Mono and bimetallic nanoparticles of gold, silver and palladium-catalyzed NADH oxidation-coupled reduction of Eosin-Y

Santhanalakshmi, J.; Venkatesan, P.

doi:10.1007/s11051-010-9966-6

Cited by 36 publications

(22 citation statements)

References 30 publications

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“…The presence of a second metal in a bimetallic nanoparticle not only reduces the cost as some noble metal that is substituted by a non-noble one, but also modifies the interactions between atoms giving rise to changes in the structure and surface. The electron interactions between two metal atoms, which are electron-rich, just as the heterometallic bonding interactions change the surface electronic properties of the nanoparticles [12][13][14][15][16][17][18][19]. As a rule, the catalytic behaviour is usually enhanced on bimetallic nanoparticles as compared to monometallic nanoparticles [3,7,[13][14][15][17][18][19][20][21] even at low Rai et al [46] suggest that the synergic cooperation between the two metals is more noticeable in alloyed nanoparticles, due to the higher probability of metal-metal interactions in comparison to core-shell ones.…”

Section: Bimetallic Nanoparticles As Catalystsmentioning

confidence: 99%

On Metal Segregation of Bimetallic Nanocatalysts Prepared by a One-Pot Method in Microemulsions

2017

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A comparative study on different bimetallic nanocatalysts prepared from microemulsions using a one-pot method has been carried out. The analysis of experimental observations, complemented by simulation studies, provides detailed insight into the factors affecting nanoparticle architecture: (1) The metal segregation in a bimetallic nanocatalysts is the result of the combination of three main kinetic parameters: the reduction rate of metal precursors (related to reduction standard potentials), the material intermicellar exchange rate (determined by microemulsion composition), and the metal precursors concentration; (2) A minimum difference between the reduction standard potentials of the two metals of 0.20 V is needed to obtain a core-shell structure. For values ∆ε 0 smaller than 0.20 V the obtaining of alloys cannot be avoided, neither by changing the microemulsion nor by increasing metal concentration; (3) As a rule, the higher the film flexibility around the micelles, the higher the degree of mixture in the nanocatalyst; (4) A minimum concentration of metal precursors is required to get a core-shell structure. This minimum concentration depends on the microemulsion flexibility and on the difference in reduction rates.

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Section: Bimetallic Nanoparticles As Catalystsmentioning

confidence: 99%

On Metal Segregation of Bimetallic Nanocatalysts Prepared by a One-Pot Method in Microemulsions

2017

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“…The EMB oxidation and reduction were carefully demonstrated recently from the electron (e -) reduction and oxidation abilities of EMB at ground state without using catalyzer NaBH 4 [25,26]. The photocatalytic activity of the AgNPs was investigated by choosing the photocatalytic degradation of EMB.…”

Section: Eosin Methylene Blue (Emb)mentioning

confidence: 99%

Catalytic Degradation of Organic Dyes using Synthesized Silver Nanoparticles: A Green Approach

