Structural and Architectural Evaluation of Bimetallic Nanoparticles: A Case Study of Pt−Ru Core−Shell and Alloy Nanoparticles

ACS Nano ◽  
2009 ◽  
Vol 3 (10) ◽  
pp. 3127-3137 ◽  
Author(s):  
Selim Alayoglu ◽  
Peter Zavalij ◽  
Bryan Eichhorn ◽  
Qi Wang ◽  
Anatoly I. Frenkel ◽  
...  
Keyword(s):  
Bimetallic Nanoparticles ◽  
Core Shell ◽  
Alloy Nanoparticles ◽  
Architectural Evaluation

scholarly journals Light-Scattering Simulations from Spherical Bimetallic Core–Shell Nanoparticles

Micromachines ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 359
Author(s):  
Francesco Ruffino
Keyword(s):  
Optical Properties ◽  
Light Scattering ◽  
Bimetallic Nanoparticles ◽  
Dominant Role ◽  
Scattered Light ◽  
Specific Interaction ◽  
Surface Enhanced Raman Spectroscopy ◽  
Localized Surface Plasmon ◽  
Core Shell ◽  
The Core

Bimetallic nanoparticles show novel electronic, optical, catalytic or photocatalytic properties different from those of monometallic nanoparticles and arising from the combination of the properties related to the presence of two individual metals but also from the synergy between the two metals. In this regard, bimetallic nanoparticles find applications in several technological areas ranging from energy production and storage to sensing. Often, these applications are based on optical properties of the bimetallic nanoparticles, for example, in plasmonic solar cells or in surface-enhanced Raman spectroscopy-based sensors. Hence, in these applications, the specific interaction between the bimetallic nanoparticles and the electromagnetic radiation plays the dominant role: properties as localized surface plasmon resonances and light-scattering efficiency are determined by the structure and shape of the bimetallic nanoparticles. In particular, for example, concerning core-shell bimetallic nanoparticles, the optical properties are strongly affected by the core/shell sizes ratio. On the basis of these considerations, in the present work, the Mie theory is used to analyze the light-scattering properties of bimetallic core–shell spherical nanoparticles (Au/Ag, AuPd, AuPt, CuAg, PdPt). By changing the core and shell sizes, calculations of the intensity of scattered light from these nanoparticles are reported in polar diagrams, and a comparison between the resulting scattering efficiencies is carried out so as to set a general framework useful to design light-scattering-based devices for desired applications.

Continuous-Flow Syntheses of Alloy Nanoparticles

2021 ◽  
Author(s):  
Kohei Kusada ◽  
Hiroshi Kitagawa
Keyword(s):  
Solid Solution ◽  
Optical Properties ◽  
Continuous Flow ◽  
Core Shell ◽  
Alloy Nanoparticles ◽  
Wide Range

Alloy nanoparticles (NPs), including core-shell, segregated and solid-solution types, show a variety of attractive properties such as catalytic and optical properties and are used in a wide range of applications....

scholarly journals Structural and photoluminescence properties of tin oxide and tin oxide: C core–shell and alloy nanoparticles synthesised using gas phase technique

AIP Advances ◽  
2016 ◽  
Vol 6 (9) ◽  
pp. 095321 ◽  
Author(s):  
Mehar Bhatnagar ◽  
Vishakha Kaushik ◽  
Akshey Kaushal ◽  
Mandeep Singh ◽  
Bodh Raj Mehta
Keyword(s):  
Gas Phase ◽  
Tin Oxide ◽  
Core Shell ◽  
Alloy Nanoparticles ◽  
Photoluminescence Properties

Non-Equilibrium Properties of Au-Pd Nanoparticles

2011 ◽  
Vol 172-174 ◽  
pp. 670-675 ◽  
Author(s):  
Ivailo S. Atanasov ◽  
Marc Hou
Keyword(s):  
Molecular Dynamics ◽  
Low Temperatures ◽  
Pd Nanoparticles ◽  
Core Shell ◽  
Embedded Atom ◽  
Cluster Morphology ◽  
Pd Clusters ◽  
Atom Potential ◽  
The Way

We address the question of the evolution of a nanostructured system in a metastable state to equilibrium. To this purpose, we use the case study of the transition of an AucorePdshell nanoalloy cluster containing up to about 600 atoms toward the equilibrium Au segregated configuration. We start from a molecular dynamics approach with an embedded atom potential. The way the transition develops at low temperatures is found to be very sensitive to the cluster morphology and the way energy is exchanged with the environment. The transition of icosahedral inverse core-shell Au-Pd clusters is predicted to nucleate locally at the surface contrary to clusters with other morphologies, and starting at lower temperatures compared to them.

