1
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Focassio B, Fiuza TER, Bettini J, Schleder GR, Rodrigues MHM, Souza Junior JB, Leite ER, Fazzio A, Capaz RB. Stability and Rupture of an Ultrathin Ionic Wire. PHYSICAL REVIEW LETTERS 2022; 129:046101. [PMID: 35939018 DOI: 10.1103/physrevlett.129.046101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Accepted: 06/28/2022] [Indexed: 06/15/2023]
Abstract
Using a combination of in situ high-resolution transmission electron microscopy and density functional theory, we report the formation and rupture of ZrO_{2} atomic ionic wires. Near rupture, under tensile stress, the system favors the spontaneous formation of oxygen vacancies, a critical step in the formation of the monatomic bridge. In this length scale, vacancies provide ductilelike behavior, an unexpected mechanical behavior for ionic systems. Our results add an ionic compound to the very selective list of materials that can form monatomic wires and they contribute to the fundamental understanding of the mechanical properties of ceramic materials at the nanoscale.
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Affiliation(s)
- Bruno Focassio
- Federal University of ABC (UFABC), 09210-580 Santo André, São Paulo, Brazil
- Ilum School of Science, CNPEM, 13083-970 Campinas, São Paulo, Brazil
| | - Tanna E R Fiuza
- Brazilian Nanotechnology National Laboratory (LNNano), CNPEM, 13083-970 Campinas, São Paulo, Brazil
| | - Jefferson Bettini
- Brazilian Nanotechnology National Laboratory (LNNano), CNPEM, 13083-970 Campinas, São Paulo, Brazil
| | - Gabriel R Schleder
- Federal University of ABC (UFABC), 09210-580 Santo André, São Paulo, Brazil
- Brazilian Nanotechnology National Laboratory (LNNano), CNPEM, 13083-970 Campinas, São Paulo, Brazil
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA
| | - Murillo H M Rodrigues
- Departamento de Química, Universidade Federal de São Carlos, 13565-905 São Carlos, São Paulo, Brazil
| | - João B Souza Junior
- Brazilian Nanotechnology National Laboratory (LNNano), CNPEM, 13083-970 Campinas, São Paulo, Brazil
| | - Edson R Leite
- Brazilian Nanotechnology National Laboratory (LNNano), CNPEM, 13083-970 Campinas, São Paulo, Brazil
- Departamento de Química, Universidade Federal de São Carlos, 13565-905 São Carlos, São Paulo, Brazil
| | - Adalberto Fazzio
- Federal University of ABC (UFABC), 09210-580 Santo André, São Paulo, Brazil
- Ilum School of Science, CNPEM, 13083-970 Campinas, São Paulo, Brazil
| | - Rodrigo B Capaz
- Brazilian Nanotechnology National Laboratory (LNNano), CNPEM, 13083-970 Campinas, São Paulo, Brazil
- Instituto de Física, Universidade Federal do Rio de Janeiro, 21941-909 Rio de Janeiro, Rio de Janeiro, Brazil
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2
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Yan B, He Y, Yang G. Nanoscale Self-Wetting Driven Monatomization of Ag Nanoparticle for Excellent Photocatalytic Hydrogen Evolution. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 18:e2107840. [PMID: 35199465 DOI: 10.1002/smll.202107840] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Revised: 01/19/2022] [Indexed: 06/14/2023]
Abstract
Metal nanoparticles (NPs) with <10 nm have demonstrated many novel applications including surprisingly low melting point, astonishing liquid-like pseudoelasticity, and outstanding hydrogen evolution performance. Here, a nanoscale self-wetting driven monatomization of Ag NPs with <5 nm on carbon nitride (CN) to fabricate Ag single-atom catalyst (Ag1 /CN SAC) is demonstrated, and a thermodynamic approach to elucidate Ag NPs decomposing into single atoms is established. Dynamic dispersion process of Ag NPs into atoms on CN is recorded using in situ AC-HADDF-TEM techniques. Density functional theory calculations and molecular dynamics simulations suggest that the spontaneous dispersion origins from the nanoscale self-wetting effect in thermodynamics. In atomic scale, the driving force of self-wetting derived from the balance between cohesive energy of Ag NPs and excess energy of Ag atoms in CN vacations. The fabricated Ag1 /CN SAC proved a higher efficiency for photocatalytic hydrogen evolution activity (3690 μmmol g-1 h-1 ) than Pt nanoparticles on CN (3192 μmmol g-1 h-1 ). This spontaneous monatomization resulting from the interaction between metal NPs and substrate provides a simple method to prepare SACs with a high active photocatalytic hydrogen evolution.
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Affiliation(s)
- Bo Yan
- State Key Laboratory of Optoelectronic Materials and Technologies, Nanotechnology Research Center, School of Physics, School of Materials Science & Engineering, Sun Yat-sen University, Guangzhou, Guangdong, 510275, P. R. China
| | - Yan He
- College of Science, Guangdong University of Petrochemical Technology, Maoming, Guangdong, 525000, P. R. China
| | - Guowei Yang
- State Key Laboratory of Optoelectronic Materials and Technologies, Nanotechnology Research Center, School of Physics, School of Materials Science & Engineering, Sun Yat-sen University, Guangzhou, Guangdong, 510275, P. R. China
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3
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Wang M, Hu K, Zuo Z, Hu S, Lu S. Facet-Guiding Deposition of Size-Selected Au Cluster Size on MgO Cube. J CLUST SCI 2021. [DOI: 10.1007/s10876-021-02022-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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4
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Casey-Stevens CA, Yang M, Weal GR, McIntyre SM, Nally BK, Garden AL. A theoretical investigation of 38-atom CuPd clusters: the effect of potential parameterisation on structure and segregation. Phys Chem Chem Phys 2021; 23:15950-15964. [PMID: 34308938 DOI: 10.1039/d1cp00810b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Understanding the structure of bimetallic clusters is increasingly important due to their emerging practical applications. Herein we investigate the structure of 38-atom CuPd clusters using a genetic algorithm with cluster energies described by the semi-empirical Gupta potential. Selected clusters are then refined with density functional theory. Three different parameterisations of the Gupta potential are used and their performance assessed to understand what features of bulk and surfaces are necessary to capture for accurate description of small clusters. Three general regions of motif stability exist; for the Pd majority clusters (Pd38 to Cu4Pd34) the truncated octahedron is most stable, while for clusters of intermediate compositions (Cu5Pd33 to Cu25Pd13) a "pancake" icosahedron is most stable, and for the Cu majority clusters (Cu26Pd12 to Cu38) again the truncated octahedron is most stable. CuPd clusters tend to segregate to a Cu-core, Pd-shell structure if possible, and at higher Cu compositions, the Pd segregates to the faces of the cluster. Using multiple parameterisations of the Gupta potential ensures the full variety of possible structures is found, and improves the search for the most stable CuPd clusters.
