Publication detail

On-substrate porous-anodic-alumina-assisted gold nanostructure arrays: Meeting the challenges of various sizes and interfaces

MOZALEV, A. HUBÁLEK, J.

Original Title

On-substrate porous-anodic-alumina-assisted gold nanostructure arrays: Meeting the challenges of various sizes and interfaces

Type

journal article in Web of Science

Language

English

Original Abstract

Arrays of 0- and 1-dimentional noble-metal nanostructures aligned on solid substrates are in demand for nanocatalysis, bio- and optical sensing, or biomolecular analysis. Here we introduce a range of advances based on a systematic research towards the porous-anodic-alumina (PAA)-assisted on-substrate arrays of gold nanostructures, such as rods and spheres, spatially-separated and highly aligned on a metal or semiconductor supporting layer via a blend of the anodizing, re-anodizing, and post-anodizing treatments applied to a thin layer of Al superimposed on selected valve metals (W, Ti, Hf), metal bilayers (W/Ti), or binary metal alloy layers (W-Ti). The achievements are due to (1) the improved self-organization in the PAA thin films during the self-localizing high-current anodization of the upper Al layer at challenging potentials ranging 100 to 250 V and 20 to 5 V, and (2) the enhanced penetration of the alumina barrier layer by the undergrowing metal oxide due to the increasing polarization (re-anodizing). The protrusions of the undergrown metal oxide can be either selectively dissolved away providing perfect nanoholes in the alumina barrier layer or left as formed in the barrier layer and annealed in vacuum to increase their electron conductance and serve as the supports for subsequent metal electrodeposition. Additionally, the in-situ amplitude-modulated constant-current pulse deposition mode combined with the original surface-wiping technique to remove the overdeposited gold allow for smooth nucleation and uniform finishing of perfect arrays of on-substrate gold nanospheres and nanorods, having diameters from 10 to over 250 nm and length up to 2.5 m

Keywords

porous anodic alumina, barrier layer dissolution, electrodeposition, gold nanorods, nanodots

Authors

MOZALEV, A.; HUBÁLEK, J.

Released

20. 2. 2019

ISBN

1873-3859

Periodical

ELECTROCHIMICA ACTA

Year of study

297

Number

-

State

United Kingdom of Great Britain and Northern Ireland

Pages from

988

Pages to

999

Pages count

12

URL

https://www.sciencedirect.com/science/article/pii/S0013468618326768

BibTex

@article{BUT154082,
  author="Alexander {Mozalev} and Jaromír {Hubálek}",
  title="On-substrate porous-anodic-alumina-assisted gold nanostructure arrays: 
Meeting the challenges of various sizes and interfaces
",
  journal="ELECTROCHIMICA ACTA",
  year="2019",
  volume="297",
  number="-",
  pages="988--999",
  doi="10.1016/j.electacta.2018.11.192",
  issn="1873-3859",
  url="https://www.sciencedirect.com/science/article/pii/S0013468618326768"
}