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Osmani I, Hamidouche M, Demagh NE, Guechi A, Cottrino S, Soltani MT, Manseri A. Insights on the effect of process conditions on the optical properties of silver ion exchanged soda-lime silicate glass. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2024; 36:315001. [PMID: 38653256 DOI: 10.1088/1361-648x/ad4227] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2024] [Accepted: 04/23/2024] [Indexed: 04/25/2024]
Abstract
The effects of ion exchange time and temperature on the optical properties and plasmonic response of silver ion exchanged soda-lime silicate glass were investigated using scanning electron microscopy (SEM) in energy dispersive spectrometry (EDS) configuration, m-lines spectroscopy, photoluminescence (PL) spectroscopy, and UV-visible absorption spectroscopy. SEM analyses in EDS mode provided profiles of silver oxide molar concentration. These profiles were directly correlated to the silver diffusion coefficient using an adjustment procedure. The effective indices of ion exchanged glasses measured by the standard prism coupling technique (m-lines) allowed access to refractive index distributions in ion exchange regions. These ion-exchanged glasses underwent evaluation to determine their potential suitability for use in multimode planar systems. The PL results acquired after ion exchange demonstrated that the creation of Ag0atoms from Ag+ions was responsible for the decline and quenching of PL intensity at ion exchange times and temperatures increase. Silver nanoparticles were generated in the samples subjected to ion exchange at 480 °C without the need for post-exchange treatments. The emergence of the surface plasmon resonance band around 427 nm in the optical absorption spectra confirmed the formation of Ag nanoparticles in annealed glasses. Estimates of the UV-visible absorption spectra indicated an average size of silver nanoparticles ranging from 1.8 to 2.4 nm.
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Affiliation(s)
- Ismahen Osmani
- Emerging Materials Research Unit, Ferhat Abbas University 1, Setif 19000, Algeria
- Institute of Optics and Precision Mechanics (IOMP), Ferhat Abbas University 1, Setif 19000, Algeria
- Research Unite in Optics and Photonics (UROP), Setif, Center for Development of Advanced Technologies (CDTA), Baba Hassen, Algiers, Algeria
| | - Mohamed Hamidouche
- Emerging Materials Research Unit, Ferhat Abbas University 1, Setif 19000, Algeria
- Institute of Optics and Precision Mechanics (IOMP), Ferhat Abbas University 1, Setif 19000, Algeria
| | - Nacer-Eddine Demagh
- Institute of Optics and Precision Mechanics (IOMP), Ferhat Abbas University 1, Setif 19000, Algeria
| | - Abla Guechi
- Institute of Optics and Precision Mechanics (IOMP), Ferhat Abbas University 1, Setif 19000, Algeria
| | - Sandrine Cottrino
- Laboratory of MATEIS, CNRS UMR 5510, INSA Lyon, 69621 Villeurbanne Cedex, France
| | - Mohamed Toufik Soltani
- Laboratory of Photonic Physics and Multifunctional Nanomaterials, Mohamed Khider University, BP 145 RP, 07000 Biskra, Algeria
| | - Amar Manseri
- Research Center in Semiconductor Technology for Energetics, CRTSE-TESE-02, Algiers, Algeria
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2
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Skvortsov AN, Ilyechova EY, Puchkova LV. Chemical background of silver nanoparticles interfering with mammalian copper metabolism. JOURNAL OF HAZARDOUS MATERIALS 2023; 451:131093. [PMID: 36905906 DOI: 10.1016/j.jhazmat.2023.131093] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Revised: 02/22/2023] [Accepted: 02/24/2023] [Indexed: 06/18/2023]
Abstract
The rapidly increasing application of silver nanoparticles (AgNPs) boosts their release into the environment, which raises a reasonable alarm for ecologists and health specialists. This is manifested as increased research devoted to the influence of AgNPs on physiological and cellular processes in various model systems, including mammals. The topic of the present paper is the ability of silver to interfere with copper metabolism, the potential health effects of this interference, and the danger of low silver concentrations to humans. The chemical properties of ionic and nanoparticle silver, supporting the possibility of silver release by AgNPs in extracellular and intracellular compartments of mammals, are discussed. The possibility of justified use of silver for the treatment of some severe diseases, including tumors and viral infections, based on the specific molecular mechanisms of the decrease in copper status by silver ions released from AgNPs is also discussed.
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Affiliation(s)
- Alexey N Skvortsov
- Graduate School of Biomedical Systems and Technologies, Institute of Biomedical Systems and Biotechnology, Peter the Great St. Petersburg Polytechnic University, Saint Petersburg 195251, Russia; Laboratory of Molecular Biology of Stem Cells, Institute of Cytology of the Russian Academy of Sciences, Saint Petersburg 194064, Russia
| | - Ekaterina Yu Ilyechova
- Graduate School of Biomedical Systems and Technologies, Institute of Biomedical Systems and Biotechnology, Peter the Great St. Petersburg Polytechnic University, Saint Petersburg 195251, Russia; Department of Molecular Genetics, Institute of Experimental Medicine of the Russian Academy of Sciences, Saint Petersburg 197376, Russia; Research Center of Advanced Functional Materials and Laser Communication Systems (RC AFMLCS), ITMO University, Saint Petersburg 197101, Russia.
| | - Ludmila V Puchkova
- Graduate School of Biomedical Systems and Technologies, Institute of Biomedical Systems and Biotechnology, Peter the Great St. Petersburg Polytechnic University, Saint Petersburg 195251, Russia; Department of Molecular Genetics, Institute of Experimental Medicine of the Russian Academy of Sciences, Saint Petersburg 197376, Russia; Research Center of Advanced Functional Materials and Laser Communication Systems (RC AFMLCS), ITMO University, Saint Petersburg 197101, Russia
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3
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Peng B, Zhou JF, Ding M, Shan BQ, Chen T, Zhang K. Structural water molecules dominated p band intermediate states as a unified model for the origin on the photoluminescence emission of noble metal nanoclusters: from monolayer protected clusters to cage confined nanoclusters. SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS 2023; 24:2210723. [PMID: 37205011 PMCID: PMC10187113 DOI: 10.1080/14686996.2023.2210723] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Revised: 04/29/2023] [Accepted: 04/29/2023] [Indexed: 05/21/2023]
Abstract
In the past several decades, noble metal nanoclusters (NMNCs) have been developed as an emerging class of luminescent materials due to their superior photo-stability and biocompatibility, but their luminous quantum yield is relatively low and the physical origin of the bright photoluminescence (PL) of NMNCs remain elusive, which limited their practical application. As the well-defined structure and composition of NMNCs have been determined, in this mini-review, the effect of each component (metal core, ligand shell and interfacial water) on their PL properties and corresponded working mechanism were comprehensively introduced, and a model that structural water molecules dominated p band intermediate state was proposed to give a unified understanding on the PL mechanism of NMNCs and a further perspective to the future developments of NMNCs by revisiting the development of our studies on the PL mechanism of NMNCs in the past decade.
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Affiliation(s)
- Bo Peng
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, College of Chemistry and Molecular Engineering, East China Normal University, Shanghai, China
| | - Jia-Feng Zhou
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, College of Chemistry and Molecular Engineering, East China Normal University, Shanghai, China
| | - Meng Ding
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, College of Chemistry and Molecular Engineering, East China Normal University, Shanghai, China
| | - Bing-Qian Shan
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, College of Chemistry and Molecular Engineering, East China Normal University, Shanghai, China
| | - Tong Chen
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, College of Chemistry and Molecular Engineering, East China Normal University, Shanghai, China
| | - Kun Zhang
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, College of Chemistry and Molecular Engineering, East China Normal University, Shanghai, China
- Laboratoire de chimie, Ecole Normale Supérieure de Lyon, Institut de Chimie de Lyon, Université de Lyon, Lyon, France
- Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, Shandong, PR China
- Institute of Eco-Chongming, Shanghai, China
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4
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Abstract
Nucleation and growth are critical steps in crystallization, which plays an important role in determining crystal structure, size, morphology, and purity. Therefore, understanding the mechanisms of nucleation and growth is crucial to realize the controllable fabrication of crystalline products with desired and reproducible properties. Based on classical models, the initial crystal nucleus is formed by the spontaneous aggregation of ions, atoms, or molecules, and crystal growth is dependent on the monomer's diffusion and the surface reaction. Recently, numerous in situ investigations on crystallization dynamics have uncovered the existence of nonclassical mechanisms. This review provides a summary and highlights the in situ studies of crystal nucleation and growth, with a particular emphasis on the state-of-the-art research progress since the year 2016, and includes technological advances, atomic-scale observations, substrate- and temperature-dependent nucleation and growth, and the progress achieved in the various materials: metals, alloys, metallic compounds, colloids, and proteins. Finally, the forthcoming opportunities and challenges in this fascinating field are discussed.
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Affiliation(s)
- Junjie Li
- Key Laboratory of Functional Materials and Devices for Special Environments, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences, Xinjiang Key Laboratory of Electronic Information Materials and Devices, 40-1 South Beijing Road, Urumqi830011, China.,Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing100049, China
| | - Francis Leonard Deepak
- Nanostructured Materials Group, International Iberian Nanotechnology Laboratory (INL), Av. Mestre Jose Veiga, 4715-330Braga, Portugal
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5
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Babich E, Reduto I, Lipovskii A. Diffusive Formation of Au/Ag Alloy Nanoparticles of Governed Composition in Glass. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:4202. [PMID: 36500825 PMCID: PMC9738725 DOI: 10.3390/nano12234202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/07/2022] [Revised: 11/20/2022] [Accepted: 11/23/2022] [Indexed: 06/17/2023]
Abstract
For the first time we show that the introduction of silver ions in the glass containing gold nanoparticles (NPs) and additional heat treatment of the glass in the air lead to the formation of Au/Ag alloy NPs. The proposed approach makes it possible to position localized surface plasmon resonance of the NPs by selecting the heat treatment temperature, which determines the silver proportion in the alloy NPs. This allows for expanding customizability of NPs for applications in surface-enhanced Raman scattering spectroscopy, catalysis and biochemistry. Developed technique benefits from the presence of silver in the glass in ionic form, which prevents the oxidation of silver and provides stable preparation of Au/Ag alloy NPs.
