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Self-assembled thin films of semicon...

Mwaura, Jeremiah Kamau.

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Self-assembled thin films of semiconducting zinc (II) and terbium (III) chelates for optoelectronics applications.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Self-assembled thin films of semiconducting zinc (II) and terbium (III) chelates for optoelectronics applications./
作者:	Mwaura, Jeremiah Kamau.
面頁冊數:	120 p.
附註:	Source: Dissertation Abstracts International, Volume: 64-01, Section: B, page: 0234.
Contained By:	Dissertation Abstracts International64-01B.
標題:	Chemistry, Polymer. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3078047
ISBN:	0493987649

Self-assembled thin films of semiconducting zinc (II) and terbium (III) chelates for optoelectronics applications.
Mwaura, Jeremiah Kamau.

Self-assembled thin films of semiconducting zinc (II) and terbium (III) chelates for optoelectronics applications. - 120 p.

Source: Dissertation Abstracts International, Volume: 64-01, Section: B, page: 0234.

Thesis (Ph.D.)--The University of Connecticut, 2003.

Metallorganic thin films with semi-conducting properties, based on zinc chelation with 8,8<super>′</super>-dihydroxy-5,5<super>′</super>-bisquinoline were fabricated via a reactive self-assembly technique. An accelerated film growth was observed with assemblies done using organo-zinc (ZnEt 2, Zn(CH3COO)2, and Zn(CF3COO) 2) salts, compared to a slower growth with ZnCl2, and ZnBr 2. The film growth properties were characterized through various spectroscopic and microscopy techniques. The accelerated growth observed is presently explained via a secondary self-assembly process of labile zinc-precursors stabilized within cavities formed in the primary structure. Light emitting diodes were fabricated from the zinc chelates, which presently exhibit limited quantum efficiencies. A metal-chelating polyurethane-urea based on 2,6-diaminopyridine and 1,6-diisocyanato hexane and chain extended with polyethylene oxide was assembled with a terbium salt to produce luminescent multilayer chelate films, via a novel anhydrous layer-by-layer self-assembly process.

ISBN: 0493987649Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Self-assembled thin films of semiconducting zinc (II) and terbium (III) chelates for optoelectronics applications.
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245 1 0 $a Self-assembled thin films of semiconducting zinc (II) and terbium (III) chelates for optoelectronics applications.
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500 $a Source: Dissertation Abstracts International, Volume: 64-01, Section: B, page: 0234.
500 $a Adviser: Fotios Papadimitrakopoulos.
502 $a Thesis (Ph.D.)--The University of Connecticut, 2003.
520 $a Metallorganic thin films with semi-conducting properties, based on zinc chelation with 8,8<super>′</super>-dihydroxy-5,5<super>′</super>-bisquinoline were fabricated via a reactive self-assembly technique. An accelerated film growth was observed with assemblies done using organo-zinc (ZnEt 2, Zn(CH3COO)2, and Zn(CF3COO) 2) salts, compared to a slower growth with ZnCl2, and ZnBr 2. The film growth properties were characterized through various spectroscopic and microscopy techniques. The accelerated growth observed is presently explained via a secondary self-assembly process of labile zinc-precursors stabilized within cavities formed in the primary structure. Light emitting diodes were fabricated from the zinc chelates, which presently exhibit limited quantum efficiencies. A metal-chelating polyurethane-urea based on 2,6-diaminopyridine and 1,6-diisocyanato hexane and chain extended with polyethylene oxide was assembled with a terbium salt to produce luminescent multilayer chelate films, via a novel anhydrous layer-by-layer self-assembly process.
520 $a UV-Vis spectroscopy and spectroscopic ellipsometry indicate a monotonic but complex increase in film thickness relative to the number of layers. These assemblies show a strong green emission, characteristic of luminescent terbium (Tb<super>3+</super>) chelates. Light emitting diodes from a terbium chelating fully conjugated polyurea, poly(1,4-phenylene-2,6-pyridylurea) were fabricated and electrical properties characterized. The photo-physical properties of these metal chelating pyridyl-based aromatic were also investigated. In their solution state and upon prolonged exposure to 365 nm UV-radiation, these low and high molecular weight compounds were found to cleave the urea linkage nearly quantitatively, generating corresponding amine terminated subunits and CO2 NMR, UV/Vis absorption and fluorescence spectroscopy characterization of the photo-cleavage processes were delineated as a function of UV dose, O2 and water. Experimental results support a light-assisted hydrolysis of the urea bond as the most plausible photo-cleavage mechanism.
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