Aqueous synthesis of protectant-free copper nanocubes by a disproportionation reaction of Cu2O on synthetic saponite

Abstract

Here, we report a synthesis of Cu nanocubes by photoreduction of CuSO₄. Because synthetic saponite (one of the layered clay minerals) was used as the adsorbent, the nanocubes contained no capping agents or protectants, and the disproportionation reaction of Cu₂O with H₂SO₄ was found to be the key for morphological control.