PROCEEDINGS OF THE INTERNATIONAL CONFERENCE NANOMATERIALS: APPLICATIONS AND PROPERTIES Vol. 1 No 3, 03TF07(3pp) (2012) 2304-1862/2012/1(3)03TF07(3) 03TF07-1 2012 Sumy State University Properties of Langmuir-Blodgett Films Based on Organosoluble Polyelectrolyte-Surfactant Complex and Oxazine Dye E.V. Seliverstova 1,* , N.Kh. Ibrayev 1,† , S.E. Kudaibergenov 2,3,‡ 1 E.A. Buketov Karaganda State University, 28, University Str., 100028 Karaganda, Kazakhstan 2 Laboratory of Engineering Profile, K.I. Satpaev Kazakh National Technical University, 22, Satpaev Str., 050013 Almaty, Kazakhstan 3 Institute of Polymer Materials and Technology, 52/105, Panfilov Str., 050013 Almaty, Kazakhstan (Received 5 June 2012; published online 18 August 2012) Preparation procedure of organosoluble stoichiometric polycomplex based on cationic polyelectrolyte and anionic surfactant has been described. It was shown the formation of mixed monolayers consisting of polyelectrolyte-surfactant complex and dye molecules at the water-air interface. Assembling conditions of fluorescent nanosized solid Langmuir-Blodgett films based on polycomplex and dye Nile Red were defined and the spectral-luminescent properties of obtained films were studied. Absorption and fluorescence spec- tra of mixed Langmuir-Blodgett films revealed that electrostatic interaction between polycomplex and dye molecules is responsible for formation of dimers. Keywords: Langmuir-Blodgett films, Optical properties, Polyelectrolyte, Oxazine dye. PACS numbers: 82.35.Rs, 68.18.Jk * Genia_sv@mail.ru † niazibraev@mail.ru ‡ ipmt-kau@usa.net 1. INTRODUCTION Polyelectrolyte-surfactant complexes are a new class of materials that possess supramolecular structure at the molecular level. Preparation, conformational and physical- chemical properties of polyelectrolyte-surfactant complex- es have been reviewed in [1, 2]. Recently organosoluble stoichiometric polyelectrolyte-surfactant complexes at- tracted much attention of researchers [3-5]. The unique property of dye Nile Red is that it is widely used as an active material for light-emitting diodes and lasers [6, 7], in solar energy concentrators [8], sensor of the medium polarity [9, 10]. The Langmuir-Blodgett (LB) technique is one of the ef- fective tools to design functional nanomaterials. In partic- ular, the typical LB compatible materials are amphiphilic molecules or mixture of non-amphiphilic molecules with fatty acids because behavior of non-amphiphilic molecules in LB films is similar to their amphiphilic precursors [11, 12]. This fact encourages studying of mixed LB films, inasmuch as such films can easily be prepared from exist- ing non-amphiphilic molecules without chemical synthesis of amphiphilic luminophores [11-14]. Assembling of nanostructured LB films with the help of electrostatic interactions has advantages over a time- consuming and expensive chemical synthesis. The struc- ture of resulting systems is reversible and stimuli- responsive to the environment change (e.g., solvent quali- ty, concentration of components, pH, temperature, etc.) [15-17]. Nanostructured materials obtained by using of different principles of self-organization and molecular recognition serve as a basis for the development of tunable nanoporous materials with anisotropic properties, such as proton conductivity [18-20]. However, in spite of a great number of publications devoted to study of adsorbed films and Langmuir monolayers [21, 22] information on fluores- cent thin solid films assembled with participation of poly- electrolyte-surfactant polycomplexes and dyes to our best knowledge is lacking. The main aim of the present paper is to study the fluo- rescencing behavior of nanosized Langmuir-Blodgett films based on polyelectrolyte-surfactant complex and dye Nile Red. 2. EXPERIMENTAL Stoichiometric polyelectolyte-surfactant polycomplex was derived from cationic polyelectrolyte – poly(N- vinylbenzyl-N,N,N-trimethylammonium chloride (PVBTMAC) with molecular weight М 2.47·10 4 and anionic surfactant – sodium salt of dodecylbenzenesul- fonate (DBSS). PVBTMAC and DBSS were purchased from Polysciences Inc. (USA) and used without additional purification. Dye Nile Red was purchased from Organic Intermediates and Dyes Institute (Russia). Structural formulas of used compounds are shown in Fig. 1. Fig. 1 – Structural formulas of (a) PBTMAC, (b) DBSS and (c) Nile Red. Polycomplex PVBTMAC-DBSS was prepared as fol- lows: 10 mL aqueous solution of PVBTMAC with concen- tration С 10 -3 mol/L was preliminarily titrated by aque- brought to you by CORE View metadata, citation and similar papers at core.ac.uk provided by Electronic Sumy State University Institutional Repository