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5
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Lu S, Hu K, Zuo Z, Hu S, Wang G, Song F, Cao L. Beam generation and structural optimization of size-selected Au 923 clusters. NANOSCALE ADVANCES 2020; 2:2720-2725. [PMID: 36132384 PMCID: PMC9418728 DOI: 10.1039/d0na00304b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Accepted: 05/18/2020] [Indexed: 06/15/2023]
Abstract
A size-selected beam of Au923±20 clusters is generated in a gas-phase condensation cluster source equipped with a lateral time-of-flight mass selector. The beam current reaches up to 9.13 nA for small clusters and 80 pA for Au923±20 clusters, which are then analyzed using a scanning transmission electron microscope. Four types of metastable structures are observed for the Au923±20 clusters, including ino-decahedron (Dh), cuboctahedron and icosahedron (Ih). The proportion of bulk-favorable cuboctahedron (i.e. face center cubic (Fcc)) structure takes up only 10-20%, while the penta-rotating symmetrical structures (Dh/Ih) are the dominant ones which take up over three quarters. Changing the beam condition may optimize the clusters from Dh-dominant to the Ih-dominant phase, which paves the way towards nanoparticle control beyond the diameters.
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Affiliation(s)
- Siqi Lu
- National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, School of Physics, Nanjing University Nanjing 210093 China
- Atomic Manufacture Institute (AMI) 211805 Nanjing China
| | - Kuojuei Hu
- National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, School of Physics, Nanjing University Nanjing 210093 China
- Atomic Manufacture Institute (AMI) 211805 Nanjing China
| | - Zewen Zuo
- National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, School of Physics, Nanjing University Nanjing 210093 China
- Atomic Manufacture Institute (AMI) 211805 Nanjing China
| | - Shengyong Hu
- National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, School of Physics, Nanjing University Nanjing 210093 China
- Atomic Manufacture Institute (AMI) 211805 Nanjing China
| | - Guanghou Wang
- National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, School of Physics, Nanjing University Nanjing 210093 China
- Atomic Manufacture Institute (AMI) 211805 Nanjing China
| | - Fengqi Song
- National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, School of Physics, Nanjing University Nanjing 210093 China
- Atomic Manufacture Institute (AMI) 211805 Nanjing China
| | - Lu Cao
- National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, School of Physics, Nanjing University Nanjing 210093 China
- Atomic Manufacture Institute (AMI) 211805 Nanjing China
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6
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De Wael A, De Backer A, Jones L, Varambhia A, Nellist PD, Van Aert S. Measuring Dynamic Structural Changes of Nanoparticles at the Atomic Scale Using Scanning Transmission Electron Microscopy. PHYSICAL REVIEW LETTERS 2020; 124:106105. [PMID: 32216442 DOI: 10.1103/physrevlett.124.106105] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2019] [Accepted: 01/30/2020] [Indexed: 06/10/2023]
Abstract
We propose a new method to measure atomic scale dynamics of nanoparticles from experimental high-resolution annular dark field scanning transmission electron microscopy images. By using the so-called hidden Markov model, which explicitly models the possibility of structural changes, the number of atoms in each atomic column can be quantified over time. This newly proposed method outperforms the current atom-counting procedure and enables the determination of the probabilities and cross sections for surface diffusion. This method is therefore of great importance for revealing and quantifying the atomic structure when it evolves over time via adatom dynamics, surface diffusion, beam effects, or during in situ experiments.
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Affiliation(s)
- Annelies De Wael
- EMAT, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium
- NANOlab Center of Excellence, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium
| | - Annick De Backer
- EMAT, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium
- NANOlab Center of Excellence, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium
| | - Lewys Jones
- Department of Materials, University of Oxford, Parks Road, OX1 3PH Oxford, United Kingdom
- Advanced Microscopy Laboratory, Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN), Dublin 2, Ireland
- School of Physics, Trinity College Dublin, The University of Dublin, Dublin 2, Ireland
| | - Aakash Varambhia
- Department of Materials, University of Oxford, Parks Road, OX1 3PH Oxford, United Kingdom
| | - Peter D Nellist
- Department of Materials, University of Oxford, Parks Road, OX1 3PH Oxford, United Kingdom
| | - Sandra Van Aert
- EMAT, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium
- NANOlab Center of Excellence, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium
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7
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Lambie SG, Weal GR, Blackmore CE, Palmer RE, Garden AL. Contrasting motif preferences of platinum and gold nanoclusters between 55 and 309 atoms. NANOSCALE ADVANCES 2019; 1:2416-2425. [PMID: 36131985 PMCID: PMC9419228 DOI: 10.1039/c9na00122k] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2019] [Accepted: 04/26/2019] [Indexed: 06/10/2023]
Abstract
The atomic structure of size-selected Pt clusters in the range 10-600 atoms is investigated with aberration-corrected scanning transmission electron microscopy and reveals significantly different behaviour from the existing data for Au clusters. The Pt clusters show a dominance of the FCC motif from relatively small sizes, whereas traditionally for Au multiple motifs - the icosahedron, decahedron and FCC motifs (and related structures) compete. The new data motivates a comprehensive computational investigation to better understand similarities and differences in the structures and energetics of the two different metallic clusters. Low energy structures of Pt and Au clusters with 55, 101, 147, 228 and 309 atoms (±2%) are identified using a global optimisation algorithm, and the relative energies found by local minimisation using density functional theory. Our computational results support the experimental observations; for Au clusters all motifs are comparably stable over the whole size range, whereas for Pt, the motifs only compete at the smallest sizes, after which the FCC motif is the most stable. Structural analysis suggests the greater tendency of Au towards amorphisation enables the icosahedron and decahedron to remain competitive at larger sizes.
