Tuning the optoelectronic properties of conjugated polymers via donor-acceptor-donor architectures

Download

index.pdf

Date

2010

Author

Tarkuç, Simge

Metadata

Show full item record

Item Usage Stats

213
views

85
downloads

A new class of π-conjugated monomers was synthesized with combination of electron donating and electron-withdrawing heterocyclics to understand the effects of structural differences on electrochemical and optoelectronic properties of the resulting polymers. The use of this alternating donor-acceptor-donor strategy allows the synthesis of low band gap polymers in which the redox, electronic, and optical properties are controlled through easily approachable synthetic modification of the polymer backbone. This control allows fine-tuning of the band gap to values between 1.0 and 1.8 eV by making structural changes. These structural manipulations yield varied electronic absorption energies for a range of colors in the neutral polymer films, multi-colored electrochromism, and accessible states for reduction leading to n-type doping. The polymers prepared were characterized using cyclic voltammetry, colorimetry, and UV-Vis-NIR spectroscopy demonstrating that the polymers can undergo both p- and n-type doping and color changes in both redox states.

Subject Keywords

Chemistry., Electrochemical polymerization., Electrochromism., Polymers., Macromolecules.

URI

http://etd.lib.metu.edu.tr/upload/12612103/index.pdf
https://hdl.handle.net/11511/19723

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Tailoring the optoelectronic properties of donor-acceptor-donor type pi-conjugated polymers via incorporating different electron-acceptor moieties Tarkuc, Simge; Udum, Yasemin Arslan; Toppare, Levent Kamil (2012-01-31) Syntheses of donor-acceptor-donor type of pi-conjugated monomers were performed to examine the effect of the acceptor units' strength on the electrochemical and optoelectrochemical properties of the resulting monomer and polymer. Palladium catalyzed Stille cross-coupling reaction of an organotin reagent with an organic electrophile was used for the synthesis of target monomers, 5,8-bis(4-hexylthiophen-2-yl)-2-(2,3-dihydrobenzo[b][1,4]clioxin-6-y1)-3-(2,3-dihydrobenzo[b][1,41dioxin-7-yl)quinoxaline (DBQHT) a...
Benzyl functionalized benzotriazole containing conjugated polymers: effect of substituent position on electrochromic properties and synthesis of crown ether functionalized electrochromic polymers Yiğitsoy, Başak; Toppare, Levent Kamil; Department of Chemistry (2011) A new class of π-conjugated monomers was synthesized with combination of electron donating and electron-withdrawing heterocyclics to understand the effects of structural differences on electrochemical and optoelectronic properties of the resulting polymers. Electron deficient benzotriazole, substititued with benzyl from two available sites, coupled with stannylated electron donating groups, ethylenedioxythiophene (EDOT) and thiophene (Th), to yield four different monomers; 1-benzyl-4,7-di(thiophen-2-yl))-2H...
Syntheses of benzotriazole bearing donor acceptor type random copolymers for full visible light absorption Öktem, Gözde; Toppare, Levent Kamil; Department of Chemistry (2011) The synthesis and preliminary optoelectronic properties of a series of donor-acceptor (DA) type polymers differing by the acceptor units in the polymer backbone were investigated. Polymers CoP1, CoP2 and CoP3 were designed to yield alternating DA segments with randomly distributed different acceptor units along polymer backbone. The combination of neutral state red colored and neutral state green colored materials resulted in different neutral state colors with respect to their additional acceptor unit. 5,8...
Spray processable ambipolar benzotriazole bearing electrochromic polymers with multi-colored and transmissive states Hızalan, Gönül; Toppare, Levent Kamil; Department of Chemistry (2011) The interest towards organic semi-conductors increased due to their tunable band gaps, redox properties, processability and low cost in the field of conducting polymers. Electrochromic materials have the ability to change color by altering their redox state. In the context of low cost flexible display device technology, requirements can be fulfilled with accessible multi-colored electrochromic polymers. In this study, we report the chemical synthesis and electrochromic properties of two spray processable, a...
Design of Carbon Nanotube Modified Conducting Polymer for Biosensing Applications Ozdemir, Caglar; Tuncagil, Sevinc; ODACI DEMİRKOL, DİLEK; TİMUR, SUNA; Toppare, Levent Kamil (2011-01-01) An electrochemical biosensor with improved performance was designed through the immobilization of glucose oxidase (GOx) onto conducting polymer of 4-(2,5-di(thiophen-2-yl)-1H-pyrrol-1-yl)benzenamine (SNS-NH2) modified with carbon nanotubes (CNTs). For the optimization and characterization of the biosensor, pH profile, enzyme loading, reproducibility, operational stability experiments were carried out. It was found that the use of CNTs in a biosensing system enhanced the biosensor response. The linear relati...

Citation Formats

S. Tarkuç, “Tuning the optoelectronic properties of conjugated polymers via donor-acceptor-donor architectures,” Ph.D. - Doctoral Program, Middle East Technical University, 2010.