Abstract
We mimic unique honeycomb structure as well as its functions of storing honey and pollen to assemble Au nanoparticle pattern on honeycomb-like Al nanobowl array by utilizing solid state dewetting process. Patterned Au nanoarrays of ‘one particle per bowl’ with tunable plasmonic bands ranging from the visible to the near-infrared region are fabricated by finely selecting the initial thickness of Au film, the geometry of Al nanobowl array and the thermal treatment parameters. This work presents a powerful approach to assemble Au nanoparticles into high density nanoarrays with superior spatial resolution, offering highly concentrated electromagnetic fields for plasmonic sensor applications.
Highlights
In nature, honeycomb typically shows a closely packed hexagonal wax cells where honey and pollen are stored
The assembly of Au nanoparticles into honeycomb-like Al nanobowl array by solid state dewetting (SSD) process is schematically shown in Fig. 1, which starts with the fabrication of anodic aluminum oxide (AAO) template
We find that the experimental results are slightly larger, which may results from the fact that Au nanoparticles are not perfect spheres and there is a large interface between the particles and underlying Al nanobowl[11]
Summary
Honeycomb typically shows a closely packed hexagonal wax cells where honey and pollen are stored This most efficient, least wasteful and strongest building system continues inspiring human to engineer honeycomb-like structures[1]. SSD describes the formation of island particles when solid state matters (e.g. metals) are heated to sufficiently high temperatures (below melting temperature). This process can be used to manipulate metallic nanostructures with preset parameters by utilizing nanotemplates and optimizing the total surface energy of metallic thin film, substrate and their interfaces[2, 6,7,8,9,10,11,12,13,14,15]. The patterned Au nanoarrays exhibit high spatial resolutions and tunable plasmonic bands over a broad range from the visible to the NIR region
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