In order to study their electrochemical and optical properties, two donor-acceptordonor
(D-A-D) type monomers / 4' / -(tert-butyl)-4,7-bis(4-hexylthiophen-2-
yl)spiro[benzo[d]imidazole-2,1' / -cyclohexane] (BIHT) and 4' / -(tert-butyl)-4,7-bis(2,3-
dihydrothieno[3,4-b][1,4]dioxin-5-yl)spiro[benzo[d]imidazole-2,1' / -cyclohexane]
(BIED), were electrochemically polymerized. These properties were investigated by
cyclic voltammetry and UV&ndash / Vis-NIR Spectroscopy techniques. Effects of different
donor groups / 3-hexylthiophene and 3, 4-ethylenedioxythiophene (EDOT), on new
benzimidazole group, 4' / -(tert-butyl)spiro[benzo[d]imidazole-2,1' / -cyclohexane], were
investigated. These pendant groups cause slight differences in optical band gaps,
which are 1.19 eV for PBIHT, 1.15eV for PBIED. PBIHT and PBIED have both nand
p- doping. Both of them have broad absorption in the visible region. In NIR
region, both polymers revealed 46 % transmittance with high switching times.
PBIED and PBIHT showed multichromic properties. PBIED is green at neutral state.
For the most oxidized and reduced states, it is blue and red, respectively. PBIHT is
blue at neutral state, transmissive-gray in oxidized state and transmissive greenishgray
in reduced state.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12615196/index.pdf |
| Date | 01 November 2012 |
| Creators | Ozelcaglayan, Ali Can |
| Contributors | Toppare, Levent |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for METU campus |
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