Carbon nanotube Fibers (CNTFs)

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Carbon nanotube Fibers (CNTFs)

  1. 1. Synthesis and Characterization of Carbon Nanotube Fibers (CNTFs) Using Horizontally Spinning Fibers in Chemical Vapor Deposition (CVD) Technique By Prengki Pransisco MSc By Research
  2. 2. OUT LINES
  3. 3. INTRODUCTION
  4. 4. Continue  Detection Hydrocarbon in deep water is using HED (horizontal electric Dipole) made from Al (Aluminum) Rod with controlled source electromagnetic.  This technique is not effective to detection of hydrocarbon in shallow waters, because of the limited strength of conventional HED source.  Due to the critical issue, the improvement HED is needed.  One of way to improve the technique is to find the good material to improvement the performance of design HED EM transmitter.  Carbon nanotube Fibers (CNTFs) is proposing to use in Design of EM transmitter because of CNTFs has a lot of superb properties, such as remarkable mechanical stiffness, High current capacity, high electrical conductivity, high thermal conductivity and High tensile Strength(Rodney S Ruof et al, 1995).
  5. 5. Continue  To synthesis the CNTFs is another critical issue, various method have been proved to synthesis the material.  The most common method to synthesis carbon nanotubes (CNTs) are:   Which one will be going to use? Arc Discharge Pulsed Laser Ablation Chemical Vapor Deposition
  6. 6. Continue  This Research will be use Chemical Vapor Deposition (CVD) Method, why?  Arc discharge, Pulsed laser ablation methods normally require High amount of Energy for CNTs formation, the energy is provided through laser or plasma arch discharge to organize the Carbon atoms into CNTs and sometimes these methods require high temperature about 300 C, so both of these method need high cost.  In order to get the fibers of CNTs, will be use Horizontally Spinning technique. This technique is a new in term to get the fibers of CNTs.  There are so many challenges in this technique beside parameters on CVD, including: gravitation force, turbulence of carrier gas must be considered
  7. 7. Literature Review What is CNTs ? Carbon nanotubes is Nano-size cylinder of carbon atoms Carbon nanotubes were discovered by sumio Iijima, in 1991, its about 22 years ago by used Arc discharge synthesis method Carbon nanotubes (CNTs) is a strongest and the most flexible material, because it has modulus young’s of the order of terapascal, hardest material known and its also has tensile strength about 200 GP, its 100 times stronger than steel
  8. 8. Continue  There are two type of CNTs :  Single walled has a wall one atom thick and diameter typically 1.4 nm and 200+ nm in length (I. Kang et. Al, 2006)  Multi walled has multiple wall and diameter typically 10 nm and 1- 20 micrometer Length. (I. Kang et. Al, 2006) Single walled CNTs Multi walled CNTs
  9. 9. Continue  Another Shape of SWNTs if its Rolled into a tube
  10. 10. Continue  The “armchair” structures, with a = 30°, have metallic character  The “zigzag” tubes, for which a = 0°, can be either semimetallic or semiconducting, depending on the specific diameter.  Nanotubes with chiral angles intermediate between 0 and 30° include both semimetals and semiconductors. (“Armchair” and “zigzag” refer to the pattern of carbon–carbon bonds along a tube’s circumference.)  So, by determining the structure of CNTs actually the electrical conductivity can be shown.  What kind of application that the CNTs can be used ?
  11. 11. Continue Application of CNTs : 1.Nano electronic Device 2.Electrochemical double layer capacitors 3.Field Emitters 4.Functional emitters 5.Hydrogen Storage 6.Sensors 7.Medical Application, etc However, there is no one until now using CNTs for EM Transmitter Application.
  12. 12. Continue What is CNTFs? Actually Both of CNTs and CNTFs are almost same under the SEM, Both are similar to a hollow cylinder. The different is CNTs made up of unbroken graphene sheet, otherwise CNTFs is made up from broken graphene sheet, means that CNTFs is CNTs in form of fibers from CNTs. (Mukul kumar, 2010) How to produce the Fibers? The most direct technique for spinning of CNT Fibers was developed by Windle’s group at University of Cambridge, this method relies on drawing CNTFs directly and continuously from CVD synthesis Zone.
  13. 13. Continue  (Koziol et al, 2009) were developed controlled method for continuous spinning of fibers from CVD reactor with different nanotube orientation based on liquid condensation and drawing from CVD reactor.  (Jiang Jia et al. 2010) were synthesis CNTFs using CVD and draw and twist the fibers aligned CNTs arrays.  The result is there are CNTFs with different structure because of using two different CVD method
