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Magnetic Manipulation of Nanowires for Engineered Stretchable Electronics
Byron Llerena Zambrano1, Csaba Forró2,3, Erik Poloni4
1Laboratory of Biosensors and Bioelectronics, ETH Zurich, Gloriastrasse 35, 8092 Zurich, Switzerland.
ACS Nano
|December 17, 2021
Summary
Researchers developed a novel method using low magnetic fields to precisely control nanowire alignment in composite materials. This technique enables tailored material properties for advanced applications like strain sensing.
Area of Science:
- Materials Science
- Nanotechnology
- Composite Materials
Background:
- The performance of high-tech composite materials heavily relies on the structure and density of embedded nanowires.
- Current methods struggle to simultaneously control nanowire structure and density during deposition.
- A versatile process compatible with existing deposition techniques is needed.
Purpose of the Study:
- To develop a novel method for controlled nanowire assembly in composite materials.
- To investigate the impact of nanowire orientation on the strain-dependent electrical properties of composites.
- To demonstrate the fabrication of ordered nanowire structures for advanced material applications.
Main Methods:
- Electrostatic coating of nanowires with superparamagnetic iron oxide nanoparticles in an aqueous solution.
- Manipulation of nanowires using low magnetic fields (80 mT).
- Fabrication of ordered nanowire structures (monolayers, multilayers, hierarchical) using vacuum filtration.
- Embedding nanowire films in an elastomer and testing strain-dependent electrical properties.
Main Results:
- Achieved highly ordered monolayers, multilayers, and hierarchical structures of aligned silver and gold-coated titanium dioxide nanowires.
- Demonstrated significant impact of nanowire orientation on composite performance under tensile strain.
- Composites with perpendicular nanowire alignment showed extremely low gauge factors.
- Composites with parallel nanowire alignment exhibited high gauge factors.
Conclusions:
- Low magnetic field manipulation of electrostatically coated nanowires offers precise control over their assembly and orientation.
- The developed method is adaptable to different materials and compatible with vacuum filtration.
- Controlled nanowire orientation is crucial for tailoring strain-sensing properties in composite materials.
- This technique holds promise for various material science applications beyond strain sensing.