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Affiliation(s)
- Ekaterina Babich
- Laboratory of Nanophotonics, Alferov University, Khlopina 8/3, 194021 Saint Petersburg, Russia
| | - Igor Reduto
- Laboratory of Nanophotonics, Alferov University, Khlopina 8/3, 194021 Saint Petersburg, Russia
| | - Andrey Lipovskii
- Laboratory of Nanophotonics, Alferov University, Khlopina 8/3, 194021 Saint Petersburg, Russia
- Institute of Physics and Mechanics, Peter the Great St. Petersburg Polytechnic University, Polytechnicheskaya 29, 195251 Saint Petersburg, Russia
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Sun L, Keshavarz M, Romolini G, Dieu B, Hofkens J, de Jong F, Fron E, Roeffaers MBJ, Van der Auweraer M. Origin of the polychromatic photoluminescence of zeolite confined Ag clusters: temperature- and co-cation-dependent luminescence. Chem Sci 2022; 13:11560-11569. [PMID: 36320393 PMCID: PMC9555561 DOI: 10.1039/d2sc03197c] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Accepted: 08/17/2022] [Indexed: 08/22/2023] Open
Abstract
Zeolite confined silver clusters (AgCLs) have attracted extensive attention due to their remarkable luminescent properties, but the elucidation of the underlying photophysical processes and especially the excited-state dynamics remains a challenge. Herein, we investigate the bright photoluminescence of AgCLs confined in Linde Type A zeolites (LTA) by systematically varying the temperature (298-77 K) and co-cation composition (Li/Na) and examining their respective influence on the steady-state and time-resolved photoluminescence. The observed polychromatic emission of the tetrahedral Ag4(H2O) n 2+ clusters ranges from orange to violet and three distinct emitting species are identified, corresponding to three long-lived triplet states populated consecutively and separated by a small energy barrier. These long-lived species are at the origin of the polychromatic luminescence with high photoluminescence quantum yields. Furthermore, the Li-content dependence of decay times points to the importance of guest-host-guest interactions in tuning the luminescent properties with a 43% decrease of the dominating decay time by increasing Li content. Based on our findings, a simplified model for the photophysical kinetics is proposed that identifies the excited-state processes. The results outlined here pave the way for a rational design of confined metal clusters in various frames and inspire the specified applications of Ag-zeolites.
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Affiliation(s)
- Li Sun
- Chem&Tech - Molecular Imaging and Photonics, KU Leuven Celestijnenlaan 200F 3001 Leuven Belgium
| | - Masoumeh Keshavarz
- Chem&Tech - Molecular Imaging and Photonics, KU Leuven Celestijnenlaan 200F 3001 Leuven Belgium
| | - Giacomo Romolini
- Chem&Tech - Molecular Imaging and Photonics, KU Leuven Celestijnenlaan 200F 3001 Leuven Belgium
| | - Bjorn Dieu
- Chem&Tech - Molecular Imaging and Photonics, KU Leuven Celestijnenlaan 200F 3001 Leuven Belgium
| | - Johan Hofkens
- Chem&Tech - Molecular Imaging and Photonics, KU Leuven Celestijnenlaan 200F 3001 Leuven Belgium
- KU Leuven Core Facility for Advanced Spectroscopy Celestijnenlaan 200F 3001 Leuven Belgium
| | - Flip de Jong
- Chem&Tech - Molecular Imaging and Photonics, KU Leuven Celestijnenlaan 200F 3001 Leuven Belgium
| | - Eduard Fron
- Chem&Tech - Molecular Imaging and Photonics, KU Leuven Celestijnenlaan 200F 3001 Leuven Belgium
- KU Leuven Core Facility for Advanced Spectroscopy Celestijnenlaan 200F 3001 Leuven Belgium
| | - Maarten B J Roeffaers
- Chem&Tech - Centre for Membrane Separations, Adsorption, Catalysis and Spectroscopy for Sustainable Solutions, KU Leuven Celestijnenlaan 200F 3001 Leuven Belgium
| | - Mark Van der Auweraer
- Chem&Tech - Molecular Imaging and Photonics, KU Leuven Celestijnenlaan 200F 3001 Leuven Belgium
- KU Leuven Core Facility for Advanced Spectroscopy Celestijnenlaan 200F 3001 Leuven Belgium
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Electrically Tunable Solution-Processed Transparent Conductive Thin Films Based on Colloidally Dispersed ITO@Ag Composite Ink. NANOMATERIALS 2022; 12:nano12122060. [PMID: 35745397 PMCID: PMC9231198 DOI: 10.3390/nano12122060] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/17/2022] [Revised: 05/31/2022] [Accepted: 06/09/2022] [Indexed: 11/17/2022]
Abstract
Silver (Ag) introduced colloidal Sn-doped In2O3 (ITO) ink for transparent conductive electrodes (TCEs) was prepared to overcome the limitation of colloidally prepared thin film; low density thin film, high resistance. ITO@Ag colloid ink was made by controlling the weight ratio of ITO and Ag nanoparticles through ball-milling and fabricated using spin coating. These films were dried at 220 °C and heat-treated at 450−750 °C in an air atmosphere to pyrolyze the organic ligand attached to the nanoparticles. All thin films showed high crystallinity. As the thermal treatment temperature increased, films showed a cracked surface, but as the weight percentage of silver increased, a flattened and smooth surface appeared, caused by the metallic silver filling the gap between the nano-particles. This worked as a bridge to allow electrical conduction, which decreases the resistivity over an order of magnitude, from 309 to 0.396, and 0.107 Ω·cm for the ITO-220 °C, ITO-750 °C, and ITO@Ag (7.5 wt.%)-750 °C, respectively. These films also exhibited >90% optical transparency. Lowered resistivity is caused due to the inclusion of silver, providing a sufficient number of charge carriers. Furthermore, the work function difference between ITO and silver builds an ohmic junction, allowing fluent electrical flow without any barrier.
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Konidakis I, Karagiannaki A, Stratakis E. Advanced composite glasses with metallic, perovskite, and two-dimensional nanocrystals for optoelectronic and photonic applications. NANOSCALE 2022; 14:2966-2989. [PMID: 35142770 DOI: 10.1039/d1nr07711b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
This article reviews the tremendous advancement of the optoelectronic and photonic properties of inorganic oxide glasses upon the incorporation of metallic, perovskite, and two-dimensional nanocrystals within their matrix. In the first part, we present the exploitation of typical inorganic oxide glasses as hosting platforms for the incorporation of metallic nanoparticles. Such a method offers tremendous advantages in terms of inducing plasmonic features that enable the tunability of the photonic properties of the embedded materials. Along similar lines, due to their exceptional photoluminescence properties all inorganic lead halide perovskites show enormous potential for next generation light-emitting, optoelectronic and photonic devices. To date, however, their usage is limited significantly by their poor chemical stability upon exposure to moisture, and lead toxicity issues. A recent and highly promising approach for overcoming these important challenges is the encapsulation of perovskite nanocrystals within inorganic oxide glasses. Based on this, in the second section we focus on the recent advancements in perovskite glasses in terms of the developed fabrication procedures and the resulting optoelectronic features, while considering the production limitations. In the last part, we consider the development of composite two-dimensional materials glass architectures in terms of the available synthesis routes and the novelty of their optical and emission features. Finally, future perspectives on the described composite glass systems in terms of potential applications are summarized.
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Affiliation(s)
- I Konidakis
- Institute of Electronic Structure and Laser (IESL), Foundation for Research and Technology-Hellas (FORTH), 70013 Heraklion-Crete, Greece.
| | - A Karagiannaki
- Institute of Electronic Structure and Laser (IESL), Foundation for Research and Technology-Hellas (FORTH), 70013 Heraklion-Crete, Greece.
| | - E Stratakis
- Institute of Electronic Structure and Laser (IESL), Foundation for Research and Technology-Hellas (FORTH), 70013 Heraklion-Crete, Greece.
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Sharma D, Chaudhary A. Synthesis of Quercetin Functionalized Silver Nanoparticles and Their Application for the Colorimetric Detection of L‐Cysteine in Biologically Complex Fluids. ChemistrySelect 2022. [DOI: 10.1002/slct.202104147] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Deepak Sharma
- Department of Biotechnology and Bioinformatics Jaypee University of Information Technology Waknaghat Solan India
| | - Abhishek Chaudhary
- Department of Biotechnology and Bioinformatics Jaypee University of Information Technology Waknaghat Solan India
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10
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Feng X, Yue Y, Qiu J, Jain H, Zhou S. Entropy Engineering in Inorganic Non-metallic Glass. FUNDAMENTAL RESEARCH 2022. [DOI: 10.1016/j.fmre.2022.01.030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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11
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Wu Y, Lin H, Li R, Lin S, Wu C, Huang Q, Xu J, Cheng Y, Wang Y. Laser-direct-writing of molecule-like Ag mx+ nanoclusters in transparent tellurite glass for 3D volumetric optical storage. NANOSCALE 2021; 13:19663-19670. [PMID: 34816864 DOI: 10.1039/d1nr05360d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
In situ constructing program-designed nanostructures via laser-direct-writing (LDW) has proved to be a reliable strategy for optical storage (OS). Herein, a kind of low-melting Ag+-doped TeO2-ZnO-Na2O (TZN) tellurite glass has been demonstrated as an ideal LDW OS medium. Microstructural and spectroscopic studies reveal the generation of molecule-like Agmx+ nanoclusters featured with a broad emission band in the orange-red region upon laser irradiation. Probing the laser-glass interaction yields evidences of the spatial distribution of Ag species responsive to laser-induced thermoelastic pressure wave oscillation, as well as the heat-driven migration/aggregation of Ag species along the radial direction of the laser spot. Raman analyses disclose the loose network of TZN-glass convenient for Ag+ mobility and the increased network connectivity when Agmx+ nanoclusters are precipitated out. Combined with the XPS result of Ag+ → Ag0 reduction, the possible formation mechanism of Ag nanoclusters stabilized in glass has been proposed. In a proof-of-concept experiment, 3D volumetric OS in the TZN glass has been demonstrated, showing optical data encoding/decoding in the form of characters and image patterns.
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Affiliation(s)
- Yaman Wu
- Key Laboratory of Optoelectronic Materials Chemistry and Physics, Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, P. R. China.
- University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Hang Lin
- Key Laboratory of Optoelectronic Materials Chemistry and Physics, Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, P. R. China.
- Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou, Fujian, 350108, P. R. China
| | - Renfu Li
- Key Laboratory of Optoelectronic Materials Chemistry and Physics, Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, P. R. China.
| | - Shisheng Lin
- Key Laboratory of Optoelectronic Materials Chemistry and Physics, Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, P. R. China.
- Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou, Fujian, 350108, P. R. China
| | - Chuxin Wu
- Key Laboratory of Optoelectronic Materials Chemistry and Physics, Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, P. R. China.
| | - Qiugui Huang
- Key Laboratory of Optoelectronic Materials Chemistry and Physics, Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, P. R. China.
| | - Ju Xu
- Key Laboratory of Optoelectronic Materials Chemistry and Physics, Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, P. R. China.
- Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou, Fujian, 350108, P. R. China
| | - Yao Cheng
- Key Laboratory of Optoelectronic Materials Chemistry and Physics, Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, P. R. China.
- Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou, Fujian, 350108, P. R. China
| | - Yuansheng Wang
- Key Laboratory of Optoelectronic Materials Chemistry and Physics, Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, P. R. China.
- Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou, Fujian, 350108, P. R. China
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Zhou R, Calahoo C, Ding Y, Wondraczek L. Role of Ag + Ions in Determining Ce 3+ Optical Properties in Fluorophosphate and Sulfophosphate Glasses. ACS OMEGA 2021; 6:30093-30107. [PMID: 34778681 PMCID: PMC8582266 DOI: 10.1021/acsomega.1c04933] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/07/2021] [Accepted: 09/30/2021] [Indexed: 06/13/2023]
Abstract
Understanding the interactions among dopant species and the role of the host lattice is of fundamental importance for the chemical formulation of optically active glasses. Here, we consider the archetypal dopant pair of Ag-Ce in complex fluorophosphate (PF) and sulfophosphate (PS) matrices, in which variable bonding environments and ligand selectivity exert distinct effects on dopant properties. The addition of Ag+ to PF glasses blue-shifts the ultraviolet (UV) cutoff wavelength of Ce3+ and enhances its photoluminescence (PL) intensity. In PS matrices, the exact opposite effect is observed: red-shifting the UV cutoff and lowering the PL intensity. No Ag-Ag pairs or cluster species were found in either matrix material; however, in PS, such clustering could be triggered by secondary broad-band UV-visible irradiation. The optical properties of Ag-Ce-codoped glasses are a result of the ionocovalent character of the Ag+-O-Ce3+ bond, the cross-relaxation process between Ag+ and Ce3+, and the redox ratio of Ce3+/Ce4+. In the PF glasses, the enhancement of the Ce3+ PL intensity is due to energy transfer from Ag+ to Ce3+ and a redox shift from Ce4+ to Ce3+. The more covalent Ag+-O-Ce3+ interactions in the PS series decrease the Ce3+/Ce4+ ratio. Moreover, photoinduced Ag clustering is facilitated in the more covalent environment, which indicates that glasses commonly used for Ag nanoparticle formation, such as silicate glasses, also possess more covalent Ag+-O bonding.
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Reduto I, Babich E, Zolotovskaya S, Abdolvand A, Lipovskii A, Zhurikhina V. Controlled metallization of ion-exchanged glasses by thermal poling. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33:505001. [PMID: 34530412 DOI: 10.1088/1361-648x/ac276c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Accepted: 09/15/2021] [Indexed: 05/27/2023]
Abstract
We present studies of the formation of silver nanoparticles (NPs) in silver-sodium ion-exchanged glasses by a combination of thermal poling and nanosecond pulsed laser irradiation at 355 nm. In poling, silver ions drift deeper into the glass and become separated from the glass surface by a poled layer depleted in cations. Performed measurements have indicated poling-induced broadening of silver ions depth distribution. Laser irradiation reduces silver ions to atomic silver via breaking silver-non-bridging oxygen (NBO) bonds, extraction of electrons from the NBO atoms and capturing these electrons and electrons generated via multi-photon absorption in the glass by silver ions. The depleted layer limits diffusion of silver atom towards glass surface and, as a consequence, formation of silver NPs on the surface of poled glasses. It is shown that thermal poling mode allows one to control formation of silver NPs of glass surface.
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Affiliation(s)
- Igor Reduto
- Institute of Photonics, Department of Physics and Mathematics, University of Eastern Finland, Joensuu 80101, Finland
| | - Ekaterina Babich
- Laboratory of Multifunctional Glassy Materials, Peter the Great St. Petersburg Polytechnic University, St. Petersburg 195251, Russia
| | - Svetlana Zolotovskaya
- Materials Science and Engineering Research Cluster, School of Science and Engineering, University of Dundee, Dundee DD1 4HN, United Kingdom
| | - Amin Abdolvand
- Materials Science and Engineering Research Cluster, School of Science and Engineering, University of Dundee, Dundee DD1 4HN, United Kingdom
| | - Andrey Lipovskii
- Laboratory of Multifunctional Glassy Materials, Peter the Great St. Petersburg Polytechnic University, St. Petersburg 195251, Russia
| | - Valentina Zhurikhina
- Laboratory of Multifunctional Glassy Materials, Peter the Great St. Petersburg Polytechnic University, St. Petersburg 195251, Russia
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14
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Silver plasmonic colour change due to chemical/mechanical reactions. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.127221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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15
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Berneschi S, D'Andrea C, Baldini F, Banchelli M, de Angelis M, Pelli S, Pini R, Pugliese D, Boetti NG, Janner D, Milanese D, Giannetti A, Matteini P. Ion-exchanged glass microrods as hybrid SERS/fluorescence substrates for molecular beacon-based DNA detection. Anal Bioanal Chem 2021; 413:6171-6182. [PMID: 34278523 DOI: 10.1007/s00216-021-03418-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Revised: 05/07/2021] [Accepted: 05/19/2021] [Indexed: 11/26/2022]
Abstract
Ion-exchange in molten nitrate salts containing metal ions (i.e. silver, copper, etc.) represents a well-established technique able to modify the chemical-physical properties of glass materials. It is widely used not only in the field of integrated optics (IO) but also, more recently, in plasmonics due to the possibility to induce the formation of metal nanoparticles in the glass matrix by an ad hoc thermal post-process. In this work, the application of this technology for the realisation of low-cost and stable surface-enhanced Raman scattering (SERS) active substrates, based on soda-lime glass microrods, is reported. The microrods, with a radius of a few tens of microns, were obtained by cutting the end of an ion-exchanged soda-lime fibre for a length less than 1 cm. As ion source, silver nitrate was selected due to the outstanding SERS properties of silver. The ion-exchange and thermal annealing post-process parameters were tuned to expose the embedded silver nanoparticles on the surface of the glass microrods, avoiding the use of any further chemical etching step. In order to test the combined SERS/fluorescence response of these substrates, labelled molecular beacons (MBs) were immobilised on their surface for deoxyribonucleic acid (DNA) detection. Our experiments confirm that target DNA is attached on the silver nanoparticles and its presence is revealed by both SERS and fluorescence measurements. These results pave the way towards the development of low-cost and stable hybrid fibres, in which SERS and fluorescence interrogation techniques are combined in the same optical device.
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Affiliation(s)
- Simone Berneschi
- Institute of Applied Physics "Nello Carrara", IFAC - CNR, Via Madonna del Piano 10, 50019, Sesto Fiorentino, FI, Italy
| | - Cristiano D'Andrea
- Institute of Applied Physics "Nello Carrara", IFAC - CNR, Via Madonna del Piano 10, 50019, Sesto Fiorentino, FI, Italy
| | - Francesco Baldini
- Institute of Applied Physics "Nello Carrara", IFAC - CNR, Via Madonna del Piano 10, 50019, Sesto Fiorentino, FI, Italy
| | - Martina Banchelli
- Institute of Applied Physics "Nello Carrara", IFAC - CNR, Via Madonna del Piano 10, 50019, Sesto Fiorentino, FI, Italy
| | - Marella de Angelis
- Institute of Applied Physics "Nello Carrara", IFAC - CNR, Via Madonna del Piano 10, 50019, Sesto Fiorentino, FI, Italy
| | - Stefano Pelli
- Institute of Applied Physics "Nello Carrara", IFAC - CNR, Via Madonna del Piano 10, 50019, Sesto Fiorentino, FI, Italy
| | - Roberto Pini
- Institute of Applied Physics "Nello Carrara", IFAC - CNR, Via Madonna del Piano 10, 50019, Sesto Fiorentino, FI, Italy
| | - Diego Pugliese
- Department of Applied Science and Technology and RU INSTM, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Turin, Italy
| | - Nadia G Boetti
- Fondazione LINKS-Leading Innovation and Knowledge for Society, via P. C. Boggio 61, 10138, Turin, Italy
| | - Davide Janner
- Department of Applied Science and Technology and RU INSTM, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Turin, Italy
| | - Daniel Milanese
- Department of Engineering and Architecture and RU INSTM, Università di Parma, Parco Area delle Scienze 181/A, 43124, Parma, Italy
| | - Ambra Giannetti
- Institute of Applied Physics "Nello Carrara", IFAC - CNR, Via Madonna del Piano 10, 50019, Sesto Fiorentino, FI, Italy.
| | - Paolo Matteini
- Institute of Applied Physics "Nello Carrara", IFAC - CNR, Via Madonna del Piano 10, 50019, Sesto Fiorentino, FI, Italy
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16
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Kumar P, Chandra Mathpal M, Jagannath G, Prakash J, Maze JR, Roos WD, Swart HC. Optical limiting applications of resonating plasmonic Au nanoparticles in a dielectric glass medium. NANOTECHNOLOGY 2021; 32:345709. [PMID: 33962405 DOI: 10.1088/1361-6528/abfee6] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2021] [Accepted: 05/07/2021] [Indexed: 06/12/2023]
Abstract
Plasmonic nanostructures exhibiting high optical nonlinearities are widely used in the rapidly growing modern nanotechnology of nonlinear optics including biomedical applications due to their tunable plasmonic behavior. In this work, we investigate the nonlinear optical properties of uniformly distributed Au nanoparticles (NPs) embedded in pre-synthesized sodium-zinc borate glass by the well-known ion-exchange technique for optical limiting (OL) applications. Various techniques such as optical absorption spectroscopy, x-ray photoelectron spectroscopy, Transmission Electron Microscope (TEM), Photoluminescence, Time of Flight secondary mass spectroscopy and the Z scan technique were used for the characterization of these NPs. TEM confirmed spherically shaped Au NPs with varying sizes of up to 16 nm, in agreement with optical absorption spectroscopy. Nonlinear optical (NLO) properties of these Au NPs were investigated by using an open as well as close aperture Z scan technique which exhibited enhanced optical nonlinearities. The two-photon absorption (2PA) coefficients demonstrated an increasing trend while the OL threshold values demonstrated a decreasing trend as a function of heat treatment. The improved 2PA coefficients and decreased OL threshold values endorsed the Au NPs containing glasses as contending materials for the fabrication of promising optical limiters for the protection of eyes and other sensitive instruments from laser induced damages.
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Affiliation(s)
- Promod Kumar
- Department of Physics, University of the Free State, Bloemfontein, ZA9300, South Africa
| | - Mohan Chandra Mathpal
- Instituto de Física, Pontificia Universidad Católica de Chile, Casilla 306, Santiago, Chile
| | - Gangareddy Jagannath
- Department of Physics, K S Institute of Technology, Bengaluru 560109, Karnataka, India
| | - Jai Prakash
- Department of Chemistry, National Institute of Technology Hamirpur, Hamirpur-177005 (H.P), India
| | - Jero-R Maze
- Instituto de Física, Pontificia Universidad Católica de Chile, Casilla 306, Santiago, Chile
| | - W D Roos
- Department of Physics, University of the Free State, Bloemfontein, ZA9300, South Africa
| | - H C Swart
- Department of Physics, University of the Free State, Bloemfontein, ZA9300, South Africa
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17
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Wang X, Zhang G, Li G, Lou R, Sun Z, Xie X, Li W, Cheng G. Effects of CeO 2 and Sb 2O 3 on the Nonlinear Photochemical Process in Ultrashort Laser Gaussian-Bessel Beams Irradiated Photo-Thermo-Refractive Glass. MICROMACHINES 2021; 12:mi12060615. [PMID: 34073636 PMCID: PMC8229932 DOI: 10.3390/mi12060615] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 05/25/2021] [Accepted: 05/25/2021] [Indexed: 11/16/2022]
Abstract
Microfluidic chips and optical elements can be fabricated based on the nonlinear photosensitivity in photo-thermo-refractive (PTR) glass by controlling the growth of nanocrystals in the femtosecond (fs) laser-irradiated region. Here, we focus on CeO2 and Sb2O3 that play important roles in UV irradiation, experimentally investigate the effects of the dopants on the nonlinear photochemical process in PTR glass triggered by fs Gaussian-Bessel beams. The results show that the generation of Ag0 atoms and the Ag nanoparticles can be improved by CeO2 and Sb2O3 co-doping. Besides, each multivalent ion in PTR glass possibly participates in the electron transfer processes and contributes to the generation of Ag0 atoms. Finally, X-ray diffraction analysis reveals the precipitation of NaF nanocrystals with an average size of 10 to 12 nm after laser irradiation and thermal treatment, which is unrelated to the dopants.
