University of Jyväskylä | JYX Digital Repository

  • English  | Give feedback |
    • suomi
    • English
 
  • Login
JavaScript is disabled for your browser. Some features of this site may not work without it.
View Item 
  • JYX
  • Opinnäytteet
  • Väitöskirjat
  • View Item
JYX > Opinnäytteet > Väitöskirjat > View Item

Spectroscopic studies of semiconducting single-walled carbon nanotubes

Thumbnail
View/Open
2.5 Mb

Downloads:  
Show download detailsHide download details  
Published in
Research report / Department of Chemistry, University of Jyväskylä
Authors
Siitonen, Anni
Date
2010
Discipline
Kemia

 
The unique nature of optical properties of single-walled carbon nanotubes (SWCNT), together with their promising potential applications, have created enormous interest towards the photophysics of SWCNT. Many aspects of carbon nanotubes originate from the electronic structure of carbon honeycomb lattice and one-dimensionality. SWCNTs exist in various chiral structures and diameters, which the optical and electrical properties are dependent on. It has been discovered that SWCNT excited states are excitonic with strong Coulomb interaction between the electron and the hole. However, many features of excitons are not yet well defined, such as absorption cross-sections, fluorescence quantum yields, exciton lifetimes, and the nature of exciton mobility. The cylindrical shape with all atoms on the surface makes SWCNTs highly sensitive to environment which is a significant factor affecting the optical properties. First part of this thesis concentrates on the temperature dependence of excitonic absorption transitions. The importance of this study lies in the complexity of environmentally induced mechanisms to alter the energy gap and shift the electronic absorption transitions as a function of temperature. The results revealed abrupt shift in the energy gap interpreted to originate from interactions with water. The second part discusses the processes occurring after absorption: exciton mobility and dynamics. By analyzing reactions between single-molecule diazonium salt and individual nanotubes, the distance travelled by exciton during its lifetime, in different surfactants and for different chiral structures was determined. The results indicate that localized excitons have diffusional motion along the nanotube axis. The large diffusion ranges obtained (160 - 340 nm) explain the sensitivity of SWCNT emission to changes in local environment. The dynamics of excitons were studied with excitation dependence measurements. Results revealed the existence of long lived states that act as quenchers of emission even at relatively low excitation intensities. ...
Publisher
University of Jyväskylä
ISBN
978-951-39-4063-8
ISSN Search the Publication Forum
0357-346X
Keywords
eksitonin diffuusio hiilinanoputket Fourier transform infrared (FTIR) spectroscopy exciton diffusion exciton dynamics fluorescence spectroscopy fluorescence microscopy carbon nanotubes spectroscopy fysikaalinen kemia optiset laitteet spektroskopia fluoresenssi absorbtio lämpötila liuottimet kemialliset reaktiot
URI

http://urn.fi/URN:ISBN:978-951-39-4063-8

Metadata
Show full item record
Collections
  • Väitöskirjat [3295]

Related items

Showing items with similar title or keywords.

  • Individual arc-discharge synthesized multiwalled carbon nanotubes probed with multiple measurement techniques 

    Ahlskog, Markus; Hokkanen, Matti J.; Levshov, Dmitry; Svensson, Krister; Volodin, Alexander; van Haesendonck, Chris (American Institute of Physics, 2020)
    Arc-discharge synthesized multiwalled carbon nanotubes (AD-MWNT), or related MWNTs, exhibit a good quality compared to the more common type of MWNT synthesized by catalytic chemical vapor deposition methods. Yet experimental ...
  • Combined electrical transport and Raman measurements of individual single-walled carbon nanotubes 

    Herranen, Olli (2009)
  • Optimizing geometry of low-Q all-metal Fabry-Pérot microcavity for fluorescence spectroscopy 

    Dutta, Arpan; Tiainen, Ville; Toppari, J Jussi (IOP Publishing, 2021)
    Fluorescence spectroscopy is commonly employed to study the excited-state photophysics of organic molecules. Planar Fabry-Pérot microcavities play an essential role in such studies and a strategic cavity design is necessary ...
  • Electronic and vibrational spectroscopic studies of gold-nanoclusters 

    Koivisto, Jaakko (University of Jyväskylä, 2016)
    Gold nanoclusters are a peculiar new material with properties between that of bulk metal and single atoms. They show size-dependent evolution of optical and electronic properties sensitive to the change of single atom ...
  • Experimental and computational studies of unconventional main group compounds : stable radicals and reactive intermediates 

    Hurmalainen, Juha (University of Jyväskylä, 2017)
    Ever since their discovery, radicals have intrigued the minds of experimental and theoretical chemists alike. While the vast majority of radicals are transient species, a large number of stable and persistent radicals ...
  • Browse materials
  • Browse materials
  • Articles
  • Conferences and seminars
  • Electronic books
  • Historical maps
  • Journals
  • Tunes and musical notes
  • Photographs
  • Presentations and posters
  • Publication series
  • Research reports
  • Research data
  • Study materials
  • Theses

Browse

All of JYXCollection listBy Issue DateAuthorsSubjectsPublished inDepartmentDiscipline

My Account

Login

Statistics

View Usage Statistics
  • How to publish in JYX?
  • Self-archiving
  • Publish Your Thesis Online
  • Publishing Your Dissertation
  • Publication services

Open Science at the JYU
 
Data Protection Description

Accessibility Statement

Unless otherwise specified, publicly available JYX metadata (excluding abstracts) may be freely reused under the CC0 waiver.
Open Science Centre