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Mendoza-Cruz R, Palomares-Báez JP, López-López SM, Montejano-Carrizales JM, Rodríguez López JL, José Yacamán M, Bazán-Díaz L. Experimental High-Resolution Observation of the Truncated Double-Icosahedron Structure: A Stable Twinned Shell in Alloyed Au-Ag Core@Shell Nanoparticles. NANO LETTERS 2024; 24:4072-4081. [PMID: 38557078 PMCID: PMC11010228 DOI: 10.1021/acs.nanolett.3c04435] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2023] [Revised: 03/26/2024] [Accepted: 03/27/2024] [Indexed: 04/04/2024]
Abstract
Given the binary nature of nanoalloy systems, their properties are dependent on their size, shape, structure, composition, and chemical ordering. When energy and entropic factors for shapes and structure variations are considered in nanoparticle growth, the spectra of shapes become so vast that even metastable arrangements have been reported under ambient conditions. Experimental and theoretical variations of multiply twinned particles have been observed, from the Ino and Marks decahedra to polyicosahedra and polydecahedra with comparable energetic stability among them. Herein, we report the experimental production of a stable doubly truncated double-icosahedron structure (TdIh) in Au-Ag nanoparticles, in which a twinned Ag-rich alloyed shell is reconstructed on a Au-Ag alloyed Ino-decahedral core. The structure, chemical composition, and growth pathway are proposed on the basis of high-angle annular dark-field scanning transmission electron microscopy analysis and excess energy calculations, while its structural stability is estimated by large-scale atomic molecular dynamics simulations. This novel nanostructure differs from other structures previously reported.
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Affiliation(s)
- Rubén Mendoza-Cruz
- Instituto
de Investigaciones en Materiales, Universidad
Nacional Autónoma de México, Circuito Exterior, Ciudad Universitaria, Ciudad de México, Mexico 04510
| | - Juan Pedro Palomares-Báez
- Facultad
de Ciencias Químicas, Universidad
Autónoma de Chihuahua, Circuito Universitario s/n, Campus II, Chihuahua, Mexico 31125
| | - Stephan Mario López-López
- Instituto
de Investigaciones en Materiales, Universidad
Nacional Autónoma de México, Circuito Exterior, Ciudad Universitaria, Ciudad de México, Mexico 04510
- Posgrado
en Ciencia e Ingeniería de Materiales, Universidad Nacional Autónoma de México, Circuito Exterior, Ciudad Universitaria, Ciudad de México, Mexico 04510
| | | | - José Luis Rodríguez López
- Advanced
Materials Department, Instituto Potosino
de Investigación Científica y Tecnológica, A.C., San Luis Potosí, Mexico 78216
| | - Miguel José Yacamán
- Department
of Applied Physics and Materials Science and MIRA, Northern Arizona University, Flagstaff, Arizona 86011, United States
| | - Lourdes Bazán-Díaz
- Instituto
de Investigaciones en Materiales, Universidad
Nacional Autónoma de México, Circuito Exterior, Ciudad Universitaria, Ciudad de México, Mexico 04510
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2
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Duan Y, Che S. Chiral Mesostructured Inorganic Materials with Optical Chiral Response. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2205088. [PMID: 36245314 DOI: 10.1002/adma.202205088] [Citation(s) in RCA: 15] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2022] [Revised: 09/15/2022] [Indexed: 06/16/2023]
Abstract
Fabricating chiral inorganic materials and revealing their unique quantum confinement-determined optical chiral responses are crucial tasks in the multidisciplinary fields of chemistry, physics, and biology. The field of chiral mesostructured inorganic materials started from the synthesis of individual nanocrystals and evolved to include their assembly from metals, semiconductors, ceramics, and inorganic salts endowed with various chiral structures ranging from atomic to micron scales. This tutorial review highlights the recent research on chiral mesostructured inorganic materials, especially the novel expression of mesostructured chirality and endowed optical chiral response, and it may inspire us with new strategies for the design of chiral inorganic materials and new opportunities beyond the traditional applications of chirality. Fabrication methods for chiral mesostructured inorganic materials are classified according to chirality type, scale, and symmetry-breaking mechanism. Special attention is given to highlight systems with original discoveries, exceptional phenomena, or unique mechanisms of optical chiral response for left- and right-handedness.
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Affiliation(s)
- Yingying Duan
- School of Chemical Science and Engineering, Tongji University, 1239 Siping Road, Shanghai, 200092, P. R. China
| | - Shunai Che
- School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, State Key Laboratory of Matrix Composite, Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, P. R. China
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3
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Abstract
ConspectusNanosynthesis is the art of creating nanostructures, with on-demand synthesis as the ultimate goal. Noble metal nanoparticles have wide applications, but the available synthetic methods are still limited, often giving nanospheres and symmetrical nanocrystals. The fundamental reason is that the conventional weak ligands are too labile to influence the materials deposition, so the equivalent facets always grow equivalently. Considering that the ligands are the main synthetic handles in colloidal synthesis, our group has been exploring strong ligands for new growth modes, giving a variety of sophisticated nanostructures. The model studies often involve metal deposition on seeds functionalized with a certain strong ligand, so that the uneven distribution of the surface ligands could guide the subsequent deposition.In this Account, we focus on the design principles underlying the new growth modes, summarizing our efforts in this area along with relevant literature works. The basics of ligand control are first revisited. Then, the four major growth modes are summarized as follows: (1) The curvature effects would divert the materials deposition away from the high-curvature tips when the ligands are insufficient. With ligands fully covering the seeds, the sparser ligand packing at the tips would then promote the initial nucleation thereon. (2) The strong ligands may get trapped under the incoming metal layer, thus modulating the interfacial energy of the core-shell interface. The evidence for embedded ligands is discussed, along with examples of Janus nanostructures arising from the synthetic control, including metal-metal, metal-semiconductor, and metal-C60 systems using a variety of ligands. (3) Active surface growth is an unusual mode with divergent growth rates, so that part of the emerging surface is inhibited, and the growth is focused onto a few active sites. With seeds attached to oxide substrates, the selective deposition at the metal-substrate interface produces ultrathin nanowires. The synthesis can be generally applied to grow Au, Ag, Pd, Pt, and hybrid nanowires, with straight, spiral, or helical structures, and even rapid alteration of segments via electrochemical methods. In contrast, active surface growth for colloidal nanoparticles has to be more carefully controlled. The rich growth phenomena are discussed, highlighting the role of strong ligands, the control of deposition rates, the chiral induction, and the evidence for the active sites. (4) An active site with sparse ligands could also be exploited in etching, where the freshly exposed surface would promote further etching. The result is an unusual sharpening etching mode, in contrast to the conventional rounding mode for minimized surface energy.Colloidal nanosynthesis holds great promise for scalable on-demand synthesis, providing the crucial nanomaterials for future explorations. The strong ligands have delivered powerful synthetic controls, which could be further enhanced with in-depth studies on growth mechanisms and synthetic strategies, as well as functions and properties.
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Affiliation(s)
- Ruixue Xiao
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Jia Jia
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Ruoxu Wang
- Department of Chemistry, School of Science, Westlake University, Hangzhou 310023, China
| | - Yuhua Feng
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Hongyu Chen
- Department of Chemistry, School of Science, Westlake University, Hangzhou 310023, China
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4
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Song X, Zhang X, Chang Q, Yao X, Li M, Zhang R, Liu X, Song C, Ng YXA, Ang EH, Ou Z. High-Resolution Electron Tomography of Ultrathin Boerdijk-Coxeter-Bernal Nanowire Enabled by Superthin Metal Surface Coating. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 18:e2203310. [PMID: 36084232 DOI: 10.1002/smll.202203310] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2022] [Revised: 08/22/2022] [Indexed: 06/15/2023]
Abstract
The rapid advancement of transmission electron microscopy has resulted in revolutions in a variety of fields, including physics, chemistry, and materials science. With single-atom resolution, 3D information of each atom in nanoparticles is revealed, while 4D electron tomography is shown to capture the atomic structural kinetics in metal nanoparticles after phase transformation. Quantitative measurements of physical and chemical properties such as chemical coordination, defects, dislocation, and local strain have been made. However, due to the incompatibility of high dose rate with other ultrathin morphologies, such as nanowires, atomic electron tomography has been primarily limited to quasi-spherical nanoparticles. Herein, the 3D atomic structure of a complex core-shell nanowire composed of an ultrathin Boerdijk-Coxeter-Bernal (BCB) core nanowire and a noble metal thin layer shell deposited on the BCB nanowire surface is discovered. Furthermore, it is demonstrated that a new superthin noble metal layer deposition on an ultrathin BCB nanowire could mitigate electron beam damage using an in situ transmission electron microscope and atomic resolution electron tomography. The colloidal coating method developed for electron tomography can be broadly applied to protect the ultrathin nanomaterials from electron beam damage, benefiting both the advanced material characterizations and enabling fundamental in situ mechanistic studies.
