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Morales Betancourt AL, Shaji S, Flores E, Nash KL. Synthesis and characterization of MoSe 2 nanoscrolls via pulsed laser ablation in deep eutectic solvents. NANOSCALE 2024. [PMID: 38826113 DOI: 10.1039/d4nr01466a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2024]
Abstract
There is ongoing interest in the rapid, reproducible production of 2-dimensional (2-D) transition metal dichalcogenides (TMD), such as molybdenum-based TMD (MoX2), where X is a chalcogen atom such as sulphur (S), selenium (Se) or tellurium (Te), driven by their unique optical and electronic properties. Once fabricated into an atomically thin layer structure, these materials have a direct-indirect bandgap transition, strong spin-orbit coupling, and favourable electronic and mechanical strain-dependent properties which are attractive for electronics. Pulsed laser ablation in liquid (PLAL) is an economic, green alternative for synthesis of TMD. It has been shown that in the case of MoX2, the chemical processes during the plasma phase of the ablation can yield the formation of multispecies, including MoOx quantum dots when oxygen-containing solvents are used. Here, we introduce the formation of MoSe2 nanoscrolls with low oxygen content synthesized via pulsed laser ablation in deep eutectic solvents (PLADES). Our results suggest that the synthesis produces a stable colloidal solution of large 2-D structures with tuneable surface charge by replacing the deep eutectic solvent (DES) with DI water. Nuclear Magnetic Resonance (NMR) results suggest that irradiating the solvent at near infrared NIR energy does not affect its chemical composition. NMR also proves that serial washing can completely remove solvent from the nanostructures. Raman shifts suggest the formation of large, thin MoSe2 nanosheets aided by the solvent confinement resulting from van der Waal forces and hydrogen bonds interactions between MoSe2 and urea. Binding energies measured by X-ray photoelectron spectroscopy (XPS) confirm MoSe2-DES preference to form 1T-MoSe2versus molybdenum oxides and 2H MoSe2 in DI-water. Raman and XPS findings were validated by transmission electron microscopy (TEM) and selected area electron diffraction (SAED). Results of this work validate the use of PLADES for the synthesis of stable, crystalline, low-surface-oxygen-content colloidal MoSe2 nanoscrolls in scalable quantities.
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Affiliation(s)
- Alejandro L Morales Betancourt
- Functional Nanomaterials Lab, The University of Texas at San Antonio. Department of Physics and Astronomy, One UTSA Circle, San Antonio, TX, 78249, USA.
| | - Sadasivan Shaji
- Universidad Autónoma de Nuevo León, Faculty of Mechanical and Electrical Engineering, Pedro de Alba SN, Ciudad Universitaria, 66455 San Nicolás de los Garza, N.L., Mexico.
| | - Ernesto Flores
- Functional Nanomaterials Lab, The University of Texas at San Antonio. Department of Physics and Astronomy, One UTSA Circle, San Antonio, TX, 78249, USA.
| | - Kelly L Nash
- Functional Nanomaterials Lab, The University of Texas at San Antonio. Department of Physics and Astronomy, One UTSA Circle, San Antonio, TX, 78249, USA.
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2
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Plech A, Tack M, Huang H, Arefev M, Ziefuss AR, Levantino M, Karadas H, Chen C, Zhigilei LV, Reichenberger S. Physical Regimes and Mechanisms of Picosecond Laser Fragmentation of Gold Nanoparticles in Water from X-ray Probing and Atomistic Simulations. ACS NANO 2024; 18:10527-10541. [PMID: 38567906 DOI: 10.1021/acsnano.3c12314] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/17/2024]
Abstract
Laser fragmentation in liquids has emerged as a promising green chemistry technique for changing the size, shape, structure, and phase composition of colloidal nanoparticles, thus tuning their properties to the needs of practical applications. The advancement of this technique requires a solid understanding of the mechanisms of laser-nanoparticle interactions that lead to the fragmentation. While theoretical studies have made impressive practical and mechanistic predictions, their experimental validation is required. Hence, using the picosecond laser fragmentation of Au nanoparticles in water as a model system, the transient melting and fragmentation processes are investigated with a combination of time-resolved X-ray probing and atomistic simulations. The direct comparison of the diffraction profiles predicted in the simulations and measured in experiments has revealed a sequence of several nonequilibrium processes triggered by the laser irradiation. At low laser fluences, in the regime of nanoparticle melting and resolidification, the results provide evidence of a transient superheating of crystalline nanoparticles above the melting temperature. At fluences about three times the melting threshold, the fragmentation starts with evaporation of Au atoms and their condensation into small satellite nanoparticles. As fluence increases above five times the melting threshold, a transition to a rapid (explosive) phase decomposition of superheated nanoparticles into small liquid droplets and vapor phase atoms is observed. The transition to the phase explosion fragmentation regime is signified by prominent changes in the small-angle X-ray scattering profiles measured in experiments and calculated in simulations. The good match between the experimental and computational diffraction profiles gives credence to the physical picture of the cascade of thermal fragmentation regimes revealed in the simulations and demonstrates the high promise of the joint tightly integrated computational and experimental efforts.
