Fabrication of 2D Gold Nanowires by Self-Assembly of Gold Nanoparticles on Water Surfaces in the Presence of Surfactants

Infrared external reflection spectra of Janus gold nanoparticle monolayers prepared at the air–water interface

“…Gold nanoparticle (AuNP) monolayers at the air-water interface have recently attracted widespread attention because of their tunable lateral surface density and ability to form 3D assemblies via the Langmuir-Blodgett method [4][5][6][7][8][9][10][11][12][13][14][15][16][17]. Moreover, NP monolayers can easily form anisotropic structures at the air-water interface because they are vertically confined.…”

Hierarchical Self‐Organization of Nanomaterials into Two‐Dimensional Arrays Using Functional Polymer Scaffold

“…The experiments using AuNPs capped with dodecanethiol and mercaptoundecanol showed no interference in the self-organization process (see Supporting Information S3). Although, there was a reduction in the surface hydrophobicity [28] of the nanoparticle, well-distributed nanoparticles within the walls of the microstructured film were observed.…”

“…The TEM analyses of the nanoparticles indicated a narrow size distribution with AgNPs and AuNPs having 5-6 and 3-4 nm in diameter, respectively (see Supporting Information S7). Partial ligand exchange of the hydrophobic gold nanoparticles was carried out using 11-mercapto-1-undecanol to alter the hydrophobicity of the nanoparticles [28]. The ligand exchanged AuNPs did not have any observable change in size and morphology.…”

Monolayer Protected Clusters of Gold and Silver

“…An even wider range of structures is accessible if the clusters are co-deposited with surfactants, such as, for example, the phospholipid dipalmitoylphosphatidylcholine (DPPC), which forms Langmuir films with well-characterized phase transitions upon compression [98]. While the clusters in the absence of the surfactant tend to aggregate into rafts even in uncompressed films, the surfactant monolayer can to some extent function as a two-dimensional solvent and prevent the clusters from aggregation.…”

“…A TEM study of the lines formed in the presence of DPPC revealed at higher resolution that the constituent clusters had sintered into elongated, worm-like structures, which together formed an extended ªmazeº with the width of the internal ªpathº of molecular dimensions (Fig. 3.6) [98]. Structural instabilities and sintering of MPCs in densely compressed Langmuir films are probably due to the high lateral forces experienced by the particles under compression of the film.…”