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Influence of LCVD technological parameters on properties of polyazomethine thin films

Hajduk B., Weszka J., Jurusik J.

Journal of Achievements in Materials and Manufacturing Engineering

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2009

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Vol. 36, nr 1

41-48

EN

Purpose: The aim of this paper is to show influence of technological parameters (temperature and gas stream intensity) of low-temperature chemical vapour deposition (LCVD) on optical properties and morphology of polyazomethine thin films. Design/methodology/approach: Thin layers of poly (1,4-phenylene-methylenenitrilo-1,4-phenylenenitrilo-methylene) (PPI) were prepared by low temperature LCVD method with use of argon as a transport agent. The UV-Vis spectroscopy and AFM microscopy measurements on PPI thin films were performed. Findings: The LCVD parameters, like temperature and argon stream intensity, influence growth rate, morphology and optical properties of polyazomethine thin films. Optimalization of technical parameters allows for thin films with desired properties to be prepared. Research limitations/implications: Optimalization of technical LCVD parameters leads to preparing PPI thin films having desired morphology and optical properties suitable for optoelectronic applications. Practical implications: PPI polyazomethine is good material for potential applications as the active layer in optoelectronic or photonic structure (diods or photovoltaic cells). Originality/value: LCVD with use of argon is relatively new method for preparing of thin polymer films. Recognizing of optimal technical parameters will make possible getting of thin films with required properties.

2

Fluorescence Analysis as an Effective Method Used in Micro/Trace Explosive Detection

Liu Y., Shu Y., Liu Xue-yong., Xiong Y., Zhong Fa-chun., Sun Y.

Central European Journal of Energetic Materials

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2009

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Vol. 6, nr 3-4

303-311

EN

There are many kinds of explosives, and their detection methods vary. Nitroaromatic compound is one of the composition of the explosives commonly used. The fuorescence will be quenched when they touch the fuorescent conjugated polymers. General methods for explosives detection have been summarized in this paper, in addition the application of novel fuorescence analysis technique in explosives detection has been introduced. Fluorescent conjugated polymer as chemical sensing material for explosive detection has been reviewed in detail, also a novel fuorescent sensing flm self-assembled by fuorescent small molecule pyrene and homogeneous fuoroimmunoassay have been presented briefy. The development of fuorescence analysis used in the area of determining explosives has been prospected.

3

Optical properties of polyazomethine with oxygen atom in the backbone

Hajduk B., Weszka J., Cozan V., Kaczmarczyk B., Jarząbek B., Domański M.

Archives of Materials Science and Engineering

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2008

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Vol. 32, nr 2

85-88

EN

Purpose: The aim of this paper is to show results of optical measurement performed on poly - (1-(4-methylenephenoxy-1)phenylene-4-methylene-1.4-phenylnenitrylomethylene) (PPI2) polyazomethine thin films and to compare with poly - (1.4-phenylenemethylenenitrilo-1.4 phenylenenitrilomethylene) (PPI). Design/methodology/approach: Influence of oxygen atom in the polymer chain on optical properties of polyazomethine was investigated. Optical UV-VIS and FTIR absorption spectra of polyazomethine PPI2 with oxygen atom were recorded and X-ray patterns of these polymers were performed. Findings: The oxygen atom incorporated in ordered way into PPI2 chain breaks conjugation and cause increase of energy gap in polymer. Research limitations/implications: The oxygen atom incorporated between phenylene rings of dialdehyde changes PPI chain into sequence of alternative three ring conjugated fragments and oxygen atoms. Practical implications: Addition of oxygen atom inside aldehyde fragment in polyazomethine chain influences conformation of polymer. The prepared layers of polyazomethine with oxygen atom in the backbone are expected to be more amorphous and more luminescent properties. Originality/value: Polyazomethine is very interesting material as it has nitrogen atom in the backbone, and is isoelectronic counterpart of polyparaphenylenevinylene (PPV). This paper shows that addition of oxygen atom into polyazomethine chain influences its optical properties.

4

Investigation of charge carrier features in polymers by CELIV method

Juška G., Arlauskas K., Österbacka R., Stubb H.

Prace Naukowe Instytutu Podstaw Elektrotechniki i Elektrotechnologii Politechniki Wrocławskiej. Konferencje

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2004

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Vol. 40, nr 15

4-8

EN

We show possibilities and results on charge carrier transport measurements in π-conjugated polymers using novel charge carrier extraction current techniques. We show how to estimate charge carrier mobility and density of equilibrium, photogenerated and injected charge carriers using carrier extraction in a linearly increasing voltage techniques. We have applied the techniques to a wide variety of π-conjugated polymers.