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Affiliation(s)
- Xiaohui Song
- School of Materials Science and Engineering, Hefei University of Technology, Hefei, Anhui Province, 230009, China
- Department of Materials Science and Engineering, University of California at Berkeley & The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Xingyu Zhang
- Faculty of Materials and Manufacting, Beijing University of Technology, Pingleyuan 100, Beijng, 100124, China
| | - Qiang Chang
- School of Materials Science and Engineering, Hefei University of Technology, Hefei, Anhui Province, 230009, China
| | - Xin Yao
- School of Materials Science and Engineering, Hefei University of Technology, Hefei, Anhui Province, 230009, China
| | - Mufan Li
- Chemistry Department, University of California at Berkeley & Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Ruopeng Zhang
- Department of Materials Science and Engineering, University of California at Berkeley & The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Xiaotao Liu
- Department of Materials Science and Engineering, University of California at Berkeley & The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Chengyu Song
- Department of Materials Science and Engineering, University of California at Berkeley & The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Yun Xin Angel Ng
- Natural Sciences and Science Education, National Institute of Education, Nanyang Technological University, Singapore, 637616, Singapore
| | - Edison Huixiang Ang
- Natural Sciences and Science Education, National Institute of Education, Nanyang Technological University, Singapore, 637616, Singapore
| | - Zihao Ou
- School of Materials Science and Engineering, Stanford University, Stanford, CA, 94305, USA
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Bruefach A, Ophus C, Scott MC. Analysis of Interpretable Data Representations for 4D-STEM Using Unsupervised Learning. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2022; 28:1-11. [PMID: 36073035 DOI: 10.1017/s1431927622012259] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Understanding the structure of materials is crucial for engineering devices and materials with enhanced performance. Four-dimensional scanning transmission electron microscopy (4D-STEM) is capable of mapping nanometer-scale local crystallographic structure over micron-scale field of views. However, 4D-STEM datasets can contain tens of thousands of images from a wide variety of material structures, making it difficult to automate detection and classification of structures. Traditional automated analysis pipelines for 4D-STEM focus on supervised approaches, which require prior knowledge of the material structure and cannot describe anomalous or deviant structures. In this article, a pipeline for engineering 4D-STEM feature representations for unsupervised clustering using non-negative matrix factorization (NMF) is introduced. Each feature is evaluated using NMF and results are presented for both simulated and experimental data. It is shown that some data representations more reliably identify overlapping grains. Additionally, real space refinement is applied to identify spatially distinct sample regions, allowing for size and shape analysis to be performed. This work lays the foundation for improved analysis of nanoscale structural features in materials that deviate from expected crystallographic arrangement using 4D-STEM.
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Affiliation(s)
- Alexandra Bruefach
- Department of Materials Science and Engineering, University of California, Berkeley, CA 94720, USA
| | - Colin Ophus
- National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA
| | - Mary C Scott
- Department of Materials Science and Engineering, University of California, Berkeley, CA 94720, USA
- National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA
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6
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Fages T, Jolibois F, Poteau R. Recognition of the three-dimensional structure of small metal nanoparticles by a supervised artificial neural network. Theor Chem Acc 2021. [DOI: 10.1007/s00214-021-02795-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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7
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Zhang S, Liu K, Liu Z, Liu M, Zhang Z, Qiao Z, Ming L, Gao C. Highly Strained Au-Ag-Pd Alloy Nanowires for Boosted Electrooxidation of Biomass-Derived Alcohols. NANO LETTERS 2021; 21:1074-1082. [PMID: 33448860 DOI: 10.1021/acs.nanolett.0c04395] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Although strain engineering is effective in boosting the activities of noble metal catalysts, it remains desirable to construct fully strained catalysts to push the activity to even higher levels. Herein, we report a novel route to strong lattice strains of a Pd-based catalyst by radial growth of a Pd-rich phase on Au-Ag alloy nanowires that are no thicker than 1.5 nm. It creates not only tensile strains in the Pd-rich sheath due to the core-sheath lattice mismatch but also distortion and twinning of the lattice, producing nonhomogeneous local strains as hotspots for the catalysis. Toward the electrochemical oxidation of biomass-derived alcohols including ethanol, ethylene glycol, and glycerol, the highly strained nanowires outperformed their less strained counterparts and reached up to 13.6, 18.2, and 11.1 A mgPd-1, respectively. This strain engineering strategy may open new avenues to highly efficient catalysts for direct alcohol fuel cells and many other applications.
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Affiliation(s)
- Shumeng Zhang
- Center for Materials Chemistry, Frontier Institute of Science and Technology, and State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710054, China
| | - Kai Liu
- Center for Materials Chemistry, Frontier Institute of Science and Technology, and State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710054, China
| | - Zhaojun Liu
- Center for Materials Chemistry, Frontier Institute of Science and Technology, and State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710054, China
| | - Moxuan Liu
- Center for Materials Chemistry, Frontier Institute of Science and Technology, and State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710054, China
| | - Zhixue Zhang
- Center for Materials Chemistry, Frontier Institute of Science and Technology, and State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710054, China
| | - Zhun Qiao
- Center for Materials Chemistry, Frontier Institute of Science and Technology, and State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710054, China
| | - Liang Ming
- Fengcheng Advanced Energy Materials Research Institute, Ningbo, Zhejiang 315500, China
| | - Chuanbo Gao
- Center for Materials Chemistry, Frontier Institute of Science and Technology, and State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710054, China
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8
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Chang YH, Jang JW, Chang YC, Lee SH, Siao TF. Gold Nanohelices: A New Synthesis Route, Characterization, and Plasmonic E-Field Enhancement. ACS OMEGA 2020; 5:14860-14867. [PMID: 32637760 PMCID: PMC7330912 DOI: 10.1021/acsomega.9b02586] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/12/2019] [Accepted: 05/11/2020] [Indexed: 06/11/2023]
Abstract
Gold nanohelices (AuNHs) are synthesized using surfactant-assisted seed-mediated growth in an aqueous solution. AuNHs with diameters and lengths of 30-150 nm and several micrometers, respectively, are grown in a reaction carried out at 15 °C for 20 h by adding poly(ethylene glycol)(12)tridecyl ether, polyvinylpyrrolidone, and cetyltrimethylammonium bromide as the capping agents in an HAuCl4(aq) solution. With the addition of gold nanoparticles (AuNPs) in the reaction, the yield of the helical products is considerably increased, which indicates that AuNPs behave as the seeds for AuNH growth. The growth routes of AuNHs in the system are investigated by transmission electron microscopy measurements. Finite-difference time-domain (FDTD) simulations show that total extinction of the AuNH at 660 and 570 nm is dominantly influenced by strong e-field enhancement and the scattering of light incidence. In a practical application, surface-enhanced Raman scattering (SERS) measurements are conducted using AuNHs as the substrates and 4-mercaptobenzoic acid as the probe. A detection limit of 20 ppb is acquired using a micro-Raman spectrometer using a 633 nm He-Ne laser with a power of 3.35 mW which corresponds with the FDTD simulation results and reveals that AuNHs are superior SERS templates with resonance tuning ability in consequence of their unique helical architectures.