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Affiliation(s)
- Anton Plech
- Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany
| | - Meike Tack
- Department of Technical Chemistry I and Center for Nanointegration Duisburg-Essen, University of Duisburg-Essen, Universitätsstrasse 7, D-45141 Essen, Germany
| | - Hao Huang
- Department of Materials Science and Engineering, University of Virginia, Charlottesville, Virginia 22904-4745, United States
- School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Mikhail Arefev
- Department of Materials Science and Engineering, University of Virginia, Charlottesville, Virginia 22904-4745, United States
| | - Anna R Ziefuss
- Department of Technical Chemistry I and Center for Nanointegration Duisburg-Essen, University of Duisburg-Essen, Universitätsstrasse 7, D-45141 Essen, Germany
| | - Matteo Levantino
- European Synchrotron Radiation Facility, F-38043 Grenoble, France
| | - Hasan Karadas
- Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany
| | - Chaobo Chen
- Department of Materials Science and Engineering, University of Virginia, Charlottesville, Virginia 22904-4745, United States
| | - Leonid V Zhigilei
- Department of Materials Science and Engineering, University of Virginia, Charlottesville, Virginia 22904-4745, United States
| | - Sven Reichenberger
- Department of Technical Chemistry I and Center for Nanointegration Duisburg-Essen, University of Duisburg-Essen, Universitätsstrasse 7, D-45141 Essen, Germany
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3
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Korede V, Nagalingam N, Penha FM, van der Linden N, Padding JT, Hartkamp R, Eral HB. A Review of Laser-Induced Crystallization from Solution. CRYSTAL GROWTH & DESIGN 2023; 23:3873-3916. [PMID: 37159656 PMCID: PMC10161235 DOI: 10.1021/acs.cgd.2c01526] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/04/2023] [Indexed: 05/11/2023]
Abstract
Crystallization abounds in nature and industrial practice. A plethora of indispensable products ranging from agrochemicals and pharmaceuticals to battery materials are produced in crystalline form in industrial practice. Yet, our control over the crystallization process across scales, from molecular to macroscopic, is far from complete. This bottleneck not only hinders our ability to engineer the properties of crystalline products essential for maintaining our quality of life but also hampers progress toward a sustainable circular economy in resource recovery. In recent years, approaches leveraging light fields have emerged as promising alternatives to manipulate crystallization. In this review article, we classify laser-induced crystallization approaches where light-material interactions are utilized to influence crystallization phenomena according to proposed underlying mechanisms and experimental setups. We discuss nonphotochemical laser-induced nucleation, high-intensity laser-induced nucleation, laser trapping-induced crystallization, and indirect methods in detail. Throughout the review, we highlight connections among these separately evolving subfields to encourage the interdisciplinary exchange of ideas.
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Affiliation(s)
- Vikram Korede
- Process
& Energy Department, Delft University
of Technology, Leeghwaterstraat 39, 2628 CB Delft, The Netherlands
| | - Nagaraj Nagalingam
- Process
& Energy Department, Delft University
of Technology, Leeghwaterstraat 39, 2628 CB Delft, The Netherlands
| | - Frederico Marques Penha
- Department
of Chemical Engineering, KTH Royal Institute
of Technology, Teknikringen
42, 114-28 Stockholm, Sweden
| | - Noah van der Linden
- Process
& Energy Department, Delft University
of Technology, Leeghwaterstraat 39, 2628 CB Delft, The Netherlands
| | - Johan T. Padding
- Process
& Energy Department, Delft University
of Technology, Leeghwaterstraat 39, 2628 CB Delft, The Netherlands
| | - Remco Hartkamp
- Process
& Energy Department, Delft University
of Technology, Leeghwaterstraat 39, 2628 CB Delft, The Netherlands
| | - Huseyin Burak Eral
- Process
& Energy Department, Delft University
of Technology, Leeghwaterstraat 39, 2628 CB Delft, The Netherlands
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4
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Mansour Y, Battie Y, Naciri AE, Chaoui N. In situmonitoring the productivity of ultra-small gold nanoparticles generated by pulsed-laser ablation of a high-speed rotating gold target in pure water. NANOTECHNOLOGY 2022; 34:075602. [PMID: 36395494 DOI: 10.1088/1361-6528/aca3b0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Accepted: 11/17/2022] [Indexed: 06/16/2023]
Abstract
We investigate the productivity of ultra-small gold nanoparticles generated by pulsed-laser ablation in liquid of a high-speed rotating gold target as functions of laser ablation time and rotation speed of the target in the range 90-3000 rpm. These experiments were performed byin situmonitoring the extinction spectra of the gold colloidal suspension. The time evolution of the gold volume fraction in the colloidal suspension of the target was determined by modeling the extinction spectra using the shape distribution effective medium theory. The time dependence of the ablation rate, deduced from that of the volume fraction, shows an initial exponential decay followed by a steady-state value at longer ablation time. The influence of the laser-induced roughening of the target surface on the time evolution of the ablation rate is clearly demonstrated. The experimental results also reveal the dependence of the time evolution of the ablation rate of the target on its rotation speed. The effect of the liquid flow on the ablation rate of the target is analyzed and discussed.
