# Facile Galvanic Replacement Toward One-Dimensional Cu-Based Bimetallic Nanobelts

## TL;DR

This paper introduces a new method to create one-dimensional copper-based nanobelts using a galvanic replacement process on aluminum foils.

## Contribution

The study presents a novel, single-step galvanic replacement strategy for in situ growth of Cu-based bimetallic nanobelts.

## Key findings

- Cu@CuO-Ag and Cu@CuO-Bi nanobelts were successfully synthesized using galvanic replacement.
- Bi predominantly exists in the oxidized Bi3+ state, forming Bi2O3-like surface species.
- The method enables controllable heterointerfaces and anisotropic 1D structures for multifunctional nanomaterials.

## Abstract

We report a galvanic replacement-driven strategy for the in situ growth of highly uniform one-dimensional (1D) Cu@CuO-X (X = Ag, Bi) nanobelts directly on aluminum foils. Unlike conventional multi-step coating or hard-template replication strategies, the formation of these heterostructured nanobelts is governed by a spontaneous interfacial galvanic replacement process between Cu and the introduced metal species, ensuring in situ growth and intimate interfacial integration. Comprehensive SEM, TEM, XRD, and XPS characterizations confirm the successful formation of Cu@CuO-Ag and Cu@CuO-Bi architectures, where Bi predominantly exists in the oxidized Bi3+ state, forming Bi2O3-like surface species. Benefiting from their 1D anisotropic framework and controllable heterointerfaces, this work underscores the distinctiveness and versatility of the self-templated galvanic replacement strategy for the design of multifunctional nanomaterials.