Synthesis and spectroscopic study of highly fluorescent carbon dots derived from orange juice using hydrothermal method with stilbene 420 dye

Abstract

Highly-fluorescent Carbon Quantum Dots (CQDs) are synthesized in a simple step by hydrothermal carbonization method of natural precursor such as orange juice as a carbon source. Hydrothermal method for synthesized CQDs requires simple and inexpensive equipment and raw materials, thus this method is now common synthesis method. The prepared CQDs have been characterized by X-ray, AFM, SEM, FTIR and fluorescence measurements with Stilbene 420 dye. It has found that the synthesized CQDs have amorphous structure and possess ultrafine size up to few nanometers and contains of carbon, oxygen based groups and surface-modified functional groups. Moreover, the prepared CQDs derived from orange juice have extremely good fluorescence. It showed an improvement in the optical properties when mixed with the Stilbene 420 dye. This work demonstrates the method of preparing highly fluorescent CQDs also briefly introduces the most commonly used techniques for characterizing CQDs and the results obtained and studying their optical properties by adding Stilbene 420 dye in a method that changes the input power of used laser.