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Affiliation(s)
- Xu Wang
- State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics of CAS, Xi’an 710119, China; (X.W.); (G.L.); (R.L.); (X.X.)
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Guodong Zhang
- Electronic Information College, Northwestern Polytechnical University, Xi’an 710072, China;
| | - Guangying Li
- State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics of CAS, Xi’an 710119, China; (X.W.); (G.L.); (R.L.); (X.X.)
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Rui Lou
- State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics of CAS, Xi’an 710119, China; (X.W.); (G.L.); (R.L.); (X.X.)
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zhe Sun
- Abbe Center of Photonics, Institute of Optics and Quantum Electronics, Friedrich Schiller University, Max Wien Platz 1, 07743 Jena, Germany;
| | - Xiaoping Xie
- State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics of CAS, Xi’an 710119, China; (X.W.); (G.L.); (R.L.); (X.X.)
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Weinan Li
- State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics of CAS, Xi’an 710119, China; (X.W.); (G.L.); (R.L.); (X.X.)
- Correspondence: (W.L.); (G.C.)
| | - Guanghua Cheng
- Electronic Information College, Northwestern Polytechnical University, Xi’an 710072, China;
- Correspondence: (W.L.); (G.C.)
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18
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Towards a Glass New World: The Role of Ion-Exchange in Modern Technology. APPLIED SCIENCES-BASEL 2021. [DOI: 10.3390/app11104610] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Glasses, in their different forms and compositions, have special properties that are not found in other materials. The combination of transparency and hardness at room temperature, combined with a suitable mechanical strength and excellent chemical durability, makes this material indispensable for many applications in different technological fields (as, for instance, the optical fibres which constitute the physical carrier for high-speed communication networks as well as the transducer for a wide range of high-performance sensors). For its part, ion-exchange from molten salts is a well-established, low-cost technology capable of modifying the chemical-physical properties of glass. The synergy between ion-exchange and glass has always been a happy marriage, from its ancient historical background for the realisation of wonderful artefacts, to the discovery of novel and fascinating solutions for modern technology (e.g., integrated optics). Getting inspiration from some hot topics related to the application context of this technique, the goal of this critical review is to show how ion-exchange in glass, far from being an obsolete process, can still have an important impact in everyday life, both at a merely commercial level as well as at that of frontier research.
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Gaidhani NG, Patra S, Chandwadkar HS, Sen D, Majumder C, Ramagiri SV, Bellare JR. Probing Kinetics and Mechanism of Formation of Mixed Metallic Nanoparticles in a Polymer Membrane by Galvanic Replacement between Two Immiscible Metals: Case Study of Nickel/Silver Nanoparticle Synthesis. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:1637-1650. [PMID: 33496595 DOI: 10.1021/acs.langmuir.0c02311] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Galvanic replacement between metals has received notable research interest for the synthesis of heterometallic nanostructures. The growth pattern of the nanostructures depends on several factors such as extent of lattice mismatch, adhesive interaction between the metals, cohesive forces of the individual metals, etc. Due to the difficulties in probing ultrafast kinetics of the galvanic replacement reaction and particle growth in solution, real-time mechanistic investigations are often limited. As a result, the growth mechanism of one metal on the surface of another metal at the nanoscale is poorly understood so far. In the present work, we could successfully probe the galvanic replacement of silver ions with nickel nanoparticles, stabilized in a polymer membrane, using two complementary methods, namely, small-angle X-ray scattering (SAXS) and radiolabeling, and the results are supported by density functional theory (DFT) computations. The silver-nickel system has been chosen for the present investigation because of the high degree of bulk immiscibility caused by the large lattice mismatch (15.9%) and the weak adhesive interaction, which makes it a perfect model system for immiscible metal pairs. Membrane, as a host medium, plays a crucial role in retarding the kinetics of atomic and particle rearrangements (nucleation and growth) due to slower mobility of the atoms (monomers) and particles within the polymer network. This allowed us to examine the real-time concentration of silver monomers during galvanic replacement of silver ions with nickel nanoparticles and evolution of Ni/Ag nanoparticles. From combined experiment and DFT computations, it has been demonstrated, for the first time to the best of our knowledge, that the majority of silver atoms, which are produced on the nickel nanoparticle surface by galvanic reactions, do not form traditional core-shell nanostructures with nickel and undergo a self-governing sequential nucleation and growth of silver nanoparticles via formation of intermediate prenucleation silver clusters, leading to the formation of mixed metallic nanoparticles in the membrane. The surface of NiNPs has a heterogeneous effect on the silver nucleation pathway, which is evident from the reduced critical free energy barrier of nucleation (ΔGcrit). The present work establishes an original mechanistic pathway based on a sequential nucleation model for formation of mixed metallic nanoparticles by the galvanic replacement route, which opens up future possibilities for size-controlled synthesis in mixed systems.
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Affiliation(s)
- Nikita G Gaidhani
- Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
- Department of Chemistry, Sandip University, Nashik 422213, Maharashtra, India
| | - Sabyasachi Patra
- Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
| | - Hemant S Chandwadkar
- Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
- Department of Chemistry, Sandip University, Nashik 422213, Maharashtra, India
| | - Debasis Sen
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
- Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India
| | - Chiranjib Majumder
- Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
- Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India
| | - Shobha V Ramagiri
- Department of Chemical Engineering, IIT Bombay, Powai, Mumbai 400076, India
| | - Jayesh R Bellare
- Department of Chemical Engineering, IIT Bombay, Powai, Mumbai 400076, India
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20
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Zhou R, Calahoo C, Ding Y, Yang X, Romao CP, Wondraczek L. Structural Origin of the Optical Properties of Ag-Doped Fluorophosphate and Sulfophosphate Glasses. J Phys Chem B 2021; 125:637-656. [DOI: 10.1021/acs.jpcb.0c09375] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ru Zhou
- Otto Schott Institute of Materials Research, Friedrich Schiller University Jena, Fraunhoferstraße 6, 07743 Jena, Germany
| | - Courtney Calahoo
- Otto Schott Institute of Materials Research, Friedrich Schiller University Jena, Fraunhoferstraße 6, 07743 Jena, Germany
| | - Yicong Ding
- Otto Schott Institute of Materials Research, Friedrich Schiller University Jena, Fraunhoferstraße 6, 07743 Jena, Germany
| | - Xu Yang
- Otto Schott Institute of Materials Research, Friedrich Schiller University Jena, Fraunhoferstraße 6, 07743 Jena, Germany
| | - Carl P. Romao
- Section for Solid State and Theoretical Inorganic Chemistry, Institute of Inorganic Chemistry, University of Tübingen, Auf der Morgenstelle 18, D-72076 Tübingen, Germany
| | - Lothar Wondraczek
- Otto Schott Institute of Materials Research, Friedrich Schiller University Jena, Fraunhoferstraße 6, 07743 Jena, Germany
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21
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Liu KG, Gao XM, Liu T, Hu ML, Jiang DE. All-Carboxylate-Protected Superatomic Silver Nanocluster with an Unprecedented Rhombohedral Ag 8 Core. J Am Chem Soc 2020; 142:16905-16909. [PMID: 32941019 DOI: 10.1021/jacs.0c06682] [Citation(s) in RCA: 57] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
We report the synthesis and structure of the first all-carboxylate-protected superatomic silver nanocluster. It was prepared by heating a dimethylformamide solution of perfluoroglutaric acid and AgNO3 under alkaline conditions, yielding a single crystal of [(CH3)2NH2]6[Ag8(pfga)6]. The [Ag8(pfga)6]6- cluster has a rhombohedral Ag86+ core, with each of its faces protected by one dianionic perfluoroglutarate (pfga) ligand. Electronic-structure analysis from density functional theory confirms the stability of this two-electron cluster due to the shell closing of the superatomic orbital in the (1S)2 configuration and explains the optical absorption of the cluster in the visible region as the transition from 1S to 1P orbital. The [Ag8(pfga)6]6- cluster emits bright green-yellow light in THF solution and bright orange light in the solid state. This work opens the door to using the widely available carboxylic acids to synthesize atomically precise Ag clusters of attractive properties.
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Affiliation(s)
- Kuan-Guan Liu
- State Key Laboratory of High-efficiency Coal Utilization and Green Chemical Engineering and Ningxia Key Laboratory for Photovoltaic Materials, Ningxia University, Yinchuan, Ningxia 750021, China
| | - Xue-Mei Gao
- State Key Laboratory of High-efficiency Coal Utilization and Green Chemical Engineering and Ningxia Key Laboratory for Photovoltaic Materials, Ningxia University, Yinchuan, Ningxia 750021, China
| | - Tongyu Liu
- Department of Chemistry, University of California, Riverside, California 92521, United States
| | - Mao-Lin Hu
- College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, Zhejiang 325035, China
| | - De-En Jiang
- Department of Chemistry, University of California, Riverside, California 92521, United States
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22
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Cha JH, Yang SY, Oh J, Choi S, Park S, Jang BC, Ahn W, Choi SY. Conductive-bridging random-access memories for emerging neuromorphic computing. NANOSCALE 2020; 12:14339-14368. [PMID: 32373884 DOI: 10.1039/d0nr01671c] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
With the increasing utilisation of artificial intelligence, there is a renewed demand for the development of novel neuromorphic computing owing to the drawbacks of the existing computing paradigm based on the von Neumann architecture. Extensive studies have been performed on memristors as their electrical nature is similar to those of biological synapses and neurons. However, most hardware-based artificial neural networks (ANNs) have been developed with oxide-based memristors owing to their high compatibility with mature complementary metal-oxide-semiconductor (CMOS) processes. Considering the advantages of conductive-bridging random-access memories (CBRAMs), such as their high scalability, high on-off current with a wide dynamic range, and low off-current, over oxide-based memristors, extensive studies on CBRAMs are required. In this review, the basics of operation of CBRAMs are examined in detail, from the formation of metal nanoclusters to filament bridging. Additionally, state-of-the-art experimental demonstrations of CBRAM-based artificial synapses and neurons are presented. Finally, CBRAM-based ANNs are discussed, including deep neural networks and spiking neural networks, along with other emerging computing applications. This review is expected to pave the way toward further development of large-scale CBRAM array systems.
