Abstract
Highly luminescent carbon dots (CDs) seem to be a good replacement for environmentally hazardous semiconductor QDs such as CdSe, CdSe/ZnS etc. CDs have been synthesized by various chemical and physical routes. However, they suffer from a drawback of variation in emission wavelength with the variation in excitation wavelength and also with dilution of CDs in the solvent. In this paper we report synthesis of highly stable CDs using citric acid and hexadecyl amine (HDA) as precursors. The fabrication conditions have been optimized and it has been observed that the concentration of HDA plays a vital role in the stability of the fabricated CDs. When the molar concentration of HDA is almost two times the molar concentration of Citric acid, good quality CDs are fabricated which are highly luminescent and stable. Stability check of these CDs is carried out by recording the emission spectra under various excitation wavelengths and concentrations of CDs.
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