Transcript Poster4x8_uc02

Surface Modification of Carbon Nanotubes for Nano Transformer
Cuong
1School
1
Diep ,
Milena
2
Fernandez ,
Dr. Vesselin
1
Shanov ,
Dr. Noe
1
Alvarez
of Energy, Environmental, Biological and Medical Engineering, 2School of Electronic and Computing Systems
University of Cincinnati, Cincinnati, OH, 45221
Introduction
The Carbon Nanotube (CNT) is an interesting type of material due to its
superior strength, and electrical conductivity[1]. CNTs are grown by a
chemical vapor deposition (CVD) process in a pressurize chamber. It is a
promising electrochemical technology that can possibly replace the use of
other conductive materials which face different disadvantages.
Doping
This process is in which impurity junctions are added into a semiconductor
wafer in order to form regions of conflicting electrical conductivity.[2] For
this project we had mixed an acid with water, creating a reaction. The
oxidation of the acid releases a charge that attaches itself onto the surface
of the carbon nanotubes, increasing their conductivity.
Coating
Fig. 2: Resistivity vs. Diameter plot for 57 oC Sample
Objectives
1.Design transformer.
2.Modify CNT threads by the processes of doping and coating.
3.Integrate modified threads within transformer.
4.Connect transformer to a power supply.
5.Using transformer, power a light source.
Transformer
This is the insulation process in which we first use nylon to uniformly
coat the CTN threads’ surface area. Once this coating dries, it starts
to become brittle and flakes itself off. The thread is then completely
coated a second time with nitrile.
An electrical device used to transfer alternating current from one circuit to
another due to electromagnetic
induction.
It is used to regulate
voltage/current dependent on the number of windings per coil.
Fig.1: Toroid transformer.
(Top winding is an
insulated copper wire and
bottom winding is a CNT
thread).
Fig.3:Input Voltage vs. Output Voltage of the copper to copper toroid
transformer
Fig4:Input Voltage vs. Output Voltage of the copper to CNT thread toroid
transformer
Conclusion
Results
e.g. A step down transformer installed on a telephone pole in a
neighborhood used to reduce the voltage delivered to homes to avoid high
dangerous voltage from electrocuting an individual.
Densification
This is the soaking of the CNT thread in solution with water for a period of
time. This process allows the CNT thread to increase its diameter and
improve its strength.
Material
Average
Resistivity (Ω 
m)
CNT (Nitric
Acid)
1.12*10-5
CNT (Sulfuric
Acid)
1.20*10-5
Copper
1.68*10-6
Table 1:
This data shows the advances in resistivity for CNT threads.
The improvements in surface modification of CNT threads has enhanced their
properties. Thus, allowing us to use CNT threads in many different electrical
applications. This development will be cost effective , lighter in weight, and
possesses a better quality material.
References
[1] Shi, Z., Wang, Z., Gu, Z., Pristine and Filled Double-Walled Carbon
Nanotubes. (2010)
[2] (2005). “Device Fabrication.” United States Department of Labor,<http://
www.OSHA.gov> (Nov. 20, 2012).
Acknowledgement
Dr. Vesselin Shanov - [email protected]
Dr. Noe [email protected]
Nick Kienzleil
Doug Hurd