Ag/Rh Bimetallic Nanoparticles Formed by Self-assembly from Ag and Rh Monometallic Nanoparticles in Solution

2003 ◽  
Vol 32 (1) ◽  
pp. 78-79 ◽  
Author(s):  
Kazutaka Hirakawa ◽  
Naoki Toshima
Keyword(s):  
Self Assembly ◽  
Bimetallic Nanoparticles ◽  
Monometallic Nanoparticles

Green synthesis of mixed metallic nanoparticles using room temperature self-assembly

2017 ◽  
Vol 13 (2) ◽  
pp. 4671-4677 ◽  
Author(s):  
A. M. Abdelghany ◽  
A.H. Oraby ◽  
Awatif A Hindi ◽  
Doaa M El-Nagar ◽  
Fathia S Alhakami
Keyword(s):  
Self Assembly ◽  
Metallic Nanoparticles ◽  
Room Temperature ◽  
Bimetallic Nanoparticles ◽  
Reduction Process ◽  
Nano Particles ◽  
Nano Structure ◽  
Small Shift ◽  
Molar Ratios ◽  
Vis Spectroscopy

Bimetallic nanoparticles of silver (Ag) and gold (Au) were synthesized at room temperature using Curcumin. Reduction process of silver and gold ions with different molar ratios leads to production of different nanostructures including alloys and core-shells. Produced nanoparticles were characterized simultaneously with FTIR, UV/vis. spectroscopy, transmission electron microscopy (TEM), and Energy-dispersive X-ray (EDAX). UV/vis. optical absorption spectra of as synthesized nanoparticles reveals presence of surface palsmon resonance (SPR) of both silver at (425 nm) and gold at (540 nm) with small shift and broadness of gold band after mixing with resucing and capping agent in natural extract which suggest presence of bimetallic nano structure (Au/Ag). FTIR and EDAX data approve the presence of bimetallic nano structure combined with curcumin extract. TEM micrographs shows that silver and gold can be synthesized separately in the form of nano particles using curcumin extract. Synthesis of gold nano particles in presence of silver effectively enhance and control formation of bi-metallic structure.

scholarly journals Au–Ag and Pt–Ag bimetallic nanoparticles@halloysite nanotubes: morphological modulation, improvement of thermal stability and catalytic performance

RSC Advances ◽  
2018 ◽  
Vol 8 (19) ◽  
pp. 10237-10245 ◽  
Author(s):  
Siyu Li ◽  
Feng Tang ◽  
Huixin Wang ◽  
Junran Feng ◽  
Zhaoxia Jin
Keyword(s):  
Thermal Stability ◽  
Bimetallic Nanoparticles ◽  
Catalytic Performance ◽  
Halloysite Nanotubes ◽  
Monometallic Nanoparticles

Bimetallic Au–Ag@HNT and Pt–Ag@HNT nanocages showed significantly improved efficiency in the oxidation of o-phenylenediamine as peroxidase-like catalyst compared with corresponding monometallic nanoparticles.

Novel Formation of Ag/Au Bimetallic Nanoparticles by Physical Mixture of Monometallic Nanoparticles in Dispersions and Their Application to Catalysts for Aerobic Glucose Oxidation

Langmuir ◽  
2013 ◽  
Vol 29 (33) ◽  
pp. 10330-10339 ◽  
Author(s):  
Haijun Zhang ◽  
Minori Haba ◽  
Mitsutaka Okumura ◽  
Tomoki Akita ◽  
Shinji Hashimoto ◽  
...  
Keyword(s):  
Glucose Oxidation ◽  
Bimetallic Nanoparticles ◽  
Physical Mixture ◽  
Monometallic Nanoparticles

A comparison of the catalytic efficiency of copper-based bimetallic nanoparticles in the click reactions

