PHYSICAL ELECTRONICS EEE2056 TRIMESTER 2, 2015/2016 TITLE: GRAPHENE AND ITS APPLICATIONS.

Slides:

Advertisements

Similar presentations

1)Use your white board to draw the Lewis structure for ozone, O 3. 2)What does the word hybridization mean? Use your own words. While you are doing warm.

Advertisements

Chapter 14 pp Chapter 5 pp Ionic Compounds Chapter 14 pp Chapter 5 pp

Hybridisation Some atoms form a different number of covalent bonds than the electron configurations of those atoms might suggest they should form.

Chapter 21: Bonding in Metals, Alloys, and Semiconductors Did you read Chapter 21 before coming to class? A.Yes B.No.

Topical lecture: Quantum Size Effects in Nanostructures A. Tavkhelidze Ilia State University.

Graphene & Nanowires: Applications Kevin Babb & Petar Petrov Physics 141A Presentation March 5, 2013.

Section 6.4 – Metallic Bonding

Organic Light-Emitting Diodes By: Grant Warfield.

Mr Powell VI Characteristics Ohms Law Current/voltage characteristics For an ohmic conductor, a semiconductor diode and a filament lamp Candidates.

Graphene-Based Polymer Composites and Their Applications Polymer-Plastics Technology and Engineering, 52: 319–331, 2013 Zachary Palmer, Kendall Wright,

Precursor to Organic Chem CHEMISTRY I BASICS. THE CHEMISTRY OF CARBON Carbon is the star in organic chemistry, so we must ensure that we understand all.

Carbon. Allotropes Carbon can bond with itself in at least three different ways giving us 3 different materials –Diamond –Graphite –Buckyballs and nanotubes.

The Chemical Bond. Chemical Bonds  Are the forces that hold atoms together to form compounds  Bond energy – the amount of energy needed to break a bond.

Graphene – Optical Properties Michael Tsang UC Berkeley Physics 141A Spring 2013 Lawrence Berkeley Lab Manchester Group for monolayers.

Solar Cells Typically 2 inches in diameter and 1/16 of an inch thick Produces 0.5 volts, so they are grouped together to produce higher voltages. These.

Ionic Bonds And Ionic Compounds

Delocalization of Electrons Section Introduction Delocalization allows the pi electrons to spread over more than two nuclei This spreading out of.

Diamonds are Forever! L.O: To understand the properties of giant covalent structures.

Hybridization A Blending of Orbitals Methane CH 4 CH 4 Sometimes called “natural gas, ” methane is used to heat homes. Sometimes called “natural gas,

Delocalized electrons in pi bonds What is a delocalized electron?  – Describe the delocalization of pi electrons and explain how this.

ELECTRONIC PROPERTIES OF MATTER - Semi-conductors and the p-n junction -

Conductors – many electrons free to move

1 The more awaited revolution.  Electronics without silicon is unbelievable, but it will come true with evolution of diamond or carbon chip.  Silicon.

Prepared by Lawrence Kok From : Tutorial on Allotropes of Carbon. COVALENT.

Carbon. Allotropes Carbon can bond with itself in at least three different ways giving us 4 different materials –Diamond –Graphite –Buckyballs and nanotubes.

Section 4 – pg 198 Bonding in Metals

Network Solids. Network Solid These are large macromolecules, giant structures of covalently bonded atoms in one, two or three dimensional arrays.

Properties of metals Metals (75% of elements) Lustrous (reflect light)

Macromolecules (Network Covalent) Last part of Topic 4.3.

Semiconductors. O A Semiconductor is a material whose resistivity is between that of a good conductor and a good insulator. O Examples of materials which.

Graphene and how it will be applied to Supercapacitors.

Carbon allotropes. The physical properties depend on the chemical bonding.

What is Graphene?  It is made of a single layer of carbon atoms that are bonded together in a repeating pattern of hexagons  It is one million times.

Metallic Bonding. Metallic Bonds are a special type of bonding that occurs only in metals A metallic bond occurs in metals. A metal consists of positive.

Electronic devices which are  Optically transparent  See-through  Invisibly light in weight  Transparent in visible portion of the Electromagnetic.

EEE2056 Physical Electronic Presented by Oh Chin Wei Electronic Engineering What are covered in these slides? Graphene Structures Properties.

