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Chepkasov IV, Zamulin IS, Baidyshev VS, Kvashnin AG. Tuning the surface properties of AuPd nanoparticles for adsorption of O and CO. Phys Chem Chem Phys 2023. [PMID: 38037396 DOI: 10.1039/d3cp03213b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2023]
Abstract
Bimetallic nanoparticles are attracting increasing attention as effective catalysts because they can exhibit higher efficiencies than their monometallic counterparts. Recent studies show that PdAu nanoparticles can exhibit truly impressive catalytic activity, due to the synergistic effect of their properties. However, fine-tuning the catalytic activity requires an understanding of the full picture of the processes taking place in bimetallic particles of different compositions and structures. Here we study the influence of the structure and composition of PdAu nanoparticles on their electronic properties, charge distribution and adsorption properties (CO and O) using ab initio calculations. Two types of nanoparticles were considered: core-shell (Pd@Au and Au@Pd) and bimetallic alloy (Au-Pd) with an average diameter of 2 nm (321 atoms), having either fcc, icosahedral or amorphous structures. The results obtained on surface charges show the possibility of fine-tuning the surface properties of nanoparticles by modifying their atomic structure and composition. In addition, the adsorption of O and CO on the surface of PdAu nanoparticles with fcc structure has been studied. The obtained adsorption data correlate with the surface charge redistribution and the d-band center. The results of this study thus open up great prospects for tuning the catalytic properties of nanocatalysts by modifying their local atomic environment.
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Affiliation(s)
- Ilya V Chepkasov
- Skolkovo Institute of Science and Technology, Bolshoy Boulevard 30, bld. 1, Moscow 121205, Russian Federation.
- Katanov Khakas State University, 90 Lenin pr., 655017, Abakan, Russian Federation
| | - Ivan S Zamulin
- Katanov Khakas State University, 90 Lenin pr., 655017, Abakan, Russian Federation
| | - Viktor S Baidyshev
- Skolkovo Institute of Science and Technology, Bolshoy Boulevard 30, bld. 1, Moscow 121205, Russian Federation.
| | - Alexander G Kvashnin
- Skolkovo Institute of Science and Technology, Bolshoy Boulevard 30, bld. 1, Moscow 121205, Russian Federation.
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2
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Nelli D, El Koraychy EY, Cerbelaud M, Crespin B, Videcoq A, Giacomello A, Ferrando R. Two-Steps Versus One-Step Solidification Pathways of Binary Metallic Nanodroplets. ACS NANO 2023; 17:587-596. [PMID: 36537367 PMCID: PMC9836354 DOI: 10.1021/acsnano.2c09741] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Accepted: 12/12/2022] [Indexed: 06/17/2023]
Abstract
The solidification of AgCo, AgNi, and AgCu nanodroplets is studied by molecular dynamics simulations in the size range of 2-8 nm. All these systems tend to phase separate in the bulk solid with surface segregation of Ag. Despite these similarities, the simulations reveal clear differences in the solidification pathways. AgCo and AgNi already separate in the liquid phase, and they solidify in configurations close to equilibrium. They can show a two-step solidification process in which Co-/Ni-rich parts solidify at higher temperatures than the Ag-rich part. AgCu does not separate in the liquid and solidifies in one step, thereby remaining in a kinetically trapped state down to room temperature. The solidification mechanisms and the size dependence of the solidification temperatures are analyzed, finding qualitatively different behaviors in AgCo/AgNi compared to AgCu. These differences are rationalized by an analytical model.
