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Googasian JS, Skrabalak SE. Practical Considerations for Simulating the Plasmonic Properties of Metal Nanoparticles. ACS PHYSICAL CHEMISTRY AU 2023; 3:252-262. [PMID: 37249938 PMCID: PMC10214510 DOI: 10.1021/acsphyschemau.2c00064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Revised: 01/25/2023] [Accepted: 01/25/2023] [Indexed: 05/31/2023]
Abstract
Simulating the plasmonic properties of colloidally derived metal nanoparticles with accuracy to their experimentally observed measurements is challenging due to the many structural and compositional parameters that influence their scattering and absorption properties. Correlation between single nanoparticle scattering measurements and simulated spectra emphasize these strong structural and compositional relationships, providing insight into the design of plasmonic nanoparticles. This Perspective builds from this history to highlight how the structural features of models used in simulation methods such as those based on the Finite-Difference Time-Domain (FDTD) method and Discrete Dipole Approximation (DDA) are of critical consideration for correlation with experiment and ultimately prediction of new nanoparticle properties. High-level characterizations such as electron tomography are discussed as ways to advance the accuracy of models used in such simulations, allowing the plasmonic properties of structurally complex nanoparticles to be better understood. However, we also note that the field is far from bringing experiment and simulation into agreement for plasmonic nanoparticles with complex compositions, reflecting analytical challenges that inhibit accurate model generation. Potential directions for addressing these challenges are also presented.
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2
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Sundarapandi M, Shanmugam S, Ramaraj R. Synthesis of Different Nano‐layer Shells (Mono‐, Bi‐, and Alloy Layers)‐Coated Gold Spherical Nanoparticles Core for Catalysis. ChemistrySelect 2023. [DOI: 10.1002/slct.202203389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/15/2023]
Affiliation(s)
- Manickam Sundarapandi
- School of Chemistry, Centre for Photoelectrochemistry Madurai Kamaraj University Madurai 625021 India
| | - Sivakumar Shanmugam
- Department of Organic Chemistry, School of Chemistry Madurai Kamaraj University Madurai 625021 India
| | - Ramasamy Ramaraj
- School of Chemistry, Centre for Photoelectrochemistry Madurai Kamaraj University Madurai 625021 India
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3
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Jenkinson K, Liz-Marzán LM, Bals S. Multimode Electron Tomography Sheds Light on Synthesis, Structure, and Properties of Complex Metal-Based Nanoparticles. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2110394. [PMID: 35438805 DOI: 10.1002/adma.202110394] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Revised: 03/24/2022] [Indexed: 06/14/2023]
Abstract
Electron tomography has become a cornerstone technique for the visualization of nanoparticle morphology in three dimensions. However, to obtain in-depth information about a nanoparticle beyond surface faceting and morphology, different electron microscopy signals must be combined. The most notable examples of these combined signals include annular dark-field scanning transmission electron microscopy (ADF-STEM) with different collection angles and the combination of ADF-STEM with energy-dispersive X-ray or electron energy loss spectroscopies. Here, the experimental and computational development of various multimode tomography techniques in connection to the fundamental materials science challenges that multimode tomography has been instrumental to overcoming are summarized. Although the techniques can be applied to a wide variety of compositions, the study is restricted to metal and metal oxide nanoparticles for the sake of simplicity. Current challenges and future directions of multimode tomography are additionally discussed.
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Affiliation(s)
- Kellie Jenkinson
- EMAT and NANOlab Center of Excellence, University of Antwerp, Antwerp, 2020, Belgium
| | - Luis M Liz-Marzán
- CIC biomaGUNE, Basque Research and Technology Alliance (BRTA), Donostia-San Sebastián, 20014, Spain
- Centro de Investigación Biomédica en Red de Bioingeniería Biomateriales, y Nanomedicina (CIBER-BBN), Donostia-San Sebastián, 20014, Spain
- Ikerbasque, Basque Foundation for Science, Bilbao, 48009, Spain
| | - Sara Bals
- EMAT and NANOlab Center of Excellence, University of Antwerp, Antwerp, 2020, Belgium
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4
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Bell CG, Treder KP, Kim JS, Schuster ME, Kirkland AI, Slater TJA. Trainable Segmentation for Transmission Electron Microscope Images of Inorganic Nanoparticles. J Microsc 2022; 288:169-184. [PMID: 35502816 PMCID: PMC10084002 DOI: 10.1111/jmi.13110] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Revised: 04/01/2022] [Accepted: 04/26/2022] [Indexed: 11/28/2022]
Abstract
We present a trainable segmentation method implemented within the python package ParticleSpy. The method takes user labelled pixels, which are used to train a classifier and segment images of inorganic nanoparticles from transmission electron microscope images. This implementation is based on the trainable Waikato Environment for Knowledge Analysis (WEKA) segmentation, but is written in python, allowing a large degree of flexibility and meaning it can be easily expanded using other python packages. We find that trainable segmentation offers better accuracy than global or local thresholding methods and requires as few as 100 user-labelled pixels to produce an accurate segmentation. Trainable segmentation presents a balance of accuracy and training time between global/local thresholding and neural networks, when used on transmission electron microscope images of nanoparticles. We also quantitatively investigate the effectiveness of the components of trainable segmentation, its filter kernels and classifiers, in order to demonstrate the use cases for the different filter kernels in ParticleSpy and the most accurate classifiers for different data types. A set of filter kernels is identified that are effective in distinguishing particles from background but that retain dissimilar features. In terms of classifiers, we find that different classifiers perform optimally for different image contrast; specifically, a Random Forest classifier performs best for high-contrast ADF images, but that QDA and Gaussian Naïve Bayes classifiers perform better for low-contrast TEM images. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Cameron G Bell
- Electron Physical Sciences Imaging Centre, Diamond Light Source, Oxfordshire, OX11 0DE, UK
| | - Kevin P Treder
- Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, UK
| | - Judy S Kim
- Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, UK.,The Rosalind Franklin Institute, Harwell Science and Innovation Campus, Didcot, OX11 0FA, UK
| | - Manfred E Schuster
- Johnson Matthey Technology Centre, Blount's Court, Sonning Common, Reading, RG4 9NH, UK
| | - Angus I Kirkland
- Electron Physical Sciences Imaging Centre, Diamond Light Source, Oxfordshire, OX11 0DE, UK.,Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, UK.,The Rosalind Franklin Institute, Harwell Science and Innovation Campus, Didcot, OX11 0FA, UK
| | - Thomas J A Slater
- Electron Physical Sciences Imaging Centre, Diamond Light Source, Oxfordshire, OX11 0DE, UK.,School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, UK
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5
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Noble Metal Promoted TiO2 from Silver-Waste Valorisation: Synergism between Ag and Au. Catalysts 2022. [DOI: 10.3390/catal12020235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Wastewaters from precious metal industries contain high amounts of noble metals, but their efficient recycling is hindered by the wastewater complex composition. Here, we propose an innovative approach for the efficient recovery of noble metals contained in these metal-enriched wastewaters as precursors for the synthesis of noble metal nanoparticles (NPs) and supported metal catalysts. Silver NPs were synthesized from Ag-enriched wastewater and then deposited on TiO2 to prepare photocatalysts. Then, further promotion of the photocatalytic activity of Ag-modified TiO2 was achieved by the addition of as little as 0.5 wt.% of Au. STEM-EDS analyses proved that Au NPs were located on Ag or AgOx nanoparticles. The contact between the two metal-containing NPs results in charge transfer effects, appreciable both in terms of oxidation states determined by XPS and of optical properties. In particular, the plasmon band of Au NPs shows photochromic effects: under UV light irradiation, bimetallic samples exhibit a blue-shift of the plasmon band, which is reversible under dark storage. The activity of the materials was tested towards ethanol photodegradation under UV light. Adding 0.5 wt.% Au NPs resulted in a promoted activity compared to Ag-TiO2, thus showing synergistic effects between Au and Ag. Ethanol was completely converted already after 1 h of UV irradiation, acetaldehyde was formed as the main oxidation product and fully degraded in less than 180 min. Notably, bimetallic samples showed ethylene formation by a parallel dehydration mechanism.
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6
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da Silva RTP, Córdoba De Torresi SI, de Oliveira PFM. Mechanochemical Strategies for the Preparation of SiO2-Supported AgAu Nanoalloy Catalysts. Front Chem 2022; 10:836597. [PMID: 35186886 PMCID: PMC8847606 DOI: 10.3389/fchem.2022.836597] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Accepted: 01/05/2022] [Indexed: 11/18/2022] Open
Abstract
Silver-gold nanoalloys were prepared from their metal salts precursors through bottom-up mechanochemical synthesis, using one-pot or galvanic replacement reaction strategies. The nanostructures were prepared over amorphous SiO2 as an inert supporting material, facilitating their stabilization without the use of any stabilizing agent. The nanomaterials were extensively characterized, confirming the formation of the bimetallic nanostructures. The nanoalloys were tested as catalysts in the hydrogenation of 2-nitroaniline and exhibited up to 4-fold the rate constant and up to 37% increased conversion compared to the respective single metal nanoparticles. Our approach is advantageous to produce nanoparticles with clean surfaces with available catalytic sites, directly in the solid-state and in an environmentally friendly manner.