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Affiliation(s)
- Jun-Hwe Cha
- School of Electrical Engineering, Graphene/2D Materials Research Center, Center for Advanced Materials Discovery towards 3D Displays, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea.
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23
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Lu S, Hu K, Zuo Z, Hu S, Wang G, Song F, Cao L. Beam generation and structural optimization of size-selected Au 923 clusters. NANOSCALE ADVANCES 2020; 2:2720-2725. [PMID: 36132384 PMCID: PMC9418728 DOI: 10.1039/d0na00304b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Accepted: 05/18/2020] [Indexed: 06/15/2023]
Abstract
A size-selected beam of Au923±20 clusters is generated in a gas-phase condensation cluster source equipped with a lateral time-of-flight mass selector. The beam current reaches up to 9.13 nA for small clusters and 80 pA for Au923±20 clusters, which are then analyzed using a scanning transmission electron microscope. Four types of metastable structures are observed for the Au923±20 clusters, including ino-decahedron (Dh), cuboctahedron and icosahedron (Ih). The proportion of bulk-favorable cuboctahedron (i.e. face center cubic (Fcc)) structure takes up only 10-20%, while the penta-rotating symmetrical structures (Dh/Ih) are the dominant ones which take up over three quarters. Changing the beam condition may optimize the clusters from Dh-dominant to the Ih-dominant phase, which paves the way towards nanoparticle control beyond the diameters.
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Affiliation(s)
- Siqi Lu
- National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, School of Physics, Nanjing University Nanjing 210093 China
- Atomic Manufacture Institute (AMI) 211805 Nanjing China
| | - Kuojuei Hu
- National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, School of Physics, Nanjing University Nanjing 210093 China
- Atomic Manufacture Institute (AMI) 211805 Nanjing China
| | - Zewen Zuo
- National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, School of Physics, Nanjing University Nanjing 210093 China
- Atomic Manufacture Institute (AMI) 211805 Nanjing China
| | - Shengyong Hu
- National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, School of Physics, Nanjing University Nanjing 210093 China
- Atomic Manufacture Institute (AMI) 211805 Nanjing China
| | - Guanghou Wang
- National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, School of Physics, Nanjing University Nanjing 210093 China
- Atomic Manufacture Institute (AMI) 211805 Nanjing China
| | - Fengqi Song
- National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, School of Physics, Nanjing University Nanjing 210093 China
- Atomic Manufacture Institute (AMI) 211805 Nanjing China
| | - Lu Cao
- National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, School of Physics, Nanjing University Nanjing 210093 China
- Atomic Manufacture Institute (AMI) 211805 Nanjing China
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24
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McKeever SW, Sholom S, Shrestha N, Klein DM. Build-up of radiophotoluminescence (RPL) in Ag-doped phosphate glass in real-time both during and after exposure to ionizing radiation: A proposed model. RADIAT MEAS 2020. [DOI: 10.1016/j.radmeas.2020.106246] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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25
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Yang TQ, Peng B, Shan BQ, Zong YX, Jiang JG, Wu P, Zhang K. Origin of the Photoluminescence of Metal Nanoclusters: From Metal-Centered Emission to Ligand-Centered Emission. NANOMATERIALS 2020; 10:nano10020261. [PMID: 32033058 PMCID: PMC7075164 DOI: 10.3390/nano10020261] [Citation(s) in RCA: 83] [Impact Index Per Article: 20.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/23/2019] [Revised: 01/26/2020] [Accepted: 01/29/2020] [Indexed: 12/17/2022]
Abstract
Recently, metal nanoclusters (MNCs) emerged as a new class of luminescent materials and have attracted tremendous interest in the area of luminescence-related applications due to their excellent luminous properties (good photostability, large Stokes shift) and inherent good biocompatibility. However, the origin of photoluminescence (PL) of MNCs is still not fully understood, which has limited their practical application. In this mini-review, focusing on the origin of the photoemission emission of MNCs, we simply review the evolution of luminescent mechanism models of MNCs, from the pure metal-centered quantum confinement mechanics to ligand-centered p band intermediate state (PBIS) model via a transitional ligand-to-metal charge transfer (LMCT or LMMCT) mechanism as a compromise model.
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Affiliation(s)
| | | | | | | | | | - Peng Wu
- Correspondence: (P.W.); (K.Z.)
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26
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Fractal evolution of dual pH- and temperature-responsive P(NIPAM-co-AA)@BMMs with bimodal mesoporous silica core and coated-copolymer shell during drug delivery procedure via SAXS characterization. ARAB J CHEM 2020. [DOI: 10.1016/j.arabjc.2019.06.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
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27
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Kalwarczyk E, Kabaciński P, Kardaś TM, Górecka E, Bilski H, Fiałkowski M. A Seedless Method for Gold Nanoparticle Growth inside a Silica Matrix: Fabrication of Materials Capable of Third-Harmonic Generation in the Near-Infrared. Chempluschem 2020; 84:525-533. [PMID: 31943903 DOI: 10.1002/cplu.201900224] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Revised: 05/04/2019] [Indexed: 11/11/2022]
Abstract
A composite in which gold nanoparticles (AuNPs) approximately 10 nm in size are embedded in amorphous transparent silica matrix has been produced. The synthetic protocol uses HAuCl4 as the Au ion source, tetraethoxysilane (TEOS) as the SiO2 precursor, and l-ascorbic acid (AA) as the reducing agent. AA is employed before the sol-gel process in an amount sufficient only for reduction of Au3+ ions to Au+ . By using a cationic surfactant, benzylcetyldimethylammonium chloride hydrate (BDAC) and/or cetyltrimethylammonium bromide (CTAB), the Au+ ions are encapsulated within metalomicelles, which prevents them from being reduced to Au0 and enables their homogeneous distribution in the gel. Reduction of Au+ to Au0 and the growth of the AuNPs occurs at room temperature during the gelation, and arises from the release of EtOH during the hydrolysis of TEOS. The composites contain 0.027 wt % of Au. They exhibit nonlinear optical behavior characterized by the third-order nonlinear refraction index, n2 , in the range 3.6-5.7×10-16 cm2 W-1 at λ=1.030 μm. The composites are capable of effective third-harmonic generation of ultrashort near-IR (210 fs, 1.030 μm) laser pulse through a direct third-order mechanism.
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Affiliation(s)
- Ewelina Kalwarczyk
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-006, Warsaw, Poland
| | - Piotr Kabaciński
- Faculty of Physics, Warsaw University of Technology, Koszykowa 75, 00-622, Warsaw, Poland
| | - Tomasz M Kardaś
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-006, Warsaw, Poland
| | - Ewa Górecka
- Faculty of Chemistry, University of Warsaw, Al. Zwirki i Wigury 101, 02-089, Warsaw, Poland
| | - Henryk Bilski
- Laboratory of Electron Microscopy Nencki Institute of Experimental Biology, Polish Academy of Sciences, Pasteura 3, 02-093, Warsaw, Poland
| | - Marcin Fiałkowski
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-006, Warsaw, Poland
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Ren K, Xu X, Yao Z, Chen X, Hu T, Li P, Fan X, Du J, Qiao X, Qian G. Temperature dependent molecular fluorescence of [Ag m] n+ quantum clusters stabilized by phosphate glass networks. Phys Chem Chem Phys 2020; 22:21307-21316. [PMID: 32935686 DOI: 10.1039/d0cp03828h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Molecule like silver quantum clusters ([Agm]n+ QCs) exhibit an ultrasmall size confinement resulting in efficient broadband fluorescence. However, free [Agm]n+ QCs are also chemically active, so their stabilization is required for practical applications. We report in this work a phosphate oxyfluoride glass network enabled stabilization strategy of [Agm]n+ QCs. A series of silver-doped P2O5-ZnF2-xAg glasses were prepared by a conventional melt-and-quench method. The NMR and XPS results reveal that two types of [P(O,F)4] tetrahedrons (Q1, Q2) form chain structures and Zn(iv) connects [P(O,F)4] chains into a 3-dimension network in the glasses. The frameworks with limited void spaces were designed to restrict the polymerization degree, m, of [Agm]n+ QCs; the negatively charged tetrahedrons were designed to restrict the charge, n, of [Agm]n+ QCs. Through optical and mass spectroscopy studies, silver quantum clusters, [Ag2]2+ and [Ag4]2+, were identified to be charge compensated by [ZnO4] tetrahedrons and surrounded with [P(O,F)4] complex anions. The fluorescence thus gives high quantum efficiencies of 55.2% and 83.4%, for P2O5-ZnF2-xAg glass stabilized [Ag2]2+ and [Ag4]2+ QCs, respectively. This further reveals that the peak fixed fluorescence of [Ag2]2+ and [Ag4]2+ can be described by molecular fluorescence mechanisms. These are parity-allowed singlet-singlet transitions (S1 → S0), parity-forbidden triplet-singlet transitions (T1 → S0) and intersystem crossings between singlets (S1) and triplets (T1). The phonon coupled intersystem crossing between singlets (S1) and triplets (T1) determines the phosphate stabilized [Ag4]2+ QCs to exhibit a series of temperature dependent fluorescence behaviors. These include fluorescence intensity (at 50-200 K), intensity ratio (FIR) (at 50-200 K), peak shift (at 100-300 K) and lifetime (at 300-450 K) with maximum sensitivities of 1.27% K-1, 0.94% K-1, 0.29% K-1 and 0.41% K-1, respectively. Therefore, phosphate stabilized [Ag4]2+ QCs can be applied as temperature sensing probes, especially at low temperatures (10-300 K) and for color-based visualized temperature sensors.
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Affiliation(s)
- Kai Ren
- State Key Laboratory of Silicon Materials & School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China.
| | - Xiuxia Xu
- State Key Laboratory of Silicon Materials & School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China.
| | - Zeyu Yao
- State Key Laboratory of Silicon Materials & School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China.
| | - Xiaotong Chen
- State Key Laboratory of Silicon Materials & School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China.
| | - Tian Hu
- State Key Laboratory of Silicon Materials & School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China.
| | - Pengcheng Li
- State Key Laboratory of Silicon Materials & School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China.
| | - Xianping Fan
- State Key Laboratory of Silicon Materials & School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China.
| | - Jincheng Du
- Department of Materials Science and Engineering, University of North Texas, Denton, Texas 76203-5017, USA
| | - Xvsheng Qiao
- State Key Laboratory of Silicon Materials & School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China.
| | - Guodong Qian
- State Key Laboratory of Silicon Materials & School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China.
