Facile Synthesis of Sprayed CNTs Layer-Embedded Stretchable Sensors with Controllable Sensitivity

Area of Science:

• Materials Science
• Nanotechnology
• Sensor Technology

Background:

• Flexible electronics are crucial for advanced applications.
• Developing robust and sensitive flexible sensors is an ongoing challenge.
• Carbon nanotubes (CNTs) offer unique electrical and mechanical properties for sensor development.

Purpose of the Study:

• To fabricate highly flexible, stretchable, and sensitive sensors.
• To investigate the effect of CNT layer thickness on sensor performance.
• To demonstrate the sensor's capability in detecting human body movements.

Main Methods:

• A facile fabrication process involving spraying CNT solution onto a polymer layer.
• Creating a sandwiched composite structure with two polymer layers and a CNT core.
• Varying CNT solution volumes (10-100 mL) to control CNT layer thickness and density.
• Characterizing physical properties using SEM and optical imaging.
• Monitoring electrical resistance changes during human body motion (finger/wrist bending).

Main Results:

• The conductivity of the CNT layers increased with higher CNT solution volumes.
• Sensor sensitivity showed an inverse relationship with CNT solution volume.
• The fabricated sensors demonstrated good response to finger and wrist bending.
• SEM and optical images confirmed the physical characteristics of the CNT layers.

Conclusions:

• A straightforward method for producing flexible, stretchable, and sensitive sensors using sprayed CNTs was developed.
• The proposed method allows for controlled fabrication of sensors with tailored sensitivity for specific strain ranges.
• These sensors show promise for applications in wearable electronics and human motion monitoring.