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7
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Ye Z, Li C, Celentano M, Lindley M, O’Reilly T, Greer AJ, Huang Y, Hardacre C, Haigh SJ, Xu Y, Bell SEJ. Surfactant-free Synthesis of Spiky Hollow Ag-Au Nanostars with Chemically Exposed Surfaces for Enhanced Catalysis and Single-Particle SERS. JACS AU 2022; 2:178-187. [PMID: 35098234 PMCID: PMC8791058 DOI: 10.1021/jacsau.1c00462] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Indexed: 06/14/2023]
Abstract
Spiky/hollow metal nanoparticles have applications across a broad range of fields. However, the current bottom-up methods for producing spiky/hollow metal nanoparticles rely heavily on the use of strongly adsorbing surfactant molecules, which is undesirable because these passivate the product particles' surfaces. Here we report a high-yield surfactant-free synthesis of spiky hollow Au-Ag nanostars (SHAANs). Each SHAAN is composed of >50 spikes attached to a hollow ca. 150 nm diameter cubic core, which makes SHAANs highly plasmonically and catalytically active. Moreover, the surfaces of SHAANs are chemically exposed, which gives them significantly enhanced functionality compared with their surfactant-capped counterparts, as demonstrated in surface-enhanced Raman spectroscopy (SERS) and catalysis. The chemical accessibility of the pristine SHAANs also allows the use of hydroxyethyl cellulose as a weakly bound stabilizing agent. This produces colloidal SHAANs that remain stable for >1 month while retaining the functionalities of the pristine particles and allows even single-particle SERS to be realized.
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Affiliation(s)
- Ziwei Ye
- School
of Chemistry and Chemical Engineering, Queen’s
University of Belfast, University Road, Belfast BT9 5AG, Northern Ireland, United Kingdom
| | - Chunchun Li
- School
of Chemistry and Chemical Engineering, Queen’s
University of Belfast, University Road, Belfast BT9 5AG, Northern Ireland, United Kingdom
| | - Maurizio Celentano
- School
of Chemistry and Chemical Engineering, Queen’s
University of Belfast, University Road, Belfast BT9 5AG, Northern Ireland, United Kingdom
| | - Matthew Lindley
- Department
of Materials, The University of Manchester, Oxford Road, Manchester M13 9PL, United
Kingdom
| | - Tamsin O’Reilly
- School
of Chemistry and Chemical Engineering, Queen’s
University of Belfast, University Road, Belfast BT9 5AG, Northern Ireland, United Kingdom
| | - Adam J. Greer
- Department
of Chemical Engineering & Analytical Science, The University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - Yiming Huang
- School
of Chemistry and Chemical Engineering, Queen’s
University of Belfast, University Road, Belfast BT9 5AG, Northern Ireland, United Kingdom
| | - Christopher Hardacre
- Department
of Chemical Engineering & Analytical Science, The University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - Sarah J. Haigh
- Department
of Materials, The University of Manchester, Oxford Road, Manchester M13 9PL, United
Kingdom
| | - Yikai Xu
- School
of Chemistry and Chemical Engineering, Queen’s
University of Belfast, University Road, Belfast BT9 5AG, Northern Ireland, United Kingdom
| | - Steven E. J. Bell
- School
of Chemistry and Chemical Engineering, Queen’s
University of Belfast, University Road, Belfast BT9 5AG, Northern Ireland, United Kingdom
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8
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Skorikov A, Heyvaert W, Albecht W, Pelt DM, Bals S. Deep learning-based denoising for improved dose efficiency in EDX tomography of nanoparticles. NANOSCALE 2021; 13:12242-12249. [PMID: 34241619 DOI: 10.1039/d1nr03232a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The combination of energy-dispersive X-ray spectroscopy (EDX) and electron tomography is a powerful approach to retrieve the 3D elemental distribution in nanomaterials, providing an unprecedented level of information for complex, multi-component systems, such as semiconductor devices, as well as catalytic and plasmonic nanoparticles. Unfortunately, the applicability of EDX tomography is severely limited because of extremely long acquisition times and high electron irradiation doses required to obtain 3D EDX reconstructions with an adequate signal-to-noise ratio. One possibility to address this limitation is intelligent denoising of experimental data using prior expectations about the objects of interest. Herein, this approach is followed using the deep learning methodology, which currently demonstrates state-of-the-art performance for an increasing number of data processing problems. Design choices for the denoising approach and training data are discussed with a focus on nanoparticle-like objects and extremely noisy signals typical for EDX experiments. Quantitative analysis of the proposed method demonstrates its significantly enhanced performance in comparison to classical denoising approaches. This allows for improving the tradeoff between the reconstruction quality, acquisition time and radiation dose for EDX tomography. The proposed method is therefore especially beneficial for the 3D EDX investigation of electron beam-sensitive materials and studies of nanoparticle transformations.
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Affiliation(s)
- Alexander Skorikov
- EMAT, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium.
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9
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Slater TJA, Wang YC, Leteba GM, Quiroz J, Camargo PHC, Haigh SJ, Allen CS. Automated Single-Particle Reconstruction of Heterogeneous Inorganic Nanoparticles. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2020; 26:1168-1175. [PMID: 33176893 DOI: 10.1017/s1431927620024642] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Single-particle reconstruction can be used to perform three-dimensional (3D) imaging of homogeneous populations of nano-sized objects, in particular viruses and proteins. Here, it is demonstrated that it can also be used to obtain 3D reconstructions of heterogeneous populations of inorganic nanoparticles. An automated acquisition scheme in a scanning transmission electron microscope is used to collect images of thousands of nanoparticles. Particle images are subsequently semi-automatically clustered in terms of their properties and separate 3D reconstructions are performed from selected particle image clusters. The result is a 3D dataset that is representative of the full population. The study demonstrates a methodology that allows 3D imaging and analysis of inorganic nanoparticles in a fully automated manner that is truly representative of large particle populations.
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Affiliation(s)
- Thomas J A Slater
- Electron Physical Sciences Imaging Centre, Diamond Light Source Ltd., OxfordshireOX11 0DE, UK
| | - Yi-Chi Wang
- School of Materials, University of Manchester, Oxford Road, ManchesterM13 9PL, UK
- Chinese Academy of Sciences, Beijing Institute of Nanoengergy and Nanosystems, Beijing100083, P.R. China
| | - Gerard M Leteba
- Department of Chemical Engineering, Catalysis Institute, University of Cape Town, Rondebosch7701, South Africa
| | - Jhon Quiroz
- Department of Chemistry, University of Helsinki, A.I. Virtasen aukio 1, Helsinki, Finland
| | - Pedro H C Camargo
- Department of Chemistry, University of Helsinki, A.I. Virtasen aukio 1, Helsinki, Finland
| | - Sarah J Haigh
- School of Materials, University of Manchester, Oxford Road, ManchesterM13 9PL, UK
| | - Christopher S Allen
- Electron Physical Sciences Imaging Centre, Diamond Light Source Ltd., OxfordshireOX11 0DE, UK
- Department of Materials, University of Oxford, Parks Road, OxfordOX1 3PH, UK
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10
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Liao S, Luo Z, Metternich JB, Zenobi R, Stellacci F. Quantification of surface composition and segregation on AuAg bimetallic nanoparticles by MALDI MS. NANOSCALE 2020; 12:22639-22644. [PMID: 33151213 DOI: 10.1039/d0nr05061j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
In this work we show that it is possible to use MALDI-TOF as a tool to quantify the atomic composition and to describe the phase segragation of the surface of ligand-coated, bimetallic AuAg nanoparticles. Our investigation shows that AuAg nanoparticles of various compositions exhibit core-shell heterogeneity with surface enrichment of Ag. A Monte-Carlo type simulation demonstrates that the surface Au and Ag atoms arrange in a random fashion.
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Affiliation(s)
- Suiyang Liao
- Institute of Materials, École Polytechnique Fédérale de Lausanne, Station 12, 1015 Lausanne, Switzerland.
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12
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Synthesis of Au, Ag, and Au-Ag Bimetallic Nanoparticles Using Pulicaria undulata Extract and Their Catalytic Activity for the Reduction of 4-Nitrophenol. NANOMATERIALS 2020; 10:nano10091885. [PMID: 32962292 PMCID: PMC7559643 DOI: 10.3390/nano10091885] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/08/2020] [Revised: 09/12/2020] [Accepted: 09/16/2020] [Indexed: 12/12/2022]
Abstract
Plant extract of Pulicaria undulata (L.) was used as both reducing agent and stabilizing ligand for the rapid and green synthesis of gold (Au), silver (Ag), and gold–silver (Au–Ag) bimetallic (phase segregated/alloy) nanoparticles (NPs). These nanoparticles with different morphologies were prepared in two hours by stirring corresponding metal precursors in the aqueous solution of the plant extracts at ambient temperature. To infer the role of concentration of plant extract on the composition and morphology of NPs, we designed two different sets of experiments, namely (i) low concentration (LC) and (ii) high concentration (HC) of plant extract. In the case of using low concentration of the plant extract, irregular shaped Au, Ag, or phase segregated Au–Ag bimetallic NPs were obtained, whereas the use of higher concentrations of the plant extract resulted in the formation of spherical Au, Ag, and Au–Ag alloy NPs. The as-prepared Au, Ag, and Au–Ag bimetallic NPs showed morphology and composition dependent catalytic activity for the reduction of 4-nitrophenol (4-NPh) to 4-aminophenol (4-APh) in the presence of NaBH4. The bimetallic Au–Ag alloy NPs showed the highest catalytic activity compared to all other NPs.