2020 ◽  
Vol 44 (9-10) ◽  
pp. 566-570
Author(s):  
Ning Li ◽  
Xiang Liu
Keyword(s):  
Catalytic Activity ◽  
Quantum Dot ◽  
Physical Properties ◽  
Bimetallic Nanoparticles ◽  
Click Reaction ◽  
Catalytic Efficiency ◽  
Click Reactions ◽  
Graphene Quantum Dot ◽  
Catalytic Activities ◽  
Monometallic Nanoparticles

Compared to monometallic nanoparticles, bimetallic nanoparticles have attracted wide attention due to their physical properties, excellent catalytic activity, high regioselectivity, selectivity, and stability. Here, we have first synthesized 10 different kinds of graphene quantum dot–stabilized Cu-based bimetallic nanoparticles (including CoCu, NiCu, RuCu, RhCu, PdCu, AgCu, IrCu, AuCu, FeCu, and PtCu) and compared their catalytic activities in a CuAAC click reaction. Among them, RhCu provides the highest yield of the desired product in the click reaction (77%). The catalytic activity of these MCu in the click reaction is in the order: RhCu > PdCu > AuCu > CoCu > PtCu > AgCu > NiCu > CuNP > RuCu > FeCu > IrCu.

scholarly journals Latest Novelties on Plasmonic and Non-Plasmonic Nanomaterials for SERS Sensing

Nanomaterials ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 1200 ◽  
Author(s):  
Grégory Barbillon
Keyword(s):  
Charge Transfer ◽  
Self Assembly ◽  
Spatial Organization ◽  
Bimetallic Nanoparticles ◽  
Plasmonic Nanostructures ◽  
Sers Enhancement ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Sers Sensing

An explosion in the production of substrates for surface enhanced Raman scattering (SERS) has occurred using novel designs of plasmonic nanostructures (e.g., nanoparticle self-assembly), new plasmonic materials such as bimetallic nanomaterials (e.g., Au/Ag) and hybrid nanomaterials (e.g., metal/semiconductor), and new non-plasmonic nanomaterials. The novel plasmonic nanomaterials can enable a better charge transfer or a better confinement of the electric field inducing a SERS enhancement by adjusting, for instance, the size, shape, spatial organization, nanoparticle self-assembly, and nature of nanomaterials. The new non-plasmonic nanomaterials can favor a better charge transfer caused by atom defects, thus inducing a SERS enhancement. In last two years (2019–2020), great insights in the fields of design of plasmonic nanosystems based on the nanoparticle self-assembly and new plasmonic and non-plasmonic nanomaterials were realized. This mini-review is focused on the nanoparticle self-assembly, bimetallic nanoparticles, nanomaterials based on metal-zinc oxide, and other nanomaterials based on metal oxides and metal oxide-metal for SERS sensing.

Biosynthesis of Fe, Pd, and Fe–Pd bimetallic nanoparticles and their application as recyclable catalysts for [3 + 2] cycloaddition reaction: a comparative approach

2015 ◽  
Vol 5 (5) ◽  
pp. 2612-2621 ◽  
Author(s):  
Kanchan Mishra ◽  
Nagaraj Basavegowda ◽  
Yong Rok Lee
Keyword(s):  
Catalytic Activity ◽  
Bimetallic Nanoparticles ◽  
Cycloaddition Reaction ◽  
Comparative Approach ◽  
Recyclable Catalysts ◽  
Monometallic Nanoparticles

The Fe–Pd bimetallic nanoparticles exhibit strong catalytic activity compared to their respective monometallic nanoparticles.