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Affiliation(s)
- Diana Nelli
- Dipartimento
di Fisica, Università di Genova, Via Dodecaneso 33, 16146Genova, Italia
| | - El Yakout El Koraychy
- Dipartimento
di Fisica, Università di Genova, Via Dodecaneso 33, 16146Genova, Italia
| | | | - Benoit Crespin
- Université
de Limoges, CNRS, XLIM/ASALI, F-87000Limoges, France
| | - Arnaud Videcoq
- Université
de Limoges, CNRS, IRCER, UMR 7315, F-87000Limoges, France
| | - Alberto Giacomello
- Dipartimento
di Ingegneria Meccanica e Aerospaziale, Sapienza Università di Roma, via Eudossiana 18, 00184Roma, Italia
| | - Riccardo Ferrando
- Dipartimento
di Fisica, Università di Genova, Via Dodecaneso 33, 16146Genova, Italia
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3
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Xie W, Koyama M. Theoretical design of a technetium-like alloy and its catalytic properties. Chem Sci 2019; 10:5461-5469. [PMID: 31293728 PMCID: PMC6566293 DOI: 10.1039/c9sc00912d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2019] [Accepted: 04/23/2019] [Indexed: 01/28/2023] Open
Abstract
Based on the concept of density of states (DOS) engineering, we theoretically designed a pseudo-Tc material (Mo-Ru alloy) and investigated its electronic structure, phase stability and catalytic activity by using density functional theory. Through comparing the DOS shape, peak distribution, and DOS area differences between Tc and the Mo-Ru alloy, we noticed that bcc-Mo8Ru8 and hcp-Mo8Ru8 had the most similar electronic structures to Tc. The excess energies after entropy correction of hcp-Mo8Ru8 and bcc-Mo8Ru8 are stable when the temperature is up to 765 and 745 K, respectively. These results provided the possibility of pseudo-Tc alloy (hcp-Mo8Ru8 and bcc-Mo8Ru8) synthesis. Finally, according to reaction coordinate analysis, the similar catalytic activity between hcp-Mo8Ru8 and Tc have been demonstrated in CO oxidation and N2 dissociation. In N2 dissociation, Tc has a suitable ratio of transition state (TS) barrier to reaction energy which make Tc an efficient catalyst for NH3 synthesis, in addition to our designed pseudo-Tc (hcp-MoRu) because of the similar electronic structures. Our finding provides valuable insight into materials and catalyst design.
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Affiliation(s)
- Wei Xie
- INAMORI Frontier Research Center , Kyushu University , 744 Motooka, Nishi-ku , Fukuoka , 819-0395 , Japan .
| | - Michihisa Koyama
- INAMORI Frontier Research Center , Kyushu University , 744 Motooka, Nishi-ku , Fukuoka , 819-0395 , Japan .
- Graduate School of Engineering , Hiroshima University , 1-4-1 Kagamiyama, Higashi-Hiroshima , Hiroshima 739-8527 , Japan
- Global Research Center for Environment and Energy Based on Nanomaterials Science , National Institute for Materials Science , 1-1 Namiki , Tsukuba , Ibaraki 305-0044 , Japan .
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Nathanson M, Kanhaiya K, Pryor A, Miao J, Heinz H. Atomic-Scale Structure and Stress Release Mechanism in Core-Shell Nanoparticles. ACS NANO 2018; 12:12296-12304. [PMID: 30457827 DOI: 10.1021/acsnano.8b06118] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Core-shell nanoparticles find applications in catalysts, sensors, and theranostics. The full internal 3D atomic structure, however, cannot be resolved by current imaging and diffraction techniques. We analyzed the atomic positions and stress-release mechanism in a cubic Au-Pd core-shell nanoparticle in approximately 1000 times higher resolution than current experimental techniques using large-scale molecular dynamics simulation to overcome these limitations. The core-shell nanocube of 73 nm size was modeled similarly to solution synthesis by random epitaxial deposition of a 4 nm thick shell of Pd atoms onto a Au core of 65 nm side length using reliable interatomic potentials. The internal structure reveals specific deformations and stress relaxation mechanisms that are caused by the +4.8% lattice mismatch of gold relative to palladium and differential confinement of extended particle facets, edges, and corners by one, two, or three Au-Pd interfaces, respectively. The three-dimensional lattice strain causes long-range, arc-like bending of atomic rows along the faces and edges of the particle, especially near the Au-Pd interface, a bulging deformation of the Pd shell, and stacking faults in the Pd shell at the corners of the particle. The strain pattern and mechanism of stress release were further characterized by profiles of the atomic layer spacing in the principal crystallographic directions. Accordingly, strain in the Pd shell is several times larger in the extended facets than near the edges and corners of the nanoparticle, which likely affects adsorption, optical, and electrochemical properties. The findings are consistent with available experimental data, including 3D reconstructions of the same cubic nanoparticle by coherent diffractive imaging (CDI) and may be verified by more powerful experimental techniques in the future. The stress release mechanisms are representative for cubic core-shell nanoparticles with fcc structure and can be explored for different shapes by the same methods.
