Solvent effect on the absorption and emission spectra of carbon dots: evaluation of ground and excited state dipole moment

BMC Chemistry

Parisa Mohammad-Jafarieh¹  Rahman Salamat-Ahangari¹  Abolfazl Akbarzadeh²  Mohammad Pourhassan-Moghaddam³  Kazem Jamshidi-Ghaleh⁴ 

[1] Department of Chemistry, Faculty of Basic Sciences, Azarbaijan Shahid Madani University, P. O. Box 53714161, 35 km Tabriz-Maraghe Road, Tabriz, Iran;Department of Medical Biotechnology, Faculty of Advanced Medical Sciences, Tabriz University of Medical Sciences, Tabriz, Iran;Department of Medical Nanotechnology, Faculty of Medical Sciences, Tabriz University of Medical Sciences, Tabriz, Iran;Department of Medical Nanotechnology, Faculty of Advanced Medical Sciences, Tabriz University of Medical Sciences, Tabriz, Iran;Department of Physics, Faculty of Basic Sciences, Azarbaijan Shahid Madani University, 35 km Tabriz-Maraghe Road, Tabriz, Iran;

关键词: Carbon dots;    Photoluminescence;    Dipole moment;    Quantum yield;    KAT parameters;    Solvatochromic;   

DOI  :  10.1186/s13065-021-00779-6

来源: Springer

【 摘 要 】

BackgroundCarbon dots (C-dots) are photoluminescent nanoparticles with less than 10 nm in size. Today, many studies are performed to exploit the photoluminescence (PL) property of carbon dots, and our focus in this study is to estimate the dipole moment of carbon dots. For reaching our aims, C-dots were synthesized and dissolved in the different solvents.ResultsCarbon dots with intense photoluminescence properties have been synthesized by a one-step hydrothermal method from a carbon bio-source. In this research, we report on the effect of aprotic solvents on absorption and fluorescence spectra and dipole moments of C-dots dispersed in a range of many aprotic solvents with various polarity and dielectric constant at room temperature. The change in the value of dipole moment was estimated by using the Stokes shifts. The difference between the dipole moment of the excited state and the ground state was shown using an extended form of Lippert equations by Kawski and co-workers.ConclusionsThe values found for μg = 1.077 D, and μe = 3.157 D, as well as the change in the dipole moments. The results showed that the dipole moment of the excited state is more than the ground state, indicating a high density and redistribution of electrons in the excited state. Finally, the quantum yield of C-dots in the eclectic aprotic solvents was communicated and discussed.

【 授权许可】

CC BY