Author/Authors :
Hussein Altajer, Amjad Department of pharmaceuticals - college of pharmacy - Almaaqal University, Iraq , Amri Tanjung, Faisal Faculty of Science and Engineering - Universitas Medan Area - North Sumatera, Indonesia , Hasan Jabbar, Abdullah Optical Department - College of Health and Medical Technology - Sawa University - Ministry of Higher Education and Scientific Research - Al-Muthanaa - Samawah, Iraq , Oudah Mezan, Salim General Directorate of Education in Al-Muthanna Governorate - Ministry of Education, Republic of Iraq , Thangavelu, Lakshmi Department of Pharmacology - saveetha Dental College and Hospital - saveetha institute of medical and Technical Sciences - saveetha university - Chennai, India , Kadhim, Mustafa M Department of Dentistry - Kut University College - Kut - Wasit, Iraq , Alkaim, Ayad F University of Babylon, Iraq
Abstract :
Nanostructures have proved to be a very attractive option for sensor
application due to their physical and chemical properties. In recent years,
carbon quantum dots as a new member of carbon nanostructures has been
widely used in the field of sensors. In this work, carbon quantum dots
was synthesized via green precursors using hydrothermal method. The
prepared products were characterized via with X-ray diffraction (XRD)
analysis, Transmission Electron Microscopy (TEM), FT-IR, UV-Vis,
and Photoluminescence (PL) spectroscopy. The results revealed that the
prepared carbon quantum dots provide excitation-dependent fluorescence
emission. The obtained findings from photoluminescence spectroscopy
revealed that as-prepared carbon quantum dots could be applied as
a fluorescent probe for detection of ascorbic acid. The PL of carbon
quantum dots can be significantly quenched by Cr(VI), which follows
a dynamic quenching mechanism. As ascorbic acid enters the solution,
Cr(VI) reduced to Cr(III) which cause the turn back the carbon quantum
dots fluorescence and a good linearity in range of 0.06–0.18 mM.
Keywords :
Carbon quantum dots , Nanosensor , Photoluminescence , Quenching
