Silicon quantum-dots-based optical probe for fluorometric detection of Cr6+ ions
Tập 131 Số 1B (2022), Nghiên cứu
Tập 131 Số 1B (2022)

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

Nghiên cứu
https://doi.org/10.26459/hueunijns.v131i1B.6546
Đã xuất bản 2022-06-30
Duc Tho Do
Hanoi University of Science and Technology, 58 Le Thanh Nghị St., Hanoi, Vietnam
Van Nam Luyen
Hanoi University of Science and Technology, 58 Le Thanh Nghị St., Hanoi, Vietnam
Thi Thanh Huyen Nguyen
Hanoi University of Science and Technology, 58 Le Thanh Nghị St., Hanoi, Vietnam
Manh Hung Pham
Hanoi University of Science and Technology, 58 Le Thanh Nghị St., Hanoi, Vietnam
Van Thang Pham
Hanoi University of Science and Technology, 58 Le Thanh Nghị St., Hanoi, Vietnam
Thi Ngoc Lien Truong
Vietnam – Korea Institute of Science and Technology, Hi – tech Incubation and Training Centre, Km29 Thang Long Boulevard, Hanoi, Vietnam

Tóm tắt

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
PDF (English)

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