Seed-Mediated Co-reduction: A Versatile Route to Architecturally Controlled Bimetallic Nanostructures

ACS Nano ◽  
2012 ◽  
Vol 6 (3) ◽  
pp. 2617-2628 ◽  
Author(s):  
Christopher J. DeSantis ◽  
Aaron C. Sue ◽  
Matthew M. Bower ◽  
Sara E. Skrabalak
Keyword(s):  
Seed Mediated ◽  
Bimetallic Nanostructures ◽  
Co Reduction

Synthesis of hollow and trimetallic nanostructures by seed-mediated co-reduction

2015 ◽  
Vol 51 (42) ◽  
pp. 8872-8875 ◽  
Author(s):  
Rebecca G. Weiner ◽  
Alison F. Smith ◽  
Sara E. Skrabalak
Keyword(s):  
Galvanic Replacement ◽  
Seed Mediated ◽  
Co Reduction

Seed-mediated co-reduction coupled with galvanic replacement is a new route to structurally defined trimetallic nanoparticles.

Controllable morphology and highly efficient catalytic performances of Pd–Cu bimetallic nanomaterials prepared via seed-mediated co-reduction synthesis

2020 ◽  
Vol 527 ◽  
pp. 146719 ◽  
Author(s):  
Fangke Zhan ◽  
Juanjuan Yin ◽  
Anqi Zhang ◽  
Jingxin Zhou ◽  
Mingli Wang ◽  
...  
Keyword(s):  
Highly Efficient ◽  
Seed Mediated ◽  
Co Reduction ◽  
Catalytic Performances

Seed-mediated co-reduction in a large lattice mismatch system: synthesis of Pd–Cu nanostructures

Nanoscale ◽  
2017 ◽  
Vol 9 (22) ◽  
pp. 7570-7576 ◽  
Author(s):  
Meredith R. Kunz ◽  
Sophia M. McClain ◽  
Dennis P. Chen ◽  
Kallum M. Koczkur ◽  
Rebecca G. Weiner ◽  
...  
Keyword(s):  
Lattice Mismatch ◽  
System Synthesis ◽  
Large Lattice ◽  
Large Lattice Mismatch ◽  
Seed Mediated ◽  
Co Reduction ◽  
Cu Nanostructures

Seed-Mediated Co-reduction as a Route To Shape-Controlled Trimetallic Nanocrystals

2016 ◽  
Vol 28 (12) ◽  
pp. 4139-4142 ◽  
Author(s):  
Rebecca G. Weiner ◽  
Sara E. Skrabalak
Keyword(s):  
Shape Controlled ◽  
Seed Mediated ◽  
Co Reduction

scholarly journals Seeding a New Kind of Garden: Synthesis of Architecturally Defined Multimetallic Nanostructures by Seed-Mediated Co-Reduction

2015 ◽  
Vol 48 (10) ◽  
pp. 2688-2695 ◽  
Author(s):  
Rebecca G. Weiner ◽  
Meredith R. Kunz ◽  
Sara E. Skrabalak
Keyword(s):  
Seed Mediated ◽  
Co Reduction

Seed-mediated synthesis and PEG coating of gold nanoparticles for controlling morphology and sizes

MRS Advances ◽  
2020 ◽  
Vol 5 (63) ◽  
pp. 3353-3360
Author(s):  
Susana Helena Arellano Ramírez ◽  
Perla García Casillas ◽  
Christian Chapa González
Keyword(s):  
Gold Nanoparticles ◽  
Polyethylene Glycol ◽  
Room Temperature ◽  
Colloidal Stability ◽  
Infrared Spectrometry ◽  
Ammonium Bromide ◽  
Chloroauric Acid ◽  
Vis Spectroscopy ◽  
Seed Mediated ◽  
Peg Coating