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Jena P, Bhattacharya M, Bhattacharjee G, Satpati B, Mukherjee P, Senapati D, Srinivasan R. Bimetallic gold-silver nanoparticles mediate bacterial killing by disrupting the actin cytoskeleton MreB. NANOSCALE 2020; 12:3731-3749. [PMID: 31993609 DOI: 10.1039/c9nr10700b] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The actin cytoskeleton is required for the maintenance of the cell shape and viability of bacteria. It remains unknown to which extent nanoparticles (NPs) can orchestrate the mechanical instability by disrupting the cytoskeletal network in bacterial cells. Our work demonstrates that Au-Ag NPs disrupt the bacterial actin cytoskeleton specifically, fluidize the inner membrane and lead to killing of bacterial cells. In this study, we have tried to emphasize on the key parameters important for NP-cell interactions and found that the shape, specific elemental surface localization and enhanced electrostatic interaction developed due to the acquired partial positive charge by silver atoms in the aggregated NPs are some of the major factors contributing towards better NP interactions and subsequent cell death. In vivo studies in bacterial cells showed that the NPs exerted a mild perturbation of the membrane potential. However, its most striking effect was on the actin cytoskeleton MreB resulting in morphological changes in the bacterial cell shape from rods to predominantly spheres. Exposure to NPs resulted in the delocalization of MreB patches from the membrane but not the tubulin homologue FtsZ. Concomitant with the redistribution of MreB localization, a dramatic increase of membrane fluid regions was observed. Our studies reveal for the first time that Au-Ag NPs can mediate bacterial killing and disrupt the actin cytoskeletal functions in bacteria.
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Affiliation(s)
- Prajna Jena
- Centre for Research in Nanoscience and Nanotechnology, University of Calcutta, JD-2, sector -3, Salt Lake City, Kolkata, India.
| | - Maireyee Bhattacharya
- Chemical Sciences Division, Saha Institute of Nuclear Physics, HBNI, 1/AF, Bidhannagar, Kolkata-700064, India.
| | - Gourab Bhattacharjee
- Surface Physics and Materials Science Division, Saha Institute of Nuclear Physics, HBNI, 1/AF, Bidhannagar, Kolkata-700064, India
| | - Biswarup Satpati
- Surface Physics and Materials Science Division, Saha Institute of Nuclear Physics, HBNI, 1/AF, Bidhannagar, Kolkata-700064, India
| | - Prasun Mukherjee
- Centre for Research in Nanoscience and Nanotechnology, University of Calcutta, JD-2, sector -3, Salt Lake City, Kolkata, India.
| | - Dulal Senapati
- Chemical Sciences Division, Saha Institute of Nuclear Physics, HBNI, 1/AF, Bidhannagar, Kolkata-700064, India.
| | - Ramanujam Srinivasan
- School of Biological Sciences, National Institute of Science Education and Research (NISER), HBNI, Bhubaneswar, Odisha 752050, India.
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14
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Smirnov MY, Kalinkin AV, Bukhtiyarov VI. XPS Analysis of the Spacial Distribution of Metals in Au-Ag Bimetallic Particles Considering the Effect of Particle Size Distribution. J STRUCT CHEM+ 2020. [DOI: 10.1134/s0022476620010035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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15
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Smirnov MY, Kalinkin AV, Klembovsky IO, Bukhtiyarov VI. Changes in the Spatial Distribution of Metals Under the Influence of Reaction Medium in the System Formed by a Gold Film Supported on the Surface of a Silver Foil. J STRUCT CHEM+ 2019. [DOI: 10.1134/s0022476619110106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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16
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Zugic B, van Spronsen MA, Heine C, Montemore MM, Li Y, Zakharov DN, Karakalos S, Lechner BA, Crumlin E, Biener MM, Frenkel AI, Biener J, Stach EA, Salmeron MB, Kaxiras E, Madix RJ, Friend CM. Evolution of steady-state material properties during catalysis: Oxidative coupling of methanol over nanoporous Ag0.03Au0.97. J Catal 2019. [DOI: 10.1016/j.jcat.2019.08.041] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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17
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Kim J, Jun M, Choi S, Jo J, Lee K. Reactive nanotemplates for synthesis of highly efficient electrocatalysts: beyond simple morphology transfer. NANOSCALE 2019; 11:20392-20410. [PMID: 31651011 DOI: 10.1039/c9nr05750a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Efficient electrocatalysts for energy conversion in general, and fuel cell operation and water electrolysis in particular, are pivotal for carbon-free hydrogen production. While the requirements of successful electrocatalysts include a high number density of catalytically active sites, high surface-to-volume ratio, inherently high catalytic activity, and robustness of the catalyst surface structure under harsh operating conditions, it is extremely difficult to synthesize nanocatalysts that could possess all these structural characteristics. Nanotemplate-mediated synthesis, namely, the coating or filling of a template with a desired material phase followed by the removal of the template, has captured the interest of researchers because of the ease of creating hollow-structured nanocatalysts with a high surface to volume ratio. Recent studies, however, have revealed that nanotemplates could be more than just passive supports because they greatly affect catalytic performance by creating an unusual synergy between the substrate and catalyst and by providing dopants to the actual catalyst phase owing to their reactive nature. In this review, we discuss the most notable recent advances in the nanotemplate-based synthesis of electrocatalysts as well as the unusual effects of nanotemplates on the performance of nanocatalysts. We also provide an outlook for this fledgling field so that future research efforts could be focused on the development of practically useful electrocatalysts that could shape the future of energy technologies.
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Affiliation(s)
- Jun Kim
- Department of Chemistry and Research Institute for Natural Sciences, Korea University, Seoul 02841, Republic of Korea.
| | - Minki Jun
- Department of Chemistry and Research Institute for Natural Sciences, Korea University, Seoul 02841, Republic of Korea.
| | - Songa Choi
- Department of Chemistry and Research Institute for Natural Sciences, Korea University, Seoul 02841, Republic of Korea.
| | - Jinhyoung Jo
- Department of Chemistry and Research Institute for Natural Sciences, Korea University, Seoul 02841, Republic of Korea.
| | - Kwangyeol Lee
- Department of Chemistry and Research Institute for Natural Sciences, Korea University, Seoul 02841, Republic of Korea.
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18
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Liu J, Ni Z, Nandi P, Mirsaidov U, Huang Z. Chirality Transfer in Galvanic Replacement Reactions. NANO LETTERS 2019; 19:7427-7433. [PMID: 31536361 DOI: 10.1021/acs.nanolett.9b03117] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Demand for the transfer of chirality from a pre-engineered nanoparticle to any other metal is of fundamental importance for developing a wide range of chirality-related applications. Herein, we show that binary alloy chiral nanoparticles (CNPs) with an engineerable composition can be formed from metallic CNPs with intrinsic structural chirality serving as sacrificial templates (STs), via a galvanic replacement reaction (GRR). This GRR-mediated chirality transfer is a general phenomenon and results in the formation of Cu-Ag CNPs with solid morphology and mesoporous CNPs made of Ag-Au, Ag-Pt, and Ag-Pd. Our study imposes a new component, i.e., structural chirality, on the GRR. The insights from our study improve our fundamental understanding of the GRR principle and devise a versatile method to generate mesoporous alloy CNPs for developing prominent chirality-related applications in asymmetric catalysis, enantiodifferentiation, enantioseparation, biodetection, and bioimaging.
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Affiliation(s)
- Junjun Liu
- Department of Physics , Hong Kong Baptist University (HKBU) , Kowloon Tong, Kowloon , Hong Kong SAR , China
- HKBU Institute of Research and Continuing Education, Industrialization Complex Building , Shenzhen Virtual University Park , No. 2 Yuexing Third Road , Shenzhen , Guangdong 518000 , China
| | - Ziyue Ni
- Department of Physics , Hong Kong Baptist University (HKBU) , Kowloon Tong, Kowloon , Hong Kong SAR , China
| | - Proloy Nandi
- Centre for BioImaging Sciences, Department of Biological Sciences , National University of Singapore , Singapore 117557 , Singapore
| | - Utkur Mirsaidov
- Centre for BioImaging Sciences, Department of Biological Sciences , National University of Singapore , Singapore 117557 , Singapore
- Centre for Advanced 2D Materials and Graphene Research Centre, Department of Physics , National University of Singapore , Singapore 117551 , Singapore
| | - Zhifeng Huang
- Department of Physics , Hong Kong Baptist University (HKBU) , Kowloon Tong, Kowloon , Hong Kong SAR , China
- HKBU Institute of Research and Continuing Education, Industrialization Complex Building , Shenzhen Virtual University Park , No. 2 Yuexing Third Road , Shenzhen , Guangdong 518000 , China
- Institute of Advanced Materials, State Key Laboratory of Environmental and Biological Analysis , Golden Meditech Centre for NeuroRegeneration Sciences, HKBU , Kowloon Tong, Kowloon , Hong Kong SAR , China
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19
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Burnett TL, Withers PJ. Completing the picture through correlative characterization. NATURE MATERIALS 2019; 18:1041-1049. [PMID: 31209389 DOI: 10.1038/s41563-019-0402-8] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Accepted: 05/15/2019] [Indexed: 05/28/2023]
Abstract
Natural and manufactured materials rely on complex hierarchical microstructures to deliver a suite of interesting properties. To predict and tailor their performance requires a joined-up knowledge of their multiphase microstructure, interfaces, chemistry and crystallography from the nanoscale to the macroscale. This Perspective reflects on how recent developments in correlative characterization can bring together multiple image modalities and maps of the local chemistry, structure and functionality to form rich multimodal and multiscale correlated datasets. The automated collection and digitization of multidimensional data is an essential part of the picture for developing multiscale modelling and 'big data'-driven machine learning approaches. These are needed to both improve our understanding of existing materials and exploit high-throughput combinatorial synthesis, processing and testing methods to develop materials with bespoke properties.
