首页|Luminescence and magnetic properties of bifunctional nanoparticles composited by nitrogen-doped graphene quantum dots and gadolinium

Luminescence and magnetic properties of bifunctional nanoparticles composited by nitrogen-doped graphene quantum dots and gadolinium

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In this paper,nitrogen-doped graphene quantum dots(N-GQDs)were combined with gadolinium ions(Gd3+)by a surface modification to obtain magneto-optical dual-functional N-GQDs/Gd3+nanoparticles.The morphology of obtained composite was characterized by field emission scanning electron micro-scopy and transmission electron microscopy.Luminescence and magnetic properties were measured by a fluorescence spectrophotometer and a vibrating sample magnetometer,respectively.Results indicate that well-dispersed spherical N-GQDs/Gd3+nanoparticles have an average diameter of 7 nm.N-doping significantly increases the luminescence of particles with an optimal luminescence intensity at 20 ℃ and pH=9.X-ray photoelectron spectroscopy results indicate that the N-doping introduces pyrrolic N as an electron donor,enhancing fluorescence by increasing the surface electron cloud density of N-GQDs.In addition,density functional theory calculation results reveal that N-doping reduces the band gap of N-GQDs/Gd3+,enabling electronic transitions to higher energy levels and generating more activation sites,thereby enhancing luminescence.Compared to N-GQDs/Gd3+prepared at 20 ℃,the saturated magne-tization of particles prepared at 40 ℃ is 0.85 emu/g,indicating a better magnetic response.The above results suggest that bifunctional nanomaterials N-GQDs/Gd3+with excellent optical properties and magnetism can be better used for fluorescence and magnetic resonance imaging.

Nitrogen-doped graphene quantum dotsGadoliniumLuminescenceMagnetismRare earths

Wanli Zhang、Hao Zhou、Meigui Ou、Donghao Sun、Chunlin Yang

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College of Materials and Metallurgy,University of Guizhou,Guiyang,550025,China

National Local Co-construction Engineering Laboratory for High Performance Metal Structure Material and Manufacture Technology,Guiyang,550025,China

College of Chemistry and Materials Engineering,Guiyang University,Guiyang,550003,China

Science and Technology Project from Guizhou ProvinceScience and Technology Project from Guizhou ProvinceScience and Technology Project from Guizhou ProvinceCentral Government Guides Local Science and Technology Development

[2022]031[2023]267[2023]016[2019]4011

2024

10.1016/j.jre.2023.05.005

稀土学报(英文版)
中国稀土学会

稀土学报(英文版)

CSTPCDEI
影响因子：1.3
ISSN：1002-0721
年,卷(期)：2024.42(4)
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