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Enhancing CNT Composites with Raman Spectroscopy
| Title: | Enhancing CNT Composites with Raman Spectroscopy. |
 41 views 16 downloads |
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| Name(s): |
Freihofer, Gregory, Author Raghavan, Seetha, Committee Chair Gou, Jihua, Committee Member Zhai, Lei, Committee Member , Committee Member University of Central Florida, Degree Grantor |
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| Type of Resource: | text | |
| Date Issued: | 2011 | |
| Publisher: | University of Central Florida | |
| Language(s): | English | |
| Abstract/Description: | Carbon Nanotubes (CNTs) have been the subject of intense research for their potential to improve a variety of material properties when developed as nano-composites. This research aims to address the challenges that limit the ability to transfer the outstanding nano-scale properties of CNTs to bulk nano-composites through Raman characterization.These studies relate the vibrational modes to microstructural characterization of CNT composites including stress, interface behavior, and defects. The formulation of a new fitting procedure using the pseudo-Voigt function is presented and shown to minimizethe uncertainty of characteristics within the Raman G and D doublet. Methods for optimization of manufacturing processes using the Raman characterization are presentedfor selected applications in a polymer multiwalled nanotube (MWNT) composite andlaser-sintered ceramic-MWNT composite. In the first application, the evolution of theMWNT microstructure throughout a functionalization and processing of the polymer-MWNT composite was monitored using the G peak position and D/G intensity ratio.Processing parameters for laser sintering of the ceramic-MWNT composites were optimized by obtaining maximum downshift in stress sensitive G-band peak position, whilekeeping disorder sensitive D/G integrated intensity ratio to a minimum. Advanced Raman techniques, utilizing multiple wavelengths, were used to show that higher excitationenergies are less sensitive to double resonance Raman effects. This reduces their ininfluence and allows the microstructural strain in CNT composites to be probed more accurately. The use of these techniques could be applied to optimize any processing parameters in the manufacturing of CNT composites to achieve enhanced properties. | |
| Identifier: | CFE0004110 (IID), ucf:49098 (fedora) | |
| Note(s): |
2011-12-01 M.S.A.E. Engineering and Computer Science, Mechanical, Materials and Aerospace Engineering Masters This record was generated from author submitted information. |
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| Subject(s): | CNT composites -- MWNTs -- Raman spectroscopy -- manufacturing | |
| Persistent Link to This Record: | http://purl.flvc.org/ucf/fd/CFE0004110 | |
| Restrictions on Access: | public 2011-12-15 | |
| Host Institution: | UCF |
