Nanoparticle Organization at the Air‐Water Interface and in Langmuir‐Blodgett Films

Synthesis of Aqueous Au Core−Ag Shell Nanoparticles Using Tyrosine as a pH-Dependent Reducing Agent and Assembling Phase-Transferred Silver Nanoparticles at the Air−Water Interface

“…Highly monodisperse nanoparticles synthesized in nonpolar organic solvents have been shown to self-assemble into ordered structures during solvent evaporation on suitable substrates. , However, these nanoparticle assemblies generally lack long-range order and good reproducibility. Other methods for nanoparticle assembly rely on immobilizing them on the surface of self-assembled monolayers 21a, or surface-modified polymers 21a, by covalent attachment, electrophoretic assembly onto suitable substrates, , or immobilizing nanoparticles at the air−water interface by using electrostatic interactions between nanoparticles and oppositely charged Langmuir monolayers. 21a, Slightly different approaches involve the spontaneous growth of thin films of nanoparticles at the air−organic solvent interface and the diffusion of charged nanoparticles into thin, ionizable fatty lipid films. 21a,26a Insofar as using the air−water interface for nanoparticle assembly is concerned, perhaps the oldest variant was based on the assembly of hydrophobic (water-insoluble) nanoparticles and formation of Langmuir−Blodgett (LB) films thereafter. This was demonstrated for the first time by Fendler and co-workers wherein compact, ordered arrays of monolayer protected clusters (MPCs) of different chemical compositions were formed by spreading the nanoparticle organic solution at air−water interface and then transferring the nanoparticle monolayers onto suitable substrates using the LB technique .…”

One-Step Synthesis of Ordered Two-Dimensional Assemblies of Silver Nanoparticles by the Spontaneous Reduction of Silver Ions by Pentadecylphenol Langmuir Monolayers

“…However, assembling 2D arrays of nanoparticles by the drop-coating method suffers from a number of drawbacks such as formation of multilayers or gaps in the monolayers due to uncontrolled solvent evaporation. Another popular approach that often leads to much more compact mono-/multilayers of nanoparticles is based on the Langmuir−Blodgett (LB) technique wherein hydrophobic, organically dispersible nanoparticles are first synthesized, purified, rendered more monodisperse by size-selective separation, and then finally organized at the air−water interface …”

Tunable Electrical Transport through Annealed Monolayers of Monodisperse Cobalt−Platinum Nanoparticles

“…The collective properties of assemblies of nanoparticles interacting with each other can differ from the behavior of individual particles, with amazing application potential, for example, in optical and electronic devices. 6 The transport properties and mechanisms of 2D metallic nanoparticle arrays are discussed for instance, by the Jaeger group. 7Ϫ9 In previous publications we reported about highly ordered, monolayered cobaltϪplatinum nanoparticle films and their electrical properties.…”

“…An important step for further commercial exploitation of nanoparticles is their assembly into topologically predefined superstructures and their packing. The collective properties of assemblies of nanoparticles interacting with each other can differ from the behavior of individual particles, with amazing application potential, for example, in optical and electronic devices . The transport properties and mechanisms of 2D metallic nanoparticle arrays are discussed for instance, by the Jaeger group. − …”