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    Molecular packing in CdS containing conducting polymer composite LB multilayers

    Year: 2002

    Journal: Colloids and Surfaces, A: Physicochemical and Engineering Aspects 198-200 (2002) 67-74, 20111221

    Authors: V. Vidya , N. Prasanth Kumar , S.N. Narang , S. Major , Satish Vitta , S.S. Talwar , P. Dubcek , H. Amenitsch S. Bernstorff

    Organizations: a Department of Physics, Indian Institute of Technology Bombay, Mumbai 400 076, India b Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, Mumbai 400 076, India c Department of Chemistry, Indian Institute of Technology Bombay, Mumbai 400 076, India d Sincrotrone Trieste, 34012 Basovizza (TS ), Italy

    Langmuir-Blodgett (LB) technique has been used to deposit composite multilayers of poly (3-octylthiophene)-cadmium arachidate (POT-CdA) and polyaniline-cadmium arachidate (PANI-CdA). These were used as precursors to develop semiconducting CdS nanoclusters within the conducting polymer based multilayers. The presence of CdS in the multilayers was determined by Fourier transform infrared spectroscopy (FTIR), UV-Vis and Raman spectroscopy. The structural changes occurring as a consequence of CdS formation have been characterized using X-ray reflection and grazing incidence X-ray diffraction (GIXD) techniques. As-deposited POT-CdA multilayers exhibit good vertical as well as in-plane structure similar to that of CdA. In contrast, PANI-CdA multilayers have poor structural order. The in-plane molecular packing in CdA and PANI-CdA multilayers after H2S exposure has mixed domains of rectangular (herringbone) and hexagonal arrangements. In the case of POT-CdA multilayers, however, the original rectangular packing is retained.