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Carl S, Will J, Madubuko N, Götz A, Przybilla T, Wu M, Raman N, Wirth J, Taccardi N, Zubiri BA, Haumann M, Wasserscheid P, Spiecker E. Structural Evolution of GaO x-Shell and Intermetallic Phases in Ga-Pt Supported Catalytically Active Liquid Metal Solutions. J Phys Chem Lett 2024; 15:4711-4720. [PMID: 38657124 DOI: 10.1021/acs.jpclett.3c03494] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/26/2024]
Abstract
We present a comprehensive scale-bridging characterization approach for supported catalytically active liquid metal solutions (SCALMS) which combines lab-based X-ray microscopy, nano X-ray computed tomography (nano-CT), and correlative analytical transmission electron microscopy. SCALMS catalysts consist of low-melting alloy particles and have demonstrated high catalytic activity, selectivity, and long-term stability in propane dehydrogenation (PDH). We established an identical-location nano-CT workflow which allows us to reveal site-specific changes of Ga-Pt SCALMS before and after PDH. These observations are complemented by analytical transmission electron microscopy investigations providing information on the structure, chemical composition, and phase distribution of individual SCALMS particles. Key findings of this combined microscopic approach include (i) structural evolution of the SCALMS particles' GaOx shell, (ii) Pt segregation toward the oxide shell leading to the formation of Ga-Pt intermetallic phases, and (iii) cracking of the oxide shell accompanied by the release of liquid Ga-Pt toward the porous support.
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Affiliation(s)
- S Carl
- Institute of Micro- and Nanostructure Research (IMN) & Center for Nanoanalysis and Electron Microscopy (CENEM), Interdisciplinary Center for Nanostructured Films (IZNF), Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Cauerstraße 3, 91058 Erlangen, Germany
| | - J Will
- Institute of Micro- and Nanostructure Research (IMN) & Center for Nanoanalysis and Electron Microscopy (CENEM), Interdisciplinary Center for Nanostructured Films (IZNF), Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Cauerstraße 3, 91058 Erlangen, Germany
| | - N Madubuko
- Lehrstuhl für Chemische Reaktionstechnik (CRT), Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen, Germany
| | - A Götz
- Institute of Micro- and Nanostructure Research (IMN) & Center for Nanoanalysis and Electron Microscopy (CENEM), Interdisciplinary Center for Nanostructured Films (IZNF), Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Cauerstraße 3, 91058 Erlangen, Germany
| | - T Przybilla
- Institute of Micro- and Nanostructure Research (IMN) & Center for Nanoanalysis and Electron Microscopy (CENEM), Interdisciplinary Center for Nanostructured Films (IZNF), Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Cauerstraße 3, 91058 Erlangen, Germany
| | - M Wu
- Institute of Micro- and Nanostructure Research (IMN) & Center for Nanoanalysis and Electron Microscopy (CENEM), Interdisciplinary Center for Nanostructured Films (IZNF), Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Cauerstraße 3, 91058 Erlangen, Germany
| | - N Raman
- Lehrstuhl für Chemische Reaktionstechnik (CRT), Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen, Germany
| | - J Wirth
- Institute of Micro- and Nanostructure Research (IMN) & Center for Nanoanalysis and Electron Microscopy (CENEM), Interdisciplinary Center for Nanostructured Films (IZNF), Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Cauerstraße 3, 91058 Erlangen, Germany
| | - N Taccardi
- Lehrstuhl für Chemische Reaktionstechnik (CRT), Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen, Germany
| | - B Apeleo Zubiri
- Institute of Micro- and Nanostructure Research (IMN) & Center for Nanoanalysis and Electron Microscopy (CENEM), Interdisciplinary Center for Nanostructured Films (IZNF), Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Cauerstraße 3, 91058 Erlangen, Germany
| | - M Haumann
- Lehrstuhl für Chemische Reaktionstechnik (CRT), Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen, Germany
- Research Centre for Synthesis and Catalysis, Department of Chemistry, University of Johannesburg, P.O. Box 524, 2006 Auckland Park, South Africa
| | - P Wasserscheid
