Electromagnetic wave absorption and properties of carbon nanocoils and carbon microcoils
Date Issued
2011
Date
2011
Author(s)
Li, Zhao-De
Abstract
Carbon coils have attracted considerable attention and widely studied in electromagnetic field, because of their excellent electromagnetic property and high tensile strength, In general, the electromagnetic wave loss can be divided into reflection loss and absorption loss. The most common example of reflection loss is metal. In this study, we hope through experiments to confirm that carbon coils are absorption loss. And find out the size of carbon coils effect for electromagnetic wave absorption.
A facile and robust method to grow carbon coils will be important. Methods to grow different size of carbon coils have been explored previously, but these entailed complicated processes. Therefore, we use the Fe3O4 and SnO2 to synthesize carbon coils by thermal chemical vapor deposition, and omit the annealing process. It is not only reduce the growth time but also successfully synthesize carbon nanocoils (CNCs) and carbon microcoils (CMCs) by controlling the temperature.
In addition, in the electromagnetic experiments (18~75 GHz), we find that the size of carbon coils play a key role for electromagnetic wave absorption. CNCs have the better absorption of electromagnetic wave in 18~30 GHz, otherwise, CMCs have the better absorption of electromagnetic wave in 30~75 GHz.
Subjects
carbon nanocoils
carbon microcoils
electromagnetic wave absorption
catalyst size
temperature
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-100-R98522607-1.pdf
Size
23.54 KB
Format
Adobe PDF
Checksum
(MD5):a98a8cb0bc1817ce01900528118d017e