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Affiliation(s)
- Stephanie G Lambie
- Department of Chemistry, University of Otago P.O. Box 56 Dunedin 9054 New Zealand +64 3 479 7906 +64 3 479 7928
| | - Geoffrey R Weal
- Department of Chemistry, University of Otago P.O. Box 56 Dunedin 9054 New Zealand +64 3 479 7906 +64 3 479 7928
| | - Caroline E Blackmore
- Nanoscale Physics Research Laboratory, School of Physics and Astronomy, University of Birmingham Birmingham B15 2TT UK
- School of Chemical Engineering, University of Birmingham Birmingham B15 2TT UK
| | - Richard E Palmer
- College of Engineering, Swansea University, Bay Campus Fabian Way Swansea SA1 8EN UK
| | - Anna L Garden
- Department of Chemistry, University of Otago P.O. Box 56 Dunedin 9054 New Zealand +64 3 479 7906 +64 3 479 7928
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8
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Liu ZH, Chen X, Zhu YY, Zhao SH, Wang ZQ, Wang F, Meng QQ, Zhu L, Zhang QF, Wang BL, Fan LL. Well dispersed SnO 2 nanoclusters preparation and modulation of metal-insulator transition induced by ionic liquid. CHINESE J CHEM PHYS 2019. [DOI: 10.1063/1674-0068/cjcp1903049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Affiliation(s)
- Zhong-hu Liu
- Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province, Yancheng Institute of Technology, Yancheng 224051, China
| | - Xing Chen
- Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province, Yancheng Institute of Technology, Yancheng 224051, China
| | - Yi-yu Zhu
- Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province, Yancheng Institute of Technology, Yancheng 224051, China
| | - Si-han Zhao
- Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province, Yancheng Institute of Technology, Yancheng 224051, China
| | - Zhi-qiang Wang
- Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province, Yancheng Institute of Technology, Yancheng 224051, China
| | - Feng Wang
- Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province, Yancheng Institute of Technology, Yancheng 224051, China
| | - Qiang-qiang Meng
- Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province, Yancheng Institute of Technology, Yancheng 224051, China
| | - Lei Zhu
- Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province, Yancheng Institute of Technology, Yancheng 224051, China
| | - Qin-fang Zhang
- School of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, China
| | - Bao-lin Wang
- School of Physical Science and Technology, Nanjing Normal University, Nanjing 210023, China
| | - Le-le Fan
- Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province, Yancheng Institute of Technology, Yancheng 224051, China
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9
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Garden AL, Pedersen A, Jónsson H. Reassignment of 'magic numbers' for Au clusters of decahedral and FCC structural motifs. NANOSCALE 2018; 10:5124-5132. [PMID: 29488526 DOI: 10.1039/c7nr09440j] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Calculations of low free energy structures of gold clusters with a few hundred to a few thousand atoms have been performed. For the study to be computationally feasible, a systematic scheme for generating low energy atomic structures with a given structural motif and a chosen size is used. Comparison of the relative stability of clusters with the decahedral and FCC motifs reveals periodic windows of stability for asymmetric, open-shell FCC clusters while the stability of the decahedral structural motif shows a smoother variation in stability with cluster size. As a result, the FCC structural motif is most stable for clusters with around 440, 610, 800, 1050… atoms, while the decahedral motif is more stable for atomic numbers of around 525, 705, 925, 1175… These new 'magic numbers' represent regions around which a number of asymmetric, open shell clusters of a given motif are most stable, in contrast to the discrete set of highly symmetric magic size structures that are commonly cited. As temperature is raised, the decahedral motif gains stability over the FCC motif. These results help explain reported experimental observations and can guide future laboratory preparations of shape selected clusters.
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Affiliation(s)
- Anna L Garden
- Department of Chemistry, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand
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10
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Palmer RE, Cao L, Yin F. Note: Proof of principle of a new type of cluster beam source with potential for scale-up. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2016; 87:046103. [PMID: 27131719 DOI: 10.1063/1.4947229] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We introduce a new type of cluster beam source based on the assembly of (metal) clusters within a condensed (rare gas) matrix. The "Matrix Assembly Cluster Source" employs an ion beam to enhance collisions between metal atoms in the matrix and to sputter out clusters to form a beam. We demonstrate the formation and deposition of gold and silver nanoclusters with mean size tunable from a few atoms to a few thousand atoms. The cluster flux is equivalent to a current nanoAmp regime but potentially scalable to milliAmps, which would open up a number of interesting experiments and applications.