- Lehrstuhl für Chemische Reaktionstechnik (CRT), Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen, Germany
- Helmholtz-Institute Erlangen-Nürnberg for Renewable Energy (IEK 11), Forschungszentrum Jülich GmbH, Egerlandstr. 3, 91058 Erlangen, Germany
| | - E Spiecker
- Institute of Micro- and Nanostructure Research (IMN) & Center for Nanoanalysis and Electron Microscopy (CENEM), Interdisciplinary Center for Nanostructured Films (IZNF), Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Cauerstraße 3, 91058 Erlangen, Germany
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2
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Schweizer P, Vogl L, Spiecker E, Ophus C, Minor A. Structure and Dynamics of Graphite Intercalation Compounds Analyzed using in situ 4D-STEM. Microsc Microanal 2023; 29:1279-1280. [PMID: 37613685 DOI: 10.1093/micmic/ozad067.654] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/25/2023]
Affiliation(s)
- P Schweizer
- National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA, United States
| | - L Vogl
- National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA, United States
| | - E Spiecker
- Institute for Micro- and Nanoanalysis, FAU Erlangen-Nuremberg, Erlangen, Germany
| | - C Ophus
- National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA, United States
| | - A Minor
- National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA, United States
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3
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Traoré NE, Uttinger MJ, Cardenas Lopez P, Drobek D, Gromotka L, Schmidt J, Walter J, Apeleo Zubiri B, Spiecker E, Peukert W. Green room temperature synthesis of silver-gold alloy nanoparticles. Nanoscale Adv 2023; 5:1450-1464. [PMID: 36866254 PMCID: PMC9972530 DOI: 10.1039/d2na00793b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Accepted: 02/09/2023] [Indexed: 06/18/2023]
Abstract
Metallic alloy nanoparticles (NPs) exhibit interesting optical, electrical and catalytic properties, dependent on their size, shape and composition. In particular, silver-gold alloy NPs are widely applied as model systems to better understand the syntheses and formation (kinetics) of alloy NPs, as the two elements are fully miscible. Our study targets product design via environmentally friendly synthesis conditions. We use dextran as the reducing and stabilizing agent for the synthesis of homogeneous silver-gold alloy NPs at room temperature. Our approach is a one-pot, low temperature, reaction-controlled, green and scalable synthesis route of well-controlled composition and narrow particle size distribution. The composition over a broad range of molar gold contents is confirmed by scanning transmission electron microscopy-energy-dispersive X-ray spectroscopy (STEM-EDX) measurements and auxiliary inductively coupled plasma-optical emission spectroscopy measurements (ICP-OES). The distributions of the resulting particles in size and composition are obtained from multi-wavelength analytical ultracentrifugation using the optical back coupling method and further confirmed by high-pressure liquid chromatography. Finally, we provide insight into the reaction kinetics during the synthesis, discuss the reaction mechanism and demonstrate possibilities for scale-up by a factor of more than 250 by increasing the reactor volume and NP concentration.
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Affiliation(s)
- N E Traoré
- Institute of Particle Technology, Friedrich-Alexander-Universität Erlangen-Nürnberg Cauerstraße 4 91058 Erlangen Germany
- Interdisciplinary Center for Functional Particle Systems, Friedrich-Alexander-Universität Erlangen-Nürnberg Haberstraße 9a 91058 Erlangen Germany
| | - M J Uttinger
- Institute of Particle Technology, Friedrich-Alexander-Universität Erlangen-Nürnberg Cauerstraße 4 91058 Erlangen Germany
- Interdisciplinary Center for Functional Particle Systems, Friedrich-Alexander-Universität Erlangen-Nürnberg Haberstraße 9a 91058 Erlangen Germany
| | - P Cardenas Lopez
- Institute of Particle Technology, Friedrich-Alexander-Universität Erlangen-Nürnberg Cauerstraße 4 91058 Erlangen Germany
- Interdisciplinary Center for Functional Particle Systems, Friedrich-Alexander-Universität Erlangen-Nürnberg Haberstraße 9a 91058 Erlangen Germany
| | - D Drobek