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Affiliation(s)
- Yehia Mansour
- Université de Lorraine, Laboratoire de Chimie et Physique-Approche Multi-échelle des Milieux Complexes (LCP-A2MC, EA4632), 1, Boulevard Arago, F-57078 Metz, France
| | - Yann Battie
- Université de Lorraine, Laboratoire de Chimie et Physique-Approche Multi-échelle des Milieux Complexes (LCP-A2MC, EA4632), 1, Boulevard Arago, F-57078 Metz, France
| | - Aotmane En Naciri
- Université de Lorraine, Laboratoire de Chimie et Physique-Approche Multi-échelle des Milieux Complexes (LCP-A2MC, EA4632), 1, Boulevard Arago, F-57078 Metz, France
| | - Nouari Chaoui
- Université de Lorraine, Laboratoire de Chimie et Physique-Approche Multi-échelle des Milieux Complexes (LCP-A2MC, EA4632), 1, Boulevard Arago, F-57078 Metz, France
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5
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A comprehensive analysis of meloxicam particles produced by nanosecond laser ablation as a wet milling technique. Sci Rep 2022; 12:12551. [PMID: 35869132 PMCID: PMC9307616 DOI: 10.1038/s41598-022-16728-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Accepted: 07/14/2022] [Indexed: 11/30/2022] Open
Abstract
Recently, the number of water insoluble and poorly soluble drug compounds has increased significantly. Therefore, growing interest has been witnessed in different particle size reduction techniques to improve the dissolution rates, transport characteristics and bioavailability of drugs. Laser ablation has proven to be an alternative method to the production of nano- and micrometre-sized drug particles without considerable chemical damage. We present the nanosecond laser ablation of drug pastilles in distilled water, targeting meloxicam, a poorly water soluble nonsteroidal anti-inflammatory drug, at different laser wavelengths (248 nm, 532 nm and 1064 nm). Besides chemical characterization, crystallinity, morphology and particle size studies, the mechanism of the particle generation process was examined. The applicability of ablated particles in drug formulation was investigated by solubility, cytotoxicity and anti-inflammatory effect measurements. We showed that laser ablation is a clean, efficient and chemically non-damaging method to reduce the size of meloxicam particles to the sub-micrometre–few micrometre size range, which is optimal for pulmonary drug delivery. Complemented by the excellent solubility (four to nine times higher) and anti-inflammatory (four to five times better) properties of the particles compared to the initial drug, laser ablation is predicted to have wider applications in the development of drug formulations.
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Mehta K, Baruah PK. A comprehensive review and outlook on the experimental techniques to investigate the complex dynamics of pulsed laser ablation in liquid for nanoparticle synthesis. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2022; 93:091501. [PMID: 36182489 DOI: 10.1063/5.0084803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Accepted: 07/27/2022] [Indexed: 06/16/2023]
Abstract
Pulsed laser ablation in liquid (PLAL) has been established as one of the most efficient and impactful methods for producing pure and ligand-free nanoparticles (NPs). PLAL has successfully been utilized for the synthesis of metal NPs, semiconductor NPs, ceramic NPs, and even nanocomposites. A variety of NPs, including core-shell, nanocubes, nanorods, and many other complex structures, can be synthesized using PLAL. The versatility associated with PLAL has led to the synthesis of NPs that have found applications in the field of biomedicine, sensing technology, energy harvesting, and various industries. Despite all the aforementioned advantages, there has been an ambiguity in terms of conditions/parameters for the nanoparticle synthesis as reported by various research groups. This has led to a perception that PLAL provides little or no control over the properties of the synthesized NPs. The properties of the NPs are reliant on transient dynamics caused due to a high-intensity laser's interaction with the target material. To understand the process of nanoparticle synthesis and to control the properties of NPs, it is critical to understand the various processes that occur during PLAL. The investigation of PLAL is essential for understanding the dynamical processes involved. However, the investigation techniques employed to probe PLAL present their own set of difficulties, as high temporal as well as spatial resolution is a prerequisite to probe PLAL. Hence, the purpose of this Review is to understand the dynamical processes of PLAL and gain an insight into the various investigation techniques and their data interpretation. In addition to the current challenges, some ways of overcoming these challenges are also presented. The benefits of concurrent investigations with special emphasis on the simultaneous investigation by multiple techniques are summarized, and furthermore, a few examples are also provided to help the readers understand how the simultaneous investigation works.
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Affiliation(s)
- Kavil Mehta
- Department of Physics, Pandit Deendayal Energy University, Gandhinagar 382426, Gujarat, India
| | - Prahlad K Baruah
- Department of Physics, Pandit Deendayal Energy University, Gandhinagar 382426, Gujarat, India
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7
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Chen C, Zhigilei LV. Ultrashort pulse laser ablation in liquids: probing the first nanoseconds of underwater phase explosion. LIGHT, SCIENCE & APPLICATIONS 2022; 11:111. [PMID: 35477907 PMCID: PMC9046377 DOI: 10.1038/s41377-022-00800-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The ultrafast pump-probe microscopy has shed new light on the complex dynamics of laser-induced explosive phase transformations and highlighted the importance of close integration of experimental, computational, and theoretical efforts.
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Affiliation(s)
- Chaobo Chen
- Department of Materials Science and Engineering, University of Virginia, 395 McCormick Road, Charlottesville, VA, 22904-4745, USA
| | - Leonid V Zhigilei
- Department of Materials Science and Engineering, University of Virginia, 395 McCormick Road, Charlottesville, VA, 22904-4745, USA.
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8
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Spellauge M, Doñate-Buendía C, Barcikowski S, Gökce B, Huber HP. Comparison of ultrashort pulse ablation of gold in air and water by time-resolved experiments. LIGHT, SCIENCE & APPLICATIONS 2022; 11:68. [PMID: 35322802 PMCID: PMC8943017 DOI: 10.1038/s41377-022-00751-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Revised: 01/31/2022] [Accepted: 02/22/2022] [Indexed: 06/14/2023]
Abstract
Laser ablation in liquids is a highly interdisciplinary method at the intersection of physics and chemistry that offers the unique opportunity to generate surfactant-free and stable nanoparticles from virtually any material. Over the last decades, numerous experimental and computational studies aimed to reveal the transient processes governing laser ablation in liquids. Most experimental studies investigated the involved processes on timescales ranging from nanoseconds to microseconds. However, the ablation dynamics occurring on a sub-nanosecond timescale are of fundamental importance, as the conditions under which nanoparticles are generated are established within this timeframe. Furthermore, experimental investigations of the early timescales are required to test computational predictions. We visualize the complete spatiotemporal picosecond laser-induced ablation dynamics of gold immersed in air and water using ultrafast pump-probe microscopy. Transient reflectivity measurements reveal that the water confinement layer significantly influences the ablation dynamics on the entire investigated timescale from picoseconds to microseconds. The influence of the water confinement layer includes the electron injection and subsequent formation of a dense plasma on a picosecond timescale, the confinement of ablation products within hundreds of picoseconds, and the generation of a cavitation bubble on a nanosecond timescale. Moreover, we are able to locate the temporal appearance of secondary nanoparticles at about 600 ps after pulse impact. The results support computational predictions and provide valuable insight into the early-stage ablation dynamics governing laser ablation in liquids.
