New progress in the study of two-dimensional plasmonic nanostructures in Changchun Yinghua Institute
[ Instrument Network Instrument Development ] Two-dimensional metal plasmon nanostructures have become a research hotspot in the fields of nanoelectronics, energy catalysis and sensing, with their unique planar confinement structure and surface plasmon resonance coupling effect. . However, due to the lack of deep understanding of the plasma-electron coupling effect and the precise construction of electrode interfaces and materials, the design and application of two-dimensional metal plasmonic nanostructures have faced significant challenges.
Two-dimensional Au@SiO2 nanofilm and electronic device characterization
Recently, the Jin Yongdong research team of the Changchun Institute of Applied Chemistry, Chinese Academy of Sciences has made new progress in the design of two-dimensional metal plasmon nanostructures and their applications in nanoelectronics and electrochemiluminescence bioassays. They avoided short-circuit problems by wrapping dense silicon dioxide nano-insulation on the surface of gold nanoparticles, and constructed a novel two-dimensional Au@SiO2 nano-film suspended nanoelectronic device by liquid/liquid interface self-assembly. It is revealed that the conventional electron tunneling theory cannot explain the plasmon-mediated long-range electron (tunneling) transport operation.
On this basis, the team constructed an ultra-efficient plasmonic (metal plasmon) electrochemiluminescence system using the unique photoelectric properties of the two-dimensional ordered Au@SiO2 nanoparticle film. Through the fine nano-modulation, the synergistic effect between photon scattering enhancement, "hot spot" effect and energy resonance transfer effect is optimized, and the 1000-fold enhancement of the electrochemical luminescence signal is realized. The researchers further constructed an electrochemiluminescence immunobiosensor to achieve ultrasensitive detection of prostate specific antigen (PSA) with a detection limit as low as 3fgmL-1. Related results are published on iScience (iScience, 2018, 8, 213-221, iScience, 2019, 17, 267-276).
The above research provides new ideas for the design of novel two-dimensional metal plasmon nanostructures and their applications in nanoelectronics and biochemical sensing. The research work was supported by the National Natural Science Foundation, national key research and development projects, and the Chinese Academy of Sciences project.
(Original title: New progress in the study of two-dimensional plasmonic nanostructures in Changchun Yinghua Institute)
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