Mulberry Juice-Derived Carbon Quantum Dots as a Cu Ion Sensor: Investigating the Influence of Fruit Ripeness on the Optical Properties

This study synthesized carbon quantum dots (CQDs) with green photoluminescence through a hydrothermal method that utilized mulberry juice as the carbon source. The influence of fruit ripeness on the physical and chemical properties, focusing on the fluorescence spectra, has been explored. Fourier-tr...

Full description

Saved in:
Bibliographic Details
Published inNanomaterials and nanotechnology Vol. 2023
Main Authors Salih Ajaj, Chiayee, Sadiq, Diyar
Format Journal Article
LanguageEnglish
Published John Wiley & Sons, Inc 20.09.2023
Subjects
Analysis
Composition
Infrared spectroscopy
Mulberry
Photoluminescence
Quantum dots
United States
Online AccessGet full text

Cover

More Information
Summary:This study synthesized carbon quantum dots (CQDs) with green photoluminescence through a hydrothermal method that utilized mulberry juice as the carbon source. The influence of fruit ripeness on the physical and chemical properties, focusing on the fluorescence spectra, has been explored. Fourier-transform infrared spectroscopy (FT-IR) and energy dispersive X-ray analysis (EDX) showed that there were oxygen-containing groups, and X-ray diffraction (XRD) showed that the carbon quantum dots (CQDs) were graphitic. The results revealed that the CQDs had an average size of around 7.4nm and 9.7nm for unripe and ripe mulberry juice, respectively. These CQDs emitted green light at 500nm and 510nm in unripe and ripe mulberry juice, respectively, when excited at a wavelength of 400nm. The prepared CQDs exhibited excitation-dependent photoluminescence (PL) emission behavior, demonstrating their dependence on the excitation light. The impact of fruit ripeness on optical properties was explored by examining fluorescent spectra from different fruits (including tomato and blackberry), demonstrating comparable behaviors observed in mulberry fruit. In addition, the prepared CQDs were utilized as a fluorescent sensor with high specificity to detect Cu[sup.2+] ions. The detection limit (DL) for this sensor was determined to be 0.2687µM, and the limit of qualification (LOQ) is 0.814µM. The linear range for detection lies between 0.1 and 1µM. The selectivity of the CQDs towards Cu[sup.2+] ions was confirmed by recording the PL response for Cu[sup.2+] ions compared to the weak response of other metal ions. According to these results, the CQDs can be applied in various cellular imaging and biology applications, bio-sensing, optoelectronics, and sensors.
ISSN:1847-9804
1847-9804
DOI:10.1155/2023/9980479