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Affiliation(s)
- R E Palmer
- Nanoscale Physics Research Laboratory, School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - L Cao
- Nanoscale Physics Research Laboratory, School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - F Yin
- Nanoscale Physics Research Laboratory, School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, United Kingdom
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11
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Hu KJ, Plant SR, Ellis PR, Brown CM, Bishop PT, Palmer RE. Atomic Resolution Observation of a Size-Dependent Change in the Ripening Modes of Mass-Selected Au Nanoclusters Involved in CO Oxidation. J Am Chem Soc 2015; 137:15161-8. [DOI: 10.1021/jacs.5b08720] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Kuo-Juei Hu
- Nanoscale
Physics Research Laboratory, School of Physics and Astronomy, University of Birmingham, Birmingham, B15 2TT, U.K
| | - Simon R. Plant
- Nanoscale
Physics Research Laboratory, School of Physics and Astronomy, University of Birmingham, Birmingham, B15 2TT, U.K
| | - Peter R. Ellis
- Johnson Matthey Technology Centre, Blounts Court Road, Sonning Common, Reading, RG4 9NH, U.K
| | - Christopher M. Brown
- Johnson Matthey Technology Centre, Blounts Court Road, Sonning Common, Reading, RG4 9NH, U.K
| | - Peter T. Bishop
- Johnson Matthey Technology Centre, Blounts Court Road, Sonning Common, Reading, RG4 9NH, U.K
| | - Richard E. Palmer
- Nanoscale
Physics Research Laboratory, School of Physics and Astronomy, University of Birmingham, Birmingham, B15 2TT, U.K
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12
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Wright LB, Palafox-Hernandez JP, Rodger PM, Corni S, Walsh TR. Facet selectivity in gold binding peptides: exploiting interfacial water structure. Chem Sci 2015; 6:5204-5214. [PMID: 29449926 PMCID: PMC5669244 DOI: 10.1039/c5sc00399g] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2015] [Accepted: 06/20/2015] [Indexed: 11/21/2022] Open
Abstract
Peptide sequences that can discriminate between gold facets under aqueous conditions offer a promising route to control the growth and organisation of biomimetically-synthesised gold nanoparticles. Knowledge of the interplay between sequence, conformations and interfacial properties is essential for predictable manipulation of these biointerfaces, but the structural connections between a given peptide sequence and its binding affinity remain unclear, impeding practical advances in the field. These structural insights, at atomic-scale resolution, are not easily accessed with experimental approaches, but can be delivered via molecular simulation. A current unmet challenge lies in forging links between predicted adsorption free energies derived from enhanced sampling simulations with the conformational ensemble of the peptide and the water structure at the surface. To meet this challenge, here we use an in situ combination of Replica Exchange with Solute Tempering with Metadynamics simulations to predict the adsorption free energy of a gold-binding peptide sequence, AuBP1, at the aqueous Au(111), Au(100)(1 × 1) and Au(100)(5 × 1) interfaces. We find adsorption to the Au(111) surface is stronger than to Au(100), irrespective of the reconstruction status of the latter. Our predicted free energies agree with experiment, and correlate with trends in interfacial water structuring. For gold, surface hydration is predicted as a chief determining factor in peptide-surface recognition. Our findings can be used to suggest how shaped seed-nanocrystals of Au, in partnership with AuBP1, could be used to control AuNP nanoparticle morphology.
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Affiliation(s)
- Louise B Wright
- Dept. of Chemistry , University of Warwick , Coventry , CV4 7AL , UK
| | | | - P Mark Rodger
- Dept. of Chemistry , University of Warwick , Coventry , CV4 7AL , UK
- Centre for Scientific Computing , University of Warwick , Coventry , CV4 7AL , UK .
| | - Stefano Corni
- Centro S3 CNR Istituto Nanoscienze , Modena , Italy .
| | - Tiffany R Walsh
- Institute for Frontier Materials , Deakin University , Geelong , 3216 , VIC , Australia .
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13
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Rogers SM, Catlow CRA, Chan-Thaw CE, Gianolio D, Gibson EK, Gould AL, Jian N, Logsdail AJ, Palmer RE, Prati L, Dimitratos N, Villa A, Wells PP. Tailoring Gold Nanoparticle Characteristics and the Impact on Aqueous-Phase Oxidation of Glycerol. ACS Catal 2015. [DOI: 10.1021/acscatal.5b00754] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Scott M. Rogers
- UK Catalysis Hub,
Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell Oxon, Didcot, OX11 0FA, United Kingdom
- Department
of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
| | - C. Richard A. Catlow
- UK Catalysis Hub,
Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell Oxon, Didcot, OX11 0FA, United Kingdom
- Department
of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
| | - Carine E. Chan-Thaw
- Dipartimento
di Chimica, Università degli Studi di Milano, via Golgi
19, 20133 Milano, Italy
| | - Diego Gianolio
- Diamond Light
Source Ltd, Harwell Science and Innovation
Campus, Chilton, Didcot OX11 0DE, United Kingdom
| | - Emma K. Gibson
- UK Catalysis Hub,
Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell Oxon, Didcot, OX11 0FA, United Kingdom
- Department
of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
| | - Anna L. Gould
- UK Catalysis Hub,
Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell Oxon, Didcot, OX11 0FA, United Kingdom
- Department
of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
| | - Nan Jian
- Nanoscale
Physics Research Laboratory, School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom
| | - Andrew J. Logsdail
- Department
of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
| | - Richard E. Palmer
- Nanoscale
Physics Research Laboratory, School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom
| | - Laura Prati
- Dipartimento
di Chimica, Università degli Studi di Milano, via Golgi
19, 20133 Milano, Italy
| | - Nikolaos Dimitratos
- UK Catalysis Hub,
Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell Oxon, Didcot, OX11 0FA, United Kingdom
- Cardiff Catalysis
Institute, School of Chemistry, Cardiff University, Cardiff, CF10 3AT, United Kingdom
| | - Alberto Villa
- Dipartimento
di Chimica, Università degli Studi di Milano, via Golgi
19, 20133 Milano, Italy
| | - Peter P. Wells
- UK Catalysis Hub,
Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell Oxon, Didcot, OX11 0FA, United Kingdom
- Department
of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
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14
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Jian N, Stapelfeldt C, Hu KJ, Fröba M, Palmer RE. Hybrid atomic structure of the Schmid cluster Au55(PPh3)12Cl6 resolved by aberration-corrected STEM. NANOSCALE 2015; 7:885-8. [PMID: 25463773 DOI: 10.1039/c4nr06059h] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
We have investigated the atomic structure of the Au55(PPh3)12Cl6 Schmid cluster by using aberration-corrected scanning transmission electron microscopy (STEM) combined with multislice simulation of STEM images. Atom counting was employed, with size-selected clusters as mass standards, to "fractionate" the correct cluster size in the image analysis. Systematic structure analysis shows that a hybrid structure, predicted by density functional theory, best matches nearly half the clusters observed. Most other clusters are amorphous. We believe our conclusions are consistent with all the previous, apparently contradictory structural studies of the Schmid cluster.
