Abstracts Book - IMRC 2018

• SA1-P038
MICROWAVE SYNTHESIS OF CARBON QUANTUM DOTS FOR
METAL ION SENSORS
Aruna Devi Rasu Chettiar 1 , Latha Marasamy 1 , Vivechana Agarwal 1
1 Universidad Autónoma del Estado de Morelos, CIICAp, Mexico.
Carbon quantum dots have attracted tremendous research interest due to its
excellent properties such as high aqueous solubility, low toxicity, up-converted
photoluminescence behavior and photoinduced electron transfer property.
Herein, we report a microwave synthesis of nitrogen doped carbon quantum
dots (N-CQDs) using glucose, urea and distilled water. Firstly, different amounts
of glucose and urea were dissolved in the distilled water. Then the solution was
heated in a microwave oven at 500 W for 2–10 mins. The as-synthesized N-CQDs
was characterized using X-ray diffraction (XRD), UV-Vis absorption (UV),
photoluminescence (PL), Fourier-transform infrared spectroscopy (FT-IR) and X-
Ray photoelectron spectroscopy (XPS). XRD pattern expressed a broad peak
located at 18.26° which indicated an amorphous nature. UV-Vis spectra showed
the absorption in 300-400 nm region for the N-CQDs synthesized at a different
time. The PL peak positions were shifted to longer wavelengths as the excitation
wavelength increases. From the FT-IR spectra, the vibrations of C–O–C, and C–H
bonds, the stretching vibrations of C=O combined with the asymmetric and
symmetric stretching vibrations of C–O–C in the carboxylate groups were also
detected. XPS results indicated that the fluorescent fractions contained mainly
carbon and oxygen. No observable impurities were detected. Besides, the Cu 2+ ,
Ag + , Co 2+ , Zn 2+ , Mn 2+ , Fe 2+ , Hg 2+ solutions were added to the separate vial which
contains the N-CQDs. After addition of the metal ions, the optical response of N-
CQDs was changed. Hence, the results suggested that the synthesized N-CQDs
have a great potential in the field of metal ion detection.
Keywords: N-CQDs, Optical properties, Metal ion sensors
Presenting authors email: rarunadevi89@gmail.com