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    Relating structure with morphology: A comparative study of perfect Langmuir–Blodgett multilayers

    Year: 2008

    Journal: Chemical Physics Letters, Volume 451, Issues 1-3, 17 January 2008, Pages 80-87, 20111221

    Authors: Smita Mukherjee, Alokmay Datta, Angelo Giglia, Nichole Mahne and Stefano Nannarone

    Organizations: Surface Physics Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700 064, India, TASC-INFM National Laboratory, Area Science Park, Basovizza (Trieste), Italy, INFM and Dipartimento di Ingegneria dei Materiali ed Amb., Universit di Modena e Reggio Emilia, Italy

    Atomic force microscopy and X-ray reflectivity of metal-stearate (MSt) Langmuir–Blodgett films on hydrophilic Silicon (1 0 0), show dramatic reduction in ‘pinhole’ defects when metal M is changed from Cd to Co, along with excellent periodicity in multilayer, with hydrocarbon tails tilted 9.6° from vertical for CoSt (untilted for CdSt). Near edge X-ray absorption fine structure (NEXAFS) and Fourier transform infra-red (FTIR) spectroscopies indicate bidentate bridging metal-carboxylate coordination in CoSt (unidentate in CdSt), underscoring role of headgroup structure in determining morphology. FTIR studies also show increased packing density in CoSt, consistent with increased coverage.