Electrochemical Growth of Mg(OH) x Layered Films Stacked Parallel to the Substrates and Their Thermal Conversion to (111)-Oriented Nanoporous MgO Films

Tsutomu Shinagawa; Masaya Chigane; Masanobu Izaki

doi:10.1021/acsomega.0c05619

Electrochemical Growth of Mg(OH) _x Layered Films Stacked Parallel to the Substrates and Their Thermal Conversion to (111)-Oriented Nanoporous MgO Films

ACS Omega. 2021 Jan 11;6(3):2312-2317. doi: 10.1021/acsomega.0c05619. eCollection 2021 Jan 26.

Authors

Tsutomu Shinagawa^{1

2}, Masaya Chigane¹, Masanobu Izaki²

Affiliations

¹ Electronic Materials Research Division, Morinomiya Center, Osaka Research Institute of Industrial Science and Technology (ORIST), Osaka 536-8553, Japan.
² Graduate School of Engineering, Toyohashi University of Technology, Toyohashi, Aichi 441-8580, Japan.

Abstract

Stacking layered metal hydroxide films parallel to a substrate is challenging. Here, we demonstrate a simple and rapid electrodeposition method for stacking magnesium hydroxide layered films. Room-temperature cathodic electrolysis (40 mA cm^-2) in a Mg(NO₃)₂ aqueous solution induces the deposition of ⟨001⟩-oriented Mg(OH) _x layered films stacked parallel to the substrate at the deposition rate of ∼2 μm min^-1. The obtained Mg(OH) _x layered films undergo an overall oriented transformation by heat treatment to form ⟨111⟩-oriented nanoporous MgO films.