Graphene barrier allows precise control over molecules for creation of nanoelectronics

Scientists from UCLA’s California NanoSystems Institute have designed an effective way to use graphene in order to place molecules specific patterns within tiny nanoelectronic devices, which could be useful in creating sensors that are even small enough to record brain signals.

This is done by using a sheet of graphene with minuscule holes in it that is then placed on a gold substrate. The holes allow molecules to attach to the gold exactly where the scientists want them, creating patterns that control the physical shape and electronic properties of devices that are 10,000 times smaller than the width of a human hair.

UCLA scientists combine graphene with manganese oxide to create innovative supercapacitors

Researchers at UCLA’s California NanoSystems Institute have successfully combined laser-scribed graphene and manganese dioxide (which is currently used in alkaline batteries since it holds a lot of charge and is cheap and abundant) to create a new energy storage device with outstanding qualities. The new hybrid supercapacitor stores large amounts of energy, recharges quickly, and can last for more than 10,000 recharge cycles.

The scientists also created a microsupercapacitor that is small enough to fit in wearable or implantable devices. At just a fifth of the thickness of a sheet of paper, it can hold more than twice as much charge as a typical thin-film lithium battery. 

New holey graphene network enables supercapacitors with highest energy density

Researchers from the UCLA developed a new graphene-based material that can significantly enhance the energy density of supercapacitors - in fact making them as good as lead acid batteries.

They call the new material holey graphene framework. It is a 3D material that has tiny holes in it. The holey graphene features superior electrical conductivity, exceptional mechanical flexibility and unique hierarchical porosity. This enabled the researchers to create a capacitor that has an unparalleled energy densities of 35 watt hours per kilogram (49 watt hours per liter), which is up to 10 times higher than current commercial supercapacitors.

UCLA enhances their laser-scribed graphene supercapacitor technology, ready for commercialization

Back in March 2012 we posted about a UCLA research that developed laser-scribed graphene (LSG) based flexible capacitors using simple DVD burners. Now those same researchers have published a new paper describing an new structural design, which makes the capacitors compatible with other integrated circuits and enhances their capacity and speed. They are now looking for industrial partners to commercialize the technology.

Their original design stacked graphene layers to create the electrode, which was not compatible with integrated circuits. The new design uses a side-by-side electrode placement which helps to maximize the accessible surface area available for the electrodes while also reducing the path over which ions in the electrolyte would need to diffuse. The new capacitors have a higher charge capacity and rate capability.