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29
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Thieme C, Thieme K, Höche T. Tunable pore size in diopside glass-ceramics with silver nanoparticles. CrystEngComm 2020. [DOI: 10.1039/d0ce00019a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Volume crystallization was achieved in diopside glasses by the introduction of silver into the glassy network.
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Affiliation(s)
- Christian Thieme
- Fraunhofer-Institut für Mikrostruktur von Werkstoffen und Systemen IMWS
- 06120 Halle (Saale)
- Germany
| | - Katrin Thieme
- Fraunhofer-Institut für Mikrostruktur von Werkstoffen und Systemen IMWS
- 06120 Halle (Saale)
- Germany
| | - Thomas Höche
- Fraunhofer-Institut für Mikrostruktur von Werkstoffen und Systemen IMWS
- 06120 Halle (Saale)
- Germany
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30
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McNally MJ, Galinis G, Youle O, Petr M, Prucek R, Machala L, von Haeften K. Silver nanoparticles by atomic vapour deposition on an alcohol micro-jet. NANOSCALE ADVANCES 2019; 1:4041-4051. [PMID: 36132097 PMCID: PMC9418456 DOI: 10.1039/c9na00347a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2019] [Accepted: 09/05/2019] [Indexed: 05/13/2023]
Abstract
We achieved sputter deposition of silver atoms onto liquid alcohols by injection of solvents into vacuum via a liquid microjet. Mixing silver atoms into ethanol by this method produced metallic silver nanoparticles. These had a broad, log-normal size distribution, with median size between 3.3 ± 1.4 nm and 2.0 ± 0.7 nm, depending on experiment geometry; and a broad plasmon absorption band centred around 450 nm. We also deposited silver atoms into a solution of colloidal silica nanoparticles, generating silver-decorated silica particles with consistent decoration of almost one silver particle to each silica sphere. The silver-silica mixture showed increased colloidal stability and yield of silver, along with a narrowed size distribution and a narrower plasmon band blue-shifted to 410 nm. Significant methanol loss of 1.65 × 10-7 mol MeOH per g per s from the mature silver-silica solutions suggests we have reproduced known silica supported silver catalysts. The excellent distribution of silver on each silica sphere shows this technique has potential to improve the distribution of catalytically active particles in supported catalysts.
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Affiliation(s)
- Michael J McNally
- Department of Physics and Astronomy, University of Leicester Leicester UK
| | - Gediminas Galinis
- Department of Physics and Astronomy, University of Leicester Leicester UK
| | - Oliver Youle
- Department of Physics and Astronomy, University of Leicester Leicester UK
- Department of Engineering, University of Leicester Leicester UK
| | - Martin Petr
- Regional Centre of Advanced Technologies and Materials (RCPTM), Faculty of Science, Palacký University Olomouc Olomouc Czech Republic
| | - Robert Prucek
- Regional Centre of Advanced Technologies and Materials (RCPTM), Faculty of Science, Palacký University Olomouc Olomouc Czech Republic
| | - Libor Machala
- Regional Centre of Advanced Technologies and Materials (RCPTM), Faculty of Science, Palacký University Olomouc Olomouc Czech Republic
| | - Klaus von Haeften
- Department of Physics and Astronomy, University of Leicester Leicester UK
- Kanano GmbH 89077 Ulm Germany
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31
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Poling-Skutvik R, Roberts RC, Slim AH, Narayanan S, Krishnamoorti R, Palmer JC, Conrad JC. Structure Dominates Localization of Tracers within Aging Nanoparticle Glasses. J Phys Chem Lett 2019; 10:1784-1789. [PMID: 30916569 DOI: 10.1021/acs.jpclett.9b00309] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
We investigate the transport and localization of tracer probes in a glassy matrix as a function of relative size using dynamic X-ray scattering experiments and molecular dynamics simulations. The quiescent relaxations of tracer particles evolve with increasing waiting time, tw. The corresponding relaxation times increase exponentially at small tw and then transition to a power-law behavior at longer tw. As tracer size decreases, the aging behavior weakens and the particles become less localized within the matrix until they delocalize at a critical size ratio δ0 ≈ 0.38. Localization does not vary with sample age even as the relaxations slow by approximately an order of magnitude, suggesting that matrix structure controls tracer localization.
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Affiliation(s)
- Ryan Poling-Skutvik
- Department of Chemical and Biomolecular Engineering , University of Houston , Houston , Texas 77204-4004 , United States
| | - Ryan C Roberts
- Department of Chemical and Biomolecular Engineering , University of Houston , Houston , Texas 77204-4004 , United States
| | - Ali H Slim
- Department of Chemical and Biomolecular Engineering , University of Houston , Houston , Texas 77204-4004 , United States
| | - Suresh Narayanan
- Advanced Photon Source , Argonne National Laboratory , Argonne , Illinois 60439 , United States
| | - Ramanan Krishnamoorti
- Department of Chemical and Biomolecular Engineering , University of Houston , Houston , Texas 77204-4004 , United States
| | - Jeremy C Palmer
- Department of Chemical and Biomolecular Engineering , University of Houston , Houston , Texas 77204-4004 , United States
| | - Jacinta C Conrad
- Department of Chemical and Biomolecular Engineering , University of Houston , Houston , Texas 77204-4004 , United States
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32
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Observations regarding the build-up effect in radiophotoluminescence of silver-doped phosphate glasses. RADIAT MEAS 2019. [DOI: 10.1016/j.radmeas.2019.02.009] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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33
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Wang W, Wang M, Ambrosi E, Bricalli A, Laudato M, Sun Z, Chen X, Ielmini D. Surface diffusion-limited lifetime of silver and copper nanofilaments in resistive switching devices. Nat Commun 2019; 10:81. [PMID: 30622251 PMCID: PMC6325242 DOI: 10.1038/s41467-018-07979-0] [Citation(s) in RCA: 77] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2018] [Accepted: 12/02/2018] [Indexed: 11/23/2022] Open
Abstract
Silver/copper-filament-based resistive switching memory relies on the formation and disruption of a metallic conductive filament (CF) with relatively large surface-to-volume ratio. The nanoscale CF can spontaneously break after formation, with a lifetime ranging from few microseconds to several months, or even years. Controlling and predicting the CF lifetime enables device engineering for a wide range of applications, such as non-volatile memory for data storage, tunable short/long term memory for synaptic neuromorphic computing, and fast selection devices for crosspoint arrays. However, conflictive explanations for the CF retention process are being proposed. Here we show that the CF lifetime can be described by a universal surface-limited self-diffusion mechanism of disruption of the metallic CF. The surface diffusion process provides a new perspective of ion transport mechanism at the nanoscale, explaining the broad range of reported lifetimes, and paving the way for material engineering of resistive switching device for memory and computing applications. Resistive random-access memory is operated based on the formation and disruption of nanoscale conductive filaments, but a mechanistic understanding of this process remains unclear. Here, Wang et al. develop a surface-diffusion model to describe lifetime of filaments ranging from microseconds to years.
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Affiliation(s)
- Wei Wang
- Dipartimento di Elettronica, Informazione e Bioingegneria, Politecnico di Milano and IUNET, Piazza L. da Vinci, 32-20133, Milano, Italy
| | - Ming Wang
- Innovative Centre for Flexible Devices (iFLEX), School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
| | - Elia Ambrosi
- Dipartimento di Elettronica, Informazione e Bioingegneria, Politecnico di Milano and IUNET, Piazza L. da Vinci, 32-20133, Milano, Italy
| | - Alessandro Bricalli
- Dipartimento di Elettronica, Informazione e Bioingegneria, Politecnico di Milano and IUNET, Piazza L. da Vinci, 32-20133, Milano, Italy
| | - Mario Laudato
- Dipartimento di Elettronica, Informazione e Bioingegneria, Politecnico di Milano and IUNET, Piazza L. da Vinci, 32-20133, Milano, Italy
| | - Zhong Sun
- Dipartimento di Elettronica, Informazione e Bioingegneria, Politecnico di Milano and IUNET, Piazza L. da Vinci, 32-20133, Milano, Italy
| | - Xiaodong Chen
- Innovative Centre for Flexible Devices (iFLEX), School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.
| | - Daniele Ielmini
- Dipartimento di Elettronica, Informazione e Bioingegneria, Politecnico di Milano and IUNET, Piazza L. da Vinci, 32-20133, Milano, Italy.
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34
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Thieme C, Kracker M, Thieme K, Patzig C, Höche T, Rüssel C. Core–shell structures with metallic silver as nucleation agent of low expansion phases in BaO/SrO/ZnO/SiO 2 glasses. CrystEngComm 2019. [DOI: 10.1039/c9ce00693a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The role of silver as a nucleating agent in BaO/SrO/ZnO/SiO2 glasses is studied with a range of microstructure-characterization techniques, such as scanning transmission electron microscopy, ultraviolet-visible spectroscopy, and X-ray diffraction.
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Affiliation(s)
- Christian Thieme
- Fraunhofer-Institut für Mikrostruktur von Werkstoffen und Systemen IMWS
- 06120 Halle (Saale)
- Germany
| | - Michael Kracker
- Otto-Schott-Institut für Materialforschung
- Jena University
- 07743 Jena
- Germany
| | - Katrin Thieme
- Fraunhofer-Institut für Mikrostruktur von Werkstoffen und Systemen IMWS
- 06120 Halle (Saale)
- Germany
- Otto-Schott-Institut für Materialforschung
- Jena University
| | - Christian Patzig
- Fraunhofer-Institut für Mikrostruktur von Werkstoffen und Systemen IMWS
- 06120 Halle (Saale)
- Germany
| | - Thomas Höche
- Fraunhofer-Institut für Mikrostruktur von Werkstoffen und Systemen IMWS
- 06120 Halle (Saale)
- Germany
| | - Christian Rüssel
- Otto-Schott-Institut für Materialforschung
- Jena University
- 07743 Jena
- Germany
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35
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Grandjean D, Coutiño-Gonzalez E, Cuong NT, Fron E, Baekelant W, Aghakhani S, Schlexer P, D’Acapito F, Banerjee D, Roeffaers MBJ, Nguyen MT, Hofkens J, Lievens P. Origin of the bright photoluminescence of few-atom silver clusters confined in LTA zeolites. Science 2018; 361:686-690. [DOI: 10.1126/science.aaq1308] [Citation(s) in RCA: 94] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2017] [Accepted: 06/15/2018] [Indexed: 11/02/2022]
Abstract
Silver (Ag) clusters confined in matrices possess remarkable luminescence properties, but little is known about their structural and electronic properties. We characterized the bright green luminescence of Ag clusters confined in partially exchanged Ag–Linde Type A (LTA) zeolites by means of a combination of x-ray excited optical luminescence-extended x-ray absorption fine structure, time-dependent–density functional theory calculations, and time-resolved spectroscopy. A mixture of tetrahedral Ag4(H2O)x2+(x= 2 andx= 4) clusters occupies the center of a fraction of the sodalite cages. Their optical properties originate from a confined two-electron superatom quantum system with hybridized Ag and water O orbitals delocalized over the cluster. Upon excitation, one electron of the s-type highest occupied molecular orbital is promoted to the p-type lowest unoccupied molecular orbitals and relaxes through enhanced intersystem crossing into long-lived triplet states.
