| Autor: |
Maxim Rabchinskii, Leonid Mironov, Yevgeniy Sgibnev, Ilya Kolesnikov, Dmitry Kurdyukov, Daniil Eurov, Demid Kirilenko, Aleksandr Shvidchenko, Dina Stolyarova, Dmitry Smirnov, Valery Golubev |
| Předmět: |
|
| Zdroj: |
Nanotechnology; 11/22/2019, Vol. 30 Issue 47, p1-1, 1p |
| Abstrakt: |
The treatment of monodisperse carbon nanodots (MCNDs) with a combination of aqueous ammonia and hydrogen peroxide is found to result in a prominent enhancement of their fluorescence efficiency. Depending on the hydrogen peroxide concentration, an increase of the MCNDs quantum yield of up to seven-fold has been achieved. Considering the absence of prominent changes in fluorescence lifetime and fluorescence spectra upon the treatment it is suggested that the observed rise of fluorescence efficiency originates from additional formation of new isolated sp2 domains surrounded by defect sites. The structural modification of MCNDs induced by their treatment with combination of aqueous ammonia and hydrogen peroxide is indicated by both transmission electron microscopy images and infrared spectra. The applied method has insignificant effect on the aggregation properties and size distribution of the studied MCNDs. Taking into account the proposed mechanism, the applied treatment procedure can serve as a basis for a facile approach for modification of emissive properties of various nanocarbon structures. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