- Institute of Micro- and Nanostructure Research (IMN), Center for Nanoanalysis and Electron Microscopy (CENEM), Interdisciplinary Center for Nanostructured Films (IZNF), Friedrich-Alexander-Universität Erlangen-Nürnberg Cauerstraße 3 91058 Erlangen Germany
| | - L Gromotka
- Institute of Particle Technology, Friedrich-Alexander-Universität Erlangen-Nürnberg Cauerstraße 4 91058 Erlangen Germany
- Interdisciplinary Center for Functional Particle Systems, Friedrich-Alexander-Universität Erlangen-Nürnberg Haberstraße 9a 91058 Erlangen Germany
| | - J Schmidt
- Institute of Particle Technology, Friedrich-Alexander-Universität Erlangen-Nürnberg Cauerstraße 4 91058 Erlangen Germany
- Interdisciplinary Center for Functional Particle Systems, Friedrich-Alexander-Universität Erlangen-Nürnberg Haberstraße 9a 91058 Erlangen Germany
| | - J Walter
- Institute of Particle Technology, Friedrich-Alexander-Universität Erlangen-Nürnberg Cauerstraße 4 91058 Erlangen Germany
- Interdisciplinary Center for Functional Particle Systems, Friedrich-Alexander-Universität Erlangen-Nürnberg Haberstraße 9a 91058 Erlangen Germany
| | - B Apeleo Zubiri
- Institute of Micro- and Nanostructure Research (IMN), Center for Nanoanalysis and Electron Microscopy (CENEM), Interdisciplinary Center for Nanostructured Films (IZNF), Friedrich-Alexander-Universität Erlangen-Nürnberg Cauerstraße 3 91058 Erlangen Germany
| | - E Spiecker
- Institute of Micro- and Nanostructure Research (IMN), Center for Nanoanalysis and Electron Microscopy (CENEM), Interdisciplinary Center for Nanostructured Films (IZNF), Friedrich-Alexander-Universität Erlangen-Nürnberg Cauerstraße 3 91058 Erlangen Germany
| | - W Peukert
- Institute of Particle Technology, Friedrich-Alexander-Universität Erlangen-Nürnberg Cauerstraße 4 91058 Erlangen Germany
- Interdisciplinary Center for Functional Particle Systems, Friedrich-Alexander-Universität Erlangen-Nürnberg Haberstraße 9a 91058 Erlangen Germany
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4
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Cardenas Lopez P, Uttinger MJ, Traoré NE, Khan HA, Drobek D, Apeleo Zubiri B, Spiecker E, Pflug L, Peukert W, Walter J. Multidimensional characterization of noble metal alloy nanoparticles by multiwavelength analytical ultracentrifugation. Nanoscale 2022; 14:12928-12939. [PMID: 36043498 DOI: 10.1039/d2nr02633c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
In this study, we introduce a method for the simultaneous retrieval of two-dimensional size-composition distributions of noble metal Ag-Au alloy nanoparticles utilizing an analytical ultracentrifuge equipped with a multiwavelength extinction detector (MWL-AUC). MWL-AUC is used to measure coupled optical and sedimentation properties of the particles. The optical response of the nanoparticles is calculated using Mie's theory, where the particles' complex refractive index is corrected due to the effect of reduced mean free path of electrons. Using a combined analysis of the hydrodynamic and spectral data captured by MWL-AUC, the size and composition of the alloy particles is retrieved. Our method is validated through the analysis of synthetic data and by the very good agreement between experimental scanning transmission electron microscopy and our AUC data. The presented comprehensive characterization approach contributes to improved synthesis, scale-up and production of particulate systems as it provides a simple, fast and direct method to determine noble metal alloy nanoparticle size and composition distributions simultaneously.
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Affiliation(s)
- P Cardenas Lopez
- Institute of Particle Technology (LFG), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Cauerstr. 4, 91058 Erlangen, Germany.
- Interdisciplinary Center for Functional Particle Systems (FPS), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Haberstr. 9a, 91058 Erlangen, Germany
| | - M J Uttinger
- Institute of Particle Technology (LFG), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Cauerstr. 4, 91058 Erlangen, Germany.
- Interdisciplinary Center for Functional Particle Systems (FPS), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Haberstr. 9a, 91058 Erlangen, Germany
| | - N E Traoré
- Institute of Particle Technology (LFG), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Cauerstr. 4, 91058 Erlangen, Germany.