  14. 14. Continue  (Li song et al, 2012) were offer new technique to spin the fibers of the CNTs, they were utilizing a motorized pulling or twisting technique.  In this Research will offer new technique to spin the fibers i.e. using horizontally spinning fibers in CVD reactor, where the CNTs will be deposited in CVD chamber and then direct pulled and twist the fibers.
  15. 15. Continue What is CVD actually ? CVD (Chemical Vapor Deposition) is a popular technique of growing thin films of various materials, a large variety of crystalline and amorphous materials can be grown by this method. Even if CVD is establish deposition technique since early as 1950s, But until now this method still in used because of relative ease of creating material of wide range, tend to be low cost that other method and high purity. There are Various CVD: 1. PE CVD (Plasma enhanced CVD) 2. Thermal CVD 3. Vapor Phase Growth
  16. 16. Continue  This research will be used thermal chemical vapor deposition because of this method tend to be more easy to conduct and to get the fibers.  There are parameters in growing CNTs in CVD method: 1. Carbon Source 2. Catalyst 3. Temperature 4. Flow rate  All of the parameters have an important role in growing aligned of CNTs
  17. 17. Problem Statement To development high performance of EM Transmitter is needed material with high remarkable properties, CNTFs is proposed to use as the material. However, in order to get the Fibers of CNTs is needed right technique to reduce Defect in the CNTFs.
  18. 18. Research Objective 1. To synthesize of carbon nanotube fibers (CNTFs) with horizontally spinning technique chemical vapor deposition (CVD). 2. To Characterize the characteristic microstructure of CNTFs by using SEM (Scanning Electronic Microscope) 3. To Investigate properties of the CNTFs in term of Electrical Conductivity.
  19. 19. Scope Of Study Scope of study in this research are synthesis and characterization of carbon nanotube fibers (CNTFs) Horizontally Spinning Fibers in Chemical Vapor Deposition Technique.
  20. 20. METHODOLOGY  Preparation of the catalyst Catalyst has a strong effect on nanotube diameters, growth rate, wall thickness, morphology and micro structure of CNTs, In this research Fe (Iron) will be used as a catalyst, it will be annealed in vacuum (~10-8 Torr) at ~850oC for 10 minutes to promote the formation of discrete Fe island. After that the specimen is placed in a quartz boat the boat is positioned in a CVD reaction furnace.  Growing Carbon nanotubes (CNTs) and Spinning into carbon nanotube fibers (CNTFs) Put sample in the boat Plug on the supply Set Temperature (800-1200 C) Set voltage (200 V) Pass the carrier gas (Ar) Pass the carbon source methane (CH4) CNTs will be deposited on the substrate CNTs is ready to pulled and twist (spinning).
  21. 21. Continue  Characterization Using SEM (Scanning Electron Microscope) The aim of this stage is to investigate characteristic microstructure of CNTFs, with high energy of beam electron in raster scan pattern from the SEM, CNTFs will be viewed the characteristic such as topography, morphology, shape, size and other properties like electrical conductivity.
  22. 22. Continue  Research Flow Chart EQUIPMENT SET UPEQUIPMENT SET UP PREPARATION CARBON SOURCE AND CATALYST PREPARATION CARBON SOURCE AND CATALYST GROWING CARBON NANOTUBE FOREST SPINNING CNTFs GROWING CARBON NANOTUBE FOREST SPINNING CNTFs Analysis Defect of CNTFs Analysis Defect of CNTFs YES NO CHARACTERYZATION MICROSTRUCTURE OF CNTFs USING SEM CHARACTERYZATION MICROSTRUCTURE OF CNTFs USING SEM VALIDATION AND DISCUSSIONVALIDATION AND DISCUSSION
  23. 23. Continue  Gant Chart Item Research Activities 2013 2014 3 4 5 6 7 8 9 10 11 12 1 2 3 4 5 6 7 8 9 1 Literature Review for carbon nanotube fiber                                       2 Set up equipment, preparation catalyst and carbon source                                       3 Growing carbon nanotube (CNTs) and spinning CNTFs                                       5 Characterization Carbon Nanotube Fibers Using SEM                                       6 Analysis and Validation                                       7 Conference Submission                                       8 Thesis Writing Up                                      
  24. 24. Continue  Milestone ITEM MILESTONE DATE OF COMPLETION 1 Literature review August 2013 2 Preparation Catalyst September 2013 3 Growing CNTs and spinning CNTFs November 2013 4 Characterization of the CNTFs January 2013 5 Analysis and Validation result March 2014 6 Final Report May 2014
  25. 25. References

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