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Shape control and oxidation behavior...

Rice, Katherine Patricia.

Shape control and oxidation behavior of colloidal nanocrystals.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Shape control and oxidation behavior of colloidal nanocrystals.
作者:	Rice, Katherine Patricia.
面頁冊數:	140 p.
附註:	Source: Dissertation Abstracts International, Volume: 73-09(E), Section: B.
附註:	Adviser: Mark P. Stoykovich.
Contained By:	Dissertation Abstracts International73-09B(E).
標題:	Engineering, Chemical.
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3508142
ISBN:	9781267337009

Shape control and oxidation behavior of colloidal nanocrystals.
Rice, Katherine Patricia.

Shape control and oxidation behavior of colloidal nanocrystals. - 140 p.

Source: Dissertation Abstracts International, Volume: 73-09(E), Section: B.

Thesis (Ph.D.)--University of Colorado at Boulder, 2012.

Colloidal nanocrystals have unique physical, optical, and transport properties compared to both molecular systems and bulk materials. Nanocrystals of noble metals such as copper, for example, exhibit a size- and shape-dependent optical response known as the localized surface plasmon resonance (LSPR). We have found that the plasmon response in solution-based copper nanocrystals is solvent-dependent, with solvents containing pi-bond significantly damping the LSPR signal until a monolayer of copper oxide forms on the nanocrystal surface and causes the plasmon signal to return, due to electron donation from the solvent. In addition, the copper LSPR signal can be monitored in-situ and in real time using UV-vis absorbance spectroscopy to study the oxidation of copper to copper oxide. We have determined the oxidation kinetics for Cu as a function of temperature (50--300°C) and, through application of a reaction-diffusion model for oxidation, quantified temperature-dependent diffusion parameters in the Cu/Cu2O system. The Cu2O nanoparticles were also characterized structurally and were found to form hollow shells upon oxidation via a phenomenon known as the nanoscale Kirkendall effect. The hollow Cu 2O nanoparticles were formed at temperatures from &sim;100 to 200°C, but were thermodynamically unstable and collapsed to solid nanoparticles at higher temperatures.

ISBN: 9781267337009Subjects--Topical Terms:

226989
Engineering, Chemical.

Shape control and oxidation behavior of colloidal nanocrystals.
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245 1 0 $a Shape control and oxidation behavior of colloidal nanocrystals.
300 $a 140 p.
500 $a Source: Dissertation Abstracts International, Volume: 73-09(E), Section: B.
500 $a Adviser: Mark P. Stoykovich.
502 $a Thesis (Ph.D.)--University of Colorado at Boulder, 2012.
520 $a Colloidal nanocrystals have unique physical, optical, and transport properties compared to both molecular systems and bulk materials. Nanocrystals of noble metals such as copper, for example, exhibit a size- and shape-dependent optical response known as the localized surface plasmon resonance (LSPR). We have found that the plasmon response in solution-based copper nanocrystals is solvent-dependent, with solvents containing pi-bond significantly damping the LSPR signal until a monolayer of copper oxide forms on the nanocrystal surface and causes the plasmon signal to return, due to electron donation from the solvent. In addition, the copper LSPR signal can be monitored in-situ and in real time using UV-vis absorbance spectroscopy to study the oxidation of copper to copper oxide. We have determined the oxidation kinetics for Cu as a function of temperature (50--300°C) and, through application of a reaction-diffusion model for oxidation, quantified temperature-dependent diffusion parameters in the Cu/Cu2O system. The Cu2O nanoparticles were also characterized structurally and were found to form hollow shells upon oxidation via a phenomenon known as the nanoscale Kirkendall effect. The hollow Cu 2O nanoparticles were formed at temperatures from &sim;100 to 200°C, but were thermodynamically unstable and collapsed to solid nanoparticles at higher temperatures.
520 $a Cadmium selenide (CdSe) and semiconductor nanocrystals also are of great interest because their absorption at UV-vis wavelengths is size- and shape-dependent making them well suited for photovoltaics. Most of the shape control demonstrated for the wurtzite crystal structure of CdSe has previously centered on high aspect ratio rods and tetrapods, due to the inherently elongated unit cell of wurtzite. We have synthesized new nanocrystal morphologies in wurtzite CdSe, including cubes and hexagonal platelets, by controlling reaction conditions such as temperature, precursor concentrations, and the nucleation process through the use of a seeded-growth mechanism. A new algorithm based on the Fourier descriptor method was developed to classify the nanocrystal shapes from transmission electron micrographs and provided high-throughput, quantitative information about shape for each synthetic condition.
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790 1 0 $a Saunders, Aaron E. $e committee member
790 1 0 $a Feldheim, Daniel L. $e committee member
790 1 0 $a Weimer, Alan W. $e committee member
790 1 0 $a Musgrave, Charles B. $e committee member
790 $a 0051
791 $a Ph.D.
792 $a 2012
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