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Optical Spectroscopy of Single-Walle...

Searles, Thomas A., Jr.

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Optical Spectroscopy of Single-Walled Carbon Nanotubes Under Extreme Conditions.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Optical Spectroscopy of Single-Walled Carbon Nanotubes Under Extreme Conditions./
作者:	Searles, Thomas A., Jr.
面頁冊數:	117 p.
附註:	Source: Dissertation Abstracts International, Volume: 73-11(E), Section: B.
Contained By:	Dissertation Abstracts International73-11B(E).
標題:	Condensed matter physics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3521364
ISBN:	9781267545428

Optical Spectroscopy of Single-Walled Carbon Nanotubes Under Extreme Conditions.
Searles, Thomas A., Jr.

Optical Spectroscopy of Single-Walled Carbon Nanotubes Under Extreme Conditions. - 117 p.

Source: Dissertation Abstracts International, Volume: 73-11(E), Section: B.

Thesis (Ph.D.)--Rice University, 2011.

This item must not be sold to any third party vendors.

Single-walled carbon nanotubes (SWNTs) are one of the leading candidate materials to realize novel nanoscale photonic devices. In order to assess their performance characteristics as optoelectronic materials, it is crucial to examine their optical properties in highly non-equilibrium situations such as high magnetic fields, low temperatures, and under high photoexcitation. Therefore, we present our latest result on the magnetic susceptibility anisotropy of metallic carbon nanotubes due to the Aharonov-Bohm effect. Here, we performed magnetic linear dichroism on a metallic-enriched HiPco SWNT sample utilizing a 35 T Hybrid Magnet to measure absorption with light polarization both perpendicular and parallel to the magnetic field. By relating these values with the nematic order parameter for alignment, we found that the metallic carbon nanotubes do not follow a strict diameter dependence across the 7 chiralities present in our sample.

ISBN: 9781267545428Subjects--Topical Terms:

3173567
Condensed matter physics.

Optical Spectroscopy of Single-Walled Carbon Nanotubes Under Extreme Conditions.
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245 1 0 $a Optical Spectroscopy of Single-Walled Carbon Nanotubes Under Extreme Conditions.
300 $a 117 p.
500 $a Source: Dissertation Abstracts International, Volume: 73-11(E), Section: B.
500 $a Adviser: Junichiro Kono.
502 $a Thesis (Ph.D.)--Rice University, 2011.
506 $a This item must not be sold to any third party vendors.
520 $a Single-walled carbon nanotubes (SWNTs) are one of the leading candidate materials to realize novel nanoscale photonic devices. In order to assess their performance characteristics as optoelectronic materials, it is crucial to examine their optical properties in highly non-equilibrium situations such as high magnetic fields, low temperatures, and under high photoexcitation. Therefore, we present our latest result on the magnetic susceptibility anisotropy of metallic carbon nanotubes due to the Aharonov-Bohm effect. Here, we performed magnetic linear dichroism on a metallic-enriched HiPco SWNT sample utilizing a 35 T Hybrid Magnet to measure absorption with light polarization both perpendicular and parallel to the magnetic field. By relating these values with the nematic order parameter for alignment, we found that the metallic carbon nanotubes do not follow a strict diameter dependence across the 7 chiralities present in our sample.
520 $a In addition to the studying the absorption properties exhibited at high magnetic field, we performed temperature-dependent (300 K to 11 K) photoluminescence (PL) on HiPco SWNTs embedded in an iota-carrageenan matrix utilizing intense fs pulses from a wavelength-tunable optical parametric amplifier. We found that for each temperature the PL intensity saturates as a function of pump fluence and the saturation intensity increases from 300 K to a moderate temperature around 100-150 K. Within the framework of diffusion-limited exciton-exciton annihilation (EEA), we successfully estimated the density of 1D excitons in SWNTs as a function of temperature and chirality. These results coupled with our results of magnetic brightening, or an increase in PL intensity as a function of magnetic flux through each SWNT due to the Aharonov-Bohm effect, yield great promise that in the presence of a high magnetic field the density of excitons can be further increased.
590 $a School code: 0187.
650 4 $a Condensed matter physics. $3 3173567
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773 0 $t Dissertation Abstracts International $g 73-11B(E).
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791 $a Ph.D.
792 $a 2011
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3521364