their one-photon and two-photon emission characteristics. Understanding the molecular structure of the
carbon nanocore and the organic fluorophores formed in C-dots would enable rational design of C-dots with improved optical features, which would be of great relevance for their applications, for example, in bioimaging.

Funding

Deutsche Forschungsgemeinschaft project no 316249678 – SFB 1279 (C04, Z01)

Baden-Württemberg Stiftung (project: “intelligent optical biosensors”) via the research program “Photonics, Microelectronics, Information technology: Intelligent Optical Sensors”

History

Email Address of Submitting Author

tweil@mpip-mainz.mpg.de

Institution

Max Planck Institute for Polymer Research

Country

Germany

ORCID For Submitting Author

0000-0002-5906-7205

Declaration of Conflict of Interest

There is no conflict of interest

Version Notes

Version 1.0

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