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Affiliation(s)
- T L Burnett
- Henry Royce Institute for Advanced Materials, School of Materials, The University of Manchester, Manchester, UK
| | - P J Withers
- Henry Royce Institute for Advanced Materials, School of Materials, The University of Manchester, Manchester, UK.
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20
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Yang H, Liu W, Wang Z, Sun G. The Synthesis of SiO
2
@AuAg@CeO
2
Sandwich Structures with Enhanced Catalytic Performance Towards CO Oxidation. ChemistrySelect 2019. [DOI: 10.1002/slct.201901792] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Hongxiao Yang
- School of Chemistry and Chemical EngineeringUniversity of Jinan
| | - Wei Liu
- School of Water Conservancy and EnvironmentUniversity of Jinan
| | - Zhaohui Wang
- School of Chemistry and Chemical EngineeringUniversity of Jinan
| | - Guoxin Sun
- School of Chemistry and Chemical EngineeringUniversity of Jinan
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21
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Song H, Yang Y, Geng J, Gu Z, Zou J, Yu C. Electron Tomography: A Unique Tool Solving Intricate Hollow Nanostructures. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1801564. [PMID: 30160340 DOI: 10.1002/adma.201801564] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2018] [Revised: 06/05/2018] [Indexed: 06/08/2023]
Abstract
Innovations in nanofabrication have expedited advances in hollow-structured nanomaterials with increasing complexity, which, at the same time, set challenges for the precise determination of their intriguing and complicated 3D configurations. Conventional transmission electron microscopy (TEM) analysis typically yields 2D projections of 3D objects, which in some cases is insufficient to reflect the genuine architectures of these 3D nano-objects, providing misleading information. Advanced analytical approaches such as focused ion beam (FIB) and ultramicrotomy enable the real slicing of nanomaterials, realizing the direct observation of inner structures but with limited spatial discrimination. Electron tomography (ET) is a technique that retrieves spatial information from a series of 2D electron projections at different tilt angles. As a unique and powerful tool kit, this technique has experienced great advances in its application in materials science, resolving the intricate 3D nanostructures. Here, the exceptional capability of the ET technique in the structural, chemical, and quantitative analysis of hollow-structured nanomaterials is discussed in detail. The distinct information derived from ET analysis is highlighted and compared with conventional analysis methods. Along with the advances in microscopy technologies, the state-of-the-art ET technique offers great opportunities and promise in the development of hollow nanomaterials.
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Affiliation(s)
- Hao Song
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD, 4072, Australia
| | - Yannan Yang
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD, 4072, Australia
| | - Jing Geng
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD, 4072, Australia
| | - Zhengying Gu
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD, 4072, Australia
| | - Jin Zou
- Materials Engineering and Centre for Microscopy and Microanalysis, The University of Queensland, Brisbane, QLD, 4072, Australia
| | - Chengzhong Yu
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD, 4072, Australia
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22
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Stucchi M, Jouve A, Villa A, Nagy G, Németh M, Evangelisti C, Zanella R, Prati L. Gold‐Silver Catalysts: Ruling Factors for Establishing Synergism. ChemCatChem 2019. [DOI: 10.1002/cctc.201900591] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Marta Stucchi
- Università degli Studi di MilanoDipartimento di Chimica via C. Golgi 19 20133 Milano Italy
| | - Andrea Jouve
- Università degli Studi di MilanoDipartimento di Chimica via C. Golgi 19 20133 Milano Italy
| | - Alberto Villa
- Università degli Studi di MilanoDipartimento di Chimica via C. Golgi 19 20133 Milano Italy
| | - Gergely Nagy
- Centre for Energy ResearchSurface Chemistry and Catalysis Department PO Box 49 H-1525 Budapest Hungary
| | - Miklòs Németh
- Centre for Energy ResearchSurface Chemistry and Catalysis Department PO Box 49 H-1525 Budapest Hungary
| | - Claudio Evangelisti
- CNR, Istituto di Scienze e Tecnologie Molecolari (ISTM) via G. Fantoli 16/15, 20138 Milano Italy
| | - Rodolfo Zanella
- Instituto de Ciencias Aplicadas y TecnologíaUniversidad Nacional Autónoma de México Circuito Exterior S/N, C. U. 04510 Mexico City Mexico
| | - Laura Prati
- Università degli Studi di MilanoDipartimento di Chimica via C. Golgi 19 20133 Milano Italy
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23
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Huber R, Haberfehlner G, Holler M, Kothleitner G, Bredies K. Total generalized variation regularization for multi-modal electron tomography. NANOSCALE 2019; 11:5617-5632. [PMID: 30864603 DOI: 10.1039/c8nr09058k] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
In multi-modal electron tomography, tilt series of several signals such as X-ray spectra, electron energy-loss spectra, annular dark-field, or bright-field data are acquired at the same time in a transmission electron microscope and subsequently reconstructed in three dimensions. However, the acquired data are often incomplete and suffer from noise, and generally each signal is reconstructed independently of all other signals, not taking advantage of correlation between different datasets. This severely limits both the resolution and validity of the reconstructed images. In this paper, we show how image quality in multi-modal electron tomography can be greatly improved by employing variational modeling and multi-channel regularization techniques. To achieve this aim, we employ a coupled Total Generalized Variation (TGV) regularization that exploits correlation between different channels. In contrast to other regularization methods, coupled TGV regularization allows to reconstruct both hard transitions and gradual changes inside each sample, and links different channels at the level of first and higher order derivatives. This favors similar interface positions for all reconstructions, thereby improving the image quality for all data, in particular, for 3D elemental maps. We demonstrate the joint multi-channel TGV reconstruction on tomographic energy-dispersive X-ray spectroscopy (EDXS) and high-angle annular dark field (HAADF) data, but the reconstruction method is generally applicable to all types of signals used in electron tomography, as well as all other types of projection-based tomographies.
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Affiliation(s)
- Richard Huber
- Institute for Mathematics and Scientific Computing, University of Graz, Heinrichstraße 36, A-8010 Graz, Austria.
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24
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Wang YC, Slater TJA, Leteba GM, Roseman AM, Race CP, Young NP, Kirkland AI, Lang CI, Haigh SJ. Imaging Three-Dimensional Elemental Inhomogeneity in Pt-Ni Nanoparticles Using Spectroscopic Single Particle Reconstruction. NANO LETTERS 2019; 19:732-738. [PMID: 30681878 PMCID: PMC6378652 DOI: 10.1021/acs.nanolett.8b03768] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
The properties of nanoparticles are known to critically depend on their local chemistry but characterizing three-dimensional (3D) elemental segregation at the nanometer scale is highly challenging. Scanning transmission electron microscope (STEM) tomographic imaging is one of the few techniques able to measure local chemistry for inorganic nanoparticles but conventional methodologies often fail due to the high electron dose imparted. Here, we demonstrate realization of a new spectroscopic single particle reconstruction approach built on a method developed by structural biologists. We apply this technique to the imaging of PtNi nanocatalysts and find new evidence of a complex inhomogeneous alloying with a Pt-rich core, a Ni-rich hollow octahedral intermediate shell and a Pt-rich rhombic dodecahedral skeleton framework with less Pt at ⟨100⟩ vertices. The ability to gain evidence of local surface enrichment that varies with the crystallographic orientation of facets and vertices is expected to provide significant insight toward the development of nanoparticles for sensing, medical imaging, and catalysis.
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Affiliation(s)
- Yi-Chi Wang
- School
of Materials, University of Manchester, Oxford Road, Manchester M13 9PL, United
Kingdom
| | - Thomas J. A. Slater
- School
of Materials, University of Manchester, Oxford Road, Manchester M13 9PL, United
Kingdom
- Electron
Physical Sciences Imaging Centre, Diamond Light Source Ltd., Oxfordshire OX11 0DE, United Kingdom
- E-mail:
| | - Gerard M. Leteba
- Catalysis
Institute, Department of Chemical Engineering, University of Cape Town, Rondebosch 7701, South Africa
| | - Alan M. Roseman
- Division
of Molecular and Cellular Function, School of Biological Sciences,
Faculty of Biology, Medicine and Health, Manchester Academic Health
Science Centre, University of Manchester, Manchester M13 9PL, United Kingdom
| | - Christopher P. Race
- School
of Materials, University of Manchester, Oxford Road, Manchester M13 9PL, United
Kingdom
| | - Neil P. Young
- Department
of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, United
Kingdom
| | - Angus I. Kirkland
- Electron
Physical Sciences Imaging Centre, Diamond Light Source Ltd., Oxfordshire OX11 0DE, United Kingdom
- Department
of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, United
Kingdom
| | - Candace I. Lang
- School of
Engineering, Macquarie University, Macquarie Park, NSW 2109 Australia
| | - Sarah J. Haigh
- School
of Materials, University of Manchester, Oxford Road, Manchester M13 9PL, United
Kingdom
- E-mail:
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25
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Liu J, Wu Z, He Q, Tian Q, Wu W, Xiao X, Jiang C. Catalytic Application and Mechanism Studies of Argentic Chloride Coupled Ag/Au Hollow Heterostructures: Considering the Interface Between Ag/Au Bimetals. NANOSCALE RESEARCH LETTERS 2019; 14:35. [PMID: 30684022 PMCID: PMC6349269 DOI: 10.1186/s11671-019-2862-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2018] [Accepted: 01/10/2019] [Indexed: 05/27/2023]
Abstract
For an economical use of solar energy, photocatalysts that are sufficiently efficient, stable, and capable of harvesting light are required. Composite heterostructures composed of noble metals and semiconductors exhibited the excellent in catalytic application. Here, 1D Ag/Au/AgCl hollow heterostructures are synthesized by galvanic replacement reaction (GRR) from Ag nanowires (NWs). The catalytic properties of these as-obtained Ag/Au/AgCl hollow heterostructures with different ratios are investigated by reducing 4-nitrophenol (Nip) into 4-aminophenol (Amp) in the presence of NaBH4, and the influence of AgCl semiconductor to the catalytic performances of Ag/Au bimetals is also investigated. These hollow heterostructures show the higher catalytic properties than pure Ag NWs, and the AgCl not only act as supporting materials, but the excess AgCl is also the obstacle for contact of Ag/Au bimetals with reactive species. Moreover, the photocatalytic performances of these hollow heterostructures are carried out by degradation of acid orange 7 (AO7) under UV and visible light. These Ag/Au/AgCl hollow heterostructures present the higher photocatalytic activities than pure Ag NWs and commercial TiO2 (P25), and the Ag/Au bimetals enhance the photocatalytic activity of AgCl semiconductor via the localized surface plasmon resonance (LSPR) and plasmon resonance energy transfer (PRET) mechanisms. The as-synthesized 1D Ag/Au/AgCl hollow heterostructures with multifunction could apply in practical environmental remedy by catalytic manners.
