Biodegradable Carrageenan-Based Force Sensor: An Experimental Approach.

Area of Science:

• Materials Science
• Green Technology
• Sensor Technology

Background:

• The demand for sustainable and cost-effective sensing solutions is increasing.
• Biodegradable materials offer an environmentally friendly alternative to traditional sensor components.
• Carrageenan and iron (III) oxide are abundant, inexpensive natural resources.

Purpose of the Study:

• To develop and characterize novel biodegradable piezoresistive pressure sensors.
• To investigate the feasibility of using carrageenan and iron (III) oxide for sensing applications.
• To evaluate the performance and limitations of the developed sensor prototypes.

Main Methods:

• Fabrication of flexible film sensors using a carrageenan and iron (III) oxide composite.
• Experimental testing to determine electrical and mechanical properties.
• Analysis of sensor response to varying force/pressure loads.

Main Results:

• A sensor composition of 1.8% iron (III) oxide and 18% glycerol demonstrated suitability for load measurement up to 500 N.
• A sensitivity of 0.355 kΩ/N was achieved with an active sensor area of 100 mm².
• The sensors exhibited square resistance dependence to force and showed initial hysteresis and plastic deformation.

Conclusions:

• The developed carrageenan and iron (III) oxide composite is a viable material for low-cost, biodegradable pressure sensors.
• Glycerol is essential for material elasticity and environmental protection.
• Further research is needed to address initial use effects and explore diverse applications.