Novel formation of Au/Ag bimetallic nanoparticles from a mixture of monometallic nanoparticles and their application for the rapid detection of lead in onion samples

2020 ◽  
Vol 44 (35) ◽  
pp. 15010-15017
Author(s):  
Sushama Sahu ◽  
Srishti Sharma ◽  
Kallol K. Ghosh
Keyword(s):  
Rapid Detection ◽  
Bimetallic Nanoparticles ◽  
Colorimetric Detection ◽  
Gold Silver ◽  
Monometallic Nanoparticles

Characterization of gold, silver and gold/silver bimetallic nanoparticles for colorimetric detection of lead in onion samples.

scholarly journals Growth mechanisms of self-assembled gold nanoparticles in Deep Eutectic Solvent

2014 ◽  
Vol 70 (a1) ◽  
pp. C891-C891
Author(s):  
Vikram Singh Raghuwanshi ◽  
Miguel Ochmann ◽  
Frank Polzer ◽  
Armin Hoell ◽  
Klaus Rademann
Keyword(s):  
Gold Nanoparticles ◽  
Self Assembly ◽  
Optical Switching ◽  
Bimetallic Nanoparticles ◽  
Volume Fraction ◽  
Choline Chloride ◽  
Deep Eutectic Solvent ◽  
The Self ◽  
Gold Sputtering ◽  
Self Assembled

Self-assembled metallic nanoparticles are attractive candidates for plasmonic heating, non-linear optical switching [1], bio-analytical, chemical [2], catalytic , and surface enhanced RAMAN scattering (SERS) [3]. These applications are strongly dependent on the shape, size, composition, size distribution and volume fraction of nanoparticles. Here, self-assembly of gold nanoparticles (AuNPs) was obtained by low energy sputter deposition on Deep Eutectic Solvent (DES ; choline chloride and urea) surfaces and elucidated by Small Angle X-ray Scattering (SAXS), Cryogenic Transmission Electron Microscopy (Cryo-TEM) and UV-Vis. Data analysis shows the formation of spherically shaped AuNPs of 5 nm in diameter with narrow size distributions. Moreover, analysis reveals that prolongation of gold-sputtering time has no effect on the size of the particles and only the concentration of AuNPs increases linearly. The growth of the maxima in evaluated structure factor S(q) and the distance distribution function G(r) at higher concentrations of AuNPs is caused by the interference effects. Moreover, it indicates that the particles are not arranged in random but have a self-assembly in short-range order. Prolonged gold-sputtering time leads to increase in the ordering of the AuNPs with strong interactions. It is proposed that the self-assembly of AuNPs is due to the ionic liquid template effects of DES and the balancing physical forces. Moreover, a disulfide based stabilizer bis ((2-Mercaptoethyl) trimethylammonium) disulfide dichloride was applied to supress the self-assembly. The stabilizer even reverses the self-assembled or agglomerated AuNPs back to stable 5 nm individual particles. The templating effect of DES is compared with the non-templating solvent Castor oil. Our results will also pave a way to understand and control self-assembly of metallic and bimetallic nanoparticles.

In vitro and in vivo polysaccharides assembly: ultrastructural and cytochemical study of growing plant cell wall components.

1978 ◽  
Vol 36 (2) ◽  
pp. 434-435
Author(s):  
D. Reis ◽  
B. Vian ◽  
J. C. Roland
Keyword(s):  
Cell Wall ◽  
Self Assembly ◽  
Plant Cell Wall ◽  
Higher Plants ◽  
Three Dimensional ◽  
Cytochemical Study ◽  
Wall Components

Wall morphogenesis in higher plants is a problem still open to controversy. Until now the possibility of a transmembrane control and the involvement of microtubules were mostly envisaged. Self-assembly processes have been observed in the case of walls of Chlamydomonas and bacteria. Spontaneous gelling interactions between xanthan and galactomannan from Ceratonia have been analyzed very recently. The present work provides indications that some processes of spontaneous aggregation could occur in higher plants during the formation and expansion of cell wall.Observations were performed on hypocotyl of mung bean (Phaseolus aureus) for which growth characteristics and wall composition have been previously defined.In situ, the walls of actively growing cells (primary walls) show an ordered three-dimensional organization (fig. 1). The wall is typically polylamellate with multifibrillar layers alternately transverse and longitudinal. Between these layers intermediate strata exist in which the orientation of microfibrils progressively rotates. Thus a progressive change in the morphogenetic activity occurs.

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