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Huang X, Shi Z Y, Song M X, et al. Preparation and optical characterization of large-area self-assembled gold nanoparticle superlattice films[J]. Opto-Electron Eng, 2024, 51(6): 240048. doi: 10.12086/oee.2024.240048
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Preparation and optical characterization of large-area self-assembled gold nanoparticle superlattice films
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Abstract
Self-assembly of noble metal nanoparticles into superlattices can couple with plasmonic modes and light fields, holding significant promise in enhanced spectroscopy and sensing applications. However, controlling the number of layers in these self-assembled superlattice films is challenging, and small sample sizes limit their potential applications. In this study, based on a wetting-enhanced interfacial self-assembly method, we demonstrate the rapid and large-scale fabrication of monolayer densely packed nanoparticle films. Additionally, a layer-by-layer stacking method is employed to fabricate large-area, uniformly distributed gold nanoparticle superlattice films with different numbers of layers. Both experimental and computational transmission/reflection spectra indicate that the prepared superlattice samples effectively excite plasmonic modes, and higher-order plasmonic modes can also be efficiently excited with increasing superlattice layers. Moreover, adjusting the nanoparticle size enables effective modulation of the resonance peak positions of plasmonic modes. These findings provide an effective approach for the large-scale fabrication of high-quality nanoparticle superlattice films, holding promise for the design of high-performance micro/nano photonic devices. -
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References
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Overview
With the deepening development of nanotechnology, scientific research has increasingly focused on the unique photoelectric response properties of self-assembled noble metal nanoparticle superlattice structures. These structures effectively confine and enhance light fields, giving rise to a variety of plasmonic modes with significant implications for applications in spectroscopy enhancement, biosensing, and the development of nanophotonic devices. However, current self-assembly techniques face challenges in fabricating large-area, multilayer, and evenly distributed nanoparticle superlattice films, which limits their practical advancement. This study addresses this issue by introducing an innovative wetting-enhanced interfacial self-assembly method. This technique ensures rapid and uniform deposition over a large area while forming single-layer nanoparticle films. By employing a layer-by-layer stacking approach, the researchers successfully prepared a series of gold nanoparticle superlattice films with varying numbers of layers. Experimental measurements and theoretical computations of transmission/reflection spectra confirm that these films can effectively excite plasmonic modes. Furthermore, as the number of superlattice layers increases, higher-order plasmonic modes are also efficiently excited. Additionally, precise tuning of the gold nanoparticle size enables accurate control over the resonance peak positions of plasmonic modes. In summary, this study presents a novel approach for large-scale fabrication of high-quality multilayer gold nanoparticle superlattice films and reveals the critical role of nanoparticle size and superlattice layer count in governing plasmonic behavior. This research paves the way for the design and construction of advanced micro- and nanophotonic devices that leverage surface plasmon effects, thereby opening up new avenues in the field.
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Huang X, Shi Z Y, Song M X, et al. Preparation and optical characterization of large-area self-assembled gold nanoparticle superlattice films[J]. Opto-Electron Eng, 2024, 51(6): 240048. doi: 10.12086/oee.2024.240048
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Figure 1.
(a) Schematic illustration of the self-assembly and film transfer process of gold nanoparticles (NPs) induced by PFT at the water-n-hexane interface; (b) Scanning electron microscope (SEM) images of a monolayer gold nanoparticle film with a particle size of 20 nm and interparticle spacing of 1-2 nm. Scale bars are 1 μm, 200 nm, and 50 nm, respectively. Inset: Image of a monolayer gold nanoparticle film in a beaker; (c-f) Images of gold nanoparticle superlattice films with different numbers of layers transferred onto a PDMS substrate using a layer-by-layer stacking method. Images from (c) to (f) represent one layer to four layers, respectively
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Figure 2.
Reflectance spectra (a) and transmission spectra (b) of gold nanoparticle films with a size of 20 nm, from one to six layers, with the solid black line indicating the simulation results and the red line indicating the experimental measurements
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Figure 3.
Near-field distribution of a thin film of gold nanoparticles with a diameter of 20 nm and an interparticle spacing of 1 nm in (a) a single layer, (b) a bilayer, (c) a six-layer (λ = 638 nm), and (d) a six-layer (λ = 778 nm). The plasma pattern of current distribution through the interior of the nanoparticles is demonstrated next to it, and the dipole moments in the particles of each layer are indicated by the white arrows
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Figure 4.
Reflectance spectra of gold nanoparticle superlattice films with different numbers of layers and diameters (20 nm - black curve, 25 nm - red curve, 30 nm - blue curve). (a) Experimental measurement results; (b) Numerical simulation results
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