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Spectroscopic and electronic study o...

New Mexico State University.

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Spectroscopic and electronic study of carbon nanotubes and carbon nanotubes composites.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Spectroscopic and electronic study of carbon nanotubes and carbon nanotubes composites./
作者:	Talla, Jamal A.
面頁冊數:	193 p.
附註:	Adviser: Seamus Curran.
Contained By:	Dissertation Abstracts International68-10B.
標題:	Chemistry, Polymer. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3284873
ISBN:	9780549272953

Spectroscopic and electronic study of carbon nanotubes and carbon nanotubes composites.
Talla, Jamal A.

Spectroscopic and electronic study of carbon nanotubes and carbon nanotubes composites. - 193 p.

Adviser: Seamus Curran.

Thesis (Ph.D.)--New Mexico State University, 2007.

This thesis is focused on understanding the consequences of functionalizing carbon nanotubes by use of both Raman Spectroscopy and Transport mechanisms. Defects were introduced regularly onto the body of both multi-walled carbon nanotubes (MWCNTs) and single-walled carbon nanotubes ( SWCNTs) by a carboxylation process. Changes in the vibrational response of these modified nanotubes were studied by resonance Raman spectroscopy. The D, D' and G modes are most prominent and responsive to defect formation caused by carboxylation. Such modes show dispersive behavior at different excitation wavelengths as expected from the double resonance Raman mechanism. Several weaker Raman resonances were also observed at different excitation wavelengths. In addition, weak vibrational modes corresponding to Stone Wales defects with specific structures known as Haeckelite structures were identified by fingerprint matching the observed Raman resonances with the theoretically calculated ones, showing a close correlation for O567, Hs67 and R57 Haeckelite structures.

ISBN: 9780549272953Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Spectroscopic and electronic study of carbon nanotubes and carbon nanotubes composites.
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245 1 0 $a Spectroscopic and electronic study of carbon nanotubes and carbon nanotubes composites.
300 $a 193 p.
500 $a Adviser: Seamus Curran.
500 $a Source: Dissertation Abstracts International, Volume: 68-10, Section: B, page: 6730.
502 $a Thesis (Ph.D.)--New Mexico State University, 2007.
520 $a This thesis is focused on understanding the consequences of functionalizing carbon nanotubes by use of both Raman Spectroscopy and Transport mechanisms. Defects were introduced regularly onto the body of both multi-walled carbon nanotubes (MWCNTs) and single-walled carbon nanotubes ( SWCNTs) by a carboxylation process. Changes in the vibrational response of these modified nanotubes were studied by resonance Raman spectroscopy. The D, D' and G modes are most prominent and responsive to defect formation caused by carboxylation. Such modes show dispersive behavior at different excitation wavelengths as expected from the double resonance Raman mechanism. Several weaker Raman resonances were also observed at different excitation wavelengths. In addition, weak vibrational modes corresponding to Stone Wales defects with specific structures known as Haeckelite structures were identified by fingerprint matching the observed Raman resonances with the theoretically calculated ones, showing a close correlation for O567, Hs67 and R57 Haeckelite structures.
520 $a Further study in chemically purified CVD grown on both MWCNTs and Nitrogen (N) doped MWCNTs with poly(bisphenol A carbonate) (PC) composites were carried out. Both Raman spectroscopy and electrical measurements of the composite material were studied. The electrical conductivities of the composites can be described by the scaling law based on percolation theory with unprecedented high saturated conductivities both from DC and AC conductivity measurements. We attribute such high saturated conductivities to the enhanced dispersion of MWCNT/N-MWCNTs in the PC matrix through favorable pi-pi* interactions between the aromatic structural units of PC and MWCNT/N-MWCNT as well as the enhanced conductivity of MWCNT/N-MWCNT through chemical doping. In comparison, MWCNT/N-MWCNTs and PC composites exhibit only modest saturated conductivity as a result of limited interaction between polymer backbone and MWCNT/N-MWCNTs.
590 $a School code: 0143.
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