1. Shamil Baldeosingh Dasney Joseph Walter McKinley March 4 th, 2010 EML 4905 Senior Design Project Advisor: Dr. K. H. Wu March 24, 2010 1

2.  Background  Problem Statement  Design Specifications  Conceptual Designs  Project Management  Future Plans 2

3.  Chemical Vapor Deposition ( CVD )  Widely used for engineering applications Scalable to industrial production 20-100 % yield Controllable parameters to determine properties 3

4.  Large Research Interest  Properties Mechanical Electrical Thermal Novel Applications  Variations Dimensions and Geometry Quality and Yield Zhao et al., Physical Review Letters,Physical Review Letters 4

5.  CNT synthesis for current CVD system  3 hours for sample size of 1 – 5 grams ▪ Furnace heating of entire reaction chamber ▪ Such a large sample size is not necessary for research  CNT synthesis for proposed CVD system  0.5 hours for sample size of less than 1 gram ▪ Localized heating of gases and substrate ▪ Appropriate for research applications 5

6.  Preheated Gas Temperature At least 400 ̊c  Substrate Temperature 600-1000 ̊c 6

7.  Packaging  Accessibility  Substrate should be easily loaded  Maintenance of system  Gas flow  Reynolds number << 2100 : Laminar Flow  Peclet number << 1  Knudsen number > 1 7

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11. Design A Straight Tube Design B Variable Cross Section Tube Design C Cube Packaging 441 Accessibility 551 Gas Flow 324 Price 125 Excellent – 1Very Good -2 Good – 3Fair – 4Poor - 5 11

12.  Substrate Material Wafer Powder  Resistive Heating Element Material Configurations Life span  Thermal Strength Thermal Shock Thermal Expansion Deflection  Power Input AC vs. DC H-Current/ L-Voltage L-Voltage/H-Current 12

13.  Heat Generation  Dasney Joseph  Instrumentation and Fluid Mechanics  Shamil Baldeosingh  Conceptual Designs and Prototype  Walter McKinley 13

14. Gantt Chart -Spring 2010 14

15. 15 Gantt Chart - Fall 2010

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17.  Design Modeling SolidWorks  Simulation ANSYS CFX ▪ Fluid Mechanics ▪ Heat Transfer from Resistive Heating Elements  Instrumentation and Control LabVIEW Thermocouple Infrared Temperature Sensor Mass Flow Controller  Prototype Testing Scanning Electron Microscope ( SEM ) ▪ Verify growth of CNT’s 17

18.  Dr. Wu ( Florida International University )  Amit Datye ( Oak Ridge National Laboratory )  John Hart ( Massachusetts Institute of Technology ) 18

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