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Nanomoulding of Functional Materials, a Versatile Complementary Pattern Replication Method to Nanoimprinting

Nanomoulding of Functional Materials, a Versatile Complementary Pattern Replication Method to Nanoimprinting

Published on: January 23, 2013

Nanomolding of Two-Dimensional Materials.

Quynh P Sam¹, Qishuo Tan², Christian D Multunas³

¹Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, United States.

|December 27, 2023

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Thermomechanical nanomolding fabricates ultrathin nanowires from layered 2D materials. This method aligns van der Waals layers vertically, enabling new studies in electron transport phenomena.

Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Lateral confinement of 2D materials is crucial for exploring topological phenomena in electron transport.
Existing synthesis methods struggle to produce nanostructures with narrow widths and high aspect ratios.

Purpose of the Study:

To demonstrate thermomechanical nanomolding (TMNM) for fabricating high-aspect-ratio nanowires from layered 2D materials.
To investigate the structural and orientational changes of van der Waals (vdW) layers during TMNM.

Main Methods:

Thermomechanical nanomolding (TMNM) was employed to create nanowires.
Six layered materials (Te, In2Se3, Bi2Te3, Bi2Se3, GaSe, Sb2Te3) were processed.
Nanowire dimensions (width ~40 nm, aspect ratio >100) and layer orientation were analyzed.

Keywords:

2D materials STEM confinement nanomolding nanowires scalable processing

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Main Results:

TMNM successfully produced nanowires with widths of 40 nm and aspect ratios exceeding 100.
Van der Waals layers rotated 90° from horizontal in bulk to vertical in nanowires, aligning along the length.
Nanowire formation was driven by interfacial diffusion and surface energy minimization.
Resulting nanowires were often single-crystalline with consistent crystallographic orientation.

Conclusions:

TMNM is a viable method for fabricating high-quality, laterally confined 2D material nanowires.
The controlled vertical alignment of vdW layers in nanowires opens possibilities for advanced electronic applications.
This technique overcomes limitations in producing nanostructures for topological and electron transport research.