When we speak about touchscreen, everybody is very familiar, because nearly every boday use smart mobilephone. Your finger touches it, and you have the experience of communicating with touchscreen. However, if we say"graphene touchscreen", how many persons can understand what kind of the touchscreen is? In order to broadcast the knowledge of graphene touchscreen, we have written something about it.
The Korean and Japanese reserachers firstly have fabricated films of graphene - planar sheets of carbon one atom thick - measuring tens of centimetres. The researchers engineered these large graphene films into transparent electrodes, which were incorporated into touchscreen panel devices. This new innovation represents another milestone in the astonishing technological advance of graphene from its initial isolation only a few years ago. Experts forsees the graphene touchscreen will be widely used in electronical products in a few years.
Using a roller, the graphene face can then be pressed against an adhesive polymer support and the copper etched away, leaving the graphene film attached to the polymer. The graphene can then be pressed against a final substrate - such as polyethylene terephthalate (PET) - again using rollers, and the polymer adhesive released by heating. Subsequent layers of graphene can then be added in a similar way.
The researchers used this technique to create a rectangular graphene film measuring 30 inches (76 cm) in the diagonal. The graphene was doped by treating with nitric acid and in this form the graphene sheet can act as a large, transparent electrode and was demonstrated to work in a touchscreen device.
Typically, transparent electrodes used in such applications are made from indium tin oxides (ITO). The researchers say that the graphene electrode has better transparency and is tougher. ’The price of indium has increased by a few times over the past decades and this will be more serious as markets for display and solar cells expand,’ says Ahn.’In addition, oxide materials like ITO are usually fragile and weak.’ Because of this, ITO-based touchscreens have a finite life span, whereas, says Ahn, a graphene-based screen should last essentially forever.
In addition, the graphene production needs just a tiny amount of carbon sources without any rare materials, and the copper substrate is recyclable, so it is much more environmentally friendly than ITO production.’
Andre Geim of the University of Manchester in the UK, who is widely credited as being the founding father of modern graphene science having discovered isolated graphene around five years ago, says the new work demonstrates the astonishing rapidity with which graphene touchscreen technology has advanced. ’This clearly shows that graphene touchscreen is no longer wishful thinking as far as industrial applications go. People have gone from lab-scale to industrial-scale production unbelievably quickly. Within two years we will have consumer products with graphene touchscreen.