Heterogeneity in Dynamic Metamolecules

Abstract

Here, we fabricated spherical assemblies of metal nanobeads with size or material heterogeneity to study how the mismatch in the strength and energy of surface plasmon resonance (SPR) of nanobead building blocks affects the global magnetic resonance modes. In binary metamolecules (BMMs) composed of 15 and 45 nm Au beads, small 15 nm beads can act as the medium between sparsely placed large nanobeads and enhance the overall plasmon coupling, resulting in a strong and narrow magnetic dipole resonance. In BMMs made of Au and Ag nanobeads of the same size, the coupling between Au and Ag nanobeads significantly contributes to the magnetic resonance modes, affecting both their strength and position, while it does not significantly affect electric modes. These results provide valuable guidelines for the fabrication of colloidal metamolecules with desired metamaterial properties.

Gold nanoshells with varying morphologies through templated surfactant‐assisted seed‐growth method

“…We have addressed this issue by incorporating a thermoresponsive polymer core for the self-assembly of nanoparticles. 41,64,65 This new approach enables on-demand dynamic structural control using pre-synthesized uniform nanoparticles, which can lead to in-depth understanding of their complex metamaterial properties. We believe that such dynamic self-assembly will open up exciting opportunities for both fundamental investigations and new applications.…”

“…Nonetheless, the ability to form uniform assemblies can improve our understanding of the collective properties of metal nanoparticles. We have addressed this issue by incorporating a thermoresponsive polymer core for the self‐assembly of nanoparticles 41,64,65 . This new approach enables on‐demand dynamic structural control using pre‐synthesized uniform nanoparticles, which can lead to in‐depth understanding of their complex metamaterial properties.…”

Solvent‐free synthesis of ZIF‐67 thin films as the catalyst for the direct growth of carbon nanotubes for the fabrication of electrical double‐layer capacitors

“…However, in most cases, stainless steel is not a commonly used substrate for the growth of CNTs, and the reasons are briefly explained as follows: The most common method for the direct growth of CNTs is thermal chemical vapor deposition (CVD) technology, using metallic thin films (Fe, Co, Ni, etc.) as the catalysts [15]. However, a diffusion barrier layer needs to be formed onto the surface of a conductive substrate prior to the deposition of catalytic thin films for avoiding the diffusion of catalytic metal into the substrate to form the alloy at high temperatures.…”