Galvanic Replacement Reaction to prepare nanoporous Aluminum for UV plasmonics

TL;DR

This paper demonstrates a galvanic replacement method to create nanoporous aluminum, a promising material for ultraviolet plasmonics, enabling enhanced UV Raman spectroscopy and fluorescence applications.

Contribution

It introduces a novel galvanic replacement process to produce nanoporous aluminum suitable for UV plasmonic applications, expanding beyond traditional noble metals.

Findings

Nanoporous aluminum can be prepared from Mg3Al2 alloy.

The nanoporous structure enhances UV Raman and fluorescence signals.

The material offers a high surface-to-volume ratio for molecule interaction.

Abstract

Plasmonics applications have been extending into the ultraviolet region of the electromagnetic spectrum. Unfortunately the commonly used noble metals have intrinsic optical properties that limit their use above 350 nm. Aluminum is probably the most suitable material for UV plasmonics and in this work we show that nanoporous aluminum can be prepared starting from an alloy of Mg3Al2. The porous metal is obtained by means of a galvanic replacement reaction. Such a nanoporous metal can be exploited to achieve a plasmonic material for enhanced UV Raman spectroscopy and fluorescence. Thanks to the large surface to volume ratio this material represents a powerful platform for promoting interaction between plasmonic substrates and molecules in the UV.