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36
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Silver oxide decomposition mediated direct bonding of silicon-based materials. Sci Rep 2018; 8:10472. [PMID: 29993004 PMCID: PMC6041264 DOI: 10.1038/s41598-018-28788-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2018] [Accepted: 06/29/2018] [Indexed: 11/29/2022] Open
Abstract
Silicon-based materials are widely promising electronic components by the combination with metals in power electronics field. However, bonding metal and silicon-based materials generally requires specific surface modification due to their different chemical bonds. Here, we demonstrate a process for directly bonding metals to silicon-based materials that does not require surface treatment, based on the in situ decomposition of Ag2O paste, forming Ag nanoparticles (AgNPs). We demonstrate sound joints of Ag/silicon-based materials at 300–500 °C with the formation of a silicon oxide interlayer containing AgNPs. We propose that Ag in the interlayer attracted other Ag particles to the interface, playing a unique role in this direct bonding process. This process is suitable for various bonding applications in electronics, as well the fabrication of conducting paths for photovoltaic and other applications.
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37
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Zmojda J, Kochanowicz M, Miluski P, Baranowska A, Basa A, Jadach R, Sitarz M, Dorosz D. The influence of Ag content and annealing time on structural and optical properties of SGS antimony-germanate glass doped with Er3+ ions. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2018.02.030] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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38
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Wang M, Hao P, Shen J, Fu Y. Structure-Dependent Photochromic Iodoargentate Hybrids Based on Photolytic Mechanism. ChemistrySelect 2018. [DOI: 10.1002/slct.201800966] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Meidan Wang
- Key Laboratory of Magnetic Molecules; Magnetic Information Materials Ministry of Education; School of Chemical and Material Science; Shanxi Normal University; Linfen 041004 China
| | - Pengfei Hao
- Key Laboratory of Magnetic Molecules; Magnetic Information Materials Ministry of Education; School of Chemical and Material Science; Shanxi Normal University; Linfen 041004 China
| | - Junju Shen
- Key Laboratory of Magnetic Molecules; Magnetic Information Materials Ministry of Education; School of Chemical and Material Science; Shanxi Normal University; Linfen 041004 China
| | - Yunlong Fu
- Key Laboratory of Magnetic Molecules; Magnetic Information Materials Ministry of Education; School of Chemical and Material Science; Shanxi Normal University; Linfen 041004 China
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39
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Sandrini M, Muniz RF, Zanuto VS, Pedrochi F, Guyot Y, Bento AC, Baesso ML, Steimacher A, Neto AM. Enhanced and tunable white light emission from Ag nanoclusters and Eu3+-co-doped CaBAl glasses. RSC Adv 2018; 8:35263-35270. [PMID: 35547081 PMCID: PMC9087325 DOI: 10.1039/c8ra07114d] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2018] [Accepted: 09/24/2018] [Indexed: 11/25/2022] Open
Abstract
Noble metal embedded glasses have been studied as promising candidates for a variety of technological applications, mainly due to their ability to enhance rare earth luminescence properties. In this work, Ag:Eu-co-doped calcium boroaluminate glasses were prepared and submitted to further heat treatment to form different Ag species. The optical and luminescence properties were investigated in terms of heat treatment times. Absorption spectra showed a successful Eu and Ag ion incorporation in the host, as well as Ag nanoparticle precipitation induced by heat treatment. Upon UV-light excitation, the co-doped glasses exhibited an intense wide emission band centered at about 500 nm, attributed to molecule-like silver species, which combined with the Eu3+ characteristic emission reaches a white light resultant emission. A new excitation band for Eu3+ at 335 nm and a silver luminescence lifetime decrease suggest an energy transfer process from molecule-like Ag to Eu3+ as being responsible for the enhanced PL properties in these glasses. An appropriate combination of a violet LED with the sample emission provides a route to achieve the ideal white light CIE color parameters. The relevant quality color results qualify these glasses as phosphors with high potential for white light emitting devices. In this work, Ag:Eu-co-doped calcium boroaluminate glasses were prepared and submitted to further heat treatment to form different Ag species. The optical and luminescence properties were investigated in terms of heat treatment times.![]()
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Affiliation(s)
- Marcelo Sandrini
- Departamento de Física
- Universidade Estadual de Maringá
- Maringá
- Brazil
| | | | | | | | - Yannick Guyot
- Institut Lumière Matière
- Université de Lyon
- UMR5306 Université Lyon 1 - CNRS
- France
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40
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Loskutov AI, Lokshin BV, Gudasheva TA, Oshurko VB, Solis Pinargote N, Sazonova NM, Romanov VA. Role of the interfaces and the charge of a molecule in the non-equilibrium crystallization of dipeptide nanomaterials onto solid substrates. CrystEngComm 2018. [DOI: 10.1039/c8ce01468j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A critical role of the net charge of molecule and nature of interfaces on the structure and properties of crystallized dipeptide layers was established.
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Affiliation(s)
| | - Boris V. Lokshin
- A.N. Nesmeyanov Institute of Organoelement Compounds
- Russian Academy of Sciences
- Moscow
- 119991 Russia
| | - Tatiana A. Gudasheva
- V. V. Zakusov Scientific Research Institute of Pharmacology
- Russian Academy of Medical Sciences
- Moscow
- 125315 Russia
| | - Vadim B. Oshurko
- Moscow State Technological University STANKIN
- Moscow
- 127994 Russia
| | | | - Nellya M. Sazonova
- V. V. Zakusov Scientific Research Institute of Pharmacology
- Russian Academy of Medical Sciences
- Moscow
- 125315 Russia
| | - Vadim A. Romanov
- Moscow State Technological University STANKIN
- Moscow
- 127994 Russia
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41
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Abbass AE, Janse Van Vuuren A, Swart H, Kroon R. Distinguishing the nature of silver incorporated in sol-gel silica. JOURNAL OF NON-CRYSTALLINE SOLIDS 2017; 475:71-75. [DOI: 10.1016/j.jnoncrysol.2017.08.033] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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42
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Inwati G, Rao Y, Singh M. In Situ Growth of Low-Dimensional Silver Nanoclusters with Their Tunable Plasmonic and Thermodynamic Behavior. ACS OMEGA 2017; 2:5748-5758. [PMID: 31457833 PMCID: PMC6644898 DOI: 10.1021/acsomega.7b00672] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/25/2017] [Accepted: 07/24/2017] [Indexed: 06/10/2023]
Abstract
Optical properties of noble metal nanostructures associated with localized surface plasmon resonance (SPR) are technically important for optical switches and plasmonic devices. In this work, silver nanoclusters are embedded inside the soda-lime glass matrix, followed by a thermal annealing process in an open air atmosphere for 1 h. The effects of thermal annealing on the plasmonic behavior of Ag nanoclusters embedded in the glass matrix are studied with UV-vis spectroscopy and photoluminescence. In the SPR spectra, a 14 nm blue shift is observed in the visible range under the influence of thermal annealing at a higher temperature. The thermal effects on Ag particle size and SPR have been illustrated for plasmonic properties. The structural and elemental investigation of as-grown Ag nanoclusters is confirmed by X-ray diffraction, high-resolution transmission electron microscope, and X-ray photoelectron spectroscopy. The structural, plasmonic, and thermodynamic properties associated with the growth mechanism of Ag nanoclusters have been explained under the thermal process. Enthalpy (ΔH), entropy (ΔS), and Gibbs energy (ΔG) for Ag nanoclusters growth and nucleation are significantly calculated and interpreted at different temperatures. An empirical relation among the ΔH, ΔS, and ΔG is developed vis-a-vis activation energy (97.70 J/mol), which is calculated by the Arrhenius linear equation.
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Affiliation(s)
- Gajendra
Kumar Inwati
- Centre
for Nanosciences and School of Chemical Sciences, Central University
of Gujarat, Sector-30, Gandhinagar 382030, India
| | - Yashvant Rao
- Centre
for Nanosciences and School of Chemical Sciences, Central University
of Gujarat, Sector-30, Gandhinagar 382030, India
| | - Man Singh
- Centre
for Nanosciences and School of Chemical Sciences, Central University
of Gujarat, Sector-30, Gandhinagar 382030, India
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43
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Huang Y, Li L, Zhang Y, Zhang L, Ge S, Li H, Yu J. Cerium Dioxide-Mediated Signal "On-Off" by Resonance Energy Transfer on a Lab-On-Paper Device for Ultrasensitive Detection of Lead Ions. ACS APPLIED MATERIALS & INTERFACES 2017; 9:32591-32598. [PMID: 28870075 DOI: 10.1021/acsami.7b10629] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In this report, a 3D microfluidic lab-on-paper device for ultrasensitive detection of lead cation was designed using phoenix tree fruit-shaped CeO2 nanoparticles (PFCeO2 NPs) as the catalyst and 50 nm silver NPs (Ag NPs) as the quencher. First, snowflake-like Ag NPs were grown on the paper working electrode through an in situ growth method and used as a matrix for DNAzymes that were specific for lead ions (Pb2+). After the addition of Ag NP-labeled substrate strands, the Ag NPs restrained the electrochemiluminescence (ECL) intensity of luminol greatly through the resonance energy transfer from luminol to Ag NPs. However, under the existence of Pb2+, the substrate strands were separated, and then PFCeO2 NP-labeled signal strands were hybridized with the DNAzymes. The ECL signal was improved greatly under the fast catalytic reaction between PFCeO2 NPs and H2O2, which converted the response from signal off to signal on state, resulting in sensitive detection of Pb2+. Under the optimal conditions, the ECL signal response exhibited a good linear relationship with the logarithm of lead cation in a wide linear range of 0.05-2000 nM and an ultralow detection limit of 0.016 nM. Meanwhile, a sensor featured with good specificity, acceptable stability, reproducibility, and low cost provides a promising portable, simple, and effective strategy for Pb2+ detection.
