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Updated: Jul 26, 2025
11:10
Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model
Published on: May 23, 2018
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Metal-Insulator Transition of Single-Crystal V2O3 through van der Waals Interface Engineering
Jie Jiang1, Lifu Zhang1, Yang Hu1
1Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, United States.
ACS Nano
|June 12, 2023
Summary
This study reveals unique metal-insulator transition patterns in vanadium sesquioxide (V2O3) single-crystal sheets, differing from epitaxial films. Tailoring sheet-substrate interactions offers control over phase transitions for Mott device applications.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Strongly correlated electron materials exhibit complex physics like superconductivity and metal-insulator transitions.
- Vanadium sesquioxide (V2O3) is a key material showing coupled metal-insulator and magnetic transitions near 150 K.
- Epitaxial V2O3 films show substrate-dependent phenomena, limiting understanding of intrinsic properties.
Purpose of the Study:
- To investigate the metal-insulator transition kinetics and phase patterns in nanoscale V2O3 single-crystal sheets.
- To compare the transition behavior of V2O3 sheets on different substrates (graphene, SiO2) and in freestanding form.
- To explore the potential of V2O3 sheets in hybrid structures for tuning material properties and device applications.
Main Methods:
- Fabrication and characterization of V2O3 single-crystal sheets at nano and micro scales.
- In-situ observation of phase transitions and analysis of phase patterns.
- Creation of hybrid structures (e.g., V2O3/graphene, V2O3/SiO2, MoS2/V2O3) to study sheet-substrate coupling effects.
- Strain generation and optical property tuning in MoS2 via V2O3 phase transitions.
Main Results:
- Observed unique triangle-like alternating metal/insulator phase patterns during V2O3 sheet phase transitions.
- Demonstrated single-stage metal-insulator transition in V2O3/graphene versus multistage in V2O3/SiO2, highlighting substrate influence.
- Showcased freestanding V2O3 sheets generating significant dynamic strain in monolayer MoS2, tuning its optical properties.
- Confirmed that sheet-substrate coupling strength dictates phase transition kinetics and patterns.
Conclusions:
- V2O3 single-crystal sheets exhibit distinct phase transition behaviors compared to epitaxial films.
- Sheet-substrate coupling is a critical factor in controlling V2O3 phase transitions and patterns.
- Freestanding V2O3 sheets offer a route to dynamically tune properties of other 2D materials via strain engineering.
- Designed hybrid structures provide a tunable platform for developing next-generation Mott electronic devices.
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