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Affiliation(s)
- Michael Nathanson
- Department of Chemical and Biological Engineering , University of Colorado at Boulder , Boulder , Colorado 80309 , United States
| | - Krishan Kanhaiya
- Department of Chemical and Biological Engineering , University of Colorado at Boulder , Boulder , Colorado 80309 , United States
| | - Alan Pryor
- Department of Physics & Astronomy and California NanoSystems Institute , University of California , Los Angeles , California 90095 , United States
| | - Jianwei Miao
- Department of Physics & Astronomy and California NanoSystems Institute , University of California , Los Angeles , California 90095 , United States
| | - Hendrik Heinz
- Department of Chemical and Biological Engineering , University of Colorado at Boulder , Boulder , Colorado 80309 , United States
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5
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Experimental Analysis on the Molten-Phase Dewetting Characteristics of AuPd Alloy Films on Topographically-Structured Substrates. METALS 2017. [DOI: 10.3390/met7090327] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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6
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Xu CQ, Lee MS, Wang YG, Cantu DC, Li J, Glezakou VA, Rousseau R. Structural Rearrangement of Au-Pd Nanoparticles under Reaction Conditions: An ab Initio Molecular Dynamics Study. ACS NANO 2017; 11:1649-1658. [PMID: 28121422 DOI: 10.1021/acsnano.6b07409] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
The structure, composition, and atomic distribution of nanoalloys under operating conditions are of significant importance for their catalytic activity. In the present work, we use ab initio molecular dynamics simulations to understand the structural behavior of Au-Pd nanoalloys supported on rutile TiO2 under different conditions. We find that the Au-Pd structure is strongly dependent on the redox properties of the support, originating from strong metal-support interactions. Under reducing conditions, Pd atoms are inclined to move toward the metal/oxide interface, as indicated by a significant increase of Pd-Ti bonds. This could be attributed to the charge localization at the interface that leads to Coulomb attractions to positively charged Pd atoms. In contrast, under oxidizing conditions, Pd atoms would rather stay inside or on the exterior of the nanoparticle. Moreover, Pd atoms on the alloy surface can be stabilized by hydrogen adsorption, forming Pd-H bonds, which are stronger than Au-H bonds. Our work offers critical insights into the structure and redox properties of Au-Pd nanoalloy catalysts under working conditions.
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Affiliation(s)
- Cong-Qiao Xu
- Department of Chemistry, Tsinghua University , Beijing 100084, China
| | | | | | | | - Jun Li
- Department of Chemistry, Tsinghua University , Beijing 100084, China
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Shakiba A, Shah S, Jamison AC, Rusakova I, Lee TC, Lee TR. Silver-Free Gold Nanocages with Near-Infrared Extinctions. ACS OMEGA 2016; 1:456-463. [PMID: 31457139 PMCID: PMC6640799 DOI: 10.1021/acsomega.6b00134] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2016] [Accepted: 09/05/2016] [Indexed: 06/08/2023]
Abstract
This article reports the preparation of silver-free Au nanocages from cubic palladium templates. Pd nanocubes were subjected to galvanic replacement with Au3+ to produce Pd@Au nanocages having tunable dimensions (i.e., edge length, gold layer thickness, and hollow pore size), which allowed selectable positioning of the optical extinction maxima from the visible to the near infrared. These new nanocages circumvent the problems associated with previous Ag-derived gold alloy nanocages, which suffer from the toxicity of residual silver and the possible fragmentation of such alloyed nanostructures, thereby limiting their potential applications. In contrast, the present materials represent stable, nontoxic, tunable, and hollow plasmonic nanostructures.