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Affiliation(s)
- Jun Liu
- Hunan Key Laboratory of Biomedical Nanomaterials and Devices, Hunan University of Technology, Zhuzhou, 412007 People’s Republic of China
- Laboratory of Printable Functional Nanomaterials and Printed Electronics, School of Printing and Packaging, Wuhan University, Wuhan, 430072 People’s Republic of China
- Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan, 430072 People’s Republic of China
| | - Zhaohui Wu
- Hunan Key Laboratory of Applied Environmental Photocatalysis, Changsha University, Changsha, 410022 People’s Republic of China
- Laboratory of Printable Functional Nanomaterials and Printed Electronics, School of Printing and Packaging, Wuhan University, Wuhan, 430072 People’s Republic of China
| | - Quanguo He
- Hunan Key Laboratory of Biomedical Nanomaterials and Devices, Hunan University of Technology, Zhuzhou, 412007 People’s Republic of China
| | - Qingyong Tian
- Laboratory of Printable Functional Nanomaterials and Printed Electronics, School of Printing and Packaging, Wuhan University, Wuhan, 430072 People’s Republic of China
- Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan, 430072 People’s Republic of China
| | - Wei Wu
- Laboratory of Printable Functional Nanomaterials and Printed Electronics, School of Printing and Packaging, Wuhan University, Wuhan, 430072 People’s Republic of China
| | - Xiangheng Xiao
- Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan, 430072 People’s Republic of China
| | - Changzhong Jiang
- Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan, 430072 People’s Republic of China
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26
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R. Daniel J, McCarthy LA, Ringe E, Boudreau D. Enhanced control of plasmonic properties of silver–gold hollow nanoparticles via a reduction-assisted galvanic replacement approach. RSC Adv 2019; 9:389-396. [PMID: 35521593 PMCID: PMC9059334 DOI: 10.1039/c8ra09364d] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Accepted: 12/18/2018] [Indexed: 12/29/2022] Open
Abstract
Hollow noble metal nanoparticles are of growing interest due to their localized surface plasmon resonance (LSPR) tunability. A popular synthetic approach is galvanic replacement which can be coupled with a co-reducer. Here, we describe the control over morphology, and therefore over plasmonic properties including energy, bandwidth, extinction and scattering intensity, offered by co-reduction galvanic replacement. This study indicates that whereas the variation of atomic stoichiometry using the co-reduction method described in this work offers a rather modest tuning range of LSPR energy when compared to traditional galvanic replacement, it nevertheless has a profound effect on shell thickness, which imparts a degree of control over scattering intensity and sensitivity to changes in the dielectric constant of the surrounding environment. Therefore, in this context particle size and gold content become two design parameters that can be used to independently tune LSPR energy and intensity. A co-reduction assisted method for the synthesis of Ag–Au hollow nanoparticles with enhanced control over plasmon wavelength and scattering intensity.![]()
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Affiliation(s)
- Josée R. Daniel
- Département de Chimie et Centre D'optique, Photonique et Laser (COPL)
- Université Laval
- Canada
| | | | - Emilie Ringe
- Department of Chemistry
- Rice University
- Houston
- USA
- Department of Materials Science and Metallurgy
| | - Denis Boudreau
- Département de Chimie et Centre D'optique, Photonique et Laser (COPL)
- Université Laval
- Canada
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27
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da Silva AG, Rodrigues TS, Candido EG, de Freitas IC, da Silva AH, Fajardo HV, Balzer R, Gomes JF, Assaf JM, de Oliveira DC, Oger N, Paul S, Wojcieszak R, Camargo PH. Combining active phase and support optimization in MnO2-Au nanoflowers: Enabling high activities towards green oxidations. J Colloid Interface Sci 2018; 530:282-291. [DOI: 10.1016/j.jcis.2018.06.089] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Revised: 06/26/2018] [Accepted: 06/27/2018] [Indexed: 02/01/2023]
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28
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Gilis N, Jacobs L, Barroo C, Visart de Bocarmé T. Surface Segregation in Au–Ag Alloys Investigated by Atom Probe Tomography. Top Catal 2018. [DOI: 10.1007/s11244-018-1040-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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29
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Feng X, Yang J, Duan X, Cao Y, Chen B, Chen W, Lin D, Qian G, Chen D, Yang C, Zhou X. Enhanced Catalytic Performance for Propene Epoxidation with H2 and O2 over Bimetallic Au–Ag/Uncalcined Titanium Silicate-1 Catalysts. ACS Catal 2018. [DOI: 10.1021/acscatal.8b01324] [Citation(s) in RCA: 71] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xiang Feng
- State Key Laboratory of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, China
| | - Jia Yang
- State Key Laboratory of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Xuezhi Duan
- State Key Laboratory of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Yueqiang Cao
- State Key Laboratory of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Bingxu Chen
- State Key Laboratory of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Wenyao Chen
- State Key Laboratory of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Dong Lin
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, China
| | - Gang Qian
- State Key Laboratory of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - De Chen
- Department of Chemical Engineering, Norwegian University of Science and Technology, Trondheim 7491, Norway
| | - Chaohe Yang
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, China
| | - Xinggui Zhou
- State Key Laboratory of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
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30
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Gao BB, Zhang M, Chen XR, Zhu DL, Yu H, Zhang WH, Lang JP. Preparation of carbon-based AuAg alloy nanoparticles by using the heterometallic [Au 4Ag 4] cluster for efficient oxidative coupling of anilines. Dalton Trans 2018; 47:5780-5788. [PMID: 29644361 DOI: 10.1039/c8dt00695d] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We herein report the preparation of unique heteroatom-doped and carbon-based AuAg alloy nanoparticles (NPs) via the pyrolysis of a structurally defined octanuclear heterometallic Au(i)-Ag(i) cluster [Au4Ag4(Dppy)4(Tab)4(MeCN)4](PF6)8 (2, Dppy = diphenylphosphine-2-pyridine and Tab = 4-(trimethylammonio)benzenethiolate). This cluster-precursor approach exerts a fine control over the spatial arrangement, size and uniformity of the AuAg alloy NPs as well as the doped heteroatoms (P, N, F and S). The optimized material prepared at 450 °C efficiently catalyzes the oxidative coupling of anilines to yield azobenzenes under mild conditions.
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Affiliation(s)
- Bin-Bin Gao
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, People's Republic of China.
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31
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MacArthur KE, Heggen M, Dunin-Borkowski RE. Differentiating the structure of PtNi octahedral nanoparticles through combined ADF-EDX simulations. ACTA ACUST UNITED AC 2018; 4:2. [PMID: 29497598 PMCID: PMC5820384 DOI: 10.1186/s40679-018-0053-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Accepted: 02/10/2018] [Indexed: 11/18/2022]
Abstract
Advances in catalysis rely on the synthesis and characterisation of nanoparticles that have tailored structures and compositions. Although energy-dispersive X-ray (EDX) spectroscopy can be used to study local variations in the compositions of individual supported nanoparticles on the atomic-scale in the scanning transmission electron microscope, electron beam induced damage and contamination can preclude the use of long exposure times and tomographic approaches. Here, we perform simulations of EDX maps of seven different octahedral PtNi nanoparticles for a selection of crystallographic orientations and tilts, to evaluate which of them can be distinguished from elemental mapping performed in only one orientation.
