A research team from Peking University in China has developed an approach to make manually operated monolayer graphene pasters with polyvinyl butyral (PVB). A graphene paster is a two-layer structure comprising a graphene layer and a PVB layer about 500 nm thick. The mechanical strength of the PVB layer means that the pasters have good self-supporting properties. As a result, manual manipulations to the monolayer graphene, such as clamping, moving, cutting, pasting and transfer can be easily realized. This minimizes further challenges in its subsequent applications.

Improving the transfer process

Graphene pasters can also be quickly diverted onto any substrate with sufficient contact. This overcomes some of the obstacles in graphene transfer, measurement and other applications. Through dissolving PVB with alcohol, high-quality graphene can be acquired. This improved transfer process via graphene pasters protects the integrity of monolayer graphene and makes it more applicable as it introduces few cracks or tears into the graphene.

Magnetic properties

Large-scale monolayer graphene films diverted by graphene pasters maintain low resistivity and a low Dirac point, while also exhibiting high magnetoresistance. Obvious negative magnetoresistance at low magnetic fields due to weak localization can also be observed. Graphene pasters can be used in many domains, such as field effect transistor (FET) devices, optical devices, magnetic devices and graphene superconducting quantum interference devices (SQUIDs).

More information can be found in the journal Nanotechnology 25 275704.

Further reading

Graphene transfer tactic pays off for flexible devices (Oct 2013)
2D transfers made easy (Apr 2014)