- Interdisciplinary Center for Functional Particle Systems (FPS), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Haberstr. 9a, 91058 Erlangen, Germany
| | - H A Khan
- Competence Unit for Scientific Computing (CSC), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Martensstr. 5a, 91058 Erlangen, Germany
| | - D Drobek
- Institute of Micro- and Nanostructure Research (IMN) & Center for Nanoanalysis and Electron Microscopy (CENEM), Interdisciplinary Center for Nanostructured Films (IZNF), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Cauerstr. 3, 91058 Erlangen, Germany
| | - B Apeleo Zubiri
- Institute of Micro- and Nanostructure Research (IMN) & Center for Nanoanalysis and Electron Microscopy (CENEM), Interdisciplinary Center for Nanostructured Films (IZNF), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Cauerstr. 3, 91058 Erlangen, Germany
| | - E Spiecker
- Institute of Micro- and Nanostructure Research (IMN) & Center for Nanoanalysis and Electron Microscopy (CENEM), Interdisciplinary Center for Nanostructured Films (IZNF), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Cauerstr. 3, 91058 Erlangen, Germany
| | - L Pflug
- Competence Unit for Scientific Computing (CSC), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Martensstr. 5a, 91058 Erlangen, Germany
| | - W Peukert
- Institute of Particle Technology (LFG), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Cauerstr. 4, 91058 Erlangen, Germany.
- Interdisciplinary Center for Functional Particle Systems (FPS), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Haberstr. 9a, 91058 Erlangen, Germany
| | - J Walter
- Institute of Particle Technology (LFG), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Cauerstr. 4, 91058 Erlangen, Germany.
- Interdisciplinary Center for Functional Particle Systems (FPS), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Haberstr. 9a, 91058 Erlangen, Germany
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5
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Markovskyi A, Gorbenko V, Zorenko T, Yokosawa T, Will J, Spiecker E, Batentschuk M, Elia J, Fedorov A, Zorenko Y. LPE growth of Tb 3Al 5O 12:Ce single crystalline film converters for WLED application. CrystEngComm 2021. [DOI: 10.1039/d1ce00268f] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Efficient phosphor converters for white LEDs based on TbAG:Ce single crystalline films, LPE grown onto YAG substrates, is developed. The film-substrate interface of TbAG:Ce SCF/YAG epitaxial structures was studied using high-resolution STEM images.
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Affiliation(s)
- A. Markovskyi
- Institute of Physics
- Kazimierz Wielki University
- Bydgoszcz
- Poland
| | - V. Gorbenko
- Institute of Physics
- Kazimierz Wielki University
- Bydgoszcz
- Poland
| | - T. Zorenko
- Institute of Physics
- Kazimierz Wielki University
- Bydgoszcz
- Poland
| | - T. Yokosawa
- Institute of Micro- and Nanostructure Research
- and Center for Nanoanalysis and Electron Microscopy (CENEM)
- Friedrich Alexander University of Erlangen-Nuremberg
- Erlangen
- Germany
| | - J. Will
- Institute of Micro- and Nanostructure Research
- and Center for Nanoanalysis and Electron Microscopy (CENEM)
- Friedrich Alexander University of Erlangen-Nuremberg
- Erlangen
- Germany
| | - E. Spiecker
- Institute of Micro- and Nanostructure Research
- and Center for Nanoanalysis and Electron Microscopy (CENEM)
- Friedrich Alexander University of Erlangen-Nuremberg
- Erlangen
- Germany
| | - M. Batentschuk
- Institute of Materials for Electronics and Energy Technology
- University of Erlangen-Nuremberg
- 91058 Erlangen
- Germany
| | - J. Elia
- Institute of Materials for Electronics and Energy Technology
