Graphene-infused packaging is a million times better at blocking moisture

Plastic packaging might seem impenetrable — and sometimes nearly impossible to remove — but water molecules can still pass through. And this permeability to moisture can limit the lifespan of a product. To better protect goods such as electronics and medicines, scientists have developed a new kind of packaging that incorporates a single layer of graphene. They report their material, which reduces by a million fold how much water can get through, in the journal ACS Nano. These days, packaging is everywhere, sometimes even on individual fruits or vegetables. Wrapping products from food to electronics in plastic films protects them from dust, bacteria and to some extent water. But to maximize the lifetime of a moisture-sensitive device such as an organic light-emitting diode for more than a year, for example, the packaging must restrict water vapor from entering at a rate of less than 10-6 grams per square meter every day, according to Praveen C. Ramamurthy. Today's typical packaging is far from achieving that goal. Ramamurthy and colleagues wanted to see whether adding graphene to flexible polymer films would help.