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Updated: Jan 15, 2026

In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx

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Published on: May 13, 2020

Manipulating the Hydrogen-Associated Insulator-Metal Transition Through Artificial Microstructure Engineering.

Xuanchi Zhou^1,2, Xiaohui Yao¹, Wentian Lu^1,2

¹Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education & School of Chemistry and Materials Science, Shanxi Normal University, Taiyuan, 030031, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)

|October 13, 2025

Summary

Engineered microstructures in vanadium dioxide (VO2) accelerate hydrogen diffusion, enabling faster and more efficient protonic devices. This breakthrough overcomes speed limitations in hydrogen-controlled electronic systems.

Keywords:

correlated oxides electronic phase transition hydrogen diffusion ionic evolution microstructure engineering

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Atomically Traceable Nanostructure Fabrication

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Published on: July 17, 2015

Area of Science:

Materials Science and Engineering
Condensed Matter Physics
Nanotechnology

Background:

Hydrogen-associated Motttronics in electron-correlated systems offer novel functionalities.
Controlling hydrogen-related phase transitions is key for protonic devices, but slow hydrogen diffusion is a bottleneck.

Purpose of the Study:

To kinetically expedite electronic state evolution in vanadium dioxide (VO2) systems.
To overcome the high-speed bottlenecks in hydrogen-controlled electronic systems through microstructure design.

Main Methods:

Fabrication of VO2/Al2O3 (1 bar 1 02) heterostructures with inclined domain boundaries and cR-faceted preferential orientation.
Investigating hydrogen diffusion pathways and kinetics using advanced characterization techniques.
Analyzing the impact of microstructure on resistive switching properties and switching speed.

Main Results:

Engineered microstructures significantly lowered the hydrogen diffusion barrier, creating an unobstructed diffusion conduit.
Switching speed through hydrogenation improved by 2-3 times compared to VO2 on c-plane Al2O3.
Resistive switching performance improved by an order of magnitude.
Observed anomalous uphill hydrogen diffusion in VO2, deviating from Fick's law, highlighting the role of spatial distribution.

Conclusions:

Artificial microstructure design in VO2 is a powerful strategy to accelerate ionic evolution and enhance device performance.
The findings provide a pathway for designing advanced, high-speed protonic devices.
Deepened understanding of hydrogen-associated insulator-metal transitions in electron-correlated systems.