Silicon quantum-dots-based optical probe for fluorometric detection of Cr6+ ions
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Keywords

Cr6 ion
fluorometric detection
Si quantum dots
SiQDs
optical probe
hydrothermal method

How to Cite

1.
Do DT, Luyen VN, Nguyen TTH, Pham MH, Pham VT, Truong TNL. Silicon quantum-dots-based optical probe for fluorometric detection of Cr6+ ions. hueuni-jns [Internet]. 2022Jun.30 [cited 2024Mar.29];131(1B):29-37. Available from: https://jos.hueuni.edu.vn/index.php/hujos-ns/article/view/6546

Abstract

In this report, silicon quantum dots (SiQDs) with the NH2 functional group were synthesized with the hydrothermal method. The as-prepared SiQDs exhibit a strong fluorescence emission peak               at 441 nm when excited at 355 nm and are effectively quenched upon adding Cr6+ ions. Hence, SiQDs were used as an optical probe to detect Cr6+ ions in solutions. The crystal structure of SiQDs was characterized by using X-ray diffraction (XRD). The Fourier-transform infrared spectroscopy (FT-IR) was used to determine the linker groups on the SiQDs surface. The fluorescence spectroscopic technique with an excitation wavelength of 355 nm was used to quantify the Cr6+ ion concentration in the solutions in the range of 0.1–1000 µM. Competition from common coexisting ions, such as K+, Na+, Al3+, Zn2+, and Pb2+, was ignorable. The test with actual samples showed good linearity for the Cr6+ concentration range of 0.1–50 µM.

https://doi.org/10.26459/hueunijns.v131i1B.6546
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