The effect of precursor on the optical properties of carbon quantum dots synthesized by hydrothermal/solvothermal method

In the recent decade, Carbon Quantum Dots (CQDs) have attracted lots of attention due to their excellent properties such as tunable photoluminescence, high chemical stability, low toxicity, and biocompatibility. Among all synthesis methods, the hydrothermal/solvothermal rout has been considered as o...

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Hauptverfasser: Mozdbar, Afsaneh, Nouralishahi, Amideddin, Fatemi, Shohreh, Mirakhori, Ghazaleh
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Fatemi, Shohreh
Mirakhori, Ghazaleh
description In the recent decade, Carbon Quantum Dots (CQDs) have attracted lots of attention due to their excellent properties such as tunable photoluminescence, high chemical stability, low toxicity, and biocompatibility. Among all synthesis methods, the hydrothermal/solvothermal rout has been considered as one of the most common and simplest method. The type of precursors can affect the size of CQDs and determine their surface functional groups, the essential properties that deeply influence the optical specifications. In this work, the effect of different precursors on the final properties of carbon quantum dots is investigated. The carbon quantum dots were synthesized by hydrothermal/solvothermal rout using citric acid, thiourea, ethylamine and monoethanolamine as precursors in almost the same conditions of time and temperature. Resultant CQDs were characterized by using FTIR, UV-Visible Spectroscopy and Photoluminescence (PL) analysis. The results of UV-Vis spectroscopy showed that quantum dots synthesized from monoethanolamine have wider absorption band rather than the CQDs from other precursors and the absorption edge shifted from about 270 nm for ethylamine to about 470 nm in monoethanolamine. Furthermore, the results demonstrate that using citric acid and monoethanolamine as precursor improved production efficiency and emission quantum yield of the carbon dots.
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subjects Absorption spectra
Biocompatibility
Carbon
Carbon dots
Chemical synthesis
Citric acid
Fourier transforms
Functional groups
Monoethanolamine (MEA)
Optical properties
Organic chemistry
Photoluminescence
Precursors
Quantum dots
Spectrum analysis
Toxicity
title The effect of precursor on the optical properties of carbon quantum dots synthesized by hydrothermal/solvothermal method
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