dc.contributor.advisor | Dağ, Ömer | |
dc.contributor.author | Akdoğan, Yaşar | |
dc.date.accessioned | 2016-07-01T11:05:03Z | |
dc.date.available | 2016-07-01T11:05:03Z | |
dc.date.issued | 2006 | |
dc.identifier.uri | http://hdl.handle.net/11693/29784 | |
dc.description | Cataloged from PDF version of article. | en_US |
dc.description.abstract | Mesostructured silica can be used as a reaction medium to produce solidsolution
of Cd1-xZnxS nanocrystals as thin films. These films were synthesized from
oligo(ethylene oxide) non-ionic surfactant (CH3(CH2)11(OCH2CH2)10OH, (C12EO10)),
cadmium and zinc nitrate salts ([Cd(H2O)4](NO3)2 and [Zn(H2O)6](NO3)2), water,
and tetramethylorthosilicate (TMOS, as silica source) mixtures using a liquid
crystalline templating (LCT) approach and metal containing liquid crystalline (MLC)
mesophase. Metal ion to surfactant mole ratio was 1.0 which determines the stability
and structure of the mesostructured silica. The mesostructured silica film has a 3D
hexagonal structure with oriented channels. The silica pore size can be controlled by
controlling ageing temperature and time. The pore diameter of the silica channels that
aged at room temperature (RT) for two days is 4.7 nm and the one aged at 2500
C for
30 minutes is 3.3 nm.
Cd(II) and Zn(II) incorporated film samples can be reacted at RT under H2S
atmosphere to produce zinc blend, Cd1-xZnxS nanocrystals (nano-Cd1-xZnxS-meso-SiO2) in the channels of the mesostructured silica. The band gaps of the nano-Cd1-
xZnxS-meso-SiO2 vary between 2.6 eV for CdS and 4.1 eV for ZnS. The Cd (II) rich
nanoparticles are larger (4.4 nm) than Zn (II) rich nanoparticles (3.1 nm). The silica
wall thickness that can be controlled by ageing at different temperatures confines the
growth of the Cd1-xZnxS nanocrystals in the pores. By controlling the size of the silica
channel between 4.7 and 3.3 nm, one can control the band-gap of the CdS
nanocrystals between 2.6 and 2.8 eV. | en_US |
dc.description.statementofresponsibility | Akdoğan, Yaşar | en_US |
dc.format.extent | xvi, 76 leaves, illustrations, graphs | en_US |
dc.language.iso | English | en_US |
dc.rights | info:eu-repo/semantics/openAccess | en_US |
dc.subject | Mesostructured silica | en_US |
dc.subject | Non-ionic surfactant | en_US |
dc.subject | Mesopores | en_US |
dc.subject | Ageing | en_US |
dc.subject | Metal containing Liquid Crystals | en_US |
dc.subject | Solid solution of Cd1-xZnxS | en_US |
dc.subject | Nanoparticle | en_US |
dc.subject | Semiconductor | en_US |
dc.subject | Band-gap | en_US |
dc.subject.lcc | QD923 .A33 2006 | en_US |
dc.subject.lcsh | Liquid crystals. | en_US |
dc.title | Solid-solution of Cd(formula)Zn(formula)S nanocrystals in the channels of mesostructured silica films | en_US |
dc.type | Thesis | en_US |
dc.department | Department of Chemistry | en_US |
dc.publisher | Bilkent University | en_US |
dc.description.degree | M.S. | en_US |
dc.identifier.itemid | BILKUTUPB095634 | |