Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
Stabilization of langmuir and langmuir blodgett cetyltrimethylammonium bromide monolayers by gluing with polystyrene sulfonate
Download
index.pdf
Date
2015
Author
Utku, Nezaket Nehir
Metadata
Show full item record
Item Usage Stats
95
views
15
downloads
Cite This
Organic thin films have wide range application areas such as biosensors, permeation selective barriers, molecular electronics, optical devices and coatings. The properties of such films can be tuned by their composition, structure and uniformity. Stability of obtained films has also an important factor in the fabrication and the transfer of the films. For this aim, Langmuir is an elegant technique for both the production and deposition of monolayers onto a solid support. Herein, some optimization studies such as subphase temperature, pH, compression rate and transfer rate were performed with stearic acid (SA) and octadecane-1-thiol (ODT) which are the standard materials of Langmuir system. Concentration and subphase temperature were also optimized for cetyltrimethylammonium bromide (CTAB) which was used to prepare and organize the gold nanorods (GNRs) in a monolayer structure. Lately, it was reported that some water soluble materials can also form Langmuir monolayers but to produce a Langmuir compatible complex, an interaction with these water soluble materials with a water insoluble material is needed. However, CTAB was used by itself without any complex forming reagent and stable monolayers were obtained. Polymers, particularly water soluble ones, are used as a glue to improve the cohesiveness of LB films. This process is known as “gluing” where LB assemblies were cross-linked noncovalently through ionic and hydrophobic association with a water-soluble polymers. The effect of gluing on stability of CTAB monolayers was investigated. Poly(4- styrenesulfonate) (PSS) was used as a gluing agent. The addition of polymers into subphase led to an interaction between surfactant and polyelectrolyte and an increase in monolayer stability. In order to compare the effect of PSS on stability of the obtained monolayers, hysteresis loops (repeatedly compression-expansion cycles) were performed in the presence and absence of PSS in the subphase and it was concluded that more stabilized CTAB monolayers can be obtained by gluing. Moreover, glued CTAB multilayers can be prepared by Langmuir Blodgett technique. GNRs were synthesized by seed mediated growth approach. The aspect ratio of the rods were approximately 2.5. The characterization of GNRs was performed by UV spectrometry. Two characteristic rod plasmon absorptions were observed at 520 and 675 nm. The morphology of the GNRs was characterized by Scanning Electron Microscopy (SEM). After the deposition of negatively charged PSS glued CTAB monolayers, they were used for assembling the cationic gold nanorods on the surface of the substrate. Finally, the performance of the obtained structures as Surface Enhanced Raman Scattering (SERS) substrates were investigated utilizing brilliant cresyl blue (BCB) dye as a model compound.
Subject Keywords
Gluing.
,
Bromides.
,
Polystyrene.
,
Sulfonates.
,
Thin films, Multilayered.
URI
http://etd.lib.metu.edu.tr/upload/12618460/index.pdf
https://hdl.handle.net/11511/24425
Collections
Graduate School of Natural and Applied Sciences, Thesis
Suggestions
OpenMETU
Core
Investigation of material properties of magnetron sputtered CuAg-In-Se thin films
Güllü, Hasan Hüseyin; Parlak, Mehmet (null; 2016-09-23)
Thin films of copper based chalcopyrite absorber materials are attracting the attention of many researchers because of their favorable optoelectronic properties and good stability makes them suitable for photovoltaic and optoelectronic device applications. These compounds are particularly suitable for making p-n hetero-junctions with the II-VI compounds. Therefore, the utilization of I-III-VI2 group of chalcopyrite semiconductors has been reported in the literature for application in thin film solar cells. ...
Development of indium tin oxide (ITO) nanoparticle incorporated transparent conductive oxide thin films
Yavaş, Hakan; Durucan, Caner; Department of Metallurgical and Materials Engineering (2012)
Indium tin oxide (ITO) thin films have been used as transparent electrodes in many technological applications such as display panels, solar cells, touch screens and electrochromic devices. Commercial grade ITO thin films are usually deposited by sputtering. Solution-based coating methods, such as sol-gel however, can be simple and economic alternative method for obtaining oxide films and also ITO. In this thesis, “ITO sols” and “ITO nanoparticle-incorporated hybrid ITO coating sols” were prepared using indi...
Temperature-dependent thermoelastic properties of GaSb and InSb semiconductors: Identification through ab initio DFT simulations
Baloğlu, Eyüp Can; Toffoli, Hande; Dal, Hüsnü (2022-10-15)
© 2022 Elsevier B.V.III–V semiconductors are extensively used in infrared sensor applications due to their superior structural and optical properties. Due to the extremes in the manufacturing and operating temperatures of the sensors, the knowledge of temperature-dependent elastic constants of these materials is of great importance. However, reliable measurements across a large range of temperatures prove difficult due to limitations of experimental setups. Density functional theory calculations present an ...
Effect of crystallization on the electronic and optical properties of archetypical porphyrins
Malcıoğlu, Osman Barış; Bockstedte, Michel (Royal Society of Chemistry (RSC), 2020-02-21)
Thin porphyrin films as employed in modern optical devices or photovoltaic applications show deviating electronic and optical properties from the gasphase species. Any understanding of the physical origin may pave way to a specific engineering of these properties via ligand or substituent control. Here we investigate the impact of crystallization of prototypical porphyrins on the electronic levels and optical properties in the framework of density functional theory and many-body perturbation theory. Crystal...
All Solution-Based Fabrication of Copper Oxide Thin Film/Cobalt-Doped Zinc Oxide Nanowire Heterojunctions
AKSOY, FUNDA; AKGÜL, GÜVENÇ; Turan, Raşit; Ünalan, Hüsnü Emrah (2016-07-01)
Versatile and intriguing solution-based processes are utilized to synthesize nanostructured materials for device applications to reduce material production and device fabrication costs. This study presents results on the fabrication and characterization of copper oxide ( CuO) coated cobalt-doped zinc oxide nanowires ( Co-doped ZnO NWs)-based heterojunction diodes prepared by a two-step synthesis route through combined hydrothermal growth and sol-gel spin coating. Highly dense, well-ordered, undoped, and Co-...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
N. N. Utku, “Stabilization of langmuir and langmuir blodgett cetyltrimethylammonium bromide monolayers by gluing with polystyrene sulfonate,” M.S. - Master of Science, Middle East Technical University, 2015.