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Affiliation(s)
- Amin Shakiba
- Department of Chemistry and The Texas Center for Superconductivity, University of Houston, 4800 Calhoun Road, Houston, Texas 77204, United States
| | - Shreya Shah
- Department of Chemistry and The Texas Center for Superconductivity, University of Houston, 4800 Calhoun Road, Houston, Texas 77204, United States
| | - Andrew C. Jamison
- Department of Chemistry and The Texas Center for Superconductivity, University of Houston, 4800 Calhoun Road, Houston, Texas 77204, United States
| | - Irene Rusakova
- Department of Chemistry and The Texas Center for Superconductivity, University of Houston, 4800 Calhoun Road, Houston, Texas 77204, United States
| | - Tai-Chou Lee
- Department
of Chemical and Materials Engineering, National
Central University, 300
Jhongda Road, Jhongli City 32001, Taiwan
| | - T. Randall Lee
- Department of Chemistry and The Texas Center for Superconductivity, University of Houston, 4800 Calhoun Road, Houston, Texas 77204, United States
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8
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Abstract
To understand the origin of the physicochemical nature of bimetallic PdPt nanoparticles, we theoretically investigated the phase stability and electronic structure employing the PdPt nanoparticles models consisting of 711 atoms (ca. 3 nm). For the Pd-Pt core-shell nanoparticle, the PdPt solid-solution phase was found to be a thermodynamically stable phase in the nanoparticle as the result of difference in surface energy of Pd and Pt nanoparticles and configurational entropy effect, while it is well known that the Pd and Pt are the immiscible combination in the bulk phase. The electronic structure of nanoparticles is conducted to find that the electron transfer occurs locally within surface and subsurface layers. In addition, the electron transfer from Pd to Pt at the interfacial layers in core-shell nanoparticles is observed, which leads to unique geometrical and electronic structure changes. Our results show a clue for the tunability of the electronic structure of nanoparticles by controlling the arrangement in the nanoparticles.
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Affiliation(s)
- Takayoshi Ishimoto
- INAMORI Frontier Research Center, Kyushu University , 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Michihisa Koyama
- INAMORI Frontier Research Center, Kyushu University , 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
- International Institute for Carbon-Neutral Energy Research, Kyushu University , 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
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9
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Akbarzadeh H, Abbaspour M, Khomarian E. Propene adsorption on gold–palladium nanoalloys supported on bundle nanotubes. RSC Adv 2016. [DOI: 10.1039/c6ra12350c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
Propene adsorption on (Pd–Au)N nanoalloys supported on carbon nanotube (CNT) bundles has been investigated using molecular dynamics (MD) simulations at 300 K.
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Affiliation(s)
- Hamed Akbarzadeh
- Department of Chemistry
- Faculty of Basic Sciences
- Hakim Sabzevari University
- 96179-76487 Sabzevar
- Iran
| | - Mohsen Abbaspour
- Department of Chemistry
- Faculty of Basic Sciences
- Hakim Sabzevari University
- 96179-76487 Sabzevar
- Iran
| | - Elham Khomarian
- Department of Chemistry
- Faculty of Basic Sciences
- Hakim Sabzevari University
- 96179-76487 Sabzevar
- Iran
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10
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Davies RJ, Bowker M, Davies PR, Morgan DJ. A facile route to model catalysts: the synthesis of Au@Pd core-shell nanoparticles on γ-Fe₂O₃ (0001). NANOSCALE 2013; 5:9018-9022. [PMID: 23913196 DOI: 10.1039/c3nr03047d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
A straightforward method of synthesising Au@Pd core-shell particles on a well characterised γ-Fe₂O₃ (0001) substrate has been developed which will enable fundamental studies into the surface chemistry of these catalytically interesting systems. Au and Pd were sequentially deposited onto a γ-Fe₂O₃ (0001) substrate in ultra high vacuum by metal vapour deposition and probed by LEIS and STM. Deposition of Au followed by heating at 573 K formed nanoparticles of 5 to 10 nm in diameter whereas subsequent deposition of Pd produced smaller nanoparticles of 2 to 4 nm diameter. At this stage, LEIS shows both metals to be present but heating the combined system to 573 K resulted in the loss of the Au signal in the LEIS and disappearance of the smaller particles from the STM images indicating the formation of Au@Pd core-shell structures.