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Affiliation(s)
- Yu-Hsu Chang
- Department
of Materials and Mineral Resources Engineering, Institute of Mineral
Resources Engineering, National Taipei University
of Technology, Taipei 10608, Taiwan, R.O.C.
| | - Jae-Won Jang
- Division
of Physics and Semiconductor Science, Dongguk
University, Seoul 04620, Republic of Korea
| | - Yao-Chun Chang
- Department
of Materials and Mineral Resources Engineering, Institute of Mineral
Resources Engineering, National Taipei University
of Technology, Taipei 10608, Taiwan, R.O.C.
| | - Seung-Hoon Lee
- Oak
Ridge Institute for Science and Education, Durham, North Carolina 27708, United States
- Department
of Chemistry, Duke University, Durham, North Carolina 27708, United States
| | - Ting-Fong Siao
- Department
of Materials and Mineral Resources Engineering, Institute of Mineral
Resources Engineering, National Taipei University
of Technology, Taipei 10608, Taiwan, R.O.C.
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9
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Lu Y, Cheng X, Li H, Zhao J, Wang W, Wang Y, Chen H. Braiding Ultrathin Au Nanowires into Ropes. J Am Chem Soc 2020; 142:10629-10633. [PMID: 32479732 DOI: 10.1021/jacs.0c03445] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Braiding is a common skill in daily life but rare at the nanoscale. Most of the current nanohelices are directly grown or assembled without involving mechanical interactions, and they are thus distinctively different from ropes in terms of functions and mechanisms. Here, by coaxially twisting multiple ultrathin Au nanowires, nanoropes are synthesized with elegant helical patterns that are consistent with the macroscopic equivalents. The strain relaxation of lattice transformation causes the nanowires to pursue the maximum degree of twisting, while the mutual packing interactions in a bundle prevent sideways emergence of U-turns. The consistent chirality of the seemingly independent strands can only arise when a first twisting strand causes morphological deformation in its neighbors, which induces the collective uni-directional twisting. The spontaneous braiding and the "remote" control of the nanowires involve mechanical interactions and possibly energy transmission, thus opening doors to chiral assembly and future smart nanodevices.
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Affiliation(s)
| | | | | | | | | | | | - Hongyu Chen
- Institute of Advanced Synthesis, and School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, 211816 Nanjing, China
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10
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Ni B, Shi Y, Wang X. The Sub-Nanometer Scale as a New Focus in Nanoscience. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2018; 30:e1802031. [PMID: 30039573 DOI: 10.1002/adma.201802031] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Indexed: 06/08/2023]
Abstract
Size is one of the central issues in nanoscience. The practical meaning of the term "sub-nanometric material (SNM)" requires two aspects: (1) its size should be at the atomic level; (2) it shows unique (size-related) properties compared to its nano-counterparts with larger sizes. Here, SNMs in the form of wires (SNWs) and the unique properties arising from their special size are reviewed. First, their polymer-like behavior, including rheological behavior and self-assembly, is dicussed. Their origins may stem from the special size and the ligands around the wire. Even a slight increase in diameter would risk the polymer-like behavior. Meanwhile, the ligands on SNWs are proportional to the inorganic entity at this scale. Consequently, surface ligands should have a profound impact on the properties, like catalysis, self-assembly, optics, etc. To reveal more potential applications, their applications in energy conversion are comprehensively reviewed. To some extent, characterization can greatly influence the way things are observed. Thus, some appropriate characterization techniques are briefly introduced. Finally, another emerging part of SNWs (atomic chain material) is briefly introduced. It is hoped that this review can provide new insights to this special scale.
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Affiliation(s)
- Bing Ni
- Key Lab of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing, 100084, China
| | - Yuang Shi
- Key Lab of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing, 100084, China
| | - Xun Wang
- Key Lab of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing, 100084, China
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11
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Vargas JA, Petkov V, Nouh ESA, Ramamoorthy RK, Lacroix LM, Poteau R, Viau G, Lecante P, Arenal R. Ultrathin Gold Nanowires with the Polytetrahedral Structure of Bulk Manganese. ACS NANO 2018; 12:9521-9531. [PMID: 30199625 DOI: 10.1021/acsnano.8b05036] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Despite the intensive interest in thin gold nanowires for a variety of technologically important applications, key details of the mechanism of their formation and atomic-scale structure remain unknown. Here we synthesize highly uniform, very long, and ultrathin gold nanowires in a liquid-phase environment and study their nucleation and growth using in situ high-energy synchrotron X-ray diffraction. By controlling the type of solvents, reducing agents, and gold precursor concentration, it is shown that the nucleation and growth of gold nanowires involve the emergence and self-assembly of transient linear gold complexes, respectively. In sharp contrast with the face-centered-cubic bulk gold, the evolved nanowires are found to possess a tetrahedrally close packed structure incorporating distorted icosahedra and larger size coordination polyhedra of the type observed with the room-temperature phase of bulk manganese. We relate the complexes to synergistic effects between the selected precursor and reducing agents that become appreciable over a narrow range of their molar ratios. We attribute the unusual structural state of gold nanowires to geometrical frustration effects arising from the conflicting tendencies of assemblies of metal atoms to evolve toward attaining high atomic packing density while keeping the atomic-level stresses low, ultimately favoring the growth of cylindrical nanowires with a well-defined diameter and atomically smooth surface. Our work provides a roadmap for comprehensive characterization and, hence, better understanding of 1D metallic nanostructures with an unusual atomic arrangement and may have important implications for their synthesis and performance in practical applications.
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Affiliation(s)
- Jorge A Vargas
- Department of Physics , Central Michigan University , Mt. Pleasant , Michigan 48858 , United States
| | - Valeri Petkov
- Department of Physics , Central Michigan University , Mt. Pleasant , Michigan 48858 , United States
| | - El Said A Nouh
- Université de Toulouse, LPCNO, UMR 5215 INSA-CNRS-UPS , 135 Avenue de Rangueil , F-31077 Toulouse , France
| | - Raj Kumar Ramamoorthy
- Université de Toulouse, LPCNO, UMR 5215 INSA-CNRS-UPS , 135 Avenue de Rangueil , F-31077 Toulouse , France
| | - Lise-Marie Lacroix
- Université de Toulouse, LPCNO, UMR 5215 INSA-CNRS-UPS , 135 Avenue de Rangueil , F-31077 Toulouse , France
| | - Romuald Poteau
- Université de Toulouse, LPCNO, UMR 5215 INSA-CNRS-UPS , 135 Avenue de Rangueil , F-31077 Toulouse , France
| | - Guillaume Viau
- Université de Toulouse, LPCNO, UMR 5215 INSA-CNRS-UPS , 135 Avenue de Rangueil , F-31077 Toulouse , France
| | - Pierre Lecante
- CEMES, France Centre d'Elaboration de Matériaux et d'Etudes Structurales, CEMES, CNRS , 29 Rue Jeanne Marvig , F-31055 Toulouse , France
| | - Raul Arenal
- Laboratorio de Microscopias Avanzadas (LMA) , Instituto de Nanociencia de Aragon (INA), U. Zaragoza , C/Mariano Esquillor s/n , 50018 Zaragoza , Spain
- ARAID Foundation , 50018 Zaragoza , Spain
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12
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Lu Y, Yang S, Xu J, Liu Z, Wang H, Lin M, Wang Y, Chen H. Twisting Ultrathin Au Nanowires into Double Helices. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2018; 14:e1801925. [PMID: 30063294 DOI: 10.1002/smll.201801925] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2018] [Revised: 06/28/2018] [Indexed: 06/08/2023]
Abstract
Previously, double helix nanowire was reported by coating Pd/Pt/Au onto Au-Ag alloy nanowire. Here, straight oleylamine-stabilized ultrathin Au nanowires with single crystalline fcc lattice are surprisingly converted into double helix helices upon reacting with Ag in tetrahydrofuran (THF). The obtained Au-Ag helical nanowires contain lattice distinctively different from the fcc lattice and are different in many aspects with the previous system. The discovery may expand the scope of nanoscale double helix formation and the understanding of lattice transformation among ultrafine nanostructures.