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Affiliation(s)
- Maximilian Spellauge
- Department of Applied Sciences and Mechatronics, Munich University of Applied Sciences, Lothstraße 34, 80335, Munich, Germany
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141, Essen, Germany
| | - Carlos Doñate-Buendía
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141, Essen, Germany
- Materials Science and Additive Manufacturing, School of Mechanical Engineering and Safety Engineering, University of Wuppertal, 42119, Wuppertal, Germany
| | - Stephan Barcikowski
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141, Essen, Germany
| | - Bilal Gökce
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141, Essen, Germany.
- Materials Science and Additive Manufacturing, School of Mechanical Engineering and Safety Engineering, University of Wuppertal, 42119, Wuppertal, Germany.
| | - Heinz P Huber
- Department of Applied Sciences and Mechatronics, Munich University of Applied Sciences, Lothstraße 34, 80335, Munich, Germany.
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9
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Tabayashi Y, Sakaki S, Koshizaki N, Yamauchi Y, Ishikawa Y. Behavior of Thermally Induced Nanobubbles during Instantaneous Particle Heating by Pulsed Laser Melting in Liquid. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:7167-7175. [PMID: 34078084 DOI: 10.1021/acs.langmuir.1c00736] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Pulsed laser melting in liquid (PLML) is a technique to produce submicrometer spherical particles (SMPs). In this process, raw particles dispersed in liquid are selectively heated, and thermally induced nanobubbles (TINBs) at the particle surface are generated and act as a thermal barrier to enhance the temperature increase during heating. However, monitoring TINBs is difficult since PLML is a low-temperature, nonplasma process. Simple transmittance measurements of monodisperse Au SMP (250 nm) colloidal solutions on a transient time scale were used to monitor the temporal dependence of the TINB thickness and the pressure within the bubble. By applying this technique for ZnO and Sn SMP formation, TINBs in the PLML process are important in promoting the formation of large particles via particle merging during laser heating.
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Affiliation(s)
- Yasunori Tabayashi
- Graduate School of Engineering, Hokkaido University, Kita 13, Nishi 8, Kita-ku, Sapporo, Hokkaido 060-8628, Japan
| | - Shota Sakaki
- Graduate School of Engineering, Hokkaido University, Kita 13, Nishi 8, Kita-ku, Sapporo, Hokkaido 060-8628, Japan
| | - Naoto Koshizaki
- Graduate School of Engineering, Hokkaido University, Kita 13, Nishi 8, Kita-ku, Sapporo, Hokkaido 060-8628, Japan
| | - Yuji Yamauchi
- Graduate School of Engineering, Hokkaido University, Kita 13, Nishi 8, Kita-ku, Sapporo, Hokkaido 060-8628, Japan
| | - Yoshie Ishikawa
- Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
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10
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Forsythe RC, Cox CP, Wilsey MK, Müller AM. Pulsed Laser in Liquids Made Nanomaterials for Catalysis. Chem Rev 2021; 121:7568-7637. [PMID: 34077177 DOI: 10.1021/acs.chemrev.0c01069] [Citation(s) in RCA: 42] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Catalysis is essential to modern life and has a huge economic impact. The development of new catalysts critically depends on synthetic methods that enable the preparation of tailored nanomaterials. Pulsed laser in liquids synthesis can produce uniform, multicomponent, nonequilibrium nanomaterials with independently and precisely controlled properties, such as size, composition, morphology, defect density, and atomistic structure within the nanoparticle and at its surface. We cover the fundamentals, unique advantages, challenges, and experimental solutions of this powerful technique and review the state-of-the-art of laser-made electrocatalysts for water oxidation, oxygen reduction, hydrogen evolution, nitrogen reduction, carbon dioxide reduction, and organic oxidations, followed by laser-made nanomaterials for light-driven catalytic processes and heterogeneous catalysis of thermochemical processes. We also highlight laser-synthesized nanomaterials for which proposed catalytic applications exist. This review provides a practical guide to how the catalysis community can capitalize on pulsed laser in liquids synthesis to advance catalyst development, by leveraging the synergies of two fields of intensive research.
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Affiliation(s)
- Ryland C Forsythe
- Department of Chemical Engineering, University of Rochester, Rochester, New York 14627, United States
| | - Connor P Cox
- Materials Science Program, University of Rochester, Rochester, New York 14627, United States
| | - Madeleine K Wilsey
- Materials Science Program, University of Rochester, Rochester, New York 14627, United States
| | - Astrid M Müller
- Department of Chemical Engineering, University of Rochester, Rochester, New York 14627, United States.,Materials Science Program, University of Rochester, Rochester, New York 14627, United States.,Department of Chemistry, University of Rochester, Rochester, New York 14627, United States
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11
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Lévy A, De Anda Villa M, Laurens G, Blanchet V, Bozek J, Gaudin J, Lamour E, Macé S, Mignon P, Milosavljević AR, Nicolas C, Patanen M, Prigent C, Robert E, Steydli S, Trassinelli M, Vernhet D, Veteläinen O, Amans D. Surface Chemistry of Gold Nanoparticles Produced by Laser Ablation in Pure and Saline Water. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:5783-5794. [PMID: 33939435 DOI: 10.1021/acs.langmuir.1c00092] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Pulsed laser ablation in liquid (PLAL) is a powerful method for producing nanoparticle colloids with a long-term stability despite the absence of stabilizing organic agents. The colloid stability involves different reactivities and chemical equilibria with complex ionic-specific effects at the nanoparticle/solvent interface which must be strongly influenced by their chemical composition. In this work, the surface composition of PLAL-produced gold nanoparticles in alkaline and saline (NaBr) water is investigated by X-ray photoelectron spectroscopy on free-flying nanoparticles, exempt from any substrate or radiation damage artifact. The Au 4f photoelectron spectra with a depth profiling investigation are used to evaluate the degree of nanoparticle surface oxidation. In alkaline water, the results preclude any surface oxidation contrary to the case of nanoparticles produced in NaBr solution. In addition, the analysis of Br 3d core-level photoelectron spectra agrees with a clear signature of Br on the nanoparticle surface, which is confirmed by a specific valence band feature. This experimental study is supported by DFT calculations, evaluating the energy balance of halide adsorption on different configurations of gold surfaces including oxidation or adsorbed salts.
