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Mechanically Induced Anisotropic Fragments in Sn-Doped In2O3 Nanoparticle Films for Flexible Strain Sensing Based on
Hiroaki Matsui1,2, Akira Momose3, Hidehiko Yoda4
1Department of Bioengineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
ACS Applied Materials & Interfaces
|October 12, 2023
Summary
This study introduces a novel plasmonic strain sensor using indium tin oxide nanoparticles. The sensor detects mechanical strain by monitoring changes in infrared light reflectance, enabling flexible wearable applications and human motion tracking.
Area of Science:
- Materials Science
- Nanotechnology
- Optical Engineering
Background:
- Mechanical strain sensors are crucial for wearable and stretchable electronics.
- Existing sensors often face limitations in quantifying large deformations.
Purpose of the Study:
- To develop a novel plasmonic strain sensor utilizing indium tin oxide nanoparticles.
- To investigate the mechanical control of optical properties for strain sensing.
- To demonstrate the sensor's capability for human motion detection.
Main Methods:
- Fabrication of an assembled film of indium tin oxide nanoparticles (ITO NP film) on a polydimethylsiloxane (PDMS) sheet.
- Utilizing resonant reflectance changes in the infrared range to quantify strain.
- Analyzing sensor performance under non-uniform stress distributions and evaluating flexible/wearable applications.
Main Results:
- Strain applied to the ITO NP film on PDMS reversibly tuned the resonant reflectance.
- Sensor operation relies on anisotropic fragments formed by strain-induced cracks acting as optical modulators.
- Successful optical detection of human joint movements (e.g., finger bending) was achieved.
Conclusions:
- The proposed plasmonic strain sensor offers a new approach for quantifying large mechanical deformations.
- The sensor demonstrates potential for flexible instruments and real-time human motion detection.
- This work provides insights into plasmon-based sensing for wearable technology.
