Ligand-stabilized metal nanoparticles in organic solvent

Nath, Sankar Kumar; Jana, Subhra; Pradhan, Mukul; Pal, Tarasankar

doi:10.1016/j.jcis.2009.09.049

Cited by 71 publications

(47 citation statements)

References 205 publications

(262 reference statements)

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“…Because thiol functional groups have a higher binding affinity to gold surface as compared with amino groups, 31 it was interesting to study the interaction of thiol-functionalized porphyrins with Au-NPs. The fluorescence quenching of porphyrin 4 results is shown in Figure S2a (SI).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Binding Strength of Porphyrin−Gold Nanoparticle Hybrids Based on Number and Type of Linker Moieties and a Simple Method To Calculate Inner Filter Effects of Gold Nanoparticles Using Fluorescence Spectroscopy

et al. 2015

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Gold nanoparticle-porphyrin assemblies were formed by binding functionalized porphyrins to gold nanoparticles (Au-NPs). Spectroscopic properties of hybrids and binding strength of porphyrins to Au-NPs were observed based on number and type of linker moieties using fluorescence spectroscopy. Binding appears to be dependent on number rather than type of linker moieties present on the porphyrin molecules, as tetraaminophenyl porphyrin shows the highest binding among the molecules we studied and causes agglomeration of nanoparticles due to presence of four linker groups. The inner filter effects of Au-NPs are considerably high due to their high extinction coefficient and cause large errors in the evaluation of quenching efficiencies. We have described a very simple method to calculate the inner filter effects of Au-NPs by first loading them with porphyrins and then replacing them with nonfluorescent ligands. The difference in the fluorescence of unbound porphyrins in the presence and absence of Au-NPs describes their inner filter effects.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Binding Strength of Porphyrin−Gold Nanoparticle Hybrids Based on Number and Type of Linker Moieties and a Simple Method To Calculate Inner Filter Effects of Gold Nanoparticles Using Fluorescence Spectroscopy

et al. 2015

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“…The presence of appropriate stabilizers is necessary to prevent their aggregation, which usually results in loss of activity. The stabilization of MNPs can be accomplished by a steric effect [12], an electrostatic effect [13], a combination of both (electrosteric effect) [14], or a ligand [15].…”

Section: Introductionmentioning

confidence: 99%

High catalytic efficiency of palladium nanoparticles immobilized in a polymer membrane containing poly(ionic liquid) in Suzuki–Miyaura cross-coupling reaction

Favier

Pradel

et al. 2015

Journal of Membrane Science

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International audienceThe elaboration of a polymeric catalytic membrane containing palladium nanoparticles is presented. The membrane was prepared using a photo-grafting process with imidazolium-based ionic liquid monomers as modifying agent and microPES® as support membrane. Ionic liquid serves as a stabilizer and immobilizer for the catalytic species, i.e. palladium nanoparticles. The Suzuki–Miyaura cross-coupling reaction was carried out on the catalytic membrane in flow-through configuration. Complete conversion was achieved in 10 s through one single filtration, without formation of byproducts. The apparent reaction rate constant was three orders of magnitude greater than in a batch reactor. No catalyst leaching was detected. This membrane offers the possibility of continuous production with no need for a separation step of the catalyst from the reaction medium

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“…Methods for the synthesis of metal organosols and their potential use in the field of catalysis and surface enhanced Raman spectroscopy (SERS) were discussed. 7 The SERS method allows detection of light scattered by molecules localized near the surface of a metal nanoparticle. This has found application in the analysis of trace amounts of toxic substances.…”

Section: Introductionmentioning

confidence: 99%