Preparation of Ag/SiO<sub>2</sub> Nanosize Composites by a Reverse Micelle and Sol−Gel Technique

Li, Tuo; Moon, Jooho; Morrone, A.; Mecholsky, John J.; Talham, Daniel R.; Adair, James H.

doi:10.1021/la970801o

Cited by 229 publications

(200 citation statements)

References 25 publications

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AbstractA new thioester functionalized calix [8]arene derivative is used for the synthesis of metallic Pd, Pt and Ru nanoparticles, exhibiting several interesting features such as stability and remarkable surface functionalization. Crystalline particles of very small dimensions and good dispersion have been obtained.

Keywords: Calixarenes; Nanoparticles; Surface functionalization

There is presently a considerable interest for the study and the use of metallic or semiconducting nanoparticles because of their novel and attractive physical [1][2][3][4][5] and chemical properties [6,7].

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mentioning

confidence: 99%

A new specifically designed calix[8]arene for the synthesis of functionalized, nanometric and subnanometric Pd, Pt and Ru nanoparticles

Huc

Pelzer

2008

Journal of Colloid and Interface Science

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A new thioester functionalized calix [8]arene derivative is used for the synthesis of metallic Pd, Pt and Ru nanoparticles, exhibiting several interesting features such as stability and remarkable surface functionalization. Crystalline particles of very small dimensions and good dispersion have been obtained. Keywords: Calixarenes; Nanoparticles; Surface functionalizationThere is presently a considerable interest for the study and the use of metallic or semiconducting nanoparticles because of their novel and attractive physical [1][2][3][4][5] and chemical properties [6,7]. In most cases, the solutionphase synthesis of metallic nanoparticles involves the controlled self-condensation of reduced metal centers in the presence of a suitable ligand. This ligand usually acts a stabilizer for the coordinatively unsaturated metal centers, prevents the agglomeration of the nanoparticles and controls the particle's size [8][9][10][11][12][13][14][15][16][17]. The stabilization of nanoparticles by ligands containing multiple anchoring groups is interesting, as it may improve the stability of the ligand shell due to the cooperative binding of all these groups. Moreover, this cooperativity-based strategy may also open the possibility to use individually weakly bonded ligands, without compromising the stability of the nanoparticles. The lability of each individual weak bond between the anchoring group and the surface of the metal may allow for a much greater reactivity of these nanoobjects in catalysis, along with a good stability due to these cooperative effects. Some examples of nanoparticles with ligands containing multiple anchoring groups such as veratrole or calixarene derivatives [18] have been already described.Most of the interesting properties of calixarenes are directly related to their conformational behavior. The grafting of calixarenes onto nanoparticles may ultimately lead to a better conformational control and thus to new properties for these molecules. New properties may also be expected for these nanoparticles/calixarene nanocomposites, for example, in catalysis, where the reactivity of metallic surfaces may be combined with the molecular recognition properties of calixarenes. We show here that a conformationally very flexible calix [8]arene derivative alone leads to the formation of very stable palladium, platinum and ruthenium nanoparticles of small dimensions. This calix [8]arene is functionalized with both thioester and hydroxyl groups. The former allows for the anchoring of the molecules onto the metallic surfaces, the later may be used for an easy post-derivatization of these nanoobjects. A stability test showed that the nanoparticles are not affected by heating for hours in strongly acidic organic solutions.

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Keywords: Calixarenes; Nanoparticles; Surface functionalization

…”

mentioning

confidence: 99%

A new specifically designed calix[8]arene for the synthesis of functionalized, nanometric and subnanometric Pd, Pt and Ru nanoparticles

Huc

Pelzer

2008

Journal of Colloid and Interface Science

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“…The W/O microemulsion route is an easy and efficient method for the preparation of nanoparticles over other existing methodologies [26]. Generally, TEOS and AEPS undergo hydrolysis and copolymerization reactions simultaneously to form the monodisperse spherical nanoparticles.…”

Section: Preparation Of Nanoparticlesmentioning

confidence: 99%

Development of functionalized terbium fluorescent nanoparticles for antibody labeling and time-resolved fluoroimmunoassay application

Tan

Wang

et al. 2004

Talanta

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“…By changing the thickness of the silica shell and diameter of gold core, direct control of effectiveness in an optical instrument became possible. To coat nanoparticles of gold and silver with amorphous silica, a technique of coating a monolayer in gold employing an amine terminated silane coupling agent has been reported [8][9][10], but recently a new technique by LizMarzan, a slight modification of Stober method, was reported that direct coating onto nanoparticles of iron oxide and silver nanowire could be possible by applying silica shell with precise control [11][12][13]. This study was focused on the investigation of scientific characteristic of silica shell thickness coated on gold nanoparticles with applying no silane-coupling agent.…”

Section: Introductionmentioning

confidence: 99%

Characteristic optical properties and synthesis of gold–silica core–shell colloids

2006

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Gold-Silica Core-Shell colloid was synthesized that can be used for the optical instruments like photonic crystal and plasmonic waveguides serving as a building block. Gold nanoparticles could be directly coated with uniform shells of amorphous silica without silane coupling agent to simplify the process. It was confirmed that the thickness of coated silica shells could be varied from tens to several hundred nanometers by controlling the precipitation time and concentration of TEOS.

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Preparation of Ag/SiO₂ Nanosize Composites by a Reverse Micelle and Sol−Gel Technique

Cited by 229 publications

References 25 publications

A new specifically designed calix[8]arene for the synthesis of functionalized, nanometric and subnanometric Pd, Pt and Ru nanoparticles

A new specifically designed calix[8]arene for the synthesis of functionalized, nanometric and subnanometric Pd, Pt and Ru nanoparticles

Development of functionalized terbium fluorescent nanoparticles for antibody labeling and time-resolved fluoroimmunoassay application

Characteristic optical properties and synthesis of gold–silica core–shell colloids

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Preparation of Ag/SiO2 Nanosize Composites by a Reverse Micelle and Sol−Gel Technique

Cited by 229 publications

References 25 publications

A new specifically designed calix[8]arene for the synthesis of functionalized, nanometric and subnanometric Pd, Pt and Ru nanoparticles

A new specifically designed calix[8]arene for the synthesis of functionalized, nanometric and subnanometric Pd, Pt and Ru nanoparticles

Development of functionalized terbium fluorescent nanoparticles for antibody labeling and time-resolved fluoroimmunoassay application

Characteristic optical properties and synthesis of gold–silica core–shell colloids

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Preparation of Ag/SiO₂ Nanosize Composites by a Reverse Micelle and Sol−Gel Technique