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Affiliation(s)
- Katherine E MacArthur
- Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons and Peter Grünberg Institute, Forschungszentrum Jülich, 52425 Jülich, Germany
| | - Marc Heggen
- Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons and Peter Grünberg Institute, Forschungszentrum Jülich, 52425 Jülich, Germany
| | - Rafal E Dunin-Borkowski
- Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons and Peter Grünberg Institute, Forschungszentrum Jülich, 52425 Jülich, Germany
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32
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A novel peptide/Fe3O4@SiO2-Au nanocomposite-based fluorescence biosensor for the highly selective and sensitive detection of prostate-specific antigen. Talanta 2018; 179:531-537. [DOI: 10.1016/j.talanta.2017.11.033] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2017] [Revised: 10/27/2017] [Accepted: 11/17/2017] [Indexed: 12/19/2022]
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33
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Bao X, Qin Z, Zhou T, Deng J. In-situ generation of gold nanoparticles on MnO 2 nanosheets for the enhanced oxidative degradation of basic dye (Methylene Blue). J Environ Sci (China) 2018; 65:236-245. [PMID: 29548394 DOI: 10.1016/j.jes.2017.03.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2016] [Accepted: 03/03/2017] [Indexed: 06/08/2023]
Abstract
In this work, the gold nanoparticles (Au-NPs) were in-situ generated on the surface of MnO2 nanosheets to form MnO2/Au-NPs nanocomposite in a simple and cost-effective way. Multiple experiments were carried out to optimize the oxidation of basic dye (Methylene Blue (MB)), including the molar ratio of MnO2 to chloroauric acid (HAuCl4), the pH of the solution and the effect of initial material. Under the optimal condition, the highest degradation efficiency for MB achieved to 98.9% within 60 min, which was obviously better than commercial MnO2 powders (4.3%) and MnO2 nanosheets (74.2%). The enhanced oxidative degradation might attribute to the in-situ generation of ultra-small and highly-dispersed Au-NPs which enlarged the synergistic effect and/or interfacial effect between MnO2 nanosheets and Au-NPs and facilitated the uptake of electrons by MnO2 from MB during the oxidation, thus validating the application of MnO2/Au-NPs nanocomposite for direct removal of organic dyes from wastewater in a simple and convenient fashion.
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Affiliation(s)
- Xueqin Bao
- School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, China
| | - Zhen Qin
- School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, China
| | - Tianshu Zhou
- School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, China
| | - Jingjing Deng
- School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, China.
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34
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Ferbonink GF, Rodrigues TS, dos Santos DP, Camargo PHC, Albuquerque RQ, Nome RA. Correlating structural dynamics and catalytic activity of AgAu nanoparticles with ultrafast spectroscopy and all-atom molecular dynamics simulations. Faraday Discuss 2018; 208:269-286. [DOI: 10.1039/c7fd00220c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Electron–phonon coupling times, equilibrium structures and surface segregation as a function of hollow core–shell AgAu nanoparticle composition.
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Affiliation(s)
- G. F. Ferbonink
- Instituto de Química
- Universidade Estadual de Campinas (UNICAMP)
- Campinas
- Brazil
| | - T. S. Rodrigues
- Departamento de Química Fundamental
- Instituto de Química
- Universidade de Sao Paulo
- 05508-000 São Paulo
- Brazil
| | - D. P. dos Santos
- Instituto de Química
- Universidade Estadual de Campinas (UNICAMP)
- Campinas
- Brazil
| | - P. H. C. Camargo
- Departamento de Química Fundamental
- Instituto de Química
- Universidade de Sao Paulo
- 05508-000 São Paulo
- Brazil
| | - R. Q. Albuquerque
- School of Pharmacy and Biomolecular Sciences
- Liverpool John Moores University
- Liverpool
- UK
| | - R. A. Nome
- Instituto de Química
- Universidade Estadual de Campinas (UNICAMP)
- Campinas
- Brazil
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35
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MacArthur KE, Brown HG, Findlay SD, Allen LJ. Probing the effect of electron channelling on atomic resolution energy dispersive X-ray quantification. Ultramicroscopy 2017; 182:264-275. [DOI: 10.1016/j.ultramic.2017.07.020] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Revised: 07/28/2017] [Accepted: 07/30/2017] [Indexed: 11/29/2022]
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36
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Wang YC, Slater TJA, Rodrigues TS, Camargo PHC, Haigh SJ. Automated quantification of morphology and chemistry from STEM data of individual nanoparticles. ACTA ACUST UNITED AC 2017. [DOI: 10.1088/1742-6596/902/1/012018] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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37
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Holade Y, Servat K, Tingry S, Napporn TW, Remita H, Cornu D, Kokoh KB. Advances in Electrocatalysis for Energy Conversion and Synthesis of Organic Molecules. Chemphyschem 2017; 18:2573-2605. [DOI: 10.1002/cphc.201700447] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2017] [Revised: 06/30/2017] [Indexed: 12/18/2022]
Affiliation(s)
- Yaovi Holade
- Institut Européen des Membranes, IEM UMR 5635, CNRS-UM-ENSCM Place Eugène Bataillon 34095 Montpellier Cedex 5 France
| | - Karine Servat
- Université de Poitiers, IC2MP UMR 7285 CNRS 4, rue Michel Brunet B-27, TSA 51106 86073 Poitiers Cedex 09 France
| | - Sophie Tingry
- Institut Européen des Membranes, IEM UMR 5635, CNRS-UM-ENSCM Place Eugène Bataillon 34095 Montpellier Cedex 5 France
| | - Teko W. Napporn
- Université de Poitiers, IC2MP UMR 7285 CNRS 4, rue Michel Brunet B-27, TSA 51106 86073 Poitiers Cedex 09 France
| | - Hynd Remita
- Université Paris-Sud, Université Paris SaclayLaboratoire de Chimie Physique, UMR 8000-CNRS, Bât. 349 91405 Orsay France
- CNRSLaboratoire de Chimie Physique, UMR 8000 91405 Orsay France
| | - David Cornu
- Institut Européen des Membranes, IEM UMR 5635, CNRS-UM-ENSCM Place Eugène Bataillon 34095 Montpellier Cedex 5 France
| | - K. Boniface Kokoh
- Université de Poitiers, IC2MP UMR 7285 CNRS 4, rue Michel Brunet B-27, TSA 51106 86073 Poitiers Cedex 09 France
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38
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Collins SM, Midgley PA. Progress and opportunities in EELS and EDS tomography. Ultramicroscopy 2017; 180:133-141. [DOI: 10.1016/j.ultramic.2017.01.003] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2016] [Revised: 12/08/2016] [Accepted: 01/10/2017] [Indexed: 10/20/2022]
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39
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Prestat E, Kulzick MA, Dietrich PJ, Smith MM, Tien ME, Burke MG, Haigh SJ, Zaluzec NJ. In Situ Industrial Bimetallic Catalyst Characterization using Scanning Transmission Electron Microscopy and X-ray Absorption Spectroscopy at One Atmosphere and Elevated Temperature. Chemphyschem 2017; 18:2151-2156. [PMID: 28605152 PMCID: PMC5577507 DOI: 10.1002/cphc.201700425] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2017] [Indexed: 11/20/2022]
Abstract
We have developed a new experimental platform for in situ scanning transmission electron microscope (STEM) energy dispersive X‐ray spectroscopy (EDS) which allows real time, nanoscale, elemental and structural changes to be studied at elevated temperature (up to 1000 °C) and pressure (up to 1 atm). Here we demonstrate the first application of this approach to understand complex structural changes occurring during reduction of a bimetallic catalyst, PdCu supported on TiO2, synthesized by wet impregnation. We reveal a heterogeneous evolution of nanoparticle size, distribution, and composition with large differences in reduction behavior for the two metals. We show that the data obtained is complementary to in situ STEM electron energy loss spectroscopy (EELS) and when combined with in situ X‐ray absorption spectroscopy (XAS) allows correlation of bulk chemical state with nanoscale changes in elemental distribution during reduction, facilitating new understanding of the catalytic behavior for this important class of materials.
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Affiliation(s)
- Eric Prestat
- School of MaterialsUniversity of ManchesterManchesterM13 9PLUnited Kingdom
| | | | | | - Mr. Matthew Smith
- School of MaterialsUniversity of ManchesterManchesterM13 9PLUnited Kingdom
| | - Mr. Eu‐Pin Tien
- School of MaterialsUniversity of ManchesterManchesterM13 9PLUnited Kingdom
| | - M. Grace Burke
- School of MaterialsUniversity of ManchesterManchesterM13 9PLUnited Kingdom
| | - Sarah J. Haigh
- School of MaterialsUniversity of ManchesterManchesterM13 9PLUnited Kingdom
| | - Nestor J. Zaluzec
- School of MaterialsUniversity of ManchesterManchesterM13 9PLUnited Kingdom
- Argonne National LaboratoryPhoton Sciences DivisionArgonneIL60439USA
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40
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Multiscale correlative tomography: an investigation of creep cavitation in 316 stainless steel. Sci Rep 2017; 7:7332. [PMID: 28779097 PMCID: PMC5544716 DOI: 10.1038/s41598-017-06976-5] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2017] [Accepted: 06/21/2017] [Indexed: 11/08/2022] Open
Abstract
Creep cavitation in an ex-service nuclear steam header Type 316 stainless steel sample is investigated through a multiscale tomography workflow spanning eight orders of magnitude, combining X-ray computed tomography (CT), plasma focused ion beam (FIB) scanning electron microscope (SEM) imaging and scanning transmission electron microscope (STEM) tomography. Guided by microscale X-ray CT, nanoscale X-ray CT is used to investigate the size and morphology of cavities at a triple point of grain boundaries. In order to understand the factors affecting the extent of cavitation, the orientation and crystallographic misorientation of each boundary is characterised using electron backscatter diffraction (EBSD). Additionally, in order to better understand boundary phase growth, the chemistry of a single boundary and its associated secondary phase precipitates is probed through STEM energy dispersive X-ray (EDX) tomography. The difference in cavitation of the three grain boundaries investigated suggests that the orientation of grain boundaries with respect to the direction of principal stress is important in the promotion of cavity formation.
