Synthesis of gold particles in organized molecular assembly films

Moriguchi, Isamu; Fujiyoshi, Noriko; Sakamoto, Ryutaro; Teraoka, Yasutake; Kagawa, Shuichi

doi:10.1016/s0927-7757(96)03936-2

Cited by 5 publications

(5 citation statements)

References 30 publications

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“…To understand the gold reduction results presented below, we must first consider two important points. The first is the formation of insoluble 1:1 ion pairs between AuCl 4 - and cationic surfactants, , a general phenomenon exhibited by other complex ions of heavy metals, which has been effectively used for the production of mesostructured materials from alkylamines …”

Section: Resultsmentioning

confidence: 99%

Gold Colloids from Cationic Surfactant Solutions. 1. Mechanisms That Control Particle Morphology

et al. 2002

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The mechanism of formation of gold particles by reduction of Au III in solutions of alcyltrimethylammonium chloride surfactants was studied in the absence and in the presence of NaCl. Au III anions interact strongly with trimethylammonium cations forming insoluble ion pairs (Torigoe et al. Langmuir 1992, 8, 59). Above the surfactant critical micelle concentration, the ion pairs are solubilized in the micelles returning to the solution. Gold particles were produced by photochemical reduction of the clear micellar solutions. The coupling between surfactant aggregation and inorganic crystallization phenomena in these systems was investigated using transmission electron microscopy (TEM), UV-vis, and time-resolved fluorescence spectroscopy. At concentrations close to the phase boundary of the L1 phase with the lyotropic liquid crystalline phases many gold particles have a threadlike morphology, as previously noted by Esumi et al. (Langmuir 1995, 11, 3285). The presence of NaCl modifies the micellar size and affects the gold crystallization process in surprising and unexpected ways, as evidenced by intermediate structures observed by TEM. Our observations support the idea that the formation of threadlike gold particles occurs primarily through a combination of crystal aggregation and specific crystal face stabilization and not through templating mechanisms.

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Section: Resultsmentioning

confidence: 99%

Gold Colloids from Cationic Surfactant Solutions. 1. Mechanisms That Control Particle Morphology

et al. 2002

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“…4). These Bragg peaks indicate that the composite film forms a well-organized multi-bilayer structure with an interlayer spacing of 29.45 A ˚, which was smaller than that of the original DODA film (31 A ˚), 23 and suggests that the bilayer components become even more tilted. Considering the XRD result, the length of DODA (ca.…”

Section: X-ray Diffractionmentioning

confidence: 94%

“…This is in accordance with the well-known fact that the constituent amphiphilic molecules are less orientated in multi-bilayer films than in LB films. 23 ) bands at about 769-625 nm. 5 The appearance of IVCT bands and the weakening of the absorption peaks in the UV region show that electron transfer occurs between the organic substrates and the heteropolyanions, converting the heteropolyanions to heteropolyblues with simultaneous oxidation of the organic substrates.…”

Section: X-ray Diffractionmentioning

confidence: 99%

Self-assembled organic–inorganic composite superlattice thin films incorporating photo- and electro-chemically active phosphomolybdate anion

Zhang

Feng

et al. 2002

J. Mater. Chem.

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A highly ordered multilayer film was formed by casting chloroform solutions of an ionic complex between a dimethyldioctadecylammonium (DODA) and a phosphomolybdate anion PMo 12 O 40 32 (PMo 12 ) on a glassy carbon electrode and solid substrates (CaF 2 , quartz, and borosilicate glass). A well-ordered lamellar superlattice structure was identified by X-ray diffraction (XRD) and differential scanning calorimetry (DSC) experiments. IR spectra showed that the Keggin structure of the phosphomolybdate anion is preserved in the composite film. The superlattice film showed good photochromic and electrochemical properties. Irradiated with UV light, the transparent film changed from colorless to blue. Then, bleaching occurred when the film was in contact with ambient air or O 2 in the dark. A possible photochromic mechanism was proposed according to electron paramagnetic resonance (EPR), Fourier transform infrared spectra (FTIR), UV-vis spectra, and related literature. The electrochemical behavior of the composite film was also examined by cyclic voltammetry in detail.

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“…À transferring from the aqueous solution into the toluene phase is one of the most important steps in synthesizing the Au NPs, 33 in which the formation of ion pairs based on electrostatic interactions between phase transfer agents and AuCl 4 À is essential. 20,33,34 Di-C n Ph is pH sensitive and has different charge densities in the headgroup at different pH values. 24 Hence, the electrostatic interaction between Di-C n Ph and AuCl 4 À is affected by the solution pH, which plays a major role in the transferring of AuCl 4 À from the aqueous to organic phase.…”

Section: Effects Of the Hydrophobic Chain Length On The Size Of Au Npsmentioning

confidence: 99%

Size-controlled preparation of gold nanoparticles with novel pH responsive gemini amphiphiles

Cheng

Dong

2015

J. Mater. Chem. C

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Synthesis of gold particles in organized molecular assembly films

Cited by 5 publications

References 30 publications

Gold Colloids from Cationic Surfactant Solutions. 1. Mechanisms That Control Particle Morphology

Gold Colloids from Cationic Surfactant Solutions. 1. Mechanisms That Control Particle Morphology

Self-assembled organic–inorganic composite superlattice thin films incorporating photo- and electro-chemically active phosphomolybdate anion

Size-controlled preparation of gold nanoparticles with novel pH responsive gemini amphiphiles

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