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Affiliation(s)
- Nan Jian
- Nanoscale Physics Research Laboratory, School of Physics And Astronomy, University of Birmingham, Birmingham, B15 2TT, UK.
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15
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Blackmore CE, Rees NV, Palmer RE. Modular construction of size-selected multiple-core Pt–TiO2 nanoclusters for electro-catalysis. Phys Chem Chem Phys 2015; 17:28005-9. [DOI: 10.1039/c5cp00285k] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Modular construction of platinum–titanium dioxide clusters, which exhibit multiple Pt cores with a preferred size of 30 ± 6 atoms.
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Affiliation(s)
- Caroline E. Blackmore
- Nanoscale Physics Research Laboratory
- School of Physics and Astronomy
- University of Birmingham
- Birmingham
- UK
| | - Neil V. Rees
- School of Chemical Engineering
- University of Birmingham
- Birmingham
- UK
| | - Richard E. Palmer
- Nanoscale Physics Research Laboratory
- School of Physics and Astronomy
- University of Birmingham
- Birmingham
- UK
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16
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Sun J, He L, Lo YC, Xu T, Bi H, Sun L, Zhang Z, Mao SX, Li J. Liquid-like pseudoelasticity of sub-10-nm crystalline silver particles. NATURE MATERIALS 2014; 13:1007-1012. [PMID: 25306422 DOI: 10.1038/nmat4105] [Citation(s) in RCA: 121] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2013] [Accepted: 09/04/2014] [Indexed: 06/04/2023]
Abstract
In nanotechnology, small-volume metals with large surface area are used as electrodes, catalysts, interconnects and antennae. Their shape stability at room temperature has, however, been questioned. Using in situ high-resolution transmission electron microscopy, we find that Ag nanoparticles can be deformed like a liquid droplet but remain highly crystalline in the interior, with no sign of dislocation activity during deformation. Surface-diffusion-mediated pseudoelastic deformation is evident at room temperature, which can be driven by either an external force or capillary-energy minimization. Atomistic simulations confirm that such highly unusual Coble pseudoelasticity can indeed happen for sub-10-nm Ag particles at room temperature and at timescales from seconds to months.
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Affiliation(s)
- Jun Sun
- SEU-FEI Nano-Pico Center, Key Lab of MEMS of Ministry of Education, Southeast University, Nanjing, 210096, China
| | - Longbing He
- SEU-FEI Nano-Pico Center, Key Lab of MEMS of Ministry of Education, Southeast University, Nanjing, 210096, China
| | - Yu-Chieh Lo
- 1] Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA [2] Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA [3] Center for Elements Strategy Initiative for Structural Materials (ESISM), Kyoto University, Sakyo, Kyoto 606-8501, Japan
| | - Tao Xu
- SEU-FEI Nano-Pico Center, Key Lab of MEMS of Ministry of Education, Southeast University, Nanjing, 210096, China
| | - Hengchang Bi
- SEU-FEI Nano-Pico Center, Key Lab of MEMS of Ministry of Education, Southeast University, Nanjing, 210096, China
| | - Litao Sun
- SEU-FEI Nano-Pico Center, Key Lab of MEMS of Ministry of Education, Southeast University, Nanjing, 210096, China
| | - Ze Zhang
- Department of Materials Science and Engineering, State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou, 310027, China
| | - Scott X Mao
- Department of Mechanical Engineering and Materials Science, University of Pittsburgh, 3700 O'Hara Street Pittsburgh, Pennsylvania 15261, USA
| | - Ju Li
- 1] Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA [2] Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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17
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Henry CR. Metal nanocrystals: Deforming like liquid droplets. NATURE MATERIALS 2014; 13:999-1000. [PMID: 25342527 DOI: 10.1038/nmat4124] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Affiliation(s)
- Claude R Henry
- Centre Interdisciplinaire de Nanoscience de Marseille, Aix-Marseille Université / CNRS, UMR 7325, F-13288 Marseille cedex 09, France
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18
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Atomic surface diffusion on Pt nanoparticles quantified by high-resolution transmission electron microscopy. Micron 2014; 63:52-6. [DOI: 10.1016/j.micron.2013.12.011] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2013] [Revised: 12/20/2013] [Accepted: 12/21/2013] [Indexed: 11/18/2022]
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19
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Kumara C, Zuo X, Cullen DA, Dass A. Faradaurate-940: synthesis, mass spectrometry, electron microscopy, high-energy X-ray diffraction, and X-ray scattering study of Au∼940±20(SR)∼160±4 nanocrystals. ACS NANO 2014; 8:6431-6439. [PMID: 24813022 DOI: 10.1021/nn501970v] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Obtaining monodisperse nanocrystals and determining their composition to the atomic level and their atomic structure is highly desirable but is generally lacking. Here, we report the discovery and comprehensive characterization of a 2.9 nm plasmonic nanocrystal with a composition of Au940±20(SCH2CH2Ph)160±4, which is the largest mass spectrometrically characterized gold thiolate nanoparticle produced to date. The compositional assignment has been made using electrospray ionization and matrix-assisted laser desorption ionization mass spectrometry (MS). The MS results show an unprecedented size monodispersity, where the number of Au atoms varies by only 40 atoms (940 ± 20). The mass spectrometrically determined composition and size are supported by aberration-corrected scanning transmission electron microscopy (STEM) and synchrotron-based methods such as atomic pair distribution function (PDF) and small-angle X-ray scattering (SAXS). Lower-resolution STEM images show an ensemble of particles-1000s per frame-visually demonstrating monodispersity. Modeling of SAXS data on statistically significant nanoparticle population-approximately 10(12) individual nanoparticles-shows that the diameter is 3.0 ± 0.2 nm, supporting mass spectrometry and electron microscopy results on monodispersity. Atomic PDF based on high-energy X-ray diffraction experiments shows decent match with either a Marks decahedral or truncated octahedral structure. Atomic resolution STEM images of single particles and their fast Fourier transform suggest face-centered cubic arrangement. UV-visible spectroscopy data show that Faradaurate-940 supports a surface plasmon resonance peak at ̃505 nm. These monodisperse plasmonic nanoparticles minimize averaging effects and have potential application in solar cells, nano-optical devices, catalysis, and drug delivery.