- University of Erlangen-Nuremberg
- 91058 Erlangen
- Germany
| | - A. Fedorov
- SSI Institute for Single Crystals
- National Academy of Sciences of Ukraine
- 61178 Kharkiv
- Ukraine
| | - Yu. Zorenko
- Institute of Physics
- Kazimierz Wielki University
- Bydgoszcz
- Poland
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6
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Tessarek C, Rechberger S, Dieker C, Heilmann M, Spiecker E, Christiansen S. Understanding GaN/InGaN core-shell growth towards high quality factor whispering gallery modes from non-polar InGaN quantum wells on GaN rods. Nanotechnology 2017; 28:485601. [PMID: 29105645 DOI: 10.1088/1361-6528/aa9050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
GaN microrods are used as a basis for subsequent InGaN quantum well (QW) and quantum dot deposition by metal-organic vapor phase epitaxy. The coverage of the shell along the sidewall of rods is dependent on the rod growth time and a complete coverage is obtained for shorter rod growth times. Transmission electron microscopy measurements are performed to reveal the structural properties of the InGaN layer on the sidewall facet and on the top facet. The presence of layers in the microrod and on the microrod surface will be discussed with respect to GaN and InGaN growth. A detailed model will be presented explaining the formation of multiple SiN layers and the partial and full coverage of the shell around the core. Cathodoluminescence measurements are performed to analyze the InGaN emission properties along the microrod and to study the microresonator properties of such hexagonal core-shell structures. High quality factor whispering gallery modes with [Formula: see text] are reported for the first time in a GaN microrod/InGaN non-polar QW core-shell geometry. The GaN/InGaN core-shell microrods are expected to be promising building blocks for low-threshold laser diodes and ultra-sensitive optical sensors.
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Affiliation(s)
- C Tessarek
- Max Planck Institute for the Science of Light, Günther-Scharowsky-Str. 1, D-91058 Erlangen, Germany
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Bochmann S, Fernandez-Pacheco A, Mačković M, Neff A, Siefermann KR, Spiecker E, Cowburn RP, Bachmann J. Systematic tuning of segmented magnetic nanowires into three-dimensional arrays of ‘bits’. RSC Adv 2017. [DOI: 10.1039/c7ra06734h] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A method is presented for the preparation of a three-dimensional magnetic data storage material system.
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Affiliation(s)
- S. Bochmann
- Friedrich-Alexander University of Erlangen-Nürnberg
- Inorganic Chemistry
- 91058 Erlangen
- Germany
| | | | - M. Mačković
- Institute of Micro- and Nanostructure Research (WW9)
- Center for Nanoanalysis and Electron Microscopy (CENEM)
- 91058 Erlangen
- Germany
| | - A. Neff
- Leibniz Institute of Surface Modification (IOM)
- 04318 Leipzig
- Germany
| | - K. R. Siefermann
- Leibniz Institute of Surface Modification (IOM)
- 04318 Leipzig
- Germany
| | - E. Spiecker
- Institute of Micro- and Nanostructure Research (WW9)
- Center for Nanoanalysis and Electron Microscopy (CENEM)
- 91058 Erlangen
- Germany
| | - R. P. Cowburn
- Cavendish Laboratory
- University of Cambridge
- Cambridge CB3 0HE
- UK
| | - J. Bachmann
- Friedrich-Alexander University of Erlangen-Nürnberg
- Inorganic Chemistry
- 91058 Erlangen
- Germany
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8
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Abstract
The impact of reactor type on synthesis parameters and disperse properties.
