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    Structure of CdS-arachidic acid composite LB multilayers

    Year: 2002

    Journal: Colloids and Surfaces, A: Physicochemical and Engineering Aspects 198-200 (2002) 59-66, 20111221

    Authors: 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 400076, India b Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology, Bombay, Mumbai 400076, India c Department of Chemistry, Indian Institute of Technology, Bombay 400076, Mumbai, India d Sincrtrone Trieste, Basovizza, Italy

    Langmuir-Blodgett (LB) multilayers of cadmium arachidate were used as precursors to grow semiconducting CdS nanoclusters. The formation of CdS in the multilayers was determined by Fourier transform-infrared (FT-IR), ultraviolet-visible (UV-vis) and Raman spectroscopy. The structural changes occurring as a consequence of CdS formation have been characterized using X-ray reflection (XR) and grazing incidence X-ray diffraction (GIXD) techniques. The CdS containing composite multilayers exhibit the presence of two types of molecular domains, one with close packed herringbone arrangement and the other with tilted molecular chains with no in plane order. The structural and spectroscopic evidences together suggest that the CdS nanoclusters formed within the arachidic acid LB matrix are quasi two-dimensional in nature with lateral dimension ~5-10 nm and thickness ~1.1 nm.