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Affiliation(s)
- Yan Lu
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, Nanjing, 211816, P. R. China
| | - Shenghao Yang
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, Nanjing, 211816, P. R. China
| | - Jun Xu
- Department of Physics, Research Institute for Biomimetics and Soft Matter, Fujian Provincial Key Laboratory for Soft Functional Materials, Xiamen University, Xiamen, 361005, P. R. China
| | - Zhenzhong Liu
- Research Institute of Taizhou, Zhejiang University, Taizhou, 318000, P. R. China
| | - Hong Wang
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, Nanjing, 211816, P. R. China
| | - Ming Lin
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR) Singapore, 117602, Singapore
| | - Yawen Wang
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, Nanjing, 211816, P. R. China
| | - Hongyu Chen
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, Nanjing, 211816, P. R. China
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13
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Cheng H, Yang N, Lu Q, Zhang Z, Zhang H. Syntheses and Properties of Metal Nanomaterials with Novel Crystal Phases. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2018; 30:e1707189. [PMID: 29658155 DOI: 10.1002/adma.201707189] [Citation(s) in RCA: 93] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2017] [Revised: 01/09/2018] [Indexed: 05/13/2023]
Abstract
In recent decades, researchers have devoted tremendous effort into the rational design and controlled synthesis of metal nanomaterials with well-defined size, morphology, composition, and structure, and great achievements have been reached. However, the crystal-phase engineering of metal nanomaterials still remains a big challenge. Recent research has revealed that the crystal phase of metal nanomaterials can significantly alter their properties, arising from the distinct atomic arrangement and modified electronic structure. Until now, it has been relatively uncommon to synthesize metal nanomaterials with novel crystal phases in spite of the fact that these nanostructures would be promising for various applications. Here, the research progress regarding the fine control of noble metal (Au, Ag, Ru, Rh, Pd) and non-noble metal (Fe, Co, Ni) nanomaterials with novel crystal phases is reviewed. First, synthesis strategies and their phase transformations are summarized, while highlighting the peculiar characteristics of each element. The phase-dependent properties are then discussed by providing representative examples. Finally, the challenges and perspectives in this emerging field are proposed.
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Affiliation(s)
- Hongfei Cheng
- Center for Programmable Materials, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
| | - Nailiang Yang
- Center for Programmable Materials, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
| | - Qipeng Lu
- Center for Programmable Materials, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
| | - Zhicheng Zhang
- Center for Programmable Materials, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
| | - Hua Zhang
- Center for Programmable Materials, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
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14
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He J, Wang Y, Fan Z, Wang Y, Zhang H, Chen H. Spirals and helices by asymmetric active surface growth. NANOSCALE 2017; 9:18352-18358. [PMID: 29143848 DOI: 10.1039/c7nr06574d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We show that spiral and helical Au nanowires can be directly grown via the active surface growth mechanism. The formation of spiral nanowires as opposed to straight nanowires is not triggered by the presence of a particular reactant, but controlled by the ratio of reactant concentrations. We propose that the asymmetric blocking of the Au-substrate interface induces imbalanced growth of the nanowire, causing it to curve. Blocking a single corner of the active interface leads to spiral nanowires whereas blocking two corners leads to helical nanowires. Spiral and helical nanowires become more frequent when the diffusion of Au is the limiting factor, as the reactant ratio falls below a critical value. The transition from helices to spirals and finally to nearly straight nanowires indicates a gradual loss of the blocked sites, hence supporting the asymmetric blocking mechanism.
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Affiliation(s)
- Jiating He
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore.
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15
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Fu X, Yuan J. Non-destructive detection of cross-sectional strain and defect structure in an individual Ag five-fold twinned nanowire by 3D electron diffraction mapping. Sci Rep 2017; 7:6206. [PMID: 28740257 PMCID: PMC5524976 DOI: 10.1038/s41598-017-06485-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2017] [Accepted: 06/14/2017] [Indexed: 12/03/2022] Open
Abstract
Coherent x-ray diffraction investigations on Ag five-fold twinned nanowires (FTNWs) have drawn controversial conclusions concerning whether the intrinsic 7.35° angular gap could be compensated homogeneously through phase transformation or inhomogeneously by forming disclination strain field. In those studies, the x-ray techniques only provided an ensemble average of the structural information from all the Ag nanowires. Here, using three-dimensional (3D) electron diffraction mapping approach, we non-destructively explore the cross-sectional strain and the related strain-relief defect structures of an individual Ag FTNW with diameter about 30 nm. The quantitative analysis of the fine structure of intensity distribution combining with kinematic electron diffraction simulation confirms that for such a Ag FTNW, the intrinsic 7.35° angular deficiency results in an inhomogeneous strain field within each single crystalline segment consistent with the disclination model of stress-relief. Moreover, the five crystalline segments are found to be strained differently. Modeling analysis in combination with system energy calculation further indicates that the elastic strain energy within some crystalline segments, could be partially relieved by the creation of stacking fault layers near the twin boundaries. Our study demonstrates that 3D electron diffraction mapping is a powerful tool for the cross-sectional strain analysis of complex 1D nanostructures.
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Affiliation(s)
- Xin Fu
- General Research Institute for Nonferrous Metals, Beijing, 100088, P.R. China. .,Guobiao (Beijing) Testing & Certification Co., Ltd., Beijing, 100088, P.R. China.
| | - Jun Yuan
- Department of Physics, University of York, York, YO10 5DD, United Kingdom.
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16
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Wang Y, He J, Mu X, Wang D, Zhang B, Shen Y, Lin M, Kübel C, Huang Y, Chen H. Solution Growth of Ultralong Gold Nanohelices. ACS NANO 2017; 11:5538-5546. [PMID: 28587454 DOI: 10.1021/acsnano.7b00710] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Metallic nanohelices are extremely rare and, to date, have never been synthesized by a direct solution method. In this work, we report ultralong Au nanohelices grown in solution under ambient conditions. They are ultralong with several tens of micrometers in length, with extraordinary aspect ratio (length/diameter greater than 22 300) and the number of pitches (more than 22 000 pitches). The pitch and width are uniform within each helix but vary widely among the helices. Crystal analyses showed that the facets, twin boundaries, grain sizes, and orientations are aperiodic along the helices. The apparent smooth curving is only possible with a large number of surface steps, suggesting that these structural features are the mere consequence of the helix formation rather than the cause. We propose that the nanowires are formed by the active surface growth mechanism and that the helicity originates from the random and asymmetrical blocking of nuclei embedded within the floccules of ligand complexes, in the form of either asymmetric binding of ligands or asymmetric diffusion of growth materials through the floccules. The separate growth environment of these nuclei causes constant helicity within each helix but differing helicity among the individuals. The embedding also provides a robust environment for the sustained growth of the nanohelices, leading to their record length and consistency.