S¹,

M²,

MV³

2015

J Bioremed Biodeg

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The scientific community is search in for new methods for the synthesis of metallic nanoparticles. Green synthesis has now become a vast developing area of new research groups. Here we report a green method to the synthesis of silver nanoparticles (AgNPs) using the different parts of Vishanika or Indian screw tree, an ayurvedic medicinal tree. This is nontoxic, eco-friendly and low cost method. The reduction and stabilization capability of the plant extracts of different parts are described. The size and structure of the silver can be characterized by varying the plant parts of the vishanika. The biosynthesized nanoparticles are characterized by using UV-VIS spectroscopy, TEM, XRD, DLS and FTIR. The size and extract dependent catalytic activity of the biosynthesized nanoparticles is established in the degradation of organic dyes.plant products represent excellent platforms for this purpose [6][7][8]13]. The compounds present in plants that have different potential biological activities; phytochemicals are important natural resource for the synthesis of metal nanoparticles. They play important roles in both stabilization and reduction of nanoparticles. The focus of the present work is to apply the accurate principles of green chemistry for the synthesis of silver nanoparticles by using stem bark, root and leaf of Helicteres isora extracts as stand-alone reducing and capping agent. H. isora plant extracts possess anticancer properties [14]. Usually, the bark and root juice were used against diabetes and emphysema. In traditional medicine, the bark and root juice is claimed to be useful in snake bite, diabetes, blood disorder, cough, colic, diarrhoea, astringent, etc., [15], expectorant and astringent [16], hypolipidemic [17], antihyperglycemic activity and glibenclamide [18]. In the present study, we have investigated the extracts and size dependent catalytic degradation of organic dyes-methyl violet, safranin, eosin methylene blue and methyl orange by in the presence of silver colloids. Materials and MethodsSilver nitrate (99.99%), methyl violet, safranin, eosin methylene blue and methyl orange, were purchased from sigma Aldrich. All glassware's were cleaned with sterile distilled water and rinsed with deionized water. Preparation of extractDifferent parts of (stem bark, root and leaf) H. isora were collected from Western Ghats of Tamil Nadu, washed with sterile distilled water and dried, then make it powder. 1 g of each explants powder was mixed with 100 mL of water and kept on orbital shaker at 120 rpm for 12 h. After that, the extracts were filtered with filter paper and stored at 4 0 C in refrigerator until further use. Journal of Bior emediation & Biodegradation Synthesis of silver nanoparticlesSilver nanoparticles (stem bark (S), root (R) and leaf (L)) have been synthesized by Bhakya et al. [19] method with slight modification. The formation of AgNPs is indicated by the appearance of dark brown color within 5 min. CharacterizationUV-visible spectra analysis was performed for all samples and the abs...

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“…They are particularly important in the field of catalysis since they show superior catalytic properties than their monometallic counterparts 2,3 . The structure of bimetallic NPs depends mainly on the synthesis conditions and the miscibility of the two components 4 . The main structures of bimetallic NPs are core-shell, mixed alloys, Janus and multishell alloys configurations.…”

Section: Introductionmentioning

confidence: 99%

Study of PtPd Bimetallic Nanoparticles for Fuel Cell Applications

et al. 2017

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Bimetallic nanoparticles are of special interest for their potential applications for fuel cells, mainly for portable power applications. Among the bimetallic systems, Pt-Pd bimetallic nanoparticles have received great interest as they can be widely used as effective catalysts for various electrochemical reactions. In this work, Pt-Pd alloy bimetallic nanoparticles were synthesized through a chemical reduction method. The nanoparticles were characterized using aberration-corrected scanning/transmission electron microscopy (STEM). Also, parallel beam X-Ray diffraction analysis was carried out to evaluate the crystallographic structure. High-angle annular dark field (HAADF)-STEM images of the Pt-Pd bimetallic nanoparticles were obtained. The contrast of the images shows that the nanoparticles have an alloy structure with an average size of 7.15 nm. To understand the properties of the bimetallic nanoparticles, it is necessary to know the distribution of the elements in the nanostructure. We have used a semi-quantitative method to analyze the HAADF-STEM images, which allowed us to measure the total intensity of the scattered electrons for each atomic column. HAADF-STEM images of the Pt-Pd bimetallic nanoparticles were compared directly with image simulations, good agreement between simulation and experimental images was found. Cyclic voltammetry studies were carried out to analyze the electrochemical behavior of the bimetallic nanoparticles.

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Mono and bimetallic nanoparticles of gold, silver and palladium-catalyzed NADH oxidation-coupled reduction of Eosin-Y

Cited by 36 publications

References 30 publications

On Metal Segregation of Bimetallic Nanocatalysts Prepared by a One-Pot Method in Microemulsions

On Metal Segregation of Bimetallic Nanocatalysts Prepared by a One-Pot Method in Microemulsions

Catalytic Degradation of Organic Dyes using Synthesized Silver Nanoparticles: A Green Approach

Study of PtPd Bimetallic Nanoparticles for Fuel Cell Applications

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