Iron oxide and various metal oxide nanotubes engineered by one-pot double galvanic replacement based on reduction potential hierarchy of metal templates and ion precursors.

Aloka Paragodaarachchi,Justin Fang,Steven Medvedovsky,Timothy Lau,Hiroshi Matsui

doi:10.1039/d0ra07482a

Aloka Paragodaarachchi, Justin Fang + Show 3 more

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https://doi.org/10.1039/d0ra07482a

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Abstract

Highlights

A one-pot double galvanic approach was explored for the rational synthesis of metal oxide nanotubes, predictable based on the reduction potential hierarchy of templates and ion precursors (e.g., Ag nanowire substrate is oxidized by MnO4À ions and it is consecutively reduced by Fe2+ ions to form an Fe2O3 nanotube)
Metal oxide nanotubes were synthesized by techniques such as template-mediated and template-free methods which include hydrothermal reaction, and chemical etching method.[4,10]
Element exchange triggered by surface energy difference has been applied to engineer various hollow metal nanoparticles,[16] and Xia group has pioneered the application of galvanic exchange reactions in the synthesis of Au, Pt and Pd hollow metal nanoparticles from Ag nanoparticle substrates.[17,18]

Summary

Introduction

A one-pot double galvanic approach was explored for the rational synthesis of metal oxide nanotubes, predictable based on the reduction potential hierarchy of templates and ion precursors (e.g., Ag nanowire substrate is oxidized by MnO4À ions and it is consecutively reduced by Fe2+ ions to form an Fe2O3 nanotube). One of the most effective and versatile sacri cial template methods for synthesizing hollow metal nanoparticles with controllable composition and size is galvanic replacement.[6,15] Galvanic replacement is a corrosion process that is driven by the difference in reduction potentials between a metallic substrate and metal ions in solution.[1] The advantage of utilizing the galvanic mechanism for nanomaterial synthesis is that the resulting hollow nanoparticles can be rationally designed by using precursors that have staggered reduction potentials in their exchange reactions.

Results

Conclusion