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Affiliation(s)
- Yong Wang
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University , 637371 Singapore
- Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research) , #08-03, 2 Fusionopolis Way, Innovis, 138634 Singapore
| | - Jiating He
- Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research) , #08-03, 2 Fusionopolis Way, Innovis, 138634 Singapore
| | - Xiaoke Mu
- Institute of Nanotechnology and Karlsruhe Nano Micro Facility, Karlsruhe Institute of Technology , Karlsruhe 76021, Germany
| | - Di Wang
- Institute of Nanotechnology and Karlsruhe Nano Micro Facility, Karlsruhe Institute of Technology , Karlsruhe 76021, Germany
| | - Bowei Zhang
- School of Materials Science and Engineering, Nanyang Technological University , 639798 Singapore
| | - Youde Shen
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University , 637371 Singapore
| | - Ming Lin
- Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research) , #08-03, 2 Fusionopolis Way, Innovis, 138634 Singapore
| | - Christian Kübel
- Institute of Nanotechnology and Karlsruhe Nano Micro Facility, Karlsruhe Institute of Technology , Karlsruhe 76021, Germany
| | - Yizhong Huang
- School of Materials Science and Engineering, Nanyang Technological University , 639798 Singapore
| | - Hongyu Chen
- Institute of Advanced Synthesis (IAS), School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Centre for Advanced Materials, Nanjing Tech University , Nanjing 211816, P.R. China
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University , 637371 Singapore
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17
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Tian ZA, Dong KJ, Yu AB. Local rotational symmetry in the packing of uniform spheres. Phys Chem Chem Phys 2017; 19:14588-14595. [PMID: 28537304 DOI: 10.1039/c7cp01152k] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Local rotational symmetry (LRS) of a particulate system is important for understanding its structure and phase transition. However, how to properly characterize LRS for this system is still a challenge as the system normally includes both ordered and disordered local structures. Herein, based on the so-called common neighbour subcluster (CNS), we proposed a method to characterize the LRS of uniform spheres packings with the packing fraction ρ ranging within 0.20 and 0.74. It was found that different fold LRSs coexist in most packings, and their maximum degree increases at ρ < 0.64, except for the 2-fold LRS held by 6-sphere CNS that continuously increases to form the fcc crystal at ρ = 0.74. The overall LRS involving all the CNSs monotonically increases with two critical changes at ρ = (0.35-0.40) and 0.64; the evolution of individual LRSs held by specific CNS groups critically changes at ρ ≈ (0.35-0.40), 0.50, 0.55-0.60, and 0.64. The physics corresponding to these critical changes has also been discussed. The findings will significantly enrich the understanding of the structural symmetry of materials including atoms and particles.
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Affiliation(s)
- Z A Tian
- School of Physics and Electronics, Hunan University, Changsha 410082, China.
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18
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Ma W, Xu L, de Moura AF, Wu X, Kuang H, Xu C, Kotov NA. Chiral Inorganic Nanostructures. Chem Rev 2017; 117:8041-8093. [DOI: 10.1021/acs.chemrev.6b00755] [Citation(s) in RCA: 485] [Impact Index Per Article: 69.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
| | | | - André F. de Moura
- Department
of Chemistry, Federal University of São Carlos, CP 676, CEP 13.565-905, São Carlos, SP, Brazil
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19
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Chang F, Shan S, Petkov V, Skeete Z, Lu A, Ravid J, Wu J, Luo J, Yu G, Ren Y, Zhong CJ. Composition Tunability and (111)-Dominant Facets of Ultrathin Platinum–Gold Alloy Nanowires toward Enhanced Electrocatalysis. J Am Chem Soc 2016; 138:12166-75. [DOI: 10.1021/jacs.6b05187] [Citation(s) in RCA: 106] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Fangfang Chang
- Department
of Chemistry, State University of New York at Binghamton, Binghamton, New York 13902, United States
- College
of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
| | - Shiyao Shan
- Department
of Chemistry, State University of New York at Binghamton, Binghamton, New York 13902, United States
| | - Valeri Petkov
- Department
of Physics, Central Michigan University, Mt. Pleasant, Michigan 48859, United States
| | - Zakiya Skeete
- Department
of Chemistry, State University of New York at Binghamton, Binghamton, New York 13902, United States
| | - Aolin Lu
- Department
of Chemistry, State University of New York at Binghamton, Binghamton, New York 13902, United States
| | - Jonathan Ravid
- Department
of Chemistry, State University of New York at Binghamton, Binghamton, New York 13902, United States
| | - Jinfang Wu
- Department
of Chemistry, State University of New York at Binghamton, Binghamton, New York 13902, United States
| | - Jin Luo
- Department
of Chemistry, State University of New York at Binghamton, Binghamton, New York 13902, United States
| | - Gang Yu
- College
of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
| | - Yang Ren
- X-ray
Science Division, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Chuan-Jian Zhong
- Department
of Chemistry, State University of New York at Binghamton, Binghamton, New York 13902, United States
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20
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Ni B, Wang X. Chemistry and properties at a sub-nanometer scale. Chem Sci 2016; 7:3978-3991. [PMID: 30155040 PMCID: PMC6013797 DOI: 10.1039/c6sc00432f] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2016] [Accepted: 03/02/2016] [Indexed: 12/31/2022] Open
Abstract
Ultrathin materials at a sub-nanometer scale not only feature atomic scale size, but also possess unprecedented properties compared to conventional nanomaterials. The two aspects endow such materials with great potential. In sub-nanometric (SN) wires, the weak interactions may overwhelm the rigidity of inorganic compounds and dominate behaviours at this regime. Consequently intricate structures and polymer-like rheology can be obtained, shedding new light on chemistry as well as material design. As for 0D or 2D SN materials, clusters are analogous to molecules and SN sheets show unique electronic structures. Taking SN wire as an example, their growth mechanisms are discussed, as well as their applications and potentials. The chemistry at this regime can promote their application-oriented research, however, this is not yet well explored. In short, there is great potential at the sub-nanometer scale, although there are also many challenges ahead.
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Affiliation(s)
- Bing Ni
- Key Lab of Organic Optoelectronics and Molecular Engineering , Department of Chemistry , Tsinghua University , Beijing , 100084 , China .
| | - Xun Wang
- Key Lab of Organic Optoelectronics and Molecular Engineering , Department of Chemistry , Tsinghua University , Beijing , 100084 , China .
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21
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Mendoza-Cruz R, Bazán-Díaz L, Velázquez-Salazar JJ, Plascencia-Villa G, Bahena-Uribe D, Reyes-Gasga J, Romeu D, Guisbiers G, Herrera-Becerra R, José-Yacamán M. Helical Growth of Ultrathin Gold-Copper Nanowires. NANO LETTERS 2016; 16:1568-1573. [PMID: 26849249 DOI: 10.1021/acs.nanolett.5b04184] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
In this work, we report the synthesis and detailed structural characterization of novel helical gold-copper nanowires. The nanowires possess the Boerdijk-Coxeter-Bernal structure, based on the pile up of octahedral, icosahedral, and/or decahedral seeds. They are self-assembled into a coiled manner as individual wires or into a parallel-ordering way as groups of wires. The helical nanowires are ultrathin with a diameter of less than 10 nm and variable length of several micrometers, presenting a high density of twin boundaries and stacking faults. To the best of our knowledge, such gold-copper nanowires have never been reported previously.
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Affiliation(s)
- Rubén Mendoza-Cruz
- Instituto de Física, Universidad Nacional Autónoma de México , Circuito de la Investigación s/n, Coyoacán 04510, México Distrito Federal, México
- Department of Physics and Astronomy, The University of Texas at San Antonio , One UTSA Circle, San Antonio, Texas 78249, United States
| | - Lourdes Bazán-Díaz
- Instituto de Física, Universidad Nacional Autónoma de México , Circuito de la Investigación s/n, Coyoacán 04510, México Distrito Federal, México
- Department of Physics and Astronomy, The University of Texas at San Antonio , One UTSA Circle, San Antonio, Texas 78249, United States
| | - J Jesús Velázquez-Salazar
- Department of Physics and Astronomy, The University of Texas at San Antonio , One UTSA Circle, San Antonio, Texas 78249, United States
| | - Germán Plascencia-Villa
- Department of Physics and Astronomy, The University of Texas at San Antonio , One UTSA Circle, San Antonio, Texas 78249, United States
| | - Daniel Bahena-Uribe
- Advanced Laboratory of Electron Nanoscopy, Cinvestav , Av. Instituto Politecnico Nacional 2508, Col. San Pedro Zacatenco, Delegación Gustavo A. Madero, Mexico D.F. C.P. 07360, Mexico
| | - José Reyes-Gasga
- Instituto de Física, Universidad Nacional Autónoma de México , Circuito de la Investigación s/n, Coyoacán 04510, México Distrito Federal, México
| | - David Romeu
- Instituto de Física, Universidad Nacional Autónoma de México , Circuito de la Investigación s/n, Coyoacán 04510, México Distrito Federal, México
| | - Grégory Guisbiers
- Department of Physics and Astronomy, The University of Texas at San Antonio , One UTSA Circle, San Antonio, Texas 78249, United States
| | - Raúl Herrera-Becerra
- Instituto de Física, Universidad Nacional Autónoma de México , Circuito de la Investigación s/n, Coyoacán 04510, México Distrito Federal, México
| | - Miguel José-Yacamán
- Department of Physics and Astronomy, The University of Texas at San Antonio , One UTSA Circle, San Antonio, Texas 78249, United States
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22
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Zeng S, Du L, Huang M, Feng JX. Biological synthesis of Au nanoparticles using liquefied mash of cassava starch and their functionalization for enhanced hydrolysis of xylan by recombinant xylanase. Bioprocess Biosyst Eng 2016; 39:785-92. [PMID: 26864877 DOI: 10.1007/s00449-016-1558-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2016] [Accepted: 01/27/2016] [Indexed: 10/22/2022]
Abstract
Au nanoparticles (AuNPs) have shown the potential for a variety of applications due to their unique physical and chemical properties. In this study, a facile and affordable method for the synthesis of AuNPs via the liquefied mash of cassava starch has been described and the functionalized AuNPs by L-cysteine improved activity of recombinant xylanase was demonstrated. UV-Vis absorption spectroscopy, transmission electron microscopy, and zeta potential measurements were performed to characterize the AuNPs and monitor their synthesis. The presence of Au was confirmed by energy-dispersive X-ray spectroscopy (EDX) and the X-ray diffraction patterns showed that Au nanocrystals were face-centered cubic. The C=O stretching vibration in the Fourier transform infrared spectrum of AuNPs suggested that the hemiacetal C-OH of sugar molecules performed the reduction of Au³⁺ to Au⁰. The presence of C and O in the EDX spectrum and the negative zeta potential of AuNPs suggested that the biomolecules present in liquefied cassava mash were responsible for the stabilization of AuNPs. The surface of AuNPs was easily functionalized by L-cysteine, which improved the stability of AuNPs. Moreover, cysteine-functionalized AuNPs could significantly improve recombinant xylanase efficiency and stability.
