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Million-Fold Decrease in Polymer Moisture Permeability by a Graphene Monolayer.

Sindhu Seethamraju¹, Shishir Kumar¹, Krishna Bharadwaj B¹

¹Centre for Nanoscience and Engineering, ‡Department of Chemical Engineering, and §Department of Materials Engineering, Indian Institute of Science , Bangalore 560012, India.

|June 18, 2016

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A novel graphene-embedded polymer (GEP) offers unparalleled moisture protection, reducing water vapor transmission rate by a million-fold. This breakthrough material is ideal for flexible electronics and sensitive packaging applications.

Area of Science:

Materials Science
Nanotechnology
Polymer Science

Background:

Flexible, transparent, and moisture-impermeable materials are essential for advanced packaging.
Current materials often struggle to meet the stringent requirements of electronic, food, and pharmaceutical industries.

Purpose of the Study:

To develop a highly effective barrier material for demanding packaging applications.
To investigate the integration of graphene into polymers for enhanced moisture resistance.

Main Methods:

Synthesizing monolayer graphene via chemical vapor deposition.
Employing a scalable melt casting process to embed graphene in a polymer substrate.
Fabricating large-area, transparent graphene-embedded polymers (GEPs).

Keywords:

DFT simulations cavity ring down spectroscopy graphene moisture barrier organic device encapsulation polymer water vapor transmission rate

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Main Results:

Achieved a million-fold reduction in water vapor transmission rate (WVTR), reaching as low as 10(-6) g m(-2) day(-1).
Demonstrated GEPs maintained transparency and flexibility.
Encapsulated organic photovoltaic (OPV) devices showed no performance degradation after 1000 bending cycles.

Conclusions:

GEPs offer exceptional moisture barrier properties suitable for sensitive applications.
The developed GEPs meet the longevity requirements for organic electronics, evidenced by accelerated aging tests.
This scalable fabrication method paves the way for advanced packaging solutions.