A Fully Biomimetic Flexible Sensor Inspired by the Natural Layered Structure of Eggshells for Multimodal...

Area of Science:

• Materials Science
• Biomimetics
• Sensor Technology

Background:

• Advancements in flexible sensors for human-computer interaction (HCI) are rapid.
• Existing biomimetic sensors often lack multifunctional capabilities, limiting their applications.
• There is a need for integrated sensing solutions inspired by natural structures.

Purpose of the Study:

• To design and develop a fully biomimetic flexible sensor inspired by eggshell microstructure.
• To create a multifunctional sensor capable of integrating multiple sensing modes.
• To explore the sensor's utility in advanced human-computer interaction (HCI) applications.

Main Methods:

• Utilized hybrid manufacturing techniques for layer-by-layer biomimicry of eggshell structures.
• Developed an eggshell-inspired multifunctional hybrid flexible sensor (EMHFS) with four functional layers.
• Incorporated triboelectric, piezoresistive, and hydrophilic-hydrophobic layers for diverse sensing and properties.

Main Results:

• The EMHFS successfully integrates noncontact (triboelectric) and pressure (piezoresistive) sensing.
• Hydrophilic-hydrophobic layers provide directional moisture wicking, breathability, and antibacterial functions.
• The sensor demonstrated effective performance in gesture control for robotic hands, UAVs, and touchless unlocking, alongside sensitive detection of physiological signals like breathing and pulse.

Conclusions:

• The eggshell-inspired biomimetic approach offers a novel solution for flexible, multifunctional sensors.
• The developed EMHFS enables synergistic functionality and seamless switching between sensing modes.
• This technology holds significant potential for advancing human-computer interaction (HCI) devices.