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Affiliation(s)
- Robert J Davies
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Cardiff, CF10 3AT, UK.
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11
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Liu X, Tian D, Meng C. DFT study on stability and H2 adsorption activity of bimetallic Au79−nPdn (n=1–55) clusters. Chem Phys 2013. [DOI: 10.1016/j.chemphys.2013.01.014] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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12
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Pretzer LA, Song HJ, Fang YL, Zhao Z, Guo N, Wu T, Arslan I, Miller JT, Wong MS. Hydrodechlorination catalysis of Pd-on-Au nanoparticles varies with particle size. J Catal 2013. [DOI: 10.1016/j.jcat.2012.11.005] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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13
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Fernández-Navarro C, Mejía-Rosales S. Molecular Dynamics of Free and Graphite-Supported Pt-Pd Nanoparticles. ACTA ACUST UNITED AC 2013. [DOI: 10.4236/anp.2013.24044] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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14
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DFT study on stability and structure of bimetallic AumPdn (N=38, 55, 79, N=m+n, m/n≈2:1 and 5:1) clusters. COMPUT THEOR CHEM 2012. [DOI: 10.1016/j.comptc.2012.09.012] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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15
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Villarreal MA, Oviedo OA, Leiva EPM. A Straightforward Approach for the Determination of the Maximum Time Step for the Simulation of Nanometric Metallic Systems. J Chem Theory Comput 2012; 8:1744-9. [DOI: 10.1021/ct300069d] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Marcos A. Villarreal
- INFIQC, CONICET, Departamento de Matemática
y Física, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba,
Argentina, X5000HUA
| | - Oscar A. Oviedo
- INFIQC, CONICET, Departamento de Matemática
y Física, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba,
Argentina, X5000HUA
| | - Ezequiel P. M. Leiva
- INFIQC, CONICET, Departamento de Matemática
y Física, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba,
Argentina, X5000HUA
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Tran DT, Jones IP, Preece JA, Johnston RL, Deplanche K, Macaskie LE. Configuration of microbially synthesized Pd-Au nanoparticles studied by STEM-based techniques. NANOTECHNOLOGY 2012; 23:055701. [PMID: 22236722 DOI: 10.1088/0957-4484/23/5/055701] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Bimetallic Pd-Au particles synthesized using Desulfovibrio desulfuricans bacteria are characterized using scanning transmission electron microscopy (STEM) with a high-angle annular dark field (HAADF) detector combined with energy dispersive x-ray (EDX) silicon drift detector (SDD) elemental mapping and plasmon electron energy-loss spectroscopy (EELS). When combined with EDX, theoretical considerations or EELS, the atomic-number contrast (Z-contrast) provided by HAADF-STEM is effective in characterizing the compositional configuration of the bimetallic nanoparticles. Homogeneous mixing and complex segregations have been found for different particles in this work. The EELS study has also found different behaviours corresponding to surface plasmon resonances in different regions of a single particle due to its heterogeneity and anisotropy. HAADF-STEM tomography has been performed to obtain three-dimensional (3D) visualization of the nanoparticles.
