Ajit K.

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Structure and applications of Carbon Nano tubes.

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Ajit K.

  1. 1. 1Carbon Nanotubes: andits applicationsAJIT KUMAR MANDALSEM-IIDEPT. OF BOTANYNORTH ORISSA UNIVERSITY
  2. 2. 2Outline Introduction History Structure Properties Applications Biological application Future application Challenges conclusion
  3. 3. Introduction Current world is comprising of nanotechnology. All the laboratoriesin the world concern with the nanotechnology application. In biological world the nanotechnology plays a vital role for thebetterment of the works. Mainly in the sector of genetics the carbon nano tube is widely used.
  4. 4. 4What is carbon nanotube: A tube shaped material, made of carbonhaving a diameter measuring on thenanometer scale.1nm = 10-9m
  5. 5. 5Types of carbon nanotube: Single-wall Nanotubes Double-wall Nanotubes Multi-wall Nanotubes
  6. 6. 6Structure: The chemical genius of carbon that can be bondin different way to create structures with entirelydifferent properties. Different forms of carbon: Diamond, Graphite, Fullerene,
  7. 7. 7Structure:CNT: Rolling-up a graphene sheet to form a tubeSchematicof a CNTSTM imageof CNT
  8. 8. 8Carbon nanotubeProperties depending on how it is rolled up.a1, a2 are the graphene vectors.OB/AB’ overlaps after rolling up.OA is the rolling up vector.21 manaOA +=
  9. 9. Carbon nanotube properties:FiberMaterialSpecificDensityE(TPa) Strength Strain atBreak(%)CarbonNanotube1.3-2 1 10-60 10HS Steel 7.8 0.2 4.1 Below 10Carbonfiber-PAN1.7-2 0.2-0.6 1.7-5 0.3-2.4Carbonfiber-pitch2-2.2 0.4-0.96 2.2-3.3 0.27-0.6E/S-glass 2.5 0.07/0.08 2.4/2.5 4.8Kevler 49 1.4 0.13 3.6-4.1 2.8
  10. 10. 10Applications of Carbonnanotubes:General applications are: Conductive plastic Structural composite materials Flat-panel displays Gas storage Antifouling paint Micro- and nano electronocs Radar absorbing coating Technical Textiles Ultra-capacitor Batteries with improved lifetime. Extra strong fibers.
  11. 11. 11Biological Applications ofCarbonnanotubes: Atomic Force Microscope (AFM) Tips Biosensors for Harmful gases DNA Sequencing
  12. 12. Biological applications: Bio-sensing Many spherical nano-particles have beenfabricated for biological applications. Nanotubes offer some advantages relativeto nanoparticles by the following aspects:1. Larger inner volumes – can be filled with chemical orbiological species.2. Open mouths of nanotubes make the inner surfaceaccessible.3. Distinct inner and outer surface can be modifiedseparately.
  13. 13. 13Biological applications: AFM tipsCarbon nanotubes as AFM probe tips:1. Small diameter – maximum resolution2. Excellent chemical and mechanical robustness3. High aspect ratioResolution of ~ 12nm is achieved
  14. 14. 14Biological applications:Functional AFM tipsMolecular-recognition AFM probe tips: Certain bimolecular is attached to the CNT tip This tip is used to study the chemical forces betweenmolecules – Chemical force microscopy
  15. 15. 15Biological applications: DNA sequencing Nanotube fits into themajor grove of the DNAstrand Apply bias voltageacross CNT, differentDNA base-pairs giverise to different currentsignals With multiple CNT, it ispossible to do parallelfast DNA sequencingTop view and side view of theassembled CNT-DNA system
  16. 16. 16Future Applications Future applications:1. Already in product: CNT tipped AFM2. Big hit: CNT field effect transistors based nano electronics.3. Futuristic: CNT based OLED, artificial muscles….
  17. 17. 17Conclusion: By the application of carbon nanotubes we can developthe biological research work to such an extent that it canleads our life style beyond the imagination.
  18. 18. 18Challenges: Challenges1. Manufacture: Important parameters are hard to control.2. Large quantity fabrication process still missing.3. Manipulation of nanotubes.
  19. 19. 19Referrence: http://www.personal.reading.ac.uk/~scsharip/tubes.htm en.wikipedia.org/wiki/Carbon_nanotube www.nanocyl.com/CNT-Expertise.../Carbon-Nanotubes www.research.ibm.com/nanoscience/nanotubes.html www.electrochem.org/dl/interface/sum/sum06/sum06_p23.pdf - 

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