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Affiliation(s)
- Yuzhen Huang
- Institute for Advanced Interdisciplinary Research, ‡Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, and §School of Chemistry and Chemical Engineering, University of Jinan , Jinan 250022, P. R. China
| | - Li Li
- Institute for Advanced Interdisciplinary Research, ‡Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, and §School of Chemistry and Chemical Engineering, University of Jinan , Jinan 250022, P. R. China
| | - Yan Zhang
- Institute for Advanced Interdisciplinary Research, ‡Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, and §School of Chemistry and Chemical Engineering, University of Jinan , Jinan 250022, P. R. China
| | - Lina Zhang
- Institute for Advanced Interdisciplinary Research, ‡Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, and §School of Chemistry and Chemical Engineering, University of Jinan , Jinan 250022, P. R. China
| | - Shenguang Ge
- Institute for Advanced Interdisciplinary Research, ‡Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, and §School of Chemistry and Chemical Engineering, University of Jinan , Jinan 250022, P. R. China
| | - Hao Li
- Institute for Advanced Interdisciplinary Research, ‡Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, and §School of Chemistry and Chemical Engineering, University of Jinan , Jinan 250022, P. R. China
| | - Jinghua Yu
- Institute for Advanced Interdisciplinary Research, ‡Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, and §School of Chemistry and Chemical Engineering, University of Jinan , Jinan 250022, P. R. China
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Klyukin D, Silvennoinen M, Krykova V, Svirko Y, Sidorov A, Nikonorov N. Fluorescent clusters in chloride photo-thermo-refractive glass by femtosecond laser bleaching of Ag nanoparticles. OPTICS EXPRESS 2017; 25:12944-12951. [PMID: 28786646 DOI: 10.1364/oe.25.012944] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2017] [Accepted: 04/30/2017] [Indexed: 06/07/2023]
Abstract
We report photoluminescence in bulk chloride photo-thermo-refractive glass under irradiation with femtosecond laser pulses. The fluorescence originates from the bleaching of silver nanoparticles precipitating in the glass. Similarly to the conventional process of the femtosecond re-shaping of metal inclusions with diameter tens of nanometers, irradiation of the smaller nanoparticles results in a fast shrinking size with an ellipsoidal shape via photofragmentation. Under UV excitation, remaining sub-nanometer silver molecular clusters show visible and near IR fluorescence, which increases with chlorine concentration. The observed bleaching of silver nanoparticles in bulk glass-metal nanocomposite can find applications in data storage and bleaching of volume Bragg gratings.
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Das Gupta T, Maurin I, Rowe ACH, Gacoin T. Ultrafine tuning of the metal volume fraction in silver/silicate nanocomposites near the percolation threshold. NANOSCALE 2017; 9:3504-3511. [PMID: 28240332 DOI: 10.1039/c6nr08918f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Metal dielectric nanocomposites exhibit a broad range of physical properties that can be tuned by varying the metallic volume fraction (ϕ), in particular near the percolation threshold. The study and exploitation of the so-called critical properties at this threshold are currently limited by the inability to finely tune ϕ in a continuous way, for example in physical mixtures. Here we present a novel chemical fabrication process for metal dielectric coatings consisting of TiO2 nanoparticles dispersed in a mesoporous silver silicate host matrix. UV light irradiation of these active films allows for the photocatalytic formation of silver nanoparticles with a dose dependent, measured incremental variation in ϕ as small as 0.01% up to a total volume fraction of 20% (i.e. exceeding the 3D percolation threshold). Moreover, this is achieved in situ, that is to say, while measuring the optical or electrical properties of the nanocomposite. Simple examples of hysteretic resistance measurements and optical absorption/reflection as a function of ϕ are presented, demonstrating the utility of this nanocomposite system for the study of percolation phenomena as well as its potential for applications such as sensitive strain sensors.
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Affiliation(s)
- T Das Gupta
- Laboratoire de Physique de la Matière Condense, Ecole Polytechnique, CNRS, Université Paris Saclay, Route de Saclay, 91128 Palaiseau cedex, France.
| | - I Maurin
- Laboratoire de Physique de la Matière Condense, Ecole Polytechnique, CNRS, Université Paris Saclay, Route de Saclay, 91128 Palaiseau cedex, France.
| | - A C H Rowe
- Laboratoire de Physique de la Matière Condense, Ecole Polytechnique, CNRS, Université Paris Saclay, Route de Saclay, 91128 Palaiseau cedex, France.
| | - T Gacoin
- Laboratoire de Physique de la Matière Condense, Ecole Polytechnique, CNRS, Université Paris Saclay, Route de Saclay, 91128 Palaiseau cedex, France.
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Valotto G, Cattaruzza E, Mardegan M, Quaranta A. PARAFAC analysis of IBIL spectra from silver ion exchanged glasses. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2017; 171:346-350. [PMID: 27566921 DOI: 10.1016/j.saa.2016.08.024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2016] [Revised: 08/11/2016] [Accepted: 08/16/2016] [Indexed: 06/06/2023]
Abstract
In this work we present for the first time an application of PARAllel FACtor (PARAFAC) analysis to the investigation of Ion Beam Induced Luminescence (IBIL) spectra of Ag+↔Na+ ion exchanged silicate glasses, in order to check the possibility to obtain additional information on the formation of silver aggregates under ion irradiation by a proper statistical rearrangement of experimental spectra. We decomposed the data by PARAFAC taking into account both IBIL emission features and their evolution as a function of the time. Shape and trend under irradiation of the extracted components were correlated to silver concentration and aggregates in the investigated systems. Strength and weakness of this statistical approach applied to IBIL spectra recorded as a function of time were evidenced and discussed.
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Affiliation(s)
- G Valotto
- Dipartimento di Scienze Ambientali, Informatica e Statistica, Università Ca' Foscari Venezia, I-30123 Venezia, Italy.
| | - E Cattaruzza
- Centro per le Nanoscienze e i Nanobiomateriali, Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca' Foscari Venezia, I-30123 Venezia, Italy
| | - M Mardegan
- Centro per le Nanoscienze e i Nanobiomateriali, Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca' Foscari Venezia, I-30123 Venezia, Italy
| | - A Quaranta
- Dipartimento di Ingegneria Industriale, Università di Trento, via Mesiano 77, Povo, 38123 Trento, Italy; INFN, - TIFPA, Trento Institute of Fundamental and Applied Physics, via Sommarive 14, Povo, I-38123 Trento, Italy
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Lakade AJ, Sundar K, Shetty PH. Nanomaterial-based sensor for the detection of milk spoilage. Lebensm Wiss Technol 2017. [DOI: 10.1016/j.lwt.2016.10.031] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Mawale RM, Alberti M, Zhang B, Fraenkl M, Wagner T, Havel J. Structural elucidation of AgAsS2 glass by the analysis of clusters formed during laser desorption ionisation applying quadrupole ion trap time-of-flight mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2016; 30:594-602. [PMID: 26842581 DOI: 10.1002/rcm.7479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2015] [Revised: 12/03/2015] [Accepted: 12/07/2015] [Indexed: 06/05/2023]
Abstract
RATIONALE The structure of AgA(s)S2 glass, which has a broad range of applications, is still not well understood and a systematic mass spectrometric analysis of AgA(s)S2 glass is currently not available. Elucidation of the structure should help in the development of this material. METHODS The AgA(s)S2 glass was prepared by the melt-quenched technique. Laser desorption ionisation (LDI) using quadrupole ion trap time-of-flight mass spectrometry (QIT-TOFMS) was used to follow the generation of Ag(m)As(n)S(x) clusters. The stoichiometry of the clusters generated was determined via collision-induced dissociation (CID) and modelling of isotopic patterns. The AgA(s)S2 glass was characterised by transmission electron microscopy (TEM), scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) spectroscopy. RESULTS The LDI of AgA(s)S2 glass leads to the formation of unary (Ag+/− and As(3+)) species, 38 binary (As(n)S(x), Ag(m)S(x)), and 98 ternary (Ag(m)As(n)S(x)) singly charged clusters. The formation of silver-rich nano-grains during AgA(s)S2 glass synthesis has been identified using TEM analysis and also verified by QIT-TOFMS. CONCLUSIONS TOFMS was shown to be a useful technique to study the generation of Ag(m)As(n)S(x )clusters. SEM, TEM and EDX analysis proved that the structure of AgA(s)S2 glass is ‘grain-like’ where grains are either: (1) Silver-rich ‘islands’ (Ag(m,) m up to 39) connected by arsenic and/or sulfur or arsenic sulfide chains or (2) silver sulfide (Ag2S)m (m = 9-20) clusters also similarly inter-connected. This obtained structural information may be useful for the development of ultra-high-density phase-change storage and memory devices using this kind of glass as a base.
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Affiliation(s)
- Ravi Madhukar Mawale
- Department of Chemistry, Faculty of Science, Masaryk University, Kamenice 5/A14, 625 00, Brno, Czech Republic
| | - Milan Alberti
- Department of Chemistry, Faculty of Science, Masaryk University, Kamenice 5/A14, 625 00, Brno, Czech Republic
- Department of Physical Electronics, Faculty of Science, Masaryk University, Kotlářská 2, 611 37, Brno, Czech Republic
| | - Bo Zhang
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentska 95, Pardubice, 53210, Czech Republic
| | - Max Fraenkl
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentska 95, Pardubice, 53210, Czech Republic
| | - Tomas Wagner
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentska 95, Pardubice, 53210, Czech Republic
| | - Josef Havel
- Department of Chemistry, Faculty of Science, Masaryk University, Kamenice 5/A14, 625 00, Brno, Czech Republic
- Department of Physical Electronics, Faculty of Science, Masaryk University, Kotlářská 2, 611 37, Brno, Czech Republic
- CEPLANT, R&D Centre for low-cost plasma and nanotechnology surface modifications, Masaryk University, Kotlářská 2, 611 37, Brno, Czech Republic
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Abbass AE, Swart HC, Kroon RE. White luminescence from sol–gel silica doped with silver. JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY 2015; 76:708-714. [DOI: 10.1007/s10971-015-3825-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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50
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Maurizio C, Cesca T, Perotto G, Kalinic B, Michieli N, Scian C, Joly Y, Battaglin G, Mazzoldi P, Mattei G. Core-shell-like Au sub-nanometer clusters in Er-implanted silica. NANOSCALE 2015; 7:8968-8977. [PMID: 25921415 DOI: 10.1039/c5nr01564b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The very early steps of Au metal cluster formation in Er-doped silica have been investigated by high-energy resolution fluorescence-detected X-ray absorption spectroscopy (HERFD-XAS). A combined analysis of the near-edge and extended part of the experimental spectra shows that Au cluster nucleation starts from a few Au and O atoms covalently interconnected, likely in the presence of embryonic Au-Au correlation. The first Au clusters, characterized by a well defined Au-Au coordination distance, form upon 400 °C inert annealing. The estimated upper limit of the Gibbs free energy for the associated heterogeneous nucleation is 0.06 eV per atom, suggesting that the Au nucleation is assisted by matrix defects, most likely non-bridging oxygen atoms. The experimental results indicate that the formed subnanometer Au clusters can be applied as effective core-shell systems in which the Au atoms of the 'core' develop a metallic character, whereas the Au atoms in the 'shell' can retain a partially covalent bond with O atoms of the silica matrix. High structural disorder at the Au site is found upon neutral annealing at a moderate temperature (600 °C), likely driven by the configurational disorder of the defective silica matrix. A suitable choice of the Au concentration and annealing temperature allows tailoring of the Au cluster size in the sub-nanometer range. The interaction of the Au cluster surface with the surrounding silica matrix is likely responsible for the infrared luminescence previously reported on the same systems.
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Affiliation(s)
- Chiara Maurizio
- Physics and Astronomy Department and CNISM, University of Padova, via Marzolo 8, I-35131 Padova, Italy.
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