Ms. Qian Zhang Profile

Qian Zhang

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Proceedings Article | 18 March 2024 Paper

Preparation and optical properties of Br-doped GQDs

Qian Zhang, Libin Tang, Kar Seng Teng, Yanfei Lü

Proceedings Volume 13104, 131044G (2024) https://doi.org/10.1117/12.3023582

KEYWORDS: Graphite oxide, Photodetectors, X-ray photoelectron spectroscopy, Bromine, Optical properties

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In this work, two-dimensional graphene oxide (GO) (e.g., oxygenated graphene sheets with epoxy, hydroxyl, and carboxyl groups) was reduced to zero-dimensional Br-doped GO quantum dots (Br-GODs) using a one-step method. The GO, which exhibits poor electrical conductivity, was reduced to Br-GODs using hydrobromic acid as a bromine source and reducing agent during hydrothermal reaction. The morphology, structural and photoelectric properties of GO and Br- GODs were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), ultraviolet-visible near infrared (UV-Vis-NIR) absorption spectroscopy, photoluminescence (PL), photoluminescence emission (PLE), Fourier transform infrared (FTIR) spectroscopy and atomic force microscopy (AFM). A photodetector based on Br-GODs material, consisting of interdigitated electrodes, was prepared. The responsivity (R) and detectivity (D*) of the photodetector can reach a maximum of 0.54 A/W and 4.33 × 10¹³ Jones, respectively, under 850 nm illumination.

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