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41
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Montemore MM, Montessori A, Succi S, Barroo C, Falcucci G, Bell DC, Kaxiras E. Effect of nanoscale flows on the surface structure of nanoporous catalysts. J Chem Phys 2017; 146:214703. [PMID: 28576088 PMCID: PMC5648575 DOI: 10.1063/1.4984614] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2017] [Accepted: 05/17/2017] [Indexed: 11/14/2022] Open
Abstract
The surface structure and composition of a multi-component catalyst are critical factors in determining its catalytic performance. The surface composition can depend on the local pressure of the reacting species, leading to the possibility that the flow through a nanoporous catalyst can affect its structure and reactivity. Here, we explore this possibility for oxidation reactions on nanoporous gold, an AgAu bimetallic catalyst. We use microscopy and digital reconstruction to obtain the morphology of a two-dimensional slice of a nanoporous gold sample. Using lattice Boltzmann fluid dynamics simulations along with thermodynamic models based on first-principles total-energy calculations, we show that some sections of this sample have low local O2 partial pressures when exposed to reaction conditions, which leads to a pure Au surface in these regions, instead of the active bimetallic AgAu phase. We also explore the effect of temperature on the surface structure and find that moderate temperatures (≈300-450 K) should result in the highest intrinsic catalytic performance, in apparent agreement with experimental results.
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Affiliation(s)
- Matthew M Montemore
- Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, Massachusetts 02138, USA
| | - Andrea Montessori
- Department of Engineering, University of Rome "Roma Tre," Via della Vasca Navale 79, 00143 Rome, Italy
| | - Sauro Succi
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, 29 Oxford Street, Cambridge, Massachusetts 02138, USA
| | - Cédric Barroo
- Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, Massachusetts 02138, USA
| | - Giacomo Falcucci
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, 29 Oxford Street, Cambridge, Massachusetts 02138, USA
| | - David C Bell
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, 29 Oxford Street, Cambridge, Massachusetts 02138, USA
| | - Efthimios Kaxiras
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, 29 Oxford Street, Cambridge, Massachusetts 02138, USA
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42
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Gao F, Sun M, Ma W, Wu X, Liu L, Kuang H, Xu C. A Singlet Oxygen Generating Agent by Chirality-dependent Plasmonic Shell-Satellite Nanoassembly. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2017; 29:1606864. [PMID: 28230915 DOI: 10.1002/adma.201606864] [Citation(s) in RCA: 72] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2016] [Indexed: 06/06/2023]
Abstract
Photodynamic therapy (PDT) agent, which generates singlet oxygen (1 O2 ) under light, has attracted significant attention for its broad biological and medical applications. Here, DNA-driven shell-satellite (SS) gold assemblies as chiral photosensitizers are first fabricated. The chiral plasmonic nanostructure, coupling with cysteine enantiomers on its surface, exhibits intense chiroplasmonic activities (-40.2 ± 2.6 mdeg) in the visible region. These chiral SS nanoassemblies have high reactive oxygen species generating efficiency under circular polarized light illumination, resulting in a 1 O2 quantum yield of 1.09. Meanwhile, it is found that SS could be utilized as PDT agent with remarkable efficiency under right circular polarized light irradiation in vitro and in vivo, allowing X-ray computed tomography (CT) and photoacoustics (PA) imaging for tumors simultaneously. The achievements reveal that the enantiomer-dependent and structure-induced nanoassemblies play an important role in PDT effects. The present researches open up a new avenue for cancer diagnose and therapy using chiral nanostructures as multifunctional platform.
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Affiliation(s)
- Fengli Gao
- State Key Lab of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, 214122, P. R. China
- International Joint Research Laboratory for Biointerface and Biodetection, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, 214122, P. R. China
| | - Maozhong Sun
- State Key Lab of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, 214122, P. R. China
- International Joint Research Laboratory for Biointerface and Biodetection, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, 214122, P. R. China
| | - Wei Ma
- State Key Lab of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, 214122, P. R. China
- International Joint Research Laboratory for Biointerface and Biodetection, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, 214122, P. R. China
| | - Xiaoling Wu
- State Key Lab of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, 214122, P. R. China
- International Joint Research Laboratory for Biointerface and Biodetection, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, 214122, P. R. China
| | - Liqiang Liu
- State Key Lab of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, 214122, P. R. China
- International Joint Research Laboratory for Biointerface and Biodetection, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, 214122, P. R. China
| | - Hua Kuang
- State Key Lab of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, 214122, P. R. China
- International Joint Research Laboratory for Biointerface and Biodetection, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, 214122, P. R. China
| | - Chuanlai Xu
- State Key Lab of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, 214122, P. R. China
- International Joint Research Laboratory for Biointerface and Biodetection, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, 214122, P. R. China
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43
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Costa JCS, Gonçalves RV, Teixeira-Neto É, Rossi LM. Temperature-Driven Restructuring of Silver on AuAg Porous Nanotubes: Impact on CO Oxidation. ChemistrySelect 2017. [DOI: 10.1002/slct.201601512] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Jean C. S. Costa
- Departamento de Química Fundamental; Instituto de Química Universidade de São Paulo; Av. Prof. Lineu Prestes 748 São Paulo 05508-000 - SP Brazil
| | - Renato V. Gonçalves
- Instituto de Física de São Carlos; Universidade de São Paulo, CP 369; São Carlos 13560-970, SP Brazil
| | - Érico Teixeira-Neto
- Electron Microscopy Laboratory; LNNano - CNPEM; P.O. box 6192 13083-970 Campinas, SP Brazil
| | - Liane M. Rossi
- Departamento de Química Fundamental; Instituto de Química Universidade de São Paulo; Av. Prof. Lineu Prestes 748 São Paulo 05508-000 - SP Brazil
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44
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da Silva AGM, Rodrigues TS, Haigh SJ, Camargo PHC. Galvanic replacement reaction: recent developments for engineering metal nanostructures towards catalytic applications. Chem Commun (Camb) 2017; 53:7135-7148. [DOI: 10.1039/c7cc02352a] [Citation(s) in RCA: 163] [Impact Index Per Article: 23.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Recent developments to achieve further physicochemical control in metallic nanomaterials by galvanic replacement are discussed towards applications in catalysis.
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Affiliation(s)
- Anderson G. M. da Silva
- Departamento de Química Fundamental
- Instituto de Química
- Universidade de São Paulo
- São Paulo
- Brazil
| | - Thenner S. Rodrigues
- Departamento de Química Fundamental
- Instituto de Química
- Universidade de São Paulo
- São Paulo
- Brazil
| | - Sarah J. Haigh
- School of Materials
- The University of Manchester
- Manchester M13 9PL
- UK
| | - Pedro H. C. Camargo
- Departamento de Química Fundamental
- Instituto de Química
- Universidade de São Paulo
- São Paulo
- Brazil
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45
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Wang J, Xu H, Li S, Yan B, Shi Y, Wang C, Du Y. Plasmonic and photo-electrochemical enhancements of the AuAg@Au/RGO–C3N4 nanocomposite for the detection of DA. Analyst 2017; 142:4852-4861. [DOI: 10.1039/c7an01561e] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Plasmonic photocatalyst has attracted significant attention due to its valuable theoretical study and promising practical applications in solar cells, functional composites, and sensors.
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Affiliation(s)
- Jin Wang
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
- PR China
| | - Hui Xu
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
- PR China
| | - Shumin Li
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
- PR China
| | - Bo Yan
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
- PR China
| | - Yuting Shi
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
- PR China
| | - Caiqin Wang
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
- PR China
| | - Yukou Du
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
- PR China
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46
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Rodrigues TS, da Silva AGM, Gonçalves MC, Fajardo HV, Balzer R, Probst LFD, da Silva AHM, Assaf JM, Camargo PHC. Catalytic Properties of AgPt Nanoshells as a Function of Size: Larger Outer Diameters Lead to Improved Performances. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:9371-9379. [PMID: 27556904 DOI: 10.1021/acs.langmuir.6b01783] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We report herein a systematic investigation on the effect of the size of silver (Ag) nanoparticles employed as starting materials over the morphological features and catalytic performances of AgPt nanoshells produced by a combination of galvanic replacement between Ag and PtCl6(2-) and PtCl6(2-) reduction by hydroquinone. More specifically, we focused on Ag nanoparticles of four different sizes as starting materials, and found that the outer diameter, shell thickness, and the number of Pt surface atoms of the produced nanoshells increased with the size of the starting Ag nanoparticles. The produced AgPt nanoshells were supported into SiO2, and the catalytic performances of the AgPt/SiO2 nanocatalysts toward the gas-phase oxidation of benzene, toluene, and o-xylene (BTX oxidation) followed the order: AgPt 163 nm/SiO2 > AgPt 133 nm/SiO2 > AgPt 105 nm/SiO2 > AgPt 95 nm/SiO2. Interestingly, bigger AgPt nanoshell sizes lead to better catalytic performances in contrast to the intuitive prediction that particles having larger outer diameters tend to present poorer catalytic activities due to their lower surface to volume ratios as compared to smaller particles. This is in agreement with the H2 chemisorption results, and can be assigned to the increase in the Pt surface area with size due to the presence of smaller NPs islands at the surface of the nanoshells having larger outer diameters. This result indicates that, in addition to the overall diameters, the optimization of the surface morphology may play an important role over the optimization of catalytic activities in metal-based nanocatalysts, which can be even more pronounced that the size effect. Our data demonstrate that the control over surface morphology play a very important role relative to the effect of size to the optimization of catalytic performances in catalysts based on noble-metal nanostructures.
