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Electron energy-loss spectroscopy of...

Wang, Feng.

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Electron energy-loss spectroscopy of nanostructures.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Electron energy-loss spectroscopy of nanostructures./
作者:	Wang, Feng.
面頁冊數:	143 p.
附註:	Source: Dissertation Abstracts International, Volume: 68-07, Section: B, page: 4567.
Contained By:	Dissertation Abstracts International68-07B.
標題:	Physics, Condensed Matter. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NR29763
ISBN:	9780494297636

Electron energy-loss spectroscopy of nanostructures.
Wang, Feng.

Electron energy-loss spectroscopy of nanostructures. - 143 p.

Source: Dissertation Abstracts International, Volume: 68-07, Section: B, page: 4567.

Thesis (Ph.D.)--University of Alberta (Canada), 2007.

In studies of nanostructural materials, electron energy-loss spectroscopy (EELS) shows its specific advantage of high spatial resolution in chemical analysis, by a spectrometer in a transmission electron microscope (TEM). Energy loss near-edge structure (ELNES) in ionization edges can provide information on the local valence (or bonding) state and coordination of the excited atom. In this study, the spectral features of ELNES were interpreted using a real-space multiple scattering (RSMS) approach. The appearance of a "postpeak" (a broad post-edge peak above L-edge) or prepeak is shown to be a characteristic of transition metals in an oxidized state, by the experiments and RSMS calculations. These peaks provide a convenient and sensitive test in checking interfacial oxidation of metallic nanoparticles embedded in a matrix.

ISBN: 9780494297636Subjects--Topical Terms:

1018743
Physics, Condensed Matter.

Electron energy-loss spectroscopy of nanostructures.
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300 $a 143 p.
500 $a Source: Dissertation Abstracts International, Volume: 68-07, Section: B, page: 4567.
502 $a Thesis (Ph.D.)--University of Alberta (Canada), 2007.
520 $a In studies of nanostructural materials, electron energy-loss spectroscopy (EELS) shows its specific advantage of high spatial resolution in chemical analysis, by a spectrometer in a transmission electron microscope (TEM). Energy loss near-edge structure (ELNES) in ionization edges can provide information on the local valence (or bonding) state and coordination of the excited atom. In this study, the spectral features of ELNES were interpreted using a real-space multiple scattering (RSMS) approach. The appearance of a "postpeak" (a broad post-edge peak above L-edge) or prepeak is shown to be a characteristic of transition metals in an oxidized state, by the experiments and RSMS calculations. These peaks provide a convenient and sensitive test in checking interfacial oxidation of metallic nanoparticles embedded in a matrix.
520 $a Novel processes were developed in nanofabrication, including in-situ fabrication of iron nanoparticles by electron-induced decomposition of iron fluorides, fabrication of stable iron nanoparticles embedded in a silica matrix through multilayer route, and synthesis of regular arrays of silicon oxide nanowires from a patterned reagent. ELNES methods developed here were used to monitor the evolution of the phase state of iron during electron beam irradiation of iron fluorides in a TEM, check the oxidation state of iron nanoparticles embedded in a silica matrix and encapsulated at the end of nanowires. The results provide an explanation of the magnetic properties of the iron nanoparticles that were characterized using Lorentz microscopy, the magneto-optical Kerr effect and a physical-properties measurement system. The growth mechanism of silicon oxide nanowires is also discussed in relation to the microstructural and electronic analysis in TEM.
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