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Affiliation(s)
- Chanaka Kumara
- Department of Chemistry and Biochemistry, University of Mississippi, Oxford, Mississippi 38677, United States
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20
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O'Mullane AP. From single crystal surfaces to single atoms: investigating active sites in electrocatalysis. NANOSCALE 2014; 6:4012-4026. [PMID: 24599277 DOI: 10.1039/c4nr00419a] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Electrocatalytic processes will undoubtedly be at the heart of energising future transportation and technology with the added importance of being able to create the necessary fuels required to do so in an environmentally friendly and cost effective manner. For this to be successful two almost mutually exclusive surface properties need to be reconciled, namely producing highly active/reactive surface sites that exhibit long term stability. This article reviews the various approaches which have been undertaken to study the elusive nature of these active sites on metal surfaces which are considered as adatoms or clusters of adatoms with low coordination number. This includes the pioneering studies at extended well defined stepped single crystal surfaces using cyclic voltammetry up to the highly sophisticated in situ electrochemical imaging techniques used to study chemically synthesised nanomaterials. By combining the information attained from single crystal surfaces, individual nanoparticles of defined size and shape, density functional theory calculations and new concepts such as mesoporous multimetallic thin films and single atom electrocatalysts new insights into the design and fabrication of materials with highly active but stable active sites can be achieved. The area of electrocatalysis is therefore not only a fascinating and exciting field in terms of realistic technological and economical benefits but also from the fundamental understanding that can be acquired by studying such an array of interesting materials.
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Affiliation(s)
- Anthony P O'Mullane
- School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, GPO Box 2434, Brisbane, QLD 4001, Australia.
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21
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Yamamoto K, Imaoka T. Precision synthesis of subnanoparticles using dendrimers as a superatom synthesizer. Acc Chem Res 2014; 47:1127-36. [PMID: 24576189 DOI: 10.1021/ar400257s] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Classical metal-based nanomaterials come in two prominent types: a mononuclear or multinuclear complex chemically stabilized by organic ligands or a nanoparticle (also called a nanorod, nanosheet, or nanocrystal) physically stabilized by inorganic or polymer supports. Over the last decade, a class of superatoms that lies between these categories of materials has attracted attention because their properties are dramatically different from those typically ascribed to their component elements. Typically the superatoms include a specific, low number of metallic atoms. Because a one-atom difference can alter the properties of these superatoms, their synthesis must be ultraprecise, requiring one-atom resolution. To date, researchers have only been able to prepare monodisperse superatoms using gas-phase synthesis followed by purification through a flight tube. Though this technique provides monodisperse superatoms, it does not allow researchers to produce them in large quantites. Other researchers have proposed ligand-assisted liquid-phase synthesis as an alternative, but this technique is only useful for a few stable "magic number" clusters. Recently researchers have developed a new approach for the synthesis of superatoms that employs a novel class of molecular templates, which can define the number of metal ions or salts precisely. As a result, researchers can now synthesize nanoparticles or even subnanoparticles successfully. A dendrimer-type template has proven to be especially useful for ultraprecise control of the atomicity of the product, but it works with a full range of metal elements. In this Account, we highlight recent advances in the precise preparation of metal-assembling complexes using the dendrimer as a template. Next we discuss the selective assembly of subnanoparticles that utilize the dendrimer as a superatom synthesizer. The resulting subnanoparticles are almost monodisperse, and as a result, some of them exhibited distinctive characteristics based on their atomicity. For example, because of the quantum-size effect, the reduction in particle size of TiO2 and other metal-oxide subnanoparticles led to a significant shift in the band-gap energy. In addition, a miniaturized platinum particle less than 1 nm in diameter showed unexpectedly high catalytic activity for the oxygen reduction reaction (ORR) and other related reactions. Of particular note, in all these examples, this substantial change in their properties arose out of a single-atom difference in the atomicity. These results suggest that next-generation subnanoparticle design could play an important role in new materials and offer an additional palette of physical and chemical properties for new applications.
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Affiliation(s)
- Kimihisa Yamamoto
- Chemical Resources
Laboratory, Tokyo Institute of Technology, Yokohama 226-8503, Japan
| | - Takane Imaoka
- Chemical Resources
Laboratory, Tokyo Institute of Technology, Yokohama 226-8503, Japan
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22
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Zambre A, Silva F, Upendran A, Afrasiabi Z, Xin Y, Paulo A, Kannan R. Synthesis and characterization of functional multicomponent nanosized gallium chelated gold crystals. Chem Commun (Camb) 2014; 50:3281-4. [DOI: 10.1039/c3cc47308b] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Multicomponent nanomaterials containing Au, Ga, and a biomolecule have been synthesized. Compositional analysis of these nanoparticles was performed by using STEM-HAADF and EELS spectroscopy.