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Affiliation(s)
- Sumei Zeng
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangxi University, 100 Daxue Road, Nanning, 530004, Guangxi, People's Republic of China.,College of Life Science and Technology, Guangxi University, 100 Daxue Road, Nanning, 530004, Guangxi, People's Republic of China
| | - Liangwei Du
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangxi University, 100 Daxue Road, Nanning, 530004, Guangxi, People's Republic of China.,College of Chemistry and Chemical Engineering, Guangxi University, 100 Daxue Road, Nanning, 530004, Guangxi, People's Republic of China
| | - Meiying Huang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangxi University, 100 Daxue Road, Nanning, 530004, Guangxi, People's Republic of China.,College of Chemistry and Chemical Engineering, Guangxi University, 100 Daxue Road, Nanning, 530004, Guangxi, People's Republic of China
| | - Jia-Xun Feng
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangxi University, 100 Daxue Road, Nanning, 530004, Guangxi, People's Republic of China. .,College of Life Science and Technology, Guangxi University, 100 Daxue Road, Nanning, 530004, Guangxi, People's Republic of China.
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23
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Song S, Wang X, Li S, Wang Z, Zhu Q, Zhang H. Pt nanohelices with highly ordered horizontal pore channels as enhanced photothermal materials. Chem Sci 2015; 6:6420-6424. [PMID: 28757957 PMCID: PMC5507185 DOI: 10.1039/c5sc01686j] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2015] [Accepted: 07/23/2015] [Indexed: 11/21/2022] Open
Abstract
Recent studies have further demonstrated that the conjugation of noble metal helical nanostructures could alter their optical and catalytic activities. However, the intrinsic isotropic crystal growth of Pt makes the synthesis of high-quality Pt NCs with unique porous or branched nanostructures difficult. In this work, a new, powerful capping agent, N,N-dimethyloctadecylammonium bromide acetate sodium, was synthesized and used to coordinate Pt ions, slowing down the reaction rate. As a result, in aqueous solution, Pt nanohelices with highly ordered horizontal pore channels were successfully fabricated. Importantly, the Pt nanohelices were composed of several sub-2 nm Pt nanowires coiled together around a central point. The as-obtained samples exhibited enhanced photothermal properties compared with the classic Pt nanoparticles.
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Affiliation(s)
- Shuyan Song
- State Key Laboratory of Rare Earth Resource Utilization , Changchun Institute of Applied Chemistry , Chinese Academy of Sciences , Changchun 130022 , P. R. China .
| | - Xiao Wang
- State Key Laboratory of Rare Earth Resource Utilization , Changchun Institute of Applied Chemistry , Chinese Academy of Sciences , Changchun 130022 , P. R. China .
| | - Sheling Li
- School of Material Science and Engineering , Changchun University of Science and Technology , Changchun , 130022 , P. R. China
| | - Zhuo Wang
- State Key Laboratory of Rare Earth Resource Utilization , Changchun Institute of Applied Chemistry , Chinese Academy of Sciences , Changchun 130022 , P. R. China .
| | - Qi Zhu
- School of Material Science and Engineering , Changchun University of Science and Technology , Changchun , 130022 , P. R. China
| | - Hongjie Zhang
- State Key Laboratory of Rare Earth Resource Utilization , Changchun Institute of Applied Chemistry , Chinese Academy of Sciences , Changchun 130022 , P. R. China .
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24
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Ni B, Wang X. Face the Edges: Catalytic Active Sites of Nanomaterials. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2015; 2:1500085. [PMID: 27980960 PMCID: PMC5115441 DOI: 10.1002/advs.201500085] [Citation(s) in RCA: 73] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2015] [Revised: 04/19/2015] [Indexed: 05/07/2023]
Abstract
Edges are special sites in nanomaterials. The atoms residing on the edges have different environments compared to those in other parts of a nanomaterial and, therefore, they may have different properties. Here, recent progress in nanomaterial fields is summarized from the viewpoint of the edges. Typically, edge sites in MoS2 or metals, other than surface atoms, can perform as active centers for catalytic reactions, so the method to enhance performance lies in the optimization of the edge structures. The edges of multicomponent interfaces present even more possibilities to enhance the activities of nanomaterials. Nanoframes and ultrathin nanowires have similarities to conventional edges of nanoparticles, the application of which as catalysts can help to reduce the use of costly materials. Looking beyond this, the edge structures of graphene are also essential for their properties. In short, the edge structure can influence many properties of materials.
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Affiliation(s)
- Bing Ni
- Department of Chemistry Tsinghua University Beijing 100084 P. R. China
| | - Xun Wang
- Department of Chemistry Tsinghua University Beijing 100084 P. R. China
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25
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Abstract
This study used a galvanic displacement reaction for aluminum-gold oxidation–reduction and added surfactants to act as capping agents to control the morphology and size of gold growth.
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Affiliation(s)
- Yu-Hsu Chang
- Department of Materials and Mineral Resources Engineering/Institute of Mineral Resources Engineering
- National Taipei University of Technology
- Taipei 10608
- Republic of China
| | - Yu-Chuan Wu
- Department of Materials and Mineral Resources Engineering/Institute of Mineral Resources Engineering
- National Taipei University of Technology
- Taipei 10608
- Republic of China
| | - Ya-Ting Hsu
- Department of Materials and Mineral Resources Engineering/Institute of Mineral Resources Engineering
- National Taipei University of Technology
- Taipei 10608
- Republic of China
| | - Shih-Hao Huang
- Department of Materials and Mineral Resources Engineering/Institute of Mineral Resources Engineering
- National Taipei University of Technology
- Taipei 10608
- Republic of China
| | - Yi-Chin Huang
- Department of Materials and Mineral Resources Engineering/Institute of Mineral Resources Engineering
- National Taipei University of Technology
- Taipei 10608
- Republic of China
| | - Hsin-Tien Chiu
- Department of Applied Chemistry
- National Chiao Tung University
- Hsinchu 300
- Republic of China
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26
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Zhu Y, He J, Shang C, Miao X, Huang J, Liu Z, Chen H, Han Y. Chiral gold nanowires with Boerdijk-Coxeter-Bernal structure. J Am Chem Soc 2014; 136:12746-52. [PMID: 25126894 DOI: 10.1021/ja506554j] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
A Boerdijk-Coxeter-Bernal (BCB) helix is made of linearly stacked regular tetrahedra (tetrahelix). As such, it is chiral without nontrivial translational or rotational symmetries. We demonstrate here an example of the chiral BCB structure made of totally symmetrical gold atoms, created in nanowires by direct chemical synthesis. Detailed study by high-resolution electron microscopy illustrates their elegant chiral structure and the unique one-dimensional "pseudo-periodicity". The BCB-type atomic packing mode is proposed to be a result of the competition and compromise between the lattice and surface energy.
