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Surface morphology of thin films polyoxadiazoles

Weszka J., Szindler M.M., Chwastek-Ogierman M., Bruma M., Jarka P., Tomiczek B.

Journal of Achievements in Materials and Manufacturing Engineering

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2011

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Vol. 49, nr 2

224--232

EN

Purpose: The purpose of this paper was to analyse the surface morphology of thin films polyoxadiazoles. Design/methodology/approach: SSix different polymers which belong to the group of polyoxadiazoles were dissolved in the solvent NMP. Each of these polymer was deposited on a glass substrate and a spin coating method was applied with a spin speed of 1000, 2000 and 3000 rev/min. Changes in surface topography and roughness were observed. An atomic force microscope AFM Park System has been used. Photos have been taken in noncontact mode while observing an area of 10 x 10 microns. Findings: The analysis of images has confirmed that the quality of thin films depends upon the used polymers. It was also observed that the parameters of the spin coating method have significant effect on the morphology and the surface roughness. The speed of the spin has got a strong impact on the topography of the thin films obtained. Research limitations/implications: The morphology of polyoxadiazoles thin films has been described. This paper include description how the spin speed influences the morphology of polymer thin films. In order to use a polymer thin film in photovoltaics or optoelectronics it must have a uniform thickness and a low surface roughness. Further research, in which the optical properties of thin films are investigated, is strongly recommended. Practical implications: Conductive polymers may find applications in photovoltaics or optoelectronics. It is important to study this group of material engineering and to find a new use for them. Materials from which thin films are made of will have an impact on the properties and characteristics of electronics devices in which they are be applied. Originality/value: The value of this paper is defining the optimal parameters of spin-coating technology for six polyoxadiazoles. The results allow the choosing optimal parameters of the deposition process. Spin coating is a very good method to obtain thin films which are obligated to heve the same thickness over the whole surface.

2

Comparing of optical properties and morphology of polyoxadiazoles with CF3 groups

Hajduk B., Jarka P., Weszka J., Bruma M., Jurusik J., Chwastek M., Mańskowski D.

Journal of Achievements in Materials and Manufacturing Engineering

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2010

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Vol. 40, nr 1

7-14

EN

Purpose: The aim of this paper is to compare optical properties of 4-(1,1,1,3,3,3-hexafluoro-2(-4(-3(4-(5-(4-m-tolyoxy)phenyl)-1,3,4-oxadiazol-2-yl)phenoxy)phenylcarbomyl)phenyl)propan2-yl)-N-methylbenzamide (Oxad 6F-D) and 4-(1,1,1,3,3,3-hexafluoro-2(-4-(4-(4-(5-(4-(p-tolyoxy)phenyl)-1,3,4-oxadiazol-2-yl)phenoxycarbaomyl)phenyl)propan-2-yl)-N-methylbenzamide (Oxad 6F-E). Design/methodology/approach: The Oxad 6F polymer thin films were deposited onto glass and KBr substrates by spin–coating method under different technological conditions. Findings: The spinning rate V and solution concentration C influenced optical properties of Oxad 6F-D and Oxad 6F-E thin films. The goal of this paper is to show differences in properties of these polymers. Research limitations/implications: The electrical and luminescent properties of Oxad 6F polymers will be carried out in the nearest time. The different properties of these polymers are caused by benzene position in the polymer chain, two aromatic rings are in meta-position in Oxad 6F-D and all benzene rings are in para-positions in Oxad 6F-E. Practical implications: Thin films of Oxad 6F-D and Oxad 6F-E are good potential material for applications in polymer optoelectronic devices. Originality/value: The aim of this paper is to describe the optical properties of Oxad 6F polymers prepared under different technological conditions.

3

Studying of polyoxadiazole with Si atom in the backbone

Hajduk B., Jarka P., Weszka J., Bruma M., Jurusik J., Chwastek M., Mańkowski D.

Archives of Materials Science and Engineering

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2010

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Vol. 42, nr 2

77-84

EN

Purpose: The aim of this paper is to show properties of spin-coated thin films of new polymer having silicon atom in the backbone. This amorphous polymer has appeared to be applied as active films in organic devices (as OLED). Design/methodology/approach: Thin films of 4-(diphenyl(4-(4-(5-(p-tolyoxy)phenyl)-1,3,4-oxadiazol-2-yl)phenyloamino)methyl)-phenyl)silyl)-1-methylbenzamide (Oxad–Si-B) were obtained by spin-coating method. The methodology of preparing was changing of technological parameters such as solution concentration and spinning rate V. The films were deposited with five spinning rates. Findings: Such technological parameters as spinning rate and solution concentration has appeared to influence optical properties of thin films. These parameters were found to influence surface morphology and UV-Vis absorption spectra of thin films. Research limitations/implications: The optical properties of obtained films will allow further researches of this polymer. Its optical properties allow carrying of electrical measurements, which will be carried out in the nearest time. Practical implications: The value of Oxad-Si (B) energy gap suggests its luminescent properties and applications of this material as active film in optoelectronic devices. Originality/value: The goal of this paper is to show optical properties of thin films prepared with most optimal technology conditions.

4

Electric and dielectric features of thin organic polymer layers

Lozovski T., Montrimas E., Arlauskas K.

Prace Naukowe Instytutu Podstaw Elektrotechniki i Elektrotechnologii Politechniki Wrocławskiej. Konferencje

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2004

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Vol. 40, nr 15

1-3

EN

The charge carrier transport features of organic dielectric layers on the base of double hydrazone derivative and polycarbonate (PC) mixture of ratio 1:1 by weight have been investigated. The dielectric layers have been cast from solution of both organic materials on thin poly(ethylene theraphthalate) films coated by aluminum layer. Using dosed charging-discharging method, by measuring charge-voltage (C-V) characteristics, the dielectric features of organic polymer layers have been investigated. Latter characteristics enabled to evaluate layer's dielectric permittivity, surface resistance and it's dependence on electric field and polarity of charging potential. Investigation of the hole drift mobility dependencies on electric field by time-of-flight method demonstrated that the hole mobility increased from 3.5∙10-7 cm2/Vs till 2∙10-6cm2/Vs with the electric field increasing from 1.6∙105 V/cm up to 6∙105 V/cm.