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Affiliation(s)
- D T Tran
- School of Metallurgy and Materials, University of Birmingham, Birmingham B15 2TT, UK
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Sandoval A, Aguilar A, Louis C, Traverse A, Zanella R. Bimetallic Au–Ag/TiO2 catalyst prepared by deposition–precipitation: High activity and stability in CO oxidation. J Catal 2011. [DOI: 10.1016/j.jcat.2011.04.003] [Citation(s) in RCA: 138] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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19
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Ding Y, Fan F, Tian Z, Wang ZL. Atomic Structure of Au−Pd Bimetallic Alloyed Nanoparticles. J Am Chem Soc 2010; 132:12480-6. [DOI: 10.1021/ja105614q] [Citation(s) in RCA: 205] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yong Ding
- School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, and Department of Chemistry, Xiamen University, Xiamen 361005, China
| | - Fengru Fan
- School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, and Department of Chemistry, Xiamen University, Xiamen 361005, China
| | - Zhongqun Tian
- School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, and Department of Chemistry, Xiamen University, Xiamen 361005, China
| | - Zhong Lin Wang
- School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, and Department of Chemistry, Xiamen University, Xiamen 361005, China
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Weir MG, Knecht MR, Frenkel AI, Crooks RM. Structural analysis of PdAu dendrimer-encapsulated bimetallic nanoparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:1137-1146. [PMID: 19839631 DOI: 10.1021/la902233h] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
PdAu dendrimer-encapsulated nanoparticles (DENs) were prepared via sequential reduction of the component metals. When Au is reduced onto 55-atom, preformed Pd DEN cores, analysis by UV-vis spectroscopy, electron microscopy, and extended X-ray absorption fine structure (EXAFS) spectroscopy leads to a model consistent with inversion of the two metals. That is, Au migrates into the core and Pd resides on the surface. However, when Pd is reduced onto a 55-atom Au core, the expected Au core-Pd shell structure results. In this latter case, the EXAFS analysis suggests partial oxidation of the relatively thick Pd shell. When the DENs are extracted from their protective dendrimer stabilizers by alkylthiols, the resulting monolayer-protected clusters retain their original Au core-Pd shell structures. The structural analysis is consistent with a study of nanoparticle-catalyzed conversion of resazurin to resorufin. The key conclusion from this work is that correlation of structure to catalytic function for very small, bimetallic nanoparticles requires detailed information about atomic configuration.
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Affiliation(s)
- Michael G Weir
- Department of Chemistry and Biochemistry, Texas Materials Institute, Center for Nano- and Molecular Science and Technology, The University of Texas at Austin, 1 University Station, A5300, Austin, Texas 78712-0165, USA
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21
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Yudanov IV, Neyman KM. Stabilization of Au at edges of bimetallic PdAu nanocrystallites. Phys Chem Chem Phys 2010; 12:5094-100. [DOI: 10.1039/b927048e] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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22
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Ismail R, Johnston RL. Investigation of the structures and chemical ordering of small Pd–Au clusters as a function of composition and potential parameterisation. Phys Chem Chem Phys 2010; 12:8607-19. [DOI: 10.1039/c004044d] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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23
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Yang Z, Yang X, Xu Z, Liu S. Structural evolution of Pt–Au nanoalloys during heating process: comparison of random and core-shell orderings. Phys Chem Chem Phys 2009; 11:6249-55. [DOI: 10.1039/b821328c] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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24
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Hristova E, Dong Y, Grigoryan VG, Springborg M. Structural and Energetic Properties of Ni−Cu Bimetallic Clusters. J Phys Chem A 2008; 112:7905-15. [DOI: 10.1021/jp801837d] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Elisaveta Hristova
- Physical and Theoretical Chemistry, University of Saarland, 66123 Saarbrücken, Germany
| | - Yi Dong
- Physical and Theoretical Chemistry, University of Saarland, 66123 Saarbrücken, Germany
| | - Valeri G. Grigoryan
- Physical and Theoretical Chemistry, University of Saarland, 66123 Saarbrücken, Germany
| | - Michael Springborg
- Physical and Theoretical Chemistry, University of Saarland, 66123 Saarbrücken, Germany
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25
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Peng Z, Yang H. Ag–Pt alloy nanoparticles with the compositions in the miscibility gap. J SOLID STATE CHEM 2008. [DOI: 10.1016/j.jssc.2008.03.013] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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26
