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    Templating CdSe tetrapods at the air/water interface with POPC lipids

    Year: 2012

    Journal: Journal of Colloid and Interface Science, 2012, 378 (1), 58-63, 20131009

    Authors: Kung-Po Chao, Hitesh Bagaria, Michael S. Wong, Sibani L. Biswal

    Organizations: Department of Chemical and Biomolecular Engineering, Rice University, Houston, TX 77005, USA; Department of Chemistry, Rice University, Houston, TX 77005, USA

    Surfactants have been widely used as templating agents to pattern the orientation of nanoparticles of various conformations. Here we report the use of a lipid, 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC), as a template to order CdSe tetrapods (TPs) at the air/water interface using a Langmuir–Blodgett trough. The surface pressure versus area isotherms for CdSe TPs and CdSe TPs/POPC are examined and monitored by Brewster angle microscopy (BAM). The transferred thin films are further characterized by transmission electron microscopy (TEM) and atomic force microscopy (AFM). Initially disc-like structures containing randomly oriented TPs form during solvent evaporation. Upon decreasing surface area, these discs merge into larger continental structures. In a mixed CdSe TPs/POPC system, these discs organize into wire-like networks upon compression. We detail how lipid molecules can be used to direct the two-dimensional assembly of TPs.