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Affiliation(s)
- T. Akdas
- Institute of Particle Technology (LFG)
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
- 91058 Erlangen
- Germany
- Cluster of Excellence – Engineering of Advanced Materials (EAM)
| | - M. Haderlein
- Institute of Particle Technology (LFG)
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
- 91058 Erlangen
- Germany
- Cluster of Excellence – Engineering of Advanced Materials (EAM)
| | - J. Walter
- Institute of Particle Technology (LFG)
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
- 91058 Erlangen
- Germany
- Cluster of Excellence – Engineering of Advanced Materials (EAM)
| | - B. Apeleo Zubiri
- Center for Nanoanalysis and Electron Microscopy (CENEM)
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
- 91058 Erlangen
- Germany
- Cluster of Excellence – Engineering of Advanced Materials (EAM)
| | - E. Spiecker
- Center for Nanoanalysis and Electron Microscopy (CENEM)
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
- 91058 Erlangen
- Germany
- Cluster of Excellence – Engineering of Advanced Materials (EAM)
| | - W. Peukert
- Institute of Particle Technology (LFG)
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
- 91058 Erlangen
- Germany
- Cluster of Excellence – Engineering of Advanced Materials (EAM)
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9
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Liebig J, Göken M, Richter G, Mačković M, Przybilla T, Spiecker E, Pierron O, Merle B. A flexible method for the preparation of thin film samples for in situ TEM characterization combining shadow-FIB milling and electron-beam-assisted etching. Ultramicroscopy 2016; 171:82-88. [DOI: 10.1016/j.ultramic.2016.09.004] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2016] [Revised: 08/31/2016] [Accepted: 09/11/2016] [Indexed: 11/25/2022]
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Tessarek C, Fladischer S, Dieker C, Sarau G, Hoffmann B, Bashouti M, Göbelt M, Heilmann M, Latzel M, Butzen E, Figge S, Gust A, Höflich K, Feichtner T, Büchele M, Schwarzburg K, Spiecker E, Christiansen S. Self-Catalyzed Growth of Vertically Aligned InN Nanorods by Metal-Organic Vapor Phase Epitaxy. Nano Lett 2016; 16:3415-3425. [PMID: 27187840 DOI: 10.1021/acs.nanolett.5b03889] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Vertically aligned hexagonal InN nanorods were grown mask-free by conventional metal-organic vapor phase epitaxy without any foreign catalyst. The In droplets on top of the nanorods indicate a self-catalytic vapor-liquid-solid growth mode. A systematic study on important growth parameters has been carried out for the optimization of nanorod morphology. The nanorod N-polarity, induced by high temperature nitridation of the sapphire substrate, is necessary to achieve vertical growth. Hydrogen, usually inapplicable during InN growth due to formation of metallic indium, and silane are needed to enhance the aspect ratio and to reduce parasitic deposition beside the nanorods on the sapphire surface. The results reveal many similarities between InN and GaN nanorod growth showing that the process despite the large difference in growth temperature is similar. Transmission electron microscopy, spatially resolved energy-dispersive X-ray spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and Raman spectroscopy have been performed to analyze the structural properties. Spatially resolved cathodoluminescence investigations are carried out to verify the optical activity of the InN nanorods. The InN nanorods are expected to be the material of choice for high-efficiency hot carrier solar cells.
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Affiliation(s)
- C Tessarek
- Institut für Nanoarchitekturen für die Energieumwandlung, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH , Hahn-Meitner Platz 1, 14109 Berlin, Germany
- Institute of Optics, Information and Photonics, Friedrich-Alexander-University Erlangen-Nürnberg (FAU) , Staudtstr. 7/B2, 91058 Erlangen, Germany
- Max Planck Institute for the Science of Light , Günther-Scharowsky-Str. 1, 91058 Erlangen, Germany
| | - S Fladischer
- Institut für Mikro- und Nanostrukturforschung & Center for Nanoanalysis and Electron Microscopy (CENEM), Friedrich-Alexander-University Erlangen-Nürnberg (FAU) , Cauerstr. 6, 91058 Erlangen, Germany
| | - C Dieker
- Institut für Mikro- und Nanostrukturforschung & Center for Nanoanalysis and Electron Microscopy (CENEM), Friedrich-Alexander-University Erlangen-Nürnberg (FAU) , Cauerstr. 6, 91058 Erlangen, Germany
| | - G Sarau
- Institut für Nanoarchitekturen für die Energieumwandlung, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH , Hahn-Meitner Platz 1, 14109 Berlin, Germany
