RÉSUMÉ Dr. Kantesh Balani Associate Professor Department of ...
Graphene MATERIALS SCIENCE &ENGINEERING Anandh Subramaniam & Kantesh Balani Materials Science and...
-
Upload
roberta-franklin -
Category
Documents
-
view
238 -
download
1
Transcript of Graphene MATERIALS SCIENCE &ENGINEERING Anandh Subramaniam & Kantesh Balani Materials Science and...
GrapheneGraphene
MATERIALS SCIENCEMATERIALS SCIENCE&&
ENGINEERING ENGINEERING
Anandh Subramaniam & Kantesh Balani
Materials Science and Engineering (MSE)
Indian Institute of Technology, Kanpur- 208016
Email: [email protected], URL: home.iitk.ac.in/~anandh
AN INTRODUCTORY E-BOOKAN INTRODUCTORY E-BOOK
Part of
http://home.iitk.ac.in/~anandh/E-book.htmhttp://home.iitk.ac.in/~anandh/E-book.htm
A Learner’s GuideA Learner’s GuideA Learner’s GuideA Learner’s Guide
Carbon is perhaps the most fascinating element in nature The principal forms of carbon are:
Graphite Diamond Fullerene, nanotubes and related structures
Graphene
A single sheet of graphite is called graphene It is sp2 hybridized covalently bonded The bonding between the graphene sheets in graphite is of van der Walls type
In this set of slides we consider crystallographic concepts related to graphene It is a hexagonal array of Carbon atoms, which is NOT a lattice
Part of the hexagonal array of C atoms which forms the Graphene structure
Not all carbon positions form a lattice
As atoms A & B do not have identical surrounding
both cannot be lattice points
Crystal = Lattice + Motif
Grey atoms sit on the lattice positions
Motif = 1 grey + 1 green(in positions as shown)
Structure of single graphene sheet
Either the green or the grey carbon atoms can be considered to be located at lattice points(but not both)
In plane motif consists of two C atoms The unit cell is as marked