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January 22, 2026Scientific ReportsOpen Access

Aloe vera derived carbon dots as multifunctional fluorescent probe for temperature, pH, and ferric ion sensing

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Authors

ARA. M. Hassan RezkMEM. K. ElnimrAAA. S. Atlam

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Overview

Demonstrates multifunctional sensing capabilities of carbon dots in various applications, suggesting their potential for eco-friendly sensors.

Key Points

  • The aim is to synthesize carbon dots from Aloe vera for applications in temperature, pH, and ferric ion sensing.
  • Synthesis of carbon dots using a one-step hydrothermal method from Aloe vera gel.
  • Varying synthesis parameters such as temperature (180-240 °C) and reaction duration (4-16 h).
  • Characterization using UV-Vis spectroscopy, photoluminescence spectroscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM), and Fourier transform infrared (FTIR) spectroscopy.
  • Optimal synthesis conditions were determined to be 240 °C for 12 hours, yielding the highest photoluminescence quantum yield.
  • Carbon dots exhibit strong thermal responsivity from 298 to 393 K.
  • Fluorescence intensity changes in response to pH levels across a range of 3-12, indicating pH sensitivity.
  • A high selectivity towards Fe³⁺ ions with near-complete fluorescence quenching and a linear range of detection from 0-500 nM.

Cite This Study

Rezk et al. (2026) studied this question.

synapsesocial.com/papers/6971bdcf642b1836717e2855https://doi.org/10.1038/s41598-025-34499-x
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