The synergetic effect of h-BN shells and subsurface B in CoBx@h-BN nanocatalysts for enhanced oxygen evolution reactions

2018 ◽  
Vol 6 (23) ◽  
pp. 10644-10648 ◽  
Author(s):  
Siru Chen ◽  
Yanqiang Li ◽  
Zhihua Zhang ◽  
Qiang Fu ◽  
Xinhe Bao
Keyword(s):  
High Activity ◽  
Oxygen Evolution ◽  
Synergetic Effect ◽  
Core Shell ◽  
Alloy Nanoparticles

CoBx@h-BN core–shell nanocatalysts were prepared via ammonization of Co–B alloy nanoparticles showing high activity and stability in oxygen evolution reactions.

scholarly journals Increasing the Size-Selectivity in Laser-Based g/h Liquid Flow Synthesis of Pt and PtPd Nanoparticles for CO and NO Oxidation in Industrial Automotive Exhaust Gas Treatment Benchmarking

Nanomaterials ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1582 ◽  
Author(s):  
S. Dittrich ◽  
S. Kohsakowski ◽  
B. Wittek ◽  
C. Hengst ◽  
B. Gökce ◽  
...  
Keyword(s):  
Bimetallic Nanoparticles ◽  
Size Fraction ◽  
No Oxidation ◽  
Solid Solution Alloy ◽  
Alloy Nanoparticles ◽  
Exhaust Gas ◽  
Promising Alternative ◽  
Gas Treatment ◽  
Flow Synthesis ◽  
Synthesis Of Nanoparticles

PtPd catalysts are state-of-the-art for automotive diesel exhaust gas treatment. Although wet-chemical preparation of PtPd nanoparticles below 3 nm and kg-scale synthesis of supported PtPd/Al2O3 are already established, the partial segregation of the bimetallic nanoparticles remains an issue that adversely affects catalytic performance. As a promising alternative, laser-based catalyst preparation allows the continuous synthesis of surfactant-free, solid-solution alloy nanoparticles at the g/h-scale. However, the required productivity of the catalytically relevant size fraction <10 nm has yet to be met. In this work, by optimization of ablation and fragmentation conditions, the continuous flow synthesis of nanoparticles with a productivity of the catalytically relevant size fraction <10 nm of >1 g/h is presented via an in-process size tuning strategy. After the laser-based preparation of hectoliters of colloid and more than 2 kg of PtPd/Al2O3 wash coat, the laser-generated catalysts were benchmarked against an industry-relevant reference catalyst. The conversion of CO by laser-generated catalysts was found to be equivalent to the reference, while improved activity during NO oxidation was achieved. Finally, the present study validates that laser-generated catalysts meet the size and productivity requirements for industrial standard operating procedures. Hence, laser-based catalyst synthesis appears to be a promising alternative to chemical-based preparation of alloy nanoparticles for developing industrial catalysts, such as those needed in the treatment of exhaust gases.

PdPt bimetallic nanoparticles enabled by shape control with halide ions and their enhanced catalytic activities

Nanoscale ◽  
2016 ◽  
Vol 8 (7) ◽  
pp. 3962-3972 ◽  
Author(s):  
Jinfeng Zhang ◽  
Lei Wan ◽  
Lei Liu ◽  
Yida Deng ◽  
Cheng Zhong ◽  
...  
Keyword(s):  
Shape Control ◽  
Bimetallic Nanoparticles ◽  
Shell Structures ◽  
Core Shell ◽  
Halide Ions ◽  
Catalytic Activities

The morphologies of PdPt nanoparticles with various core–shell structures could be controlled by altering the participation of different halide ions.

Reversible loss of core–shell structure for Ni–Au bimetallic nanoparticles during CO2 hydrogenation

2020 ◽  
Vol 3 (4) ◽  
pp. 411-417 ◽  
Author(s):  
Xiaoben Zhang ◽  
Shaobo Han ◽  
Beien Zhu ◽  
Guanghui Zhang ◽  
Xiaoyan Li ◽  
...  
Keyword(s):  
Shell Structure ◽  
Bimetallic Nanoparticles ◽  
Co2 Hydrogenation ◽  
Core Shell ◽  
Core Shell Structure ◽  
Reversible Loss

scholarly journals Facile Aqueous-Phase Synthesis of Bimetallic (AgPt, AgPd, and CuPt) and Trimetallic (AgCuPt) Nanoparticles

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 254 ◽  
Author(s):  
Zengmin Tang ◽  
Euiyoung Jung ◽  
Yejin Jang ◽  
Suk Ho Bhang ◽  
Jinheung Kim ◽  
...  
Keyword(s):  
Aqueous Phase ◽  
Metallic Nanoparticles ◽  
Reduction Method ◽  
Bimetallic Nanoparticles ◽  
Atomic Ratio ◽  
Core Shell ◽  
Phase Synthesis ◽  
Short Reaction Time ◽  
Core Shell Structure ◽  
Co Reduction

Multi-metallic nanoparticles continue to attract attention, due to their great potential in various applications. In this paper, we report a facile aqueous-phase synthesis for multi-metallic nanoparticles, including AgPt, AgPd, CuPt, and AgCuPt, by a co-reduction method within a short reaction time of 10 min. The atomic ratio of bimetallic nanoparticles was easily controlled by varying the ratio of each precursor. In addition, we found that AgCuPt trimetallic nanoparticles had a core-shell structure with an Ag core and CuPt shell.

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