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

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.


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”


Email Address of Submitting Author


Max Planck Institute for Polymer Research



ORCID For Submitting Author


Declaration of Conflict of Interest

There is no conflict of interest

Version Notes

Version 1.0