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Strain Sensing Based on Multiscale Composite Materials Reinforced with Graphene Nanoplatelets

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Highly Conductive Polypropylene-Graphene Nonwoven Composite via Interface Engineering.

Qin Pan^1,2, Eunkyoung Shim^1,2, Behnam Pourdeyhimi^1,2

¹The Nonwovens Institute, North Carolina State University , Raleigh, North Carolina 27606, United States.

Langmuir : the ACS Journal of Surfaces and Colloids

|July 12, 2017

Summary

We developed a highly conductive polypropylene-graphene nonwoven composite by coating polypropylene fabrics with graphene oxide and reducing it. This material achieves the highest conductivity in PP systems and shows promise for electronic textiles.

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Development of a 3D Graphene Electrode Dielectrophoretic Device

Development of a 3D Graphene Electrode Dielectrophoretic Device

Published on: June 22, 2014

Area of Science:

Materials Science
Nanotechnology
Polymer Science

Background:

Developing conductive polymer composites is crucial for advanced electronic applications.
Polypropylene (PP) nonwoven fabrics offer a versatile substrate but lack inherent conductivity.
Achieving uniform graphene coatings on hydrophobic surfaces presents a significant challenge.

Purpose of the Study:

To create a highly conductive polypropylene-graphene nonwoven composite.
To investigate the effect of surface tension on coating uniformity and material properties.
To demonstrate the potential of the composite in energy storage devices.

Main Methods:

Direct coating of melt blown polypropylene nonwoven fabrics with graphene oxide (GO) dispersions in N,N-dimethylformamide (DMF).
Chemical reduction of GO to graphene using hydroiodic acid (HI).
Fabrication of a monolithic supercapacitor using direct laser patterning.

Main Results:

Achieved a conductivity of 35.6 S m^-1 at 5.2 wt % graphene loading, the highest reported for conductive PP systems.
Demonstrated uniform GO coatings due to the matched surface tension between GO/DMF and the PP nonwoven.
Fabricated a sandwich supercapacitor with a high areal capacitance of 4.18 mF/cm².

Conclusions:

The surface tension of coating baths significantly impacts coating uniformity and affinity.
The developed polypropylene-graphene nonwoven composite exhibits excellent conductivity and stability.
The composite shows great potential for applications in electronic textiles and energy storage devices.