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Characterizing the single-walled car...

Xiao, Zhiwei.

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Characterizing the single-walled carbon nanotube dispersions: Novel methods development and their applications.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Characterizing the single-walled carbon nanotube dispersions: Novel methods development and their applications./
作者:	Xiao, Zhiwei.
面頁冊數:	150 p.
附註:	Source: Dissertation Abstracts International, Volume: 75-01(E), Section: B.
Contained By:	Dissertation Abstracts International75-01B(E).
標題:	Engineering, Materials Science. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3596609
ISBN:	9781303434372

Characterizing the single-walled carbon nanotube dispersions: Novel methods development and their applications.
Xiao, Zhiwei.

Characterizing the single-walled carbon nanotube dispersions: Novel methods development and their applications. - 150 p.

Source: Dissertation Abstracts International, Volume: 75-01(E), Section: B.

Thesis (Ph.D.)--The Florida State University, 2013.

Single-walled carbon nanotubes (SWCNTs) thin films exhibit great potential in various applications thanks to their extraordinary physical and mechanical properties. However, to fully take advantage of their superior properties there are still several barriers to be overcome. On one hand, SWCNTs are rarely found as isolated individual tubes, which makes them very difficult to exfoliate and disperse. On the other hand, SWCNTs are not with perfect defect-free chemical structure, which can severely degrade the intrinsic properties of the pristine SWCNTs and thus deteriorate the various SWCNT based applications. In many cases, when people perform chemical functionalization to SWCNTs, they have to find a balance between the improvement of the dispersability and compatibility of SWCNTs and the degradation of the intrinsic properties of SWCNTs. Therefore, it is crucial to have an easy-to-use and reliable way to characterize and quantify the corresponding structural information of SWCNT in dispersion such as bundle size, bundling state, defect density, etc.

ISBN: 9781303434372Subjects--Topical Terms:

1017759
Engineering, Materials Science.

Characterizing the single-walled carbon nanotube dispersions: Novel methods development and their applications.
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245 1 0 $a Characterizing the single-walled carbon nanotube dispersions: Novel methods development and their applications.
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500 $a Source: Dissertation Abstracts International, Volume: 75-01(E), Section: B.
500 $a Adviser: Tao Liu.
502 $a Thesis (Ph.D.)--The Florida State University, 2013.
520 $a Single-walled carbon nanotubes (SWCNTs) thin films exhibit great potential in various applications thanks to their extraordinary physical and mechanical properties. However, to fully take advantage of their superior properties there are still several barriers to be overcome. On one hand, SWCNTs are rarely found as isolated individual tubes, which makes them very difficult to exfoliate and disperse. On the other hand, SWCNTs are not with perfect defect-free chemical structure, which can severely degrade the intrinsic properties of the pristine SWCNTs and thus deteriorate the various SWCNT based applications. In many cases, when people perform chemical functionalization to SWCNTs, they have to find a balance between the improvement of the dispersability and compatibility of SWCNTs and the degradation of the intrinsic properties of SWCNTs. Therefore, it is crucial to have an easy-to-use and reliable way to characterize and quantify the corresponding structural information of SWCNT in dispersion such as bundle size, bundling state, defect density, etc.
520 $a Two different techniques for in-situ structural characterization of SWCNTs in dispersion have been developed. The Preparative Ultracentrifuge Method (PUM) combined with dynamic light scattering (DLS) technique provides us an approach to investigate the bulk averaged SWCNT bundle size in dispersion. The Simultaneous Raman Scattering and Photoluminescence (SRSPL) technique allows us to study the bundling state/degree of exfoliation of SWCNT in dispersion. Based on the 1D exciton diffusion model, we can also use the SRSPL technique to estimate the defect density of SWCNTs in dispersion. The application of PUM and SRSPL has been demonstrated in studying the structural changes of SWCNT dispersion under different processing (sonication and ultracetrifugation) conditions. It revealed the exfoliation mechanism of SWCNT under sonication technique. Moreover, the developed PUM characterization techniques were further applied to study the interactions between SWCNT and polyacrylonitrile (PAN) homo- and copolymers.
520 $a On the basis of the established PUM and SRSPL characterization methods, my proposed work focuses on an in-depth understanding of the effects of bundling states and defect density on the electrical and mechanical properties of SWCNT thin films. The detailed proposed tasks include: 1) improve the current physical model for quantifying defect density; 2) prepare and characterize the SWCNT dispersions with controlled bundle size and defect density; 3) fabricate and characterize the electrical and mechanical properties of SWCNT thin films to elucidate the effects of bundling state and defect density of SWCNTs in the dispersion.
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