中国物理B ›› 2022, Vol. 31 ›› Issue (3): 37803-037803.doi: 10.1088/1674-1056/ac1f0d

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Surface-enhanced fluorescence and application study based on Ag-wheat leaves

Hongwen Cao(曹红文)1, Liting Guo(郭立婷)1, Zhen Sun(孙祯)1, Tifeng Jiao(焦体峰)2,†, and Mingli Wang(王明利)1,‡   

  1. 1 State Key Laboratory of Materials Science&Technology and Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, China;
    2 Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China
  • 收稿日期:2021-06-14 修回日期:2021-08-01 接受日期:2021-08-19 出版日期:2022-02-22 发布日期:2022-02-17
  • 通讯作者: Tifeng Jiao, Mingli Wang E-mail:tfjiao@ysu.edu.cn;wml@ysu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 21872119 and 22072127) and Science and Technology Project of Hebei Education Department, China (Grant No. ZD2019069).

Surface-enhanced fluorescence and application study based on Ag-wheat leaves

Hongwen Cao(曹红文)1, Liting Guo(郭立婷)1, Zhen Sun(孙祯)1, Tifeng Jiao(焦体峰)2,†, and Mingli Wang(王明利)1,‡   

  1. 1 State Key Laboratory of Materials Science&Technology and Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, China;
    2 Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China
  • Received:2021-06-14 Revised:2021-08-01 Accepted:2021-08-19 Online:2022-02-22 Published:2022-02-17
  • Contact: Tifeng Jiao, Mingli Wang E-mail:tfjiao@ysu.edu.cn;wml@ysu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 21872119 and 22072127) and Science and Technology Project of Hebei Education Department, China (Grant No. ZD2019069).

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摘要： Wheat leaves with natural microstructures as substrates were covered by the silver nanoislands by magnetron to prepare a low-cost, environment-friendly and mass production surface-enhanced fluorescence (SEF) substrate (Ag-WL substrate). The best SEF substrate was selected by repeatly certifying the fluorescence intensity of 10-5 M Rhodamine B (RB) and 10-5 M Rhodamine 6G (R6G) aqueous solutions. The abundant semi-spherical protrusions and flake-like structures on the surface of the Ag-WL substrate produce high-density hot spots, which provides a new and simple idea for the preparation of biomimetic materials. The results of 3D finite-different time-domain (FDTD) simulation show that the nanoisland gap of semi-spherical protrusions and flake-like structures has produced rich hotspots. By adjusting the time of magnetron sputtering, the enhancement factor (EF) was as high as 839 times, relative standard deviation (RSD) reached as low as 10.7%, and the substrate was very stable and repeatable, which shows that Ag-WL substrate is trustworthy. Moreover, semi-spherical protrusions provide stronger surface-enhanced Raman scattering (SERS) effects compared to flake-like structure. What is more surprising is that the detection limit of the substrate for toxic substance crystal violet (CV) is as low as 10-10 M.

关键词: surface-enhanced fluorescence, wheat leaf, crystal violet, semi-spherical protrusions

Abstract: Wheat leaves with natural microstructures as substrates were covered by the silver nanoislands by magnetron to prepare a low-cost, environment-friendly and mass production surface-enhanced fluorescence (SEF) substrate (Ag-WL substrate). The best SEF substrate was selected by repeatly certifying the fluorescence intensity of 10-5 M Rhodamine B (RB) and 10-5 M Rhodamine 6G (R6G) aqueous solutions. The abundant semi-spherical protrusions and flake-like structures on the surface of the Ag-WL substrate produce high-density hot spots, which provides a new and simple idea for the preparation of biomimetic materials. The results of 3D finite-different time-domain (FDTD) simulation show that the nanoisland gap of semi-spherical protrusions and flake-like structures has produced rich hotspots. By adjusting the time of magnetron sputtering, the enhancement factor (EF) was as high as 839 times, relative standard deviation (RSD) reached as low as 10.7%, and the substrate was very stable and repeatable, which shows that Ag-WL substrate is trustworthy. Moreover, semi-spherical protrusions provide stronger surface-enhanced Raman scattering (SERS) effects compared to flake-like structure. What is more surprising is that the detection limit of the substrate for toxic substance crystal violet (CV) is as low as 10-10 M.

Key words: surface-enhanced fluorescence, wheat leaf, crystal violet, semi-spherical protrusions

中图分类号:  (Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)

  • 78.67.-n
78.55.-m (Photoluminescence, properties and materials) 73.20.-r (Electron states at surfaces and interfaces)