AbstractA significant area of research is biomedical applications of nanoparticles which involves efforts to control the physicochemical properties through simple and scalable processes. Gold nanoparticles have received considerable attention due to their unique properties that they exhibit based on their morphology. Gold nanospheres (AuNSs) and nanorods (AuNRs) were prepared with a seed-mediated method followed of polyethylene glycol (PEG)-coating. The seeds were prepared with 0.1 M cetyltrimethyl-ammonium bromide (CTAB), 0.005 M chloroauric acid (HAuCl4), and 0.01 M sodium borohydride (NaBH4) solution. Gold nanoparticles with spherical morphology was achieved by growth by aggregation at room temperature, while to achieve the rod morphology 0.1 M silver nitrate (AgNO3) and 0.1 M ascorbic acid solution were added. The gold nanoparticles obtained by the seed-mediated synthesis have spherical or rod shapes, depending on the experimental conditions, and a uniform particle size. Surface functionalization was developed using polyethylene glycol. Morphology, and size distribution of AuNPs were evaluated by Field Emission Scanning Electron Microscopy. The average size of AuNSs, and AuNRs was 7.85nm and 7.96 x 31.47nm respectively. Fourier transform infrared spectrometry was performed to corroborate the presence of PEG in the AuNPs surface. Additionally, suspensions of AuNSs and AuNRs were evaluated by UV-Vis spectroscopy. Gold nanoparticles were stored for several days at room temperature and it was observed that the colloidal stability increased once gold nanoparticles were coated with PEG due to the shield formed in the surface of the NPs and the increase in size which were 9.65±1.90 nm of diameter for AuNSs and for AuNRs were 29.03±5.88 and 8.39±1.02 nm for length and transverse axis, respectively.

Synthesis and Characterization of Silver Nanoplates by a Seed-mediated Method

2019 ◽  
Vol 29 (3) ◽  
Author(s):  
Mai Ngọc Tuan Anh
Keyword(s):  
Hydrogen Peroxide ◽  
Silver Nanoparticles ◽  
Ascorbic Acid ◽  
Silver Nitrate ◽  
Sodium Borohydride ◽  
Trisodium Citrate ◽  
Synthesis And Characterization ◽  
Silver Nanoplates ◽  
Seed Mediated

Silver nanoplates (SNPs) having different size were synthesized by a seed-mediated method. The seeds -silver nanoparticles with 4 – 6 nm diameters were synthesized first by reducing silver nitrate with sodium borohydride in the present of Trisodium Citrate and Hydrogen peroxide. Then these seeds were developed by continue reducing Ag\(^+\) ions with various amount of L-Ascorbic acid to form SNPs. Our analysis showed that the concentratrion of L-Ascorbic acid, a secondary reducing agent, played an important role to form SNPs. In addition, the size and in-plane dipole plasmon resonance wavelenght of silver nanoplates were increased when the concentration of added silver nitrate increased. The characterization of SNPs were studied by UV-Vis, FE-SEM, EDS and TEM methods.

High-Entropy Alloys as Catalysts for the CO2 and CO Reduction Reactions

2019 ◽  
Author(s):  
Jack Pedersen ◽  
Thomas Batchelor ◽  
Alexander Bagger ◽  
Jan Rossmeisl
Keyword(s):  
Density Functional ◽  
Rational Design ◽  
Hydrogen Adsorption ◽  
Co Adsorption ◽  
Reduction Reaction ◽  
Supervised Machine Learning ◽  
High Entropy Alloys ◽  
High Entropy ◽  
Co Reduction ◽  
Disordered Alloy

Using the high-entropy alloys (HEAs) CoCuGaNiZn and AgAuCuPdPt as starting points we provide a framework for tuning the composition of disordered multi-metallic alloys to control the selectivity and activity of the reduction of carbon dioxide (CO2) to highly reduced compounds. By combining density functional theory (DFT) with supervised machine learning we predicted the CO and hydrogen (H) adsorption energies of all surface sites on the (111) surface of the two HEAs. This allowed an optimization for the HEA compositions with increased likelihood for sites with weak hydrogen adsorption{to suppress the formation of molecular hydrogen (H2) and with strong CO adsorption to favor the reduction of CO. This led to the discovery of several disordered alloy catalyst candidates for which selectivity towards highly reduced carbon compounds is expected, as well as insights into the rational design of disordered alloy catalysts for the CO2 and CO reduction reaction.

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