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Affiliation(s)
- Yihan Zhu
- Advanced Membranes and Porous Materials Center, Physical Sciences and Engineering Division and ∥Catalysis Research Center, King Abdullah University of Science and Technology , Thuwal 23955-6900, Saudi Arabia
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27
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Doan-Nguyen VVT, Kimber SAJ, Pontoni D, Reifsnyder Hickey D, Diroll BT, Yang X, Miglierini M, Murray CB, Billinge SJL. Bulk metallic glass-like scattering signal in small metallic nanoparticles. ACS NANO 2014; 8:6163-70. [PMID: 24871305 DOI: 10.1021/nn501591g] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
The atomic structure of Ni-Pd nanoparticles has been studied using atomic pair distribution function (PDF) analysis of X-ray total scattering data and with transmission electron microscopy (TEM). Larger nanoparticles have PDFs corresponding to the bulk face-centered cubic packing. However, the smallest nanoparticles have PDFs that strongly resemble those obtained from bulk metallic glasses (BMGs). In fact, by simply scaling the distance axis by the mean metallic radius, the curves may be collapsed onto each other and onto the PDF from a metallic glass sample. In common with a wide range of BMG materials, the intermediate range order may be fit with a damped single-frequency sine wave. When viewed in high-resolution TEM, these nanoparticles exhibit atomic fringes typical of those seen in small metallic clusters with icosahedral or decahedral order. These two seemingly contradictory results are reconciled by calculating the PDFs of models of icosahedra that would be consistent with the fringes seen in TEM. These model PDFs resemble the measured ones when significant atom-position disorder is introduced, drawing together the two diverse fields of metallic nanoparticles and BMGs and supporting the view that BMGs may contain significant icosahedral or decahedral order.
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Affiliation(s)
- Vicky V T Doan-Nguyen
- Department of Materials Science and Engineering, University of Pennsylvania , Philadelphia, Pennsylvania 19104, United States
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28
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Hong X, Yin Z, Fan Z, Tay YY, Chen J, Du Y, Xue C, Chen H, Zhang H. Periodic AuAg-Ag₂S heterostructured nanowires. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2014; 10:479-482. [PMID: 24106200 DOI: 10.1002/smll.201302304] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2013] [Indexed: 06/02/2023]
Affiliation(s)
- Xun Hong
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
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29
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Yang HJ, He SY, Tuan HY. Self-seeded growth of five-fold twinned copper nanowires: mechanistic study, characterization, and SERS applications. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:602-610. [PMID: 24367924 DOI: 10.1021/la4036198] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A comprehensive mechanistic study conducted on the formation mechanism of five-fold twinned copper nanowires by heating copper(I) chloride with oleylamine at 170 °C is presented. Electron microscopy and UV-visible absorption spectra are used to analyze the growth mechanism of copper nanowires. High-resolution transmission electron microscopy and selected-area electron diffraction are used to investigate the detailed structure of copper nanowires and nanoparticles, and a five-twinned structure is shown to exist in the copper nanowires and nanoparticles. Additionally, experiments have been performed to indirectly confirm that oleylamine preferentially adsorbs on the {100} facets of growing crystals. On the basis of the above results, the self-seeded growth of copper nanowires is confirmed. In the initial stage of reactions, copper nanoparticles with two distinctive sizes are formed. As the reaction proceeds, larger five-twinned copper nanoparticles serve as seeds for anisotropic crystal growth. Further, copper atoms generated from an Ostwald ripening process or reduction reactions of a copper(I) chloride-oleylamine complex continue to deposit and crystallize on the twin boundaries. Once the {110} planes are generated, oleylamine preferentially adsorbs on the newly formed {100} facets and then guides the formation of nanowires. The electrical resistivity of a single copper nanowire is measured to be 41.25 nΩ-m, which is of the same order of magnitude as the value of bulk copper (16.78 nΩ-m). Finally, an effective surface-enhanced Raman spectroscopy active substrate made of copper nanowire is used to detect the 4-mercaptobenzoic acid molecules.
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Affiliation(s)
- Hong-Jie Yang
- Department of Chemical Engineering, National Tsing Hua University , 101, Section 2, Kuang-Fu Road, Hsinchu, Taiwan 30013, Republic of China
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30
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Heard CJ, Johnston RL. A theoretical study of the structures and optical spectra of helical copper–silver clusters. Phys Chem Chem Phys 2014; 16:21039-48. [DOI: 10.1039/c3cp55507k] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Optical response spectra of AgnCu13−n+ Bernal spiral clusters show subtle variations by dopant site and loading. Comparison to nanorod-like and icosahedral clusters shows local geometry plays a significant role in electronic transitions at the sub-nanoscale.
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31
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Abstract
Ultrathin nanostructures possess the very essential features of nanomaterials, including quantum-confinement effects and unconventional reactivities, which are determined by the significant structure variations from the bulk material. More and more isolated reports on ultrathin nanostructures and various new phenomena have appeared in recent years but a comprehensive review on their typical features and future development has not followed. Here we aim to present a well-organized review which comments on the most important characteristics of non-carbon ultrathin nanostructures, in an attemp to reveal the underlying relationship between their reactivity, stability and transformation law, and their structures.
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Affiliation(s)
- Shi Hu
- Department of Chemistry, Tsinghua University, Beijing, 100084, P. R. China
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32
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Borbón-González DJ, Fortunelli A, Barcaro G, Sementa L, Johnston RL, Posada-Amarillas A. Global Minimum Pt13M20 (M = Ag, Au, Cu, Pd) Dodecahedral Core–Shell Clusters. J Phys Chem A 2013; 117:14261-6. [DOI: 10.1021/jp410079t] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Dora J. Borbón-González
- Departamento de Matemáticas, Universidad de Sonora, Blvd. Luis Encinas & Rosales, 83000 Hermosillo, Sonora, México
| | | | - Giovanni Barcaro
- CNR, Consiglio Nazionale delle Ricerche, v. G. Moruzzi 1, Pisa 56124, Italy
| | - Luca Sementa
- CNR, Consiglio Nazionale delle Ricerche, v. G. Moruzzi 1, Pisa 56124, Italy
| | - Roy L. Johnston
- School
of Chemistry, University of Birmingham, Edgbaston, B15 2TT Birmingham, United Kingdom
| | - Alvaro Posada-Amarillas
- Departamento de Investigación en Física, Universidad de Sonora, Blvd. Luis Encinas & Rosales, 83000 Hermosillo, Sonora, México
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33
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Abstract
Chirality in nanoscience may offer new opportunities for applications beyond the traditional fields of chirality, such as the asymmetric catalysts in the molecular world and the chiral propellers in the macroscopic world. In the last two decades, there has been an amazing array of chiral nanostructures reported in the literature. This review aims to explore and categorize the common mechanisms underlying these systems. We start by analyzing the origin of chirality in simple systems such as the helical spring and hair vortex. Then, the chiral nanostructures in the literature were categorized according to their material composition and underlying mechanism. Special attention is paid to highlight systems with original discoveries, exceptional structural characteristics, or unique mechanisms.
