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Metal decorated multi-walled carbon nanotube/polyimide composites with high dielectric constants and low loss factors (Document No: 20090028635)
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Smith, Joseph G. Ghose, Sayata Watson, Kent A. Dudley, Kenneth L. Connell, John W. Elliott, Holly A. |
| Copyright Year | 2009 |
| Description | The measurement of observable electromagnetic phenomena in materials and their derived intrinsic electric material properties are of prime importance in the discovery and development of material systems for electronic and aerospace applications. Nanocomposite materials comprised of metal decorated multi-walled carbon nanotubes (MWCNTs) were prepared by a facile method and characterized. Metal particles such as silver, platinum and palladium with diameters ranging from less than 5 to over 50 nanometers were distributed randomly on the MWCNTs. The metal-containing MWCNTs were then melt mixed into a polymer matrix and the mixture extruded as ribbons. These extruded ribbons exhibited a moderate to high degree of MWCNT alignment as determined by HRSEM. These ribbons were then fabricated into test specimens while maintaining MWCNT alignment and subsequently characterized for electromagnetic properties at 8-12 GHz. The present study is focused on silver decorated MWCNTs dispersed in an Ultem polyimide matrix. The results of the electromagnetic characterization showed that certain sample configurations exhibited a decoupling of the permittivity and loss factor (?? and ??) indicating that these properties could be tailored within certain limits. The decoupling and independent control of these fundamental electrical material parameters offer a new class of materials with potential applications in electronics, microwave engineering and optics. |
| File Size | 2048149 |
| Page Count | 10 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20090028635 |
| Archival Resource Key | ark:/13960/t6644qp39 |
| Language | English |
| Publisher Date | 2009-07-27 |
| Access Restriction | Open |
| Subject Keyword | Nonmetallic Materials Silver Dielectric Loss Scanning Electron Microscopy Nanocomposites Electrical Properties Polyimides Carbon Nanotubes Dielectrics Permittivity X Ray Diffraction Electromagnetic Properties Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
