Self-Organized Freestanding One-Dimensional Au Nanoparticle Arrays

Keywords

Au nanoparticle arrays; plasmon; SiO nanowires 2; surface modulation; thermal oxidation

Abstract

One-dimensional Au nanoparticle arrays encapsulated within freestanding SiO2 nanowires are fabricated by thermal oxidation of Au-coated Si nanowires with controlled diameter and surface modulation. The nanoparticle diameter is determined by the Si nanowire diameter and Au film thickness, while the interparticle spacing is independently controlled by the Si nanowire modulation. The optical absorption of randomly oriented Au nanoparticle arrays exhibits a strong plasmonic response at 550 nm. Scanning transmission electron microscopy (STEM)-electron energy loss spectrum (EELS) of nanoparticle arrays confirmed the same plasmonic response and demonstrated uniform optical properties of the Au nanoparticles. The plasmonic response in the STEM-EELS maps is primarily confined around the vicinity of the nanoparticles. On the other hand, examination of the same nanowires by energy-filtered transmission electron microscopy also revealed significant enhancement in the plasmonic excitation in the regions in between the nanoparticles. This versatile route to synthesize one-dimensional Au nanoparticle arrays with independently tailorable nanoparticle diameter and interparticle spacing opens up opportunities to exploit enhanced design flexibility and cost-effectiveness for future plasmonic devices.

Publication Date

6-27-2017

Publication Title

ACS Nano

Volume

11

Issue

6

Number of Pages

5844-5852

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1021/acsnano.7b01479

Socpus ID

85021400511 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85021400511

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