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- The single layer state of graphite is called the graphene layer and is a honeycomb lattice with hexagonal symmetry. If the distance between the closest neighbors is a, (a) Identify the primitive lattice vectors of the structure and draw the primitive unit cell clearly showing the base atoms. (b) Determine the first Brillouin region by calculating the purl vectors. (c) Assuming that the electron density is 7.1010 cm-2, calculate the two-dimensional free electron Fermi energy for the graphene sheet (in eV).If the adsorption of a gas onto a surface is found, somewhat unusually, to be endothermic, what can be said about the entropy change on adsorption?About the adsorption process and phenomenon, discuss the interactions between solid and adsorbent in chemisorption and fissorption.
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