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Affiliation(s)
- Thenner S Rodrigues
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo , Av. Prof. Lineu Prestes, 748, 05508-000 São Paulo, SP, Brazil
| | - Anderson G M da Silva
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo , Av. Prof. Lineu Prestes, 748, 05508-000 São Paulo, SP, Brazil
| | - Mariana C Gonçalves
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo , Av. Prof. Lineu Prestes, 748, 05508-000 São Paulo, SP, Brazil
| | - Humberto V Fajardo
- Departamento de Química, Universidade Federal de Ouro Preto , 35400-000 Ouro Preto, MG, Brasil
| | - Rosana Balzer
- Departamento de Química, Universidade Federal de Santa Catarina , 88040-900 Florianópolis, SC, Brasil
| | - Luiz F D Probst
- Departamento de Química, Universidade Federal de Santa Catarina , 88040-900 Florianópolis, SC, Brasil
| | - Alisson H M da Silva
- Departamento de Engenharia Química, Universidade Federal de São Carlos , 13565-905 São Carlos, SP, Brasil
| | - Jose M Assaf
- Departamento de Engenharia Química, Universidade Federal de São Carlos , 13565-905 São Carlos, SP, Brasil
| | - Pedro H C Camargo
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo , Av. Prof. Lineu Prestes, 748, 05508-000 São Paulo, SP, Brazil
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47
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Polavarapu L, Zanaga D, Altantzis T, Rodal-Cedeira S, Pastoriza-Santos I, Pérez-Juste J, Bals S, Liz-Marzán LM. Galvanic Replacement Coupled to Seeded Growth as a Route for Shape-Controlled Synthesis of Plasmonic Nanorattles. J Am Chem Soc 2016; 138:11453-6. [PMID: 27556588 DOI: 10.1021/jacs.6b06706] [Citation(s) in RCA: 76] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Shape-controlled synthesis of metal nanoparticles (NPs) requires mechanistic understanding toward the development of modern nanoscience and nanotechnology. We demonstrate here an unconventional shape transformation of Au@Ag core-shell NPs (nanorods and nanocubes) into octahedral nanorattles via room-temperature galvanic replacement coupled with seeded growth. The corresponding morphological and chemical transformations were investigated in three dimensions, using state-of-the-art X-ray energy-dispersive spectroscopy (XEDS) tomography. The addition of a reducing agent (ascorbic acid) plays a key role in this unconventional mechanistic path, in which galvanic replacement is found to dominate initially when the shell is made of Ag, while seeded growth suppresses transmetalation when a composition of Au:Ag (∼60:40) is reached in the shell, as revealed by quantitative XEDS tomography. This work not only opens new avenues toward the shape control of hollow NPs beyond the morphology of sacrificial templates, but also expands our understanding of chemical transformations in nanoscale galvanic replacement reactions. The XEDS electron tomography study presented here can be generally applied to investigate a wide range of nanoscale morphological and chemical transformations.
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Affiliation(s)
- Lakshminarayana Polavarapu
- Bionanoplasmonics Laboratory, CIC biomaGUNE , Paseo de Miramón 182, 20009 Donostia-San Sebastian, Spain.,Departamento de Química Física, Universidade de Vigo , 36310 Vigo, Spain
| | - Daniele Zanaga
- EMAT, University of Antwerp , Groenenborgerlaan 171, B-2020 Antwerp, Belgium
| | - Thomas Altantzis
- EMAT, University of Antwerp , Groenenborgerlaan 171, B-2020 Antwerp, Belgium
| | | | | | - Jorge Pérez-Juste
- Departamento de Química Física, Universidade de Vigo , 36310 Vigo, Spain
| | - Sara Bals
- EMAT, University of Antwerp , Groenenborgerlaan 171, B-2020 Antwerp, Belgium
| | - Luis M Liz-Marzán
- Bionanoplasmonics Laboratory, CIC biomaGUNE , Paseo de Miramón 182, 20009 Donostia-San Sebastian, Spain.,Departamento de Química Física, Universidade de Vigo , 36310 Vigo, Spain.,Ikerbasque, Basque Foundation for Science , 48013 Bilbao, Spain
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48
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Slater TJA, Lewis EA, Haigh SJ. Energy Dispersive X-ray Tomography for 3D Elemental Mapping of Individual Nanoparticles. J Vis Exp 2016. [PMID: 27403838 PMCID: PMC4993322 DOI: 10.3791/52815] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Energy dispersive X-ray spectroscopy within the scanning transmission electron microscope (STEM) provides accurate elemental analysis with high spatial resolution, and is even capable of providing atomically resolved elemental maps. In this technique, a highly focused electron beam is incident upon a thin sample and the energy of emitted X-rays is measured in order to determine the atomic species of material within the beam path. This elementally sensitive spectroscopy technique can be extended to three dimensional tomographic imaging by acquiring multiple spectrum images with the sample tilted along an axis perpendicular to the electron beam direction. Elemental distributions within single nanoparticles are often important for determining their optical, catalytic and magnetic properties. Techniques such as X-ray tomography and slice and view energy dispersive X-ray mapping in the scanning electron microscope provide elementally sensitive three dimensional imaging but are typically limited to spatial resolutions of > 20 nm. Atom probe tomography provides near atomic resolution but preparing nanoparticle samples for atom probe analysis is often challenging. Thus, elementally sensitive techniques applied within the scanning transmission electron microscope are uniquely placed to study elemental distributions within nanoparticles of dimensions 10-100 nm. Here, energy dispersive X-ray (EDX) spectroscopy within the STEM is applied to investigate the distribution of elements in single AgAu nanoparticles. The surface segregation of both Ag and Au, at different nanoparticle compositions, has been observed.
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49
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Collins G, Holmes JD. Engineering Metallic Nanoparticles for Enhancing and Probing Catalytic Reactions. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2016; 28:5689-5695. [PMID: 26823380 DOI: 10.1002/adma.201503970] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2015] [Revised: 09/26/2015] [Indexed: 06/05/2023]
Abstract
Recent developments in tailoring the structural and chemical properties of colloidal metal nanoparticles (NPs) have led to significant enhancements in catalyst performance. Controllable colloidal synthesis has also allowed tailor-made NPs to serve as mechanistic probes for catalytic processes. The innovative use of colloidal NPs to gain fundamental insights into catalytic function will be highlighted across a variety of catalytic and electrocatalytic applications. The engineering of future heterogenous catalysts is also moving beyond size, shape and composition considerations. Advancements in understanding structure-property relationships have enabled incorporation of complex features such as tuning surface strain to influence the behavior of catalytic NPs. Exploiting plasmonic properties and altering colloidal surface chemistry through functionalization are also emerging as important areas for rational design of catalytic NPs. This news article will highlight the key developments and challenges to the future design of catalytic NPs.
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Affiliation(s)
- Gillian Collins
- Chemistry Department, and Tyndall National Institute, University College Cork, Cork, Ireland
- CRANN@AMBER, Trinity College Dublin, Dublin 2, Ireland
| | - Justin D Holmes
- Chemistry Department, and Tyndall National Institute, University College Cork, Cork, Ireland
- CRANN@AMBER, Trinity College Dublin, Dublin 2, Ireland
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50
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da Silva AGM, Rodrigues TS, Correia VG, Alves TV, Alves RS, Ando RA, Ornellas FR, Wang J, Andrade LH, Camargo PHC. Plasmonic Nanorattles as Next-Generation Catalysts for Surface Plasmon Resonance-Mediated Oxidations Promoted by Activated Oxygen. Angew Chem Int Ed Engl 2016; 55:7111-5. [PMID: 27159199 DOI: 10.1002/anie.201601740] [Citation(s) in RCA: 67] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2016] [Indexed: 01/16/2023]
Abstract
Nanorattles, comprised of a nanosphere inside a nanoshell, were employed as the next generation of plasmonic catalysts for oxidations promoted by activated O2 . After investigating how the presence of a nanosphere inside a nanoshell affected the electric-field enhancements in the nanorattle relative to a nanoshell and a nanosphere, the SPR-mediated oxidation of p-aminothiophenol (PATP) functionalized at their surface was investigated to benchmark how these different electric-field intensities affected the performances of Au@AgAu nanorattles, AgAu nanoshells and Au nanoparticles having similar sizes. The high performance of the nanorattles enabled the visible-light driven synthesis of azobenzene from aniline under ambient conditions. As the nanorattles allow the formation of electromagnetic hot spots without relying on the uncontrolled aggregation of nanostructures, it enables their application as catalysts in liquid phase under mild conditions using visible light as the main energy input.
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Affiliation(s)
- Anderson G M da Silva
- Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes, 748, 05508-000, São Paulo-SP, Brazil
| | - Thenner S Rodrigues
- Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes, 748, 05508-000, São Paulo-SP, Brazil
| | - Valquírio G Correia
- Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes, 748, 05508-000, São Paulo-SP, Brazil
| | - Tiago V Alves
- Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes, 748, 05508-000, São Paulo-SP, Brazil
| | - Rafael S Alves
- Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes, 748, 05508-000, São Paulo-SP, Brazil
| | - Rômulo A Ando
- Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes, 748, 05508-000, São Paulo-SP, Brazil
| | - Fernando R Ornellas
- Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes, 748, 05508-000, São Paulo-SP, Brazil
| | - Jiale Wang
- Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes, 748, 05508-000, São Paulo-SP, Brazil.,College of Science, Donghua University, Shanghai, 201620, P.R. China
| | - Leandro H Andrade
- Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes, 748, 05508-000, São Paulo-SP, Brazil
| | - Pedro H C Camargo
- Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes, 748, 05508-000, São Paulo-SP, Brazil.
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