Synthesis and reactions of functionalised gold nanoparticles

Brust, Mathias; Fink, J.; Bethell, Donald; Schiffrin, David J.; Kiely, Christopher J.

doi:10.1039/c39950001655

Cited by 1,162 publications

(972 citation statements)

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“…9,10 Various methods are being used to produce these materials in such abundance as to allow their characterization by means of well-known chemical and physical techniques. 6,11,12 The solution phase, gas (aerosol) phase, and reverse-micelle methods have been the most popular nanocrystal production techniques lately.An important factor in the production of nanocrystals is the ability to keep them physically isolated from one another. Many different types of systems have been used for nanocrystal passivation as well as exchange of one surfactant for another.…”

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confidence: 99%

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High-Temperature Stability of Passivated Silver Nanocrystal Superlattices

Harfenist

Wang

1999

J. Phys. Chem. B

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Ordered arrays of ∼4.5 nm diameter silver nanocrystals passivated with dodecanethiol show remarkable thermal stability at temperatures up to 975 K. Defects in the ordered-assembly were the first areas to show signs of melting while much of the structure remained intact. The mechanism for their stability is attributed to the unusually strong inter-nanocrystal bond formed by the interpenetration of thiol chains between neighboring nanocrystals within the nanocrystal superlattice. Individually dispersed nanocrystals show stability up to 800 K while some persist until 975 K.The potential application of nanoscale materials in fields ranging from biology to electronics has spurred remarkable interest and investigation into the preparation and characterization of identical, isolated, nanometer-scale entities composed of materials such as metals, 1,2 semiconductors, 3 magnetic materials, 4 and a wide variety of others. 5,6 Applications in catalysis and biological tagging 7 and the possibility of nanometer-sized magnetic domains for ultrahigh-density recording media 4 are just a few of their many possible uses. The subsequent organization of identical passivated nanometer-scale objects into micron-scale ordered arrays gives encouragement to the use of these novel materials particularly in regards to their collective nonlinear optical properties where stability at high temperatures is necessary. 8 The studies of nanometer-sized crystallites over the past twenty years and more recently their composite structures have been numerous. 9,10 Various methods are being used to produce these materials in such abundance as to allow their characterization by means of well-known chemical and physical techniques. 6,11,12 The solution phase, gas (aerosol) phase, and reverse-micelle methods have been the most popular nanocrystal production techniques lately.An important factor in the production of nanocrystals is the ability to keep them physically isolated from one another. Many different types of systems have been used for nanocrystal passivation as well as exchange of one surfactant for another. 3,7,13 Factors such as the binding energy of the headgroups to the nanocrystal surface, 14 how the exposed tails affect the solubility and reactivity of the passivated nanocrystal (i.e., its functionality), 10 the effect of the passivation agent on the electronic and optical properties of the nanocrystal core, the electronic properties of the surfactant material itself, 15 and, further, the agent's ability to bind or link nanocrystals together both structurally and electronically [16][17][18] are all very important conditions placed on a material that will allow the nanocrystal to be stable and isolated yet not affect its core material's properties. Here we present an in-situ temperature analysis of the aforementioned nanocrystals and their superlattices and show that not only do individual passivated silver nanocrystals supported on an amorphous carbon film remain stable at temperatures near 800 K, but also that the silver nanocrystal superc...

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confidence: 99%

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confidence: 99%

High-Temperature Stability of Passivated Silver Nanocrystal Superlattices

Harfenist

Wang

1999

J. Phys. Chem. B

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“…In the preparation method, amino acids initially act as reducing agent and then bind to GNPs surface. This is due to the fact that both the Au and N atoms of amine group in the amino acid are soft [5,[12][13][14][15][16][17][18]. Figure 4b schematically demonstrates the aspartic acid binding to GNPs surface.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Gold Nanoparticles Coated with Aspartic Acid and Their Conjugation with FVIII Protein and FVIII Antibody

et al. 2013

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Carboxylate-modified gold nanoparticles (GNPs) were synthesized in a simple one-step process based on the reduction of tetrachloroauric acid by aspartic acid in water. GNPs were identified by UV-Vis spectroscopy, dynamic light scattering (DLS) and transmission electron microscopy. Conjugation of protein molecules with functionalized nanoparticles was performed through electrostatic interaction. The GNP-protein conjugates were characterized by gel electrophoresis. The interaction between functionalized GNPs and protein molecules lead to conformational transition of protein structure after conjugation of protein with GNPs. This process was investigated by fluorescence spectroscopy and circular dichroism spectroscopy.

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“…These aromatic ligands show a stretch at the 1435-1904 cm À1 range, which represents the C@C bonds, and the counter ion (PF 6 ) show a strong band at 853 cm À1 , due the P-F stretching.…”

Section: Syntheses and Non-covalent Interaction Between Aunps And Rutmentioning

confidence: 99%

“…10 to 150 nm AuNPs, and the Brust-Schiffrin [5,6] method, to obtain hydrophobic AuNPs with diameters in 1 to ca. 8 nm ranges are still major synthetic routes [2].…”

Section: Introductionmentioning

confidence: 99%