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Hristova E, Grigoryan VG, Springborg M. Structure and energetics of equiatomic K–Cs and Rb–Cs binary clusters. J Chem Phys 2008; 128:244513. [DOI: 10.1063/1.2944244] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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27
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Ferrando R, Jellinek J, Johnston RL. Nanoalloys: From Theory to Applications of Alloy Clusters and Nanoparticles. Chem Rev 2008; 108:845-910. [PMID: 18335972 DOI: 10.1021/cr040090g] [Citation(s) in RCA: 1716] [Impact Index Per Article: 107.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Riccardo Ferrando
- Dipartimento di Fisica, Universita di Genova, INFM and IMEM/CNR, Via Dodecaneso 33, Genova, I16146, Italy, Chemistry Division, Argonne National Laboratory, Argonne, Illinois 60439, and School of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom
| | - Julius Jellinek
- Dipartimento di Fisica, Universita di Genova, INFM and IMEM/CNR, Via Dodecaneso 33, Genova, I16146, Italy, Chemistry Division, Argonne National Laboratory, Argonne, Illinois 60439, and School of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom
| | - Roy L. Johnston
- Dipartimento di Fisica, Universita di Genova, INFM and IMEM/CNR, Via Dodecaneso 33, Genova, I16146, Italy, Chemistry Division, Argonne National Laboratory, Argonne, Illinois 60439, and School of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom
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Cheng D, Wang W, Huang S. Melting phenomena: effect of composition for 55-atom Ag–Pd bimetallic clusters. Phys Chem Chem Phys 2008; 10:2513-8. [DOI: 10.1039/b800630j] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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29
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Mejía-Rosales SJ, Fernandez-Navarro C, Pérez-Tijerina E, Montejano-Carrizales JM, José-Yacamán M. Two-stage melting of Au-Pd nanoparticles. J Phys Chem B 2006. [PMID: 16805586 DOI: 10.1021/jp066328h] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/16/2023]
Abstract
Several series of molecular dynamics runs were performed to simulate the melting transition of bimetallic cuboctahedral nanoparticles of gold-palladium at different relative concentrations to study their structural properties before, in, and after the transition. The simulations were made in the canonical ensemble, each series covering a range of temperatures from 300 to 980 K, using the Rafii-Tabar version of the Sutton and Chen interatomic potential for metallic alloys. We found that the melting transition temperature has a strong dependence on the relative concentrations of the atomic species. We also found that, previous to the melting transition, the outer layer of the nanoparticle gets disordered in what can be thought as a premelting stage, where Au atoms near the surface migrate to the surface and remain there after the particle melts as a whole. The melting of the surface below Tm is consistent with studies of the interaction of a TEM electron beam with Au and Au-Pd nanoparticles.
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Affiliation(s)
- Sergio J Mejía-Rosales
- Facultad de Ciencias Físico-Matematicas, Universidad Autónoma de Nuevo León, San Nicolas de los Garza, Nuevo León, México 66450
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30
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Liu HB, Canizal G, Schabes-Retchkiman PS, Ascencio JA. Structural Selection and Amorphization of Small Ni−Ti Bimetallic Clusters. J Phys Chem B 2006; 110:12333-9. [PMID: 16800556 DOI: 10.1021/jp061856e] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Classical molecular dynamics simulation is used for structural thermodynamic analysis of Ni-Ti bimetallic clusters. Experimental observation for the nanoclusters synthesized by the bioreduction method is used to consolidate the conclusion. The results demonstrate that Ni-Ti nanoclusters as small as 2-3 nm are not energetically favorable for common ordered geometrical arrangements such as cuboctahedron, decahedron, and icosahedron, though they can be synthesized experimentally. For the elemental distribution, Ni and Ti tend to aggregate separately. In the cases under study, eutectic-like and Ni-core/Ti-shell structures can keep their basic shape and elemental distribution during long periods of relaxation at room temperature. For other cases such as solid solution and Ti-core/Ni-shell, the structures amorphized and the elements tend to distribute uniformly even though they are at temperatures as low as room temperature. Experimental evidence was obtained by the analysis of biosynthesized nanoparticles using transmission electron microscopy techniques. This allowed determination of the partial amorphized structures of small bimetallic particles with cubic and multiple twined-like structures.
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Affiliation(s)
- H B Liu
- Programa de Investigación en Ductos, Corrosion y Materiales, Instituto Mexicano del Petroleo, Eje Central Lazaro Cardenas 152, Col. San Bartolo Atepehuacan, C.P. 07730, Mexico DF, Mexico
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