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Affiliation(s)
- Anna Lévy
- Institut des Nanosciences de Paris, Sorbonne Université, Campus Pierre et Marie Curie, CNRS UMR7588, 75005 Paris, France
| | - Manuel De Anda Villa
- Institut des Nanosciences de Paris, Sorbonne Université, Campus Pierre et Marie Curie, CNRS UMR7588, 75005 Paris, France
| | - Gaétan Laurens
- Université Claude Bernard Lyon 1, UMR5306 CNRS, Institut Lumière Matière, University of Lyon, F-69622 Villeurbanne, France
| | - Valérie Blanchet
- CNRS, CEA, CELIA (Centre Lasers Intenses et Applications), University of Bordeaux, UMR5107, F-33405 Talence, France
| | - John Bozek
- L'Orme des Merisiers, Synchrotron SOLEIL, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette Cedex, France
| | - Jérôme Gaudin
- CNRS, CEA, CELIA (Centre Lasers Intenses et Applications), University of Bordeaux, UMR5107, F-33405 Talence, France
| | - Emily Lamour
- Institut des Nanosciences de Paris, Sorbonne Université, Campus Pierre et Marie Curie, CNRS UMR7588, 75005 Paris, France
| | - Stéphane Macé
- Institut des Nanosciences de Paris, Sorbonne Université, Campus Pierre et Marie Curie, CNRS UMR7588, 75005 Paris, France
| | - Pierre Mignon
- Université Claude Bernard Lyon 1, UMR5306 CNRS, Institut Lumière Matière, University of Lyon, F-69622 Villeurbanne, France
| | | | - Christophe Nicolas
- L'Orme des Merisiers, Synchrotron SOLEIL, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette Cedex, France
| | - Minna Patanen
- Nano and Molecular Systems Research Unit, Faculty of Science, University of Oulu, P.O. Box 3000, FI-90014 Oulu, Finland
| | - Christophe Prigent
- Institut des Nanosciences de Paris, Sorbonne Université, Campus Pierre et Marie Curie, CNRS UMR7588, 75005 Paris, France
| | - Emmanuel Robert
- L'Orme des Merisiers, Synchrotron SOLEIL, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette Cedex, France
| | - Sébastien Steydli
- Institut des Nanosciences de Paris, Sorbonne Université, Campus Pierre et Marie Curie, CNRS UMR7588, 75005 Paris, France
| | - Martino Trassinelli
- Institut des Nanosciences de Paris, Sorbonne Université, Campus Pierre et Marie Curie, CNRS UMR7588, 75005 Paris, France
| | - Dominique Vernhet
- Institut des Nanosciences de Paris, Sorbonne Université, Campus Pierre et Marie Curie, CNRS UMR7588, 75005 Paris, France
| | - Onni Veteläinen
- Nano and Molecular Systems Research Unit, Faculty of Science, University of Oulu, P.O. Box 3000, FI-90014 Oulu, Finland
| | - David Amans
- Université Claude Bernard Lyon 1, UMR5306 CNRS, Institut Lumière Matière, University of Lyon, F-69622 Villeurbanne, France
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12
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Kalus M, Barcikowski S, Gökce B. How the Physicochemical Properties of the Bulk Material Affect the Ablation Crater Profile, Mass Balance, and Bubble Dynamics During Single-Pulse, Nanosecond Laser Ablation in Water. Chemistry 2021; 27:5978-5991. [PMID: 33496348 PMCID: PMC8048872 DOI: 10.1002/chem.202005087] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Indexed: 11/06/2022]
Abstract
Understanding the key steps that drive the laser-based synthesis of colloids is a prerequisite for learning how to optimize the ablation process in terms of nanoparticle output and functional design of the nanomaterials. Even though many studies focus on cavitation bubble formation using single-pulse ablation conditions, the ablation efficiency and nanoparticle properties are typically investigated under prolonged ablation conditions with repetition rate lasers. Linking single-pulse and multiple-pulse ablation is difficult due to limitations induced by gas formation cross-effects, which occur on longer timescales and depend on the target materials' oxidation-sensitivity. Therefore, this study investigates the ablation and cavitation bubble dynamics under nanosecond, single laser pulse conditions for six different bulk materials (Au, Ag, Cu, Fe, Ti, and Al). Also, the effective threshold fluences, ablation volumes, and penetration depths are quantified for these materials. The thermal and chemical properties of the corresponding bulk materials not only favor the formation of larger spot sizes but also lead to the highest molar ablation efficiencies for low melting materials such as aluminum. Furthermore, the concept of the cavitation bubble growth linked with the oxidation sensitivity of the ablated material is discussed. With this, evidence is provided that intensive chemical reactions occurring during the very early timescale of ablation are significantly enhanced by the bubble collapse.
