Studies on 2D hybrid films of half surfactant-covered Au nanoparticles at the air/water interface

Pang, Shu-Feng; Tetsuya, Oikawa; Watanabe, Tetsu; Kondo, Takeshi; Kawai, Takeshi

doi:10.1016/j.jcis.2004.11.071

Cited by 9 publications

(8 citation statements)

References 27 publications

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“…The AuNP monolayer at the air–water interface was formed from the adsorption of AuNPs dispersed in water onto the DODAC Langmuir monolayer. , 5.5 μL of chloroform solution (0.4 mM) with insoluble cationic surfactant of DODAC was spread on the as-prepared aqueous dispersion of anionic AuNPs. The surface density of DODAC was fixed at 0.40 nm 2 /molecule, which gives rise to a monolayer with a high AuNPs density at the air–water interface .…”

Section: Methodsmentioning

confidence: 99%

“…In this study, to prepare metal NP monolayers on water, we exploited the adsorption phenomenon of metal NPs derived from the electrostatic interaction between metal NPs dispersed in water with an insoluble monolayer on the water surface. This preparation process relies on the fundamentals of the layer-by-layer technique, which we have previously utilized to prepare gold nanoparticle (AuNP) monolayers on water by spreading a water-insoluble cationic surfactant of dioctadecyldimethylammonium chloride (DODAC) onto an aqueous dispersion of anionic AuNPs. − In this work, we applied the UV irradiation technique to fabricate conductive nanosheets on AuNP monolayers prepared via the electrostatic interaction between anionic AuNPs with cationic DODAC monolayers at the air–water interface (Figure ). We also demonstrated the reusability of AuNP dispersions for preparing the conductive Au nanosheets on water, and the as-prepared nanosheets on water can be easily transferred on nonconductive transparent flexible films.…”

Section: Introductionmentioning

confidence: 99%

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Au Nanoparticle Monolayer Nanosheets as Flexible Transparent Conductive Electrodes

Matsukawa

Wang

Imura

et al. 2021

ACS Appl. Nano Mater.

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Flexible and transparent conductive electrodes are fundamental components used in advanced optical and electronic devices and organic electronics. In this work, we demonstrated a method for fabricating transparent conductive electrodes of Au nanosheets using UV irradiation on Au nanoparticle (AuNP) monolayer on water. The adsorbed AuNP monolayer was formed from the electrostatic attractive force between the anionic capping molecules on AuNPs dispersed in water with a cationic insoluble surfactant monolayer on water. UV irradiation promoted the decomposition of the surfactant deposited on the AuNPs, thereby transforming the AuNPs into mesh-like nanosheets that served as flexible and transparent conducting electrodes. The AuNP dispersions were also proven to be reusable in preparing conductive Au nanosheets for transparent flexible electrodes.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Au Nanoparticle Monolayer Nanosheets as Flexible Transparent Conductive Electrodes

Matsukawa

Wang

Imura

et al. 2021

ACS Appl. Nano Mater.

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“…Ethanol, as a low−dielectric solvent, can decrease the surface−charge density of the colloidal particles and adjust the contact angle of the particles with the interface close to 90° . Liquid−gas interfaces are the alternatively employed ones to achieve assemblies of hydrophobic colloidal Au NPs either by the classical Langmuir−Blodgett (L−B) technique ,− or by templating methods . Surface modifications of colloidal gold nanocrystals with functional ligands have also been widely used for the self-assemblies in solutions through ligand interactions like hydrogen bonds, DNA hybridization, and antigen−antibody recognition. − …”

Section: Introductionmentioning

confidence: 99%

Nanoassemblies of Colloidal Gold Nanoparticles by Oxygen-Induced Inorganic Ligand Replacement

et al. 2010

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This article reports a novel method of the fabrication of floating ultrathin nanoporous films and superlattice-like bottom sediment flakes of colloidal gold nanoparticles (Au NPs) by the oxygen-induced ligand replacement of inorganic species. The two nanoassemblies were realized in a weighing bottle simply by aging the Au colloid, which was synthesized and stabilized using more divalent tin Sn(II) than required for the reduction of HAuCl(4). In situ Raman spectroscopy was employed to trace the assembly process, and we found that the protective Sn(II) species (mostly SnCl(3)(-)) of the gold colloid could be gradually replaced by Cl(-) ions in the solution, while the strongly chemically adsorbed Sn(II) species on the Au NPs was oxidized by O(2) from the air contact. The destabilized colloidal Au NPs by the ligand replacement of SnCl(3)(-) with Cl(-) first assembled into an ultrathin nanoporous film at the air-water interface and then sedimentated to the bottom. Superlattice-like sediment flakes of Au NPs can be obtained at lower temperature (approximately 5 degrees C). Particularly, this method does not involve any organic substances, providing clean ultrathin nanoporous films and superlattice-like flakes of Au NPs. The ultrathin nanoporous films and superlattice-like flakes of Au NPs can serve as SERS substrates with strong and long activity.

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“…AuNP monolayer samples for TEM measurements were fabricated on a 250 mesh carbon-covered Cu grid (Okenshoji ELS-C10) using a horizontal method [8]. The samples were examined using a JEOL JEM-1011 transmission electron microscope operating at 100 kV.…”

Section: Temmentioning

confidence: 99%

“…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.…”

Section: Introductionmentioning

confidence: 99%

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

2017

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Abstract. Nanoparticle monolayers at the air-water interface have received broad attention because of their potential applications owing to the tunability of their surface properties. We prepared gold nanoparticle monolayers by adsorption of hydrophilized nanoparticles from solution onto Langmuir monolayers of amphiphilic organic molecules (polyion complexes of deuterated stearic acid and polyallylamine) at the airwater interface, followed by adsorption of dodecyltrimethylammonium bromide onto the underside of these particles. The infrared external reflection spectra of the monolayers recorded both during and after preparation showed that the adsorption of gold nanoparticles on the Langmuir monolayers and that of dodecyltrimethylammonium bromide on the nanoparticles occurred in several tens of minutes. The infrared spectra also showed that both stearic acid and dodecyltrimethylammonium bromide molecules were highly ordered on the gold nanoparticles at the air-water interface. These results suggested that this preparation procedure is a useful fabrication method for Janus particles.

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Studies on 2D hybrid films of half surfactant-covered Au nanoparticles at the air/water interface

Cited by 9 publications

References 27 publications

Au Nanoparticle Monolayer Nanosheets as Flexible Transparent Conductive Electrodes

Au Nanoparticle Monolayer Nanosheets as Flexible Transparent Conductive Electrodes

Nanoassemblies of Colloidal Gold Nanoparticles by Oxygen-Induced Inorganic Ligand Replacement

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

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