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Affiliation(s)
- Ajit Zambre
- Department of Radiology
- University of Missouri-Columbia
- Columbia, USA
| | - Francisco Silva
- Centro de Ciências e Tecnologias Nucleares
- Instituto Superior Técnico
- 2695-066 Bobadela LRS, Portugal
| | - Anandhi Upendran
- Department of Physics
- University of Missouri-Columbia
- Columbia, USA
| | - Zahra Afrasiabi
- Department of Life and Physical Sciences
- Lincoln University
- Jefferson City, USA
| | - Yan Xin
- National High Magnetic Field Laboratory
- Florida State University
- Tallahassee, USA
| | - António Paulo
- Centro de Ciências e Tecnologias Nucleares
- Instituto Superior Técnico
- 2695-066 Bobadela LRS, Portugal
| | - Raghuraman Kannan
- Department of Radiology
- University of Missouri-Columbia
- Columbia, USA
- Department of Bioengineering
- University of Missouri-Columbia
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23
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Physico-Chemical Characteristics of Gold Nanoparticles. GOLD NANOPARTICLES IN ANALYTICAL CHEMISTRY 2014. [DOI: 10.1016/b978-0-444-63285-2.00003-1] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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24
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Luo K, Nie F, Yan Y, Wang S, Zheng X, Song Z. Study of captopril pharmacokinetics in rabbit blood with microdialysis based on online generated Au nanoclusters and pepsin–captopril interaction in luminol chemiluminescence. RSC Adv 2014. [DOI: 10.1039/c4ra09064k] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
A luminol–HAuCl4–pepsin (Pep) flow injection-chemiluminescence system was explored to determine captopril (CAP) based on the CL intensity inhibition effect and applied to study CAP pharmacokinetics in rabbits with microdialysis.
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Affiliation(s)
- Kai Luo
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education
- College of Chemistry & Material Science
- Northwest University
- Xi’an, China
| | - Fei Nie
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education
- College of Chemistry & Material Science
- Northwest University
- Xi’an, China
| | - Yumei Yan
- Key Laboratory of Resource Biology and Biotechnology in Western China
- College of Life Sciences
- Northwest University
- Xi’an, China
| | - Shixiang Wang
- Key Laboratory of Resource Biology and Biotechnology in Western China
- College of Life Sciences
- Northwest University
- Xi’an, China
| | - Xiaohui Zheng
- Key Laboratory of Resource Biology and Biotechnology in Western China
- College of Life Sciences
- Northwest University
- Xi’an, China
| | - Zhenghua Song
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education
- College of Chemistry & Material Science
- Northwest University
- Xi’an, China
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25
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Chen P, Zhou X, Andoy NM, Han KS, Choudhary E, Zou N, Chen G, Shen H. Spatiotemporal catalytic dynamics within single nanocatalysts revealed by single-molecule microscopy. Chem Soc Rev 2014; 43:1107-17. [DOI: 10.1039/c3cs60215j] [Citation(s) in RCA: 113] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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26
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Masini F, Strebel CE, McCarthy DN, Nierhoff AUF, Kehres J, Fiordaliso EM, Nielsen JH, Chorkendorff I. Methanation on mass-selected Ru nanoparticles on a planar SiO2 model support: The importance of under-coordinated sites. J Catal 2013. [DOI: 10.1016/j.jcat.2013.08.019] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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27
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Plowman BJ, Najdovski I, Pearson A, O'Mullane AP. Decoration of active sites to create bimetallic surfaces and its implication for electrochemical processes. Faraday Discuss 2013; 164:199-218. [DOI: 10.1039/c3fd00015j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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28
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Logsdail AJ, Li ZY, Johnston RL. Faceting preferences for AuN and PdN nanoclusters with high-symmetry motifs. Phys Chem Chem Phys 2013; 15:8392-400. [DOI: 10.1039/c3cp50978h] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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29
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Surrey A, Pohl D, Schultz L, Rellinghaus B. Quantitative measurement of the surface self-diffusion on Au nanoparticles by aberration-corrected transmission electron microscopy. NANO LETTERS 2012; 12:6071-7. [PMID: 23136983 DOI: 10.1021/nl302280x] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
We present a method that allows for a quantitative measurement of the surface self-diffusion on nanostructures, such as nanoparticles, at the atomic scale using aberration-corrected high-resolution transmission electron microscopy (HRTEM). The diffusion coefficient can be estimated by measuring the fluctuation of the atom column occupation at the surface of Au nanoparticles, which is directly observable in temporal sequences of HRTEM images. Both a Au icosahedron and a truncated Au octahedron are investigated, and their diffusion coefficients are found to be in the same order of magnitude, D = 10(-17) to 10(-16) cm(2)/s. It is to be assumed that the measured surface diffusion is affected by the imaging electron beam. This assumption is supported by the observed instability of a (5 × 1) surface reconstruction on a {100} Au facet.
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Affiliation(s)
- A Surrey
- IFW Dresden, Institute for Metallic Materials, P.O. Box 270116, D-01171 Dresden, Germany
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30
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Wang ZW, Palmer RE. Experimental evidence for fluctuating, chiral-type Au55 clusters by direct atomic imaging. NANO LETTERS 2012; 12:5510-4. [PMID: 23057610 DOI: 10.1021/nl303429z] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
We report the atomic-scale structures and fluctuating dynamical behavior of size-selected Au(55) clusters obtained by aberration-corrected scanning transmission electron microscopy (STEM) coupled with systematic STEM simulations. No high-symmetry structures (face-centered cubic polyhedron, icosahedron, or decahedron) were observed in our statistical investigation. We find Au(55) clusters that are characteristic of the theoretically predicted chiral structure and similar sister isomers (which together we define as the chiral structural zone). The chiral structural zone was found to arise repeatedly in the time-lapse sequences of images we measured, though other amorphous-like structures are also frequently observed. The approach demonstrated here can be applied to identify specific low-symmetry atomic structures in other small clusters and distinguish them unambiguously from high-symmetry isomers.