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Affiliation(s)
- Mark‐Robert Kalus
- Technical Chemistry ICenter for Nanointegration Duisburg-Essen (CENIDE)University of Duisburg-Essen45141EssenGermany
| | - Stephan Barcikowski
- Technical Chemistry ICenter for Nanointegration Duisburg-Essen (CENIDE)University of Duisburg-Essen45141EssenGermany
| | - Bilal Gökce
- Technical Chemistry ICenter for Nanointegration Duisburg-Essen (CENIDE)University of Duisburg-Essen45141EssenGermany
- Materials Science and Additive ManufacturingSchool of Mechanical Engineering and Safety EngineeringUniversity of Wuppertal42119WuppertalGermany
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Kapuscinski M, Munier P, Segad M, Bergström L. Two-Stage Assembly of Mesocrystal Fibers with Tunable Diameters in Weak Magnetic Fields. NANO LETTERS 2020; 20:7359-7366. [PMID: 32924498 PMCID: PMC7587140 DOI: 10.1021/acs.nanolett.0c02770] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Controlling the morphology and crystallographic coherence of assemblies of magnetic nanoparticles is a promising route to functional materials. Time-resolved small-angle X-ray scattering (SAXS) was combined with microscopy and scaling analysis to probe and analyze evaporation-induced assembly in levitating drops and thin films of superparamagnetic iron oxide nanocubes in weak magnetic fields. We show that assembly of micrometer-sized mesocrystals with a cubic shape preceded the formation of fibers with a high degree of crystallographic coherence and tunable diameters. The second-stage assembly of aligned cuboidal mesocrystals into fibers was driven by the magnetic field, but the first-stage assembly of the oleate-capped nanocubes was unaffected by weak magnetic fields. The transition from 3D growth of the primary mesocrystals to the second stage 1D assembly of the elongated fibers was related to the size and field dependence of isotropic van der Waals and directional dipolar interactions between the interacting mesocrystals.
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Affiliation(s)
- Martin Kapuscinski
- Department
of Materials and Environmental Chemistry, Stockholm University, 106 91 Stockholm, Sweden
| | - Pierre Munier
- Department
of Materials and Environmental Chemistry, Stockholm University, 106 91 Stockholm, Sweden
| | - Mo Segad
- Department
of Materials and Environmental Chemistry, Stockholm University, 106 91 Stockholm, Sweden
| | - Lennart Bergström
- Department
of Materials and Environmental Chemistry, Stockholm University, 106 91 Stockholm, Sweden
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Amendola V, Amans D, Ishikawa Y, Koshizaki N, Scirè S, Compagnini G, Reichenberger S, Barcikowski S. Room-Temperature Laser Synthesis in Liquid of Oxide, Metal-Oxide Core-Shells, and Doped Oxide Nanoparticles. Chemistry 2020; 26:9206-9242. [PMID: 32311172 PMCID: PMC7497020 DOI: 10.1002/chem.202000686] [Citation(s) in RCA: 80] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2020] [Indexed: 11/06/2022]
Abstract
Although oxide nanoparticles are ubiquitous in science and technology, a multitude of compositions, phases, structures, and doping levels exist, each one requiring a variety of conditions for their synthesis and modification. Besides, experimental procedures are frequently dominated by high temperatures or pressures and by chemical contaminants or waste. In recent years, laser synthesis of colloids emerged as a versatile approach to access a library of clean oxide nanoparticles relying on only four main strategies running at room temperature and ambient pressure: laser ablation in liquid, laser fragmentation in liquid, laser melting in liquid and laser defect-engineering in liquid. Here, established laser-based methodologies are reviewed through the presentation of a panorama of oxide nanoparticles which include pure oxidic phases, as well as unconventional structures like defective or doped oxides, non-equilibrium compounds, metal-oxide core-shells and other anisotropic morphologies. So far, these materials showed several useful properties that are discussed with special emphasis on catalytic, biomedical and optical application. Yet, given the endless number of mixed compounds accessible by the laser-assisted methodologies, there is still a lot of room to expand the library of nano-crystals and to refine the control over products as well as to improve the understanding of the whole process of nanoparticle formation. To that end, this review aims to identify the perspectives and unique opportunities of laser-based synthesis and processing of colloids for future studies of oxide nanomaterial-oriented sciences.
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Affiliation(s)
- Vincenzo Amendola
- Department of Chemical SciencesUniversity of PadovaVia Marzolo 135131ParovaItaly
| | - David Amans
- CNRSInstitut Lumière MatièreUniv Lyon, Université Claude Bernard Lyon 1
| | - Yoshie Ishikawa
- Nanomaterials Research InstituteNational Institute of Advanced Industrial Science and Technology (AIST)Tsukuba Central 5, 1-1-1 HigashiTsukubaIbaraki305-8565Japan
| | - Naoto Koshizaki
- Graduate School of EngineeringHokkaido UniversityKita 13 Nishi 8, Kita-kuSapporoHokkaido060-8628Japan
| | - Salvatore Scirè
- Department of Chemical SciencesUniversity of CataniaViale A. Doria 6Catania95125Italy
| | - Giuseppe Compagnini
- Department of Chemical SciencesUniversity of CataniaViale A. Doria 6Catania95125Italy
| | - Sven Reichenberger
- Technical Chemistry I andCenter for Nanointegration Duisburg-Essen (CENIDE)University Duisburg-EssenUniversitätstr. 745141EssenGermany
| | - Stephan Barcikowski
- Technical Chemistry I andCenter for Nanointegration Duisburg-Essen (CENIDE)University Duisburg-EssenUniversitätstr. 745141EssenGermany
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15
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Reich S, Göttlicher J, Ziefuss A, Streubel R, Letzel A, Menzel A, Mathon O, Pascarelli S, Baumbach T, Zuber M, Gökce B, Barcikowski S, Plech A. In situ speciation and spatial mapping of Zn products during pulsed laser ablation in liquids (PLAL) by combined synchrotron methods. NANOSCALE 2020; 12:14011-14020. [PMID: 32579650 DOI: 10.1039/d0nr01500h] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Pulsed laser ablation in liquids is a hierarchical multi-step process to produce pure inorganic nanoparticle colloids. Controlling this process is hampered by the partial understanding of individual steps and structure formation. In situ X-ray methods are employed to resolve macroscopic dynamics of nanosecond PLAL as well to analyse the distribution and speciation of ablated species with a microsecond time resolution. High time resolution can be achieved by synchrotron-based methods that are capable of 'single-shot' acquisition. X-ray multicontrast imaging by a Shack-Hartmann setup (XHI) and small angle X-ray scattering (SAXS) resolve evolving nanoparticles inside the transient cavitation bubble, while X-ray absorption spectroscopy in dispersive mode opens access to the total material yield and the chemical state of the ejecta. It is confirmed that during ablation nanoparticles are produced directly as well as reactive material is detected, which is identified in the early stage as Zn atoms. Nanoparticles within the cavitation bubble show a metal signature, which prevails for milliseconds, before gradual oxidation sets in. Ablation is described by a phase explosion of the target coexisting with full evaporation. Oxidation occurs only as a later step to already formed nanoparticles.
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Affiliation(s)
- Stefan Reich
- Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany.
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Ando K, Nakajima T. Clear observation of the formation of nanoparticles inside the ablation bubble through a laser-induced flat transparent window by laser scattering. NANOSCALE 2020; 12:9640-9646. [PMID: 32319454 DOI: 10.1039/c9nr10560c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
To understand the formation mechanism of nanoparticles via laser ablation in liquids direct observation of the dynamics inside the ablation bubble is essential. One powerful technique for this is small-angle X-ray scattering. Applying the laser-scattering technique in a similar context faces some difficulties, because, firstly the probe laser does not easily go into the bubble due to the curved bubble surface, and secondly the extremely weak scattering signal from inside the bubble is overwhelmed by the very strong reflection at the bubble surface. In this paper we solve those two problems by sending the probe laser into the bubble through a laser-induced flat transparent window, and demonstrate the clean observation of laser-scattering signals from the inside of the ablation bubble. We observe the signature of the formation of nanoparticles around the two areas inside the bubble, i.e., around the central area and apex inside the bubble. The scattering signals originating from the centre of the bubble persist throughout the entire growth and shrinkage stages of the bubble, while practically no scattering signals are found outside the bubble and this clearly implies that almost all nanoparticles are formed inside the bubble. Interestingly, the scattering signals originating from the apex inside the bubble gradually emerge after the bubble reaches the maximum size, and they become brighter as it further shrinks. Those findings are consistent with the scenario of nanoparticle formation obtained by small-angle X-ray scattering experiments.
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Affiliation(s)
- Kota Ando
- Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan.
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Shih CY, Gnilitskyi I, Shugaev MV, Skoulas E, Stratakis E, Zhigilei LV. Effect of a liquid environment on single-pulse generation of laser induced periodic surface structures and nanoparticles. NANOSCALE 2020; 12:7674-7687. [PMID: 32207758 DOI: 10.1039/d0nr00269k] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The effect of a liquid environment on the fundamental mechanisms of surface nanostructuring and generation of nanoparticles by single pulse laser ablation is investigated in a closely integrated computational and experimental study. A large-scale molecular dynamics simulation of spatially modulated ablation of Cr in water reveals a complex picture of the dynamic interaction between the ablation plume and water. Ablation plume is found to be rapidly decelerated by the water environment, resulting the formation and prompt disintegration of a hot metal layer at the interface between the ablation and water. A major fraction of the ablation plume is laterally redistributed and redeposited back to the target, forming smooth frozen surface features. Good agreement between the shapes of the surface features predicted in the simulation and the ones generated in single pulse laser ablation experiments performed for Cr in water supports the mechanistic insights revealed in the simulation. The results of this study suggest that the presence of a liquid environment can eliminate the sharp features of the surface morphology, reduce the amount of the material removed from the target by more than an order of magnitude, and narrow down the nanoparticle size distribution as compared to laser ablation under vacuum. Moreover, the computational predictions of the effective incorporation of molecules constituting the liquid environment into the surface region of the irradiated target and the generation of high vacancy concentrations, exceeding the equilibrium levels by more than an order of magnitude, suggest a potential for hyperdoping of laser-generated surfaces by solutes present in the liquid environment.
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Affiliation(s)
- Cheng-Yu Shih
- Department of Materials Science and Engineering, University of Virginia, 395 McCormick Road, Charlottesville, Virginia 22904-4745, USA.
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18
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Ziefuss AR, Reich S, Reichenberger S, Levantino M, Plech A. In situ structural kinetics of picosecond laser-induced heating and fragmentation of colloidal gold spheres. Phys Chem Chem Phys 2020; 22:4993-5001. [PMID: 32096812 DOI: 10.1039/c9cp05202j] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Fragmentation of colloidal 54 nm gold nanoparticles by picosecond laser pulses is recorded by time-resolved X-ray scattering, giving access to structural dynamics down to a 80 ps resolution. Lattice temperature and energy dissipation have been quantified to verify that the maximum applied fluence of 1800 J m-2 heats up the particles close to boiling. Already within 30 ns, particles with significantly lower particle sizes of 2 to 3 nm are detected, which hints towards an ultrafast process either by a thermal phase explosion or Coulomb instability. An arrested growth is observed on a microsecond time scale resulting in a final particle size of 3-4 nm with high yield. In this context, the fragmentation in a NaCl/NaOH solution seems to limit growth by electrostatic stabilization of fragments, whereas it does not modify the initial product sizes. The laser-induced fragmentation process is identified as a single-step, instantaneous reaction.
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Affiliation(s)
- Anna Rosa Ziefuss
- Department of Technical Chemistry I and Center for Nanointegration Duisburg-Essen CENIDE, University of Duisburg-Essen, Universitätsstrasse 7, D-45141 Essen, Germany
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19
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Shih CY, Shugaev MV, Wu C, Zhigilei LV. The effect of pulse duration on nanoparticle generation in pulsed laser ablation in liquids: insights from large-scale atomistic simulations. Phys Chem Chem Phys 2020; 22:7077-7099. [DOI: 10.1039/d0cp00608d] [Citation(s) in RCA: 51] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The effect of the laser pulse duration on the nanoparticle generation in laser ablation in liquids is investigated; three mechanisms operating at different stages of the ablation process and in different parts of the cavitation bubble are identified.
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Affiliation(s)
- Cheng-Yu Shih
- Department of Materials Science and Engineering
- University of Virginia
- Charlottesville
- USA
- Longterm Concept International Pte Ltd
| | - Maxim V. Shugaev
- Department of Materials Science and Engineering
- University of Virginia
- Charlottesville
- USA
| | - Chengping Wu
- Department of Materials Science and Engineering
- University of Virginia
- Charlottesville
- USA
| | - Leonid V. Zhigilei
- Department of Materials Science and Engineering
- University of Virginia
- Charlottesville
- USA
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20
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Förster GD, Benoit M, Lam J. Alloy, Janus and core-shell nanoparticles: numerical modeling of their nucleation and growth in physical synthesis. Phys Chem Chem Phys 2019; 21:22774-22781. [PMID: 31595276 DOI: 10.1039/c9cp04231h] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
While alloy, core-shell and Janus binary nanoclusters are found in more and more technological applications, their formation mechanisms are still poorly understood, especially during synthesis methods involving physical approaches. In this work, we employ a very simple model of such complex systems using Lennard-Jones interactions and inert gas quenching. After demonstrating the ability of the model to well reproduce the formation of alloy, core-shell or Janus nanoparticles, we studied their temporal evolution from the gas via droplets to nanocrystalline particles. In particular, we showed that the growth mechanisms exhibit qualitative differences between these three chemical orderings. Then, we determined how the quenching rate can be used to finely tune structural characteristics of the final nanoparticles, including size, shape and crystallinity.
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Affiliation(s)
- Georg Daniel Förster
- Laboratoire d'Étude des Microstructures, ONERA-CNRS, UMR104, Université Paris-Saclay, BP 72, 92322 Châtillon Cedex, France
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21
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Kanitz A, Kalus MR, Gurevich EL, Ostendorf A, Barcikowski S, Amans D. Review on experimental and theoretical investigations of the early stage, femtoseconds to microseconds processes during laser ablation in liquid-phase for the synthesis of colloidal nanoparticles. ACTA ACUST UNITED AC 2019. [DOI: 10.1088/1361-6595/ab3dbe] [Citation(s) in RCA: 85] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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22
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Plech A, Krause B, Baumbach T, Zakharova M, Eon S, Girmen C, Buth G, Bracht H. Structural and Thermal Characterisation of Nanofilms by Time-Resolved X-ray Scattering. NANOMATERIALS 2019; 9:nano9040501. [PMID: 30939755 PMCID: PMC6523543 DOI: 10.3390/nano9040501] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/01/2019] [Revised: 03/19/2019] [Accepted: 03/22/2019] [Indexed: 11/16/2022]
Abstract
High time resolution in scattering analysis of thin films allows for determination of thermal conductivity by transient pump-probe detection of dissipation of laser-induced heating, TDXTS. We describe an approach that analyses the picosecond-resolved lattice parameter reaction of a gold transducer layer on pulsed laser heating to determine the thermal conductivity of layered structures below the transducer. A detailed modeling of the cooling kinetics by a Laplace-domain approach allows for discerning effects of conductivity and thermal interface resistance as well as basic depth information. The thermal expansion of the clamped gold film can be calibrated to absolute temperature change and effects of plastic deformation are discriminated. The method is demonstrated on two extreme examples of phononic barriers, isotopically modulated silicon multilayers with very small acoustic impedance mismatch and silicon-molybdenum multilayers, which show a high resistivity.
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Affiliation(s)
- Anton Plech
- Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology, D-76021 Karlsruhe, Germany.
| | - Bärbel Krause
- Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology, D-76021 Karlsruhe, Germany.
| | - Tilo Baumbach
- Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology, D-76021 Karlsruhe, Germany.
- Laboratory for Applications of Synchrotron Radiation, Karlsruhe Institute of Technology, D-76021 Karlsruhe, Germany.
| | - Margarita Zakharova
- Institute of Microstructure Technology, Karlsruhe Institute of Technology, D-76021 Karlsruhe, Germany.
| | - Soizic Eon
- Institute of Materials Physics, University of Muenster, D-48149 Münster, Germany.
| | - Caroline Girmen
- Institute of Materials Physics, University of Muenster, D-48149 Münster, Germany.
| | - Gernot Buth
- Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology, D-76021 Karlsruhe, Germany.
| | - Hartmut Bracht
- Institute of Materials Physics, University of Muenster, D-48149 Münster, Germany.
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