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Affiliation(s)
- Yong Wang
- Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore
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34
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Plascencia-Villa G, Bahena D, Rodríguez AR, Ponce A, José-Yacamán M. Advanced microscopy of star-shaped gold nanoparticles and their adsorption-uptake by macrophages. Metallomics 2013; 5:242-50. [PMID: 23443314 DOI: 10.1039/c3mt20202j] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Metallic nanoparticles have diverse applications in biomedicine, as diagnostics, image contrast agents, nanosensors and drug delivery systems. Anisotropic metallic nanoparticles possess potential applications in cell imaging and therapy + diagnostics (theranostics), but controlled synthesis and growth of these anisotropic or branched nanostructures has been challenging and usually require use of high concentrations of surfactants. Star-shaped gold nanoparticles were synthesized in high yield through a seed mediated route using HEPES as a precise shape-directing capping agent. Characterization was performed using advanced electron microscopy techniques including atomic resolution TEM, obtaining a detailed characterization of nanostructure and atomic arrangement. Spectroscopy techniques showed that the particles have narrow size distribution, monodispersity and high colloidal stability, with absorbance into NIR region and high efficiency for SERS applications. Gold nanostars showed to be biocompatible and efficiently adsorbed and internalized by macrophages, as revealed by advanced FE-SEM and backscattered electron imaging techniques of complete unstained uncoated cells. Additionally, low voltage STEM and X-ray microanalysis revealed the ultra-structural location and confirmed stability of nanoparticles after endocytosis with high spatial resolution.
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Affiliation(s)
- Germán Plascencia-Villa
- Department of Physics and Astronomy, The University of Texas at San Antonio (UTSA), San Antonio, TX 78249, USA.
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35
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Xia B, He F, Li L. Preparation of bimetallic nanoparticles using a facile green synthesis method and their application. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:4901-4907. [PMID: 23517530 DOI: 10.1021/la400355u] [Citation(s) in RCA: 92] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A straightforward, economically viable, and green approach for the synthesis of well-stabilized Au/Ag bimetallic nanoparticles is described; this method uses nontoxic and renewable degraded pueraria starch (DPS) as a matrix and mild reaction conditions. The DPS acted as both a reducing agent and a capping agent for the bimetallic nanoparticles. Au/Ag bimetallic nanoparticles were successfully grown within the DPS matrixes, and the bimetallic structures were characterized using various methods, including high-resolution transmission electron microscopy, energy-dispersive X-ray, and X-ray diffraction. Moreover, it was shown that these DPS-capped Au/Ag bimetallic nanoparticles could function as catalysts for the reduction of 4-nitrophenol in the presence of NaBH4 and were more effective than Au or Ag monometallic nanoparticles.
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Affiliation(s)
- Bihua Xia
- State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, P R China
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36
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Guo T, Tan Y. Formation of one-dimensional Ag-Au solid solution colloids with Au nanorods as seeds, their alloying mechanisms, and surface plasmon resonances. NANOSCALE 2013; 5:561-569. [PMID: 23149628 DOI: 10.1039/c2nr32862c] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
In this work, one dimensional (1D) Ag-Au solid solution nanoalloys were synthesized by rapidly diffusing Ag into the preformed Au nanorod (AuNR) seeds at ambient temperature in aqueous solution. By varying the molar ratio of AgCl/AuNR (in gold atoms), two kinds of 1D Ag-Au alloy nanostructures with a narrow size distribution--AgAu nanowires and Ag(33)Au(67) nanorods--could be obtained in high yields when NaCl and polyvinylpyrrolidone (PVP) were used as an additive and capping reagent, respectively. Based on HRTEM imaging combined with a series of control experiments, it is conceivable that vacancy/defect-motivated interdiffusion of Ag and Au atoms coupled with oxidative etching is a crucial stage in the mechanism responsible for this room-temperature alloying process, and the subsequent conjugation of the fused Ag-Au alloyed nanostructures is associated with the formation of the AgAu nanowires. The resulting 1D Ag-Au nanoalloys form stable colloidal dispersions and show unique localized surface plasmon resonance (LSPR) peaks in the ensemble extinction spectra.
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Affiliation(s)
- Tao Guo
- State Key Laboratory of Materials-Oriented Chemical Engineering, School of Chemistry and Chemical Engineering, Nanjing University of Technology, Nanjing 210009, China
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37
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Pacheco-Contreras R, Borbón-González DJ, Dessens-Félix M, Paz-Borbón LO, Johnston RL, Schön JC, Jansen M, Posada-Amarillas A. Determination of the energy landscape of Pd12Pt1 using a combined genetic algorithm and threshold energy method. RSC Adv 2013. [DOI: 10.1039/c3ra41477a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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38
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Pacheco-Contreras R, Dessens-Félix M, Borbón-González DJ, Paz-Borbón LO, Johnston RL, Schön JC, Posada-Amarillas A. Tetrahelix Conformations and Transformation Pathways in Pt1Pd12 Clusters. J Phys Chem A 2012; 116:5235-9. [DOI: 10.1021/jp3023925] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Rafael Pacheco-Contreras
- Departamento de Investigación
en Física, Universidad de Sonora, Apdo. Postal 5-088, 83190 Hermosillo, Sonora, México
| | - Maribel Dessens-Félix
- Programa de Doctorado en Ciencias
de Materiales, Universidad de Sonora, 83000
Hermosillo, Sonora, México
| | | | - L. Oliver Paz-Borbón
- Department of Applied Physics
and Competence Centre for Catalysis, Chalmers University of Technology, SE-412 96 Göteborg, Sweden
| | - Roy L. Johnston
- School of Chemistry, University of Birmingham, Edgbaston, B15 2TT Birmingham,
U.K
| | - J. Christian Schön
- Max-Planck Institute for Solid State Research, Heisenbergstrasse 1, D-70569
Stuttgart, Germany
| | - Alvaro Posada-Amarillas
- Departamento de Investigación
en Física, Universidad de Sonora, Apdo. Postal 5-088, 83190 Hermosillo, Sonora, México
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39
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Iacovella CR, French WR, Cook BG, Kent PRC, Cummings PT. Role of polytetrahedral structures in the elongation and rupture of gold nanowires. ACS NANO 2011; 5:10065-10073. [PMID: 22040227 DOI: 10.1021/nn203941r] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We report comprehensive high-accuracy molecular dynamics simulations using the ReaxFF force field to explore the structural changes that occur as Au nanowires are elongated, establishing trends as a function of both temperature and nanowire diameter. Our simulations and subsequent quantitative structural analysis reveal that polytetrahedral structures (e.g., icosahedra) form within the "amorphous" neck regions, most prominently for systems with small diameter at high temperature. We demonstrate that the formation of polytetrahedra diminishes the conductance quantization as compared to systems without this structural motif. We demonstrate that use of the ReaxFF force field, fitted to high-accuracy first-principles calculations of Au, combines the accuracy of quantum calculations with the speed of semiempirical methods.
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Affiliation(s)
- Christopher R Iacovella
- Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, Tennessee 37235-1604, United States
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40
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Wang Y, Wang Q, Sun H, Zhang W, Chen G, Wang Y, Shen X, Han Y, Lu X, Chen H. Chiral Transformation: From Single Nanowire to Double Helix. J Am Chem Soc 2011; 133:20060-3. [DOI: 10.1021/ja208121c] [Citation(s) in RCA: 88] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yong Wang
- Division of Chemistry and Biological Chemistry, Nanyang Technological University, Singapore 637371
| | - Qingxiao Wang
- Advanced Membranes and Porous Materials Center & Core Lab of Imaging and Characterization, King Abdullah University of Science and Technology, Saudi Arabia 23955-6900
| | - Hang Sun
- Division of Chemistry and Biological Chemistry, Nanyang Technological University, Singapore 637371
| | - Weiqing Zhang
- Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore 117576
| | - Gang Chen
- Division of Chemistry and Biological Chemistry, Nanyang Technological University, Singapore 637371
| | - Yawen Wang
- Division of Chemistry and Biological Chemistry, Nanyang Technological University, Singapore 637371
| | - Xiaoshuang Shen
- Division of Chemistry and Biological Chemistry, Nanyang Technological University, Singapore 637371
| | - Yu Han
- Advanced Membranes and Porous Materials Center & Core Lab of Imaging and Characterization, King Abdullah University of Science and Technology, Saudi Arabia 23955-6900
| | - Xianmao Lu
- Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore 117576
| | - Hongyu Chen
- Division of Chemistry and Biological Chemistry, Nanyang Technological University, Singapore 637371
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