Graphene better then diamond
This presentation is the property of its rightful owner.
Sponsored Links
1 / 9

Graphene better then Diamond PowerPoint PPT Presentation


  • 140 Views
  • Uploaded on
  • Presentation posted in: General

Graphene better then Diamond. Graphene and diamond is made of pure carbon. Properties of the nanodiamond. Nanodiamond: synthesized by the detonation; narrow size distribution; diamond-like; Widely used in the industry

Download Presentation

Graphene better then Diamond

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Graphene better then diamond

Graphene better then Diamond

Graphene and diamond is made of pure carbon


Properties of the nanodiamond

Properties of the nanodiamond

Nanodiamond:

  • synthesized by the detonation;

  • narrow size distribution;

  • diamond-like;

  • Widely used in the industry

    Nanodiamond: Structure: sp3 carbon bond has π electron networks;

    unconventional magnetism around thegraphene/diamond interface;

    Nanographine: Non bonding π electron state ==> rise of unconventional nanomagnetism;


Diamond to graphite

Diamond-to-graphite

Diamond-to-graphite conversion in nanodiamond and electronic properties of nanodiamond-derived carbon system.

Heat-treatment-induced (HTT-Heat treatment temperature) conversion of nanodiamond to nanographite is investigated.

  • Graphitization starts at 900C;

  • proceeds inward in the particle;

  • completed around 1600C, were a nanodiamond particle converted to a single nanographene sheet;

    Analysing:

  • Structure; electronic aspects; X-Ray diffraction; high resolution transmission electron micro-scope (HRTEM), scanning electron microscope (SEM),Raman scattering, scanning tunneling microscope (STM), atomic force microscope (AFM), magnetic susceptibility and ESR. E


Structural parameters

Structural parameters

  • Shape of nanographine particle;

  • Particle forms Polyhedron of size ca 7nm and a hollow inside;

  • Regularity of graphitic structure;

  • Turbostatic nature of the graphene sheets;


Electronic properties

Electronic properties

The electronic properties described analysing magnetic properties.

  • Extended π – electron system;

  • π – electron spins coupled;

  • Accelerated spin-lattice relaxation process;


Electronic properties cont

Electronic properties cont.

  • Minimal defects;

  • Disordness of graphite;

  • Stiffennes of the graphitic lattice;

  • Partly vacant π-band bonding - holes;

  • Reduction of the orbital susceptibility


Formation of isolated single nanographene layer

Formation of isolated single nanographene layer

  • Electrophoretic deposition

  • Successive heat treatment of isolated nanodiamond particles is expected to produce isolated nanographite particles on a substrate.

  • obtained particle can be assigned to a single nanographene sheet laying flat on the HOPG (highly oriented pyrolytic graphite) substrate.

  • Nanodiamond particles when simply heated at 1600C yields the polyhedral nanographite particles

  • First observation of a single nanographene sheet.


Images of the nanodiamond and nanographie particles using electrophoretic deposition

Images of the nanodiamond and nanographie particles using electrophoretic deposition


Graphene future in today s industry

Graphene future in today's industry

Paper-like graphene:

  • Flexible;

  • tougher than diamond;

  • lighter then most metals;

  • different electrical properties.

    Graphene can be used:

  • touch screens;

  • solar cells;

  • energy-storage devices;

  • cell phones;

  • high-sped computer chips.

    Graphene may be the ticket to major technological breakthrough;

    “It is the thinnest known material in the universe, and the strongest ever measured,” wrote University of Manchester physicist Andre Geim in Science.


  • Login