Size-controlled synthesis SnSe2 QDs and its optical propertiess

Xingfan Chen; Xueming Li; Libin Tang; Kar Seng Teng

doi:10.1117/12.2620631

8 July 2022 Size-controlled synthesis SnSe₂ QDs and its optical properties

Xingfan Chen, Xueming Li, Libin Tang, Kar Seng Teng

Proceedings Volume 12284, 2021 International Conference on Optical Instruments and Technology: IRMMW-THz Technologies and Applications; 122840E (2022) https://doi.org/10.1117/12.2620631
Event: 2021 International Conference on Optical Instruments and Technology, 2022, Online Only

Abstract

Herein, SnSe2 QDs have successfully been prepared by liquid-phase ultrasonic exfoliation of the group IV metal-sulfide compounds. The morphology and structure of the SnSe2 QDs were characterized by transmission electron microscopy (TEM) and high-resolution transmission microscopy (HR-TEM), and the composition of the materials was analyzed by X-ray diffraction (XRD) and Raman spectroscopy (Raman). The absorbance of the samples with different wavelengths was analyzed by UV-Vis spectrophotometer, and the fluorescence intensity at different excitation wavelengths was studied by fluorescence spectrometer (PL), and the effect of different centrifugal speeds on the particle size of QDs and the spectral red-shift caused by the size effect was investigated. The average lateral sizes of SnSe₂ QDs samples obtained at centrifugal speeds of 3500, 1500 and 500 rpm were 1.86 nm, 2.73 nm, and 3.3 nm, respectively. The SnSe₂ QDs exhibited significant absorption in the infrared band and red-shift with increasing QDs size, The results demonstrated the potential use of this new material in infrared detection.

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Xingfan Chen, Xueming Li, Libin Tang, and Kar Seng Teng "Size-controlled synthesis SnSe₂ QDs and its optical properties", Proc. SPIE 12284, 2021 International Conference on Optical Instruments and Technology: IRMMW-THz Technologies and Applications, 122840E (8 July 2022); https://doi.org/10.1117/12.2620631

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KEYWORDS

Absorption

Crystals

Particles

Raman spectroscopy

Transmission electron microscopy

Optical properties

Diffraction

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