Type of I.P :
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Patent Title : Graphene Ribbons and A Process For Preparation Thereof
Patent Registration No : To be provided
R&D The invention is at the lab stage or proof concept stage
Pre-Commercial The invention is currently in the process of field testing
Ready For Market Invention is ready to be licensed out or sold
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A process for preparation of flat graphene ribbons, said process comprises of heating a calcinated substrate dipped in an alcoholic solution of iron salt, at a temperature above the boiling point of alcohol, under an inert gas or hydrogen gas flow, to obtain flat graphene ribbons.
Electronic structure, nanotomy, engineering applications
Graphene and related two-dimensional materials have shown unusual and exceptional mechanical properties, with similarities to origami-like paper folding and kirigami-like cutting demonstrated. For paper analogues, a critical difference between macroscopic sheets and a two-dimensional solid is the molecular scale of the thin dimension of the latter, allowing the thermal activation of considerable out-of-plane motion. So far thermal activity has been shown to produce local wrinkles in a free graphene sheet that help in theoretically understanding its stability, for example, and give rise to unexpected long-range bending stiffness. Here we show that thermal activation can have a more marked effect on the behaviour of two-dimensional solids, leading to spontaneous and self-driven sliding, tearing and peeling from a substrate on scales approaching the macroscopic. We demonstrate that scalable nanoimprint-style contact techniques can nucleate and direct the parallel self-assembly of graphene ribbons of controlled shape in ambient conditions. We interpret our observations through a simple fracture-mechanics model that shows how thermodynamic forces drive the formation of the graphene–graphene interface in lieu of substrate contact with sufficient strength to peel and tear multilayer graphene sheets. Our results show how weak physical surface forces can be harnessed and focused by simple folded configurations of graphene to tear the strongest covalent bond. This effect may hold promise for the patterning and mechanical actuating of devices based on two-dimensional materials.
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