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Microsphere-Assisted Robust Epidermal Strain Gauge for Static and Dynamic Gesture Recognition.

Zongming Su¹, Haotian Chen², Yu Song¹

¹Institute of Microelectronics, Peking University, Beijing, 100871, China.

Small (Weinheim an Der Bergstrasse, Germany)

|November 3, 2017

Summary

Researchers developed a stretchable epidermal strain gauge using 3D microsphere arrays and multiwalled carbon nanotubes (MWNTs). This robust sensor offers stable performance for electronic skin applications, effectively detecting human gestures.

Keywords:

epidermal sensors gesture recognition percolation networks self-assembly

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Area of Science:

Materials Science
Nanotechnology
Wearable Electronics

Background:

Developing robust and stretchable strain sensors is crucial for advanced electronic skin applications.
Existing sensors often require complex packaging and lack durability against mechanical damage.

Purpose of the Study:

To present a novel and robust epidermal strain gauge utilizing 3D microsphere arrays for immobilizing multiwalled carbon nanotubes (MWNTs).
To demonstrate the sensor's high stretchability, durability, and effectiveness in detecting human gestures.

Main Methods:

Fabrication of a conductive network by self-assembly of MWNTs onto polystyrene (PS) microspheres via solvent deposition.
Integration of the MWNT-microsphere composite with an elastomer to achieve 100% stretchability.
Characterization of sensor performance, including stability, gauge factor, and gesture recognition capabilities.

Main Results:

The immobilized MWNT (I-MWNT) network exhibited excellent stretchability and durability, passing tape tests without additional packaging.
The strain sensor demonstrated stable resistive responses for over 1000 cycles with a gauge factor of 1.35.
The thin-film sensor was successfully applied to detect epidermal strain and recognize hand gestures in both static and dynamic modes.

Conclusions:

The 3D microsphere array approach provides a robust and effective method for creating stretchable MWNT-based strain sensors.
The developed sensor shows significant potential for applications in human-robot interaction and wearable health monitoring.
This fabrication technique offers a scalable and practical solution for advanced epidermal electronics.