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Affiliation(s)
- Z W Wang
- Nanoscale Physics Research Laboratory, School of Physics and Astronomy, University of Birmingham, Birmingham, B15 2TT, United Kingdom
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31
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Van Tendeloo G, Bals S, Van Aert S, Verbeeck J, Van Dyck D. Advanced electron microscopy for advanced materials. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2012; 24:5655-5675. [PMID: 22907862 DOI: 10.1002/adma.201202107] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2012] [Indexed: 06/01/2023]
Abstract
The idea of this Review is to introduce newly developed possibilities of advanced electron microscopy to the materials science community. Over the last decade, electron microscopy has evolved into a full analytical tool, able to provide atomic scale information on the position, nature, and even the valency atoms. This information is classically obtained in two dimensions (2D), but can now also be obtained in 3D. We show examples of applications in the field of nanoparticles and interfaces.
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32
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Tyo EC, Yin C, Di Vece M, Qian Q, Kwon G, Lee S, Lee B, DeBartolo JE, Seifert S, Winans RE, Si R, Ricks B, Goergen S, Rutter M, Zugic B, Flytzani-Stephanopoulos M, Wang ZW, Palmer RE, Neurock M, Vajda S. Oxidative Dehydrogenation of Cyclohexane on Cobalt Oxide (Co3O4) Nanoparticles: The Effect of Particle Size on Activity and Selectivity. ACS Catal 2012. [DOI: 10.1021/cs300479a] [Citation(s) in RCA: 94] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Eric C. Tyo
- Department of Chemical and Environmental Engineering, School of Engineering & Applied Science, Yale University, 9 Hillhouse Avenue, New Haven, Connecticut 06520, United States
| | | | - Marcel Di Vece
- Department of Chemical and Environmental Engineering, School of Engineering & Applied Science, Yale University, 9 Hillhouse Avenue, New Haven, Connecticut 06520, United States
| | | | | | | | | | | | | | | | - Rui Si
- Department of Chemical and Biological
Engineering, Tufts University, 4 Colby
Street, Tufts University, Medford, Massachusetts 02155, United States
| | - Brian Ricks
- Department of Chemical and Biological
Engineering, Tufts University, 4 Colby
Street, Tufts University, Medford, Massachusetts 02155, United States
| | - Simone Goergen
- Department of Chemical and Biological
Engineering, Tufts University, 4 Colby
Street, Tufts University, Medford, Massachusetts 02155, United States
| | - Matthew Rutter
- Department of Chemical and Biological
Engineering, Tufts University, 4 Colby
Street, Tufts University, Medford, Massachusetts 02155, United States
| | - Branko Zugic
- Department of Chemical and Biological
Engineering, Tufts University, 4 Colby
Street, Tufts University, Medford, Massachusetts 02155, United States
| | - Maria Flytzani-Stephanopoulos
- Department of Chemical and Biological
Engineering, Tufts University, 4 Colby
Street, Tufts University, Medford, Massachusetts 02155, United States
| | - Zhi Wei Wang
- Nanoscale Physics Research Laboratory,
School of Physics and Astronomy, University of Birmingham, Birmingham, B15 2TT, U.K
| | - Richard E. Palmer
- Nanoscale Physics Research Laboratory,
School of Physics and Astronomy, University of Birmingham, Birmingham, B15 2TT, U.K
| | | | - Stefan Vajda
- Department of Chemical and Environmental Engineering, School of Engineering & Applied Science, Yale University, 9 Hillhouse Avenue, New Haven, Connecticut 06520, United States
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33
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Wang ZW, Palmer RE. Direct atomic imaging and dynamical fluctuations of the tetrahedral Au(20) cluster. NANOSCALE 2012; 4:4947-4949. [PMID: 22743848 DOI: 10.1039/c2nr31071f] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We report real-space, atomic-resolution images of Au(20) clusters obtained with the aberration-corrected Scanning Transmission Electron Microscopy. The proposed tetrahedral (FCC segment) pyramid structure is confirmed. The clusters cycle between isomers under the electron beam in the time-lapse images acquired. Disordered variants on the high symmetry forms are commonly observed. We believe that the direct experimental identification of these kinds of atomic structure, and the fluctuations between them, is fundamental to our understanding of nanoparticle structures, as well as applications such as heterogeneous catalysis.
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Affiliation(s)
- Z W Wang
- Nanoscale Physics Research Laboratory, School of Physics and Astronomy, University of Birmingham, B15 2TT, Birmingham, UK
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34
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Weber ML, Litz JP, Masiello DJ, Willets KA. Super-resolution imaging reveals a difference between SERS and luminescence centroids. ACS NANO 2012; 6:1839-1848. [PMID: 22248484 DOI: 10.1021/nn205080q] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Super-resolution optical imaging of Rhodamine 6G surface-enhanced Raman scattering (SERS) and silver luminescence from colloidal silver aggregates are measured with sub-5 nm resolution and found to originate from distinct spatial locations on the nanoparticle surface. Using correlated scanning electron microscopy, the spatial origins of the two signals are mapped onto the nanoparticle structure, revealing that, while both types of emission are plasmon-mediated, SERS is a highly local effect, probing only a single junction in a nanoparticle aggregate, whereas luminescence probes all collective plasmon modes within the nanostructure. Calculations using the discrete-dipole approximation to calculate the weighted centroid position of both the |E|(2)/|E(inc)|(2) and |E|(4)/|E(inc)|(4) electromagnetic fields were compared to the super-resolution centroid positions of the SERS and luminescence data and found to agree with the proposed plasmon dependence of the two emission signals. These results are significant to the field of SERS because they allow us to assign the exact nanoparticle junction responsible for single-molecule SERS emission in higher order aggregates and also provide insight into how SERS is coupled into the plasmon modes of the underlying nanostructure, which is important for developing new theoretical models to describe SERS emission.
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Affiliation(s)
- Maggie L Weber
- Department of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195-1700, United States
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