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Ultrahigh Density Array of Vertically Aligned Small-molecular Organic Nanowires on Arbitrary Substrates

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Engineering Vertically-Growing V₂O₃ Nanosheets and Unveiling Their Novel Properties.

Dingyi Shen^1,2, Jianteng Liu¹, Zimei Zhang¹

¹Hunan Key Laboratory of Two-Dimensional Materials, State Key Laboratory of Chemo and Biosensing, College of Chemistry and Chemical Engineering, Hunan University, Changsha, China.

Small (Weinheim an Der Bergstrasse, Germany)

|July 3, 2026

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Researchers developed a new Ge-assisted method to grow high-quality, ultrathin vanadium dioxide (V2O3) nanosheets. This breakthrough enables exploration of 2D materials

Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Two-dimensional (2D) transition metal oxides (TMOs) exhibit unique electronic, magnetic, and catalytic properties.
Vanadium dioxide (V2O3) is of particular interest due to its metal-insulator transition and correlated electron behavior.
Synthesizing high-quality, ultrathin V2O3 single crystals is challenging due to complex phase stability and crystal structure.

Purpose of the Study:

To develop a controllable synthesis method for high-quality, ultrathin V2O3 nanosheets.
To investigate the electronic and magnetic properties of V2O3 in the 2D limit.
To provide a platform for exploring correlated electronic and magnetic phenomena.

Main Methods:

Ge-assisted chemical vapor deposition (CVD) strategy for vertical and free-standing growth.

Keywords:

Ge‐assisted chemical vapor deposition ferromagnetism metal‐insulator transition monolayer vanadium oxides

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Synthesis of V2O3 nanosheets with thicknesses down to 0.72 nm.

Characterization using X-ray diffraction (XRD), transmission electron microscopy (TEM), and HAADF-STEM.

Electrical characterization (thickness-dependent metallic behavior, metal-insulator transition).

Magnetization measurements (M-H curves).

Main Results:

Successfully synthesized high-quality V2O3 nanosheets with controlled thickness.
Observed thickness-dependent metallic behavior at room temperature.
Observed a pronounced metal-insulator transition upon cooling.
Detected emerging ferromagnetic properties around 140 K.

Conclusions:

A Ge-assisted CVD method enables controllable synthesis of ultrathin V2O3 nanosheets.
Thickness-controlled V2O3 nanosheets exhibit tunable electronic and magnetic properties.
This work provides a promising platform for studying 2D correlated electron systems and developing novel electronic devices.