Graphene Abstract -Origin of graphene -Structure

Raman Aggarwal NPRE 498. What is Graphene.....? Single thin layer of pure Carbon Hexagonal Honeycomb Lattice Bond Length of nanometer Interplanar.

An ionic lattice: a giant regular repeating pattern of alternating positive and negative ions in 3D. The packing structure of the ions depends on the relative.

Carbon Allotropes And Its Nanostructures

TRANSPARENT ELECTRONICS

PHYSICAL ELECTRONICS EEE2056

EEE 2056 Physical Electronic Graphene and its application

Graphene and its applications EEE2056 Physical Electronics Trimester 2, 2015/2016 Student ID:

GRAPHENE Thashinavel A/l Suppiah ( ) Major: Electronics.

Lingva Technical English Projects Graphene

Macromolecules (Covalent Network Solids) Last part of Topic 4.3

THE IBY AND ALADAR FLEISHMAN FACULTY OF ENGINEERING

New Technology Noadswood Science, 2016.

Intro To The Periodic Table

Solids: Conductors, Insulators and Semiconductors

GRAPHENe. Introduction  Graphene can be described as a one-atom thick layer of graphite.  It is the basic structural element of other allotropes, including.

Riphah International University, Lahore

Photovoltaic and dye-sensitized solar cells

Quantum Size Effects in Nanostructures

Speaker : Won Il Park, Ph.D

Electric Circuits (12.2).

Electric Circuits (12.2).

Chem. warm-up: What is the difference between an ionic and covalent compounds? Ionic compounds are made of ions (Cations & Anions) and transfer electrons,

Allotropes of Carbon Topic 4.2.

Metallic, Ionic and Network Solids

Metallic Bonds.

Metallic Bond Bond that exists between metal atoms

Chapter 7: Properties of Ionic Covalent and Metal Materials

Hybridisation Some atoms form a different number of covalent bonds than the electron configurations of those atoms might suggest they should form.

Energy: It’s all around us…

Presentation transcript:

PHYSICAL ELECTRONICS EEE2056 TRIMESTER 2, 2015/2016 TITLE: GRAPHENE AND ITS APPLICATIONS

WHAT IS GRAPHENE? Graphene is made of a single layer of carbon atoms that are bonded together in a repeating pattern of hexagons. Graphene is one million times thinner than paper; so thin that it is actually considered two dimensional. Graphene’s flat honeycomb pattern grants it many unusual characteristics, including the status of strongest material in the world.

THE STRUCTURE OF GRAPHENE Graphene is a crystalline allotrope of carbon with 2 dimensional properties. Each carbon has 4 bonds, 1 sigma with each of its 3 neighbor and 1 pi bond i.e. oriented out of the plane. Stability of Graphene is due to its densely packed carbon atoms and an Sp2 orbital hybridization a combination of s and p sigma bonds In graphene, carbon atoms are bonded to only three other atoms.

PROPERTIES OF GRAPHENE ELECTRICAL PROPERTIES Graphene is that it is a zero-overlap semimetal (with both hole and electrons as charge carriers) with high electrical conductivity. MECHANICAL STRENGHT Graphene is the most STRONGEST material ever found, with an extreme elasticity.

PROPERTIES OF GRAPHENE CONTINUE… OPTICAL PROPERTIES Because to the amazing of qualities of graphene, it has been watched that once optical power achieves a certain threshold known as the saturation fluence saturable absorption happens. HEAT PROPERTIES Graphene has to a great degree high intrinsic thermal conductivity. Small expansion of the liquid-phase exfolaited graphene can increase thermal conductivity of composite materials

APPLICATION OF GRAPHENE Graphene quantum dot – light emitting diode Lithium Ion Battery Fuel cell and solar cell Cancer Therapy Ultra-Capacitor Transparent Conductive Films

IS GRAPHENE DANGEROUS? There has been reports about Graphene which classified it as a natural bio-compatible carbon component. However, On account of Graphene, Ken Donaldson is a respiratory toxicologist at the University of Edinburgh and he and his associates are among the first to raise the cautioning banner on Graphene. Usefulness: I have been waiting for some time now to write a headline along the lines of “scientist discover things that graphene is not amazing at” and here it is.it could also be bad for the environment and bad for you, too.