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Physical properties of single walled...

Wu, Yang.

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Physical properties of single walled carbon nanotubes studied by optical spectroscopy.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Physical properties of single walled carbon nanotubes studied by optical spectroscopy./
作者:	Wu, Yang.
面頁冊數:	118 p.
附註:	Adviser: Tony F. Heinz.
Contained By:	Dissertation Abstracts International68-09B.
標題:	Physics, Condensed Matter. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3285202
ISBN:	9780549272311

Physical properties of single walled carbon nanotubes studied by optical spectroscopy.
Wu, Yang.

Physical properties of single walled carbon nanotubes studied by optical spectroscopy. - 118 p.

Adviser: Tony F. Heinz.

Thesis (Ph.D.)--Columbia University, 2007.

In this dissertation, we present our recent studies of the physical properties of single walled carbon nanotubes (SWCNTs) using optical spectroscopy.

ISBN: 9780549272311Subjects--Topical Terms:

1018743
Physics, Condensed Matter.

Physical properties of single walled carbon nanotubes studied by optical spectroscopy.
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100 1 $a Wu, Yang. $3 1271769
245 1 0 $a Physical properties of single walled carbon nanotubes studied by optical spectroscopy.
300 $a 118 p.
500 $a Adviser: Tony F. Heinz.
500 $a Source: Dissertation Abstracts International, Volume: 68-09, Section: B, page: 6030.
502 $a Thesis (Ph.D.)--Columbia University, 2007.
520 $a In this dissertation, we present our recent studies of the physical properties of single walled carbon nanotubes (SWCNTs) using optical spectroscopy.
520 $a The thesis is composed of four main sections focusing on different aspects of the physical properties of SWCNTs: electronic properties, mechanical properties, phonon properties, and ultrafast dynamics.
520 $a We describe the ways in which we have applied Rayleigh spectroscopy to probe the modification of the nanotubes' electronic structure by applying strain or by the deposition of organic molecules on the nanotubes. These two methods effectively tune the band structure of the SWCNTs. Uniaxial strain applied to the suspended SWCNTs changes the electronic structure differently depending on the, chiral index of the nanotube. When we deposited organic molecules onto different semiconducting nanotubes, the electronic resonances all underwent a similar redshift. We also describe the first experimental determination of the Young's modulus of an isolated individual carbon nanotubes of known chirality. The absence of any significant dependence of the nanotubes' elastic properties on their structure confirms previous theoretical predictions. We also demonstrated a mechanical oscillator comprised of carbon nanotubes that operates in the nonlinear regime. A prototype of a bi-stable mechanical device is presented.
520 $a We further present our study of the Raman spectra of the high-energy vibrational modes (HEMs) in metallic nanotubes. We clarified a long-standing controversy by showing that the broadening observed in metallic nanotubes' HEM is intrinsic and directly related to the coupling between phonons and low-energy electronic excitations.
520 $a We also describe the way we studied ultrafast dynamics in individual carbon nanotubes by detecting transient Rayleigh scattering. We probed the ultrafast dynamics at the single nanotube level for both metallic and semiconducting nanotubes. We found that the lifetime of electronic excitations induced by pump pulses are > 3ps and < 1ps for semiconducting nanotube and metallic nanotube respectively. We also deduced that the phonons produced in this transient process are localized, while the electronic excitation migrates rapidly on a micron scale.
590 $a School code: 0054.
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710 2 0 $a Columbia University. $3 571054
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791 $a Ph.D.
792 $a 2007
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