- Max Planck Institute for the Science of Light , Günther-Scharowsky-Str. 1, 91058 Erlangen, Germany
| | - B Hoffmann
- Institute of Optics, Information and Photonics, Friedrich-Alexander-University Erlangen-Nürnberg (FAU) , Staudtstr. 7/B2, 91058 Erlangen, Germany
- Max Planck Institute for the Science of Light , Günther-Scharowsky-Str. 1, 91058 Erlangen, Germany
| | - M Bashouti
- Max Planck Institute for the Science of Light , Günther-Scharowsky-Str. 1, 91058 Erlangen, Germany
| | - M Göbelt
- Max Planck Institute for the Science of Light , Günther-Scharowsky-Str. 1, 91058 Erlangen, Germany
| | - M Heilmann
- Max Planck Institute for the Science of Light , Günther-Scharowsky-Str. 1, 91058 Erlangen, Germany
| | - M Latzel
- Institute of Optics, Information and Photonics, Friedrich-Alexander-University Erlangen-Nürnberg (FAU) , Staudtstr. 7/B2, 91058 Erlangen, Germany
- Max Planck Institute for the Science of Light , Günther-Scharowsky-Str. 1, 91058 Erlangen, Germany
| | - E Butzen
- Max Planck Institute for the Science of Light , Günther-Scharowsky-Str. 1, 91058 Erlangen, Germany
| | - S Figge
- Institute of Solid State Physics, University of Bremen , Otto-Hahn-Allee 1, 28359 Bremen, Germany
| | - A Gust
- Institute of Solid State Physics, University of Bremen , Otto-Hahn-Allee 1, 28359 Bremen, Germany
| | - K Höflich
- Institut für Nanoarchitekturen für die Energieumwandlung, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH , Hahn-Meitner Platz 1, 14109 Berlin, Germany
- Max Planck Institute for the Science of Light , Günther-Scharowsky-Str. 1, 91058 Erlangen, Germany
| | - T Feichtner
- Institut für Nanoarchitekturen für die Energieumwandlung, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH , Hahn-Meitner Platz 1, 14109 Berlin, Germany
- Max Planck Institute for the Science of Light , Günther-Scharowsky-Str. 1, 91058 Erlangen, Germany
| | - M Büchele
- Max Planck Institute for the Science of Light , Günther-Scharowsky-Str. 1, 91058 Erlangen, Germany
| | - K Schwarzburg
- Institut für Nanoarchitekturen für die Energieumwandlung, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH , Hahn-Meitner Platz 1, 14109 Berlin, Germany
| | - E Spiecker
- Institut für Mikro- und Nanostrukturforschung & Center for Nanoanalysis and Electron Microscopy (CENEM), Friedrich-Alexander-University Erlangen-Nürnberg (FAU) , Cauerstr. 6, 91058 Erlangen, Germany
| | - S Christiansen
- Institut für Nanoarchitekturen für die Energieumwandlung, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH , Hahn-Meitner Platz 1, 14109 Berlin, Germany
- Max Planck Institute for the Science of Light , Günther-Scharowsky-Str. 1, 91058 Erlangen, Germany
- Physics Department, Freie Universität Berlin , Arnimallee 14, 14195 Berlin, Germany
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11
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Hoffmann B, Bashouti MY, Feichtner T, Mačković M, Dieker C, Salaheldin AM, Richter P, Gordan OD, Zahn DRT, Spiecker E, Christiansen S. New insights into colloidal gold flakes: structural investigation, micro-ellipsometry and thinning procedure towards ultrathin monocrystalline layers. Nanoscale 2016; 8:4529-4536. [PMID: 26661036 DOI: 10.1039/c5nr04439a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
High-quality fabrication of plasmonic devices often relies on wet-chemically grown ultraflat, presumably single-crystalline gold flakes due to their superior materials properties. However, important details about their intrinsic structure and their optical properties are not well understood yet. In this study, we present a synthesis routine for large flakes with diameters of up to 70 μm and an in-depth investigation of their structural and optical properties. The flakes are precisely analyzed by transmission electron microscopy, electron backscatter diffraction and micro-ellipsometry. We found new evidence for the existence of twins extending parallel to the Au flake {111} surfaces which have been found to not interfere with the presented nanopatterning. Micro-Ellipsometry was carried out to determine the complex dielectric function and to compare it to previous measurements of bulk single crystalline gold. Finally, we used focused ion beam milling to prepare smooth crystalline layers and high-quality nanostructures with desired thickness down to 10 nm to demonstrate the outstanding properties of the flakes. Our findings support the plasmonics and nano optics community with a better understanding of this material which is ideally suited for superior plasmonic nanostructures.
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Affiliation(s)
- B Hoffmann
- Max Planck Institute for the