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Graphene Heads for the Stratosphere

By National University of Singapore | August 8, 2018

The Centre for Advanced Two-Dimensional Materials (CA2DM) at the National University of Singapore (NUS) has teamed up with US-based aerospace company Boreal Space to test the properties of graphene after it has been launched into the stratosphere. The results could provide insights into how graphene could be used for space and satellite technologies.

“Graphene’s usefulness on Earth has already been established in the last decade. It is now an opportune time to expand its prospects for use in space applications – an area touted as being the most challenging to modern technology – and shift the paradigm of materials science. Space is the final frontier for graphene research, and I believe this is the first time that graphene has entered the stratosphere,” says project leader Professor Antonio Castro Neto, Director of NUS CA2DM.

Two-dimensional graphene has a unique combination of being extremely flexible, harder than diamond, and stronger than steel. While researchers recognize that it may have potential for space applications, its practical uses have yet to be established.

“To move a spacecraft over long distances in space, huge accelerations and speeds which are only possible with very low mass equipment are needed. Graphene is the ideal material as it is among the lightest, yet strongest, functional materials we have. In addition, the high electronic performance of graphene makes it a prime candidate to handle the lack of oxygen and low temperatures in space,” explains Castro Neto.

A team led by Professor Barbaros Özyilmaz from NUS CA2DM coated a single layer of graphene on a substrate, and the experiment was placed in the payload enclosure of the “Wayfinder — Mini” CubeSat. Image: Boreal Space

To put graphene’s versatility to the test, a team led by Professor Barbaros Özyilmaz, Head of Graphene Research at NUS CA2DM, prepared the material by coating a substrate with a single layer of graphene which was about 0.5 nanometers thick, over 200 times thinner than a strand of human hair. The sample was securely assembled within a Boreal Space “Wayfinder — Mini” CubeSat, and placed in the payload enclosure of the sounding rocket.

The spacecraft was launched in the morning of 30 June 2018, over the Mojave Desert in the United States. The Boreal Space launch team was responsible for the payload launch support during take-off, nose cone separation, monitoring during flight, parachuting back to earth, impact and recovery.

During the launch, the spacecraft was sent into suborbital environment, and the graphene material was subjected to harsh conditions like rapid acceleration, vibration, acoustic shock, strong pressure and a wide range in temperature fluctuations. The sample re-entered Earth’s atmosphere after a 71-second flight, parachuting to a landing in the Mojave Desert.

The graphene sample was retrieved by the team on the same day, and the NUS CA2DM team is carrying out tests to assess if its structural properties and stability were affected during the launch and landing. In particular, the team will utilize Raman spectroscopy techniques to detect the presence of defects in the sample.

“If this research collaboration is able to demonstrate that graphene maintains its various properties and features after being launched into suborbital environment, it will open up exciting new opportunities for graphene to be incorporated into technologies suitable for outer space and aerospace missions. Such technologies can include electro-magnetic shielding, efficient solar power generation, and excellent thermal protection,” says Castro Neto.

Barbara Plante, President of Boreal Space, adds, “We are very excited about raising the technology readiness level of graphene and promoting its utility in space. I am convinced that graphene will play an extremely important role in space commercialization. This and future launches support the demonstration of future uses of graphene-based technology in space.”

In addition to the NUS graphene experiment, the Boreal Space “Wayfinder — Mini” CubeSat also hosted Gallium Nitride magnetic field sensors provided by Stanford University’s Extreme Environments Lab (XLab). The Stanford team is looking not only to obtain important experimental data such as launch load survival and electronics signal integrity, but also insights into magnetic interference, noise reduction and radiation effects on their sensors.

Following this combined mission, known as GRASP (GRaphene And Stanford Payloads), Boreal Space continues to provide suborbital and low earth orbit opportunities to test and validate payload survivability and operability in the space environment.

Source: National University of Singapore  

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