Assembly of gold nanoparticles into aluminum nanobowl array

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.

Self-organized and self-assembled TiO2 nanosheets and nanobowls on TiO2 nanocavities by electrochemical anodization and their properties

“…The diameter and thickness were about 76 nm and 74 nm, respectively; and the separation distance between nanobowls of around 30 nm. Likewise, our TiO 2 -nb had shorter dimensions (thickness and diameter) than another published in literature [9][10][11][12][13][14][15][16][17]. Additionally, in figures 2(b) and (d), it can be seen the top of the nanocavities (TiO 2 -nc) as some little black circles, like pores, between the spaces of the nanosheets and nanobowls.…”

“…In the same way, nanobowls are nanostructured materials that have a shape of bowl or cup whose outer diameter is about or smaller than 100 nanometers [10]. Because of their excellent physical, optical and chemical properties, nanobowls are used in the field of the nanophotonics and photoelectrochemistry, in applications such as sieves for selecting particles, as nanocontainers or as light trappings [11,12].…”

“…Because of their excellent physical, optical and chemical properties, nanobowls are used in the field of the nanophotonics and photoelectrochemistry, in applications such as sieves for selecting particles, as nanocontainers or as light trappings [11,12]. Typically, nanobowls are synthesized by a colloidal crystal template, a facile solid state dewetting, microwave heating, atomic layer deposition or template-sol-gel processes [10][11][12][13][14][15][16][17]. Nonetheless, nanobowls are usually fabricated in larger dimensions, closed to 500 nm of outer diameter, and having a high manufacturing cost [12][13][14][15][16][17].…”

High SERS Sensitivity Enabled by Synergistically Enhanced Photoinduced Charge Transfer in Amorphous Nonstoichiometric Semiconducting Films

“…Besides, the reductive Al substrates can create abundant oxygen vacancies in the upcoated WO 3− x films simultaneously. The Al substrates are obtained by electrochemical polish . Evaluated by atomic force microscopy (AFM), the surface roughness of fresh polished Al substrate is ≈0.50 nm.…”

Plasmonic coupling in closed-packed ordered gallium nanoparticles

“…These substrates are produced by anodized aluminium oxide, commonly known as alumina, that has been widely used for many applications 44 and nanostructures manufacturing 45,46 . Indeed, ordered distributions of CdTe 47 , In 48 , Ag 49 , Au 50,51 and Al 52 NPs have been reported from these templates. Based on this idea, we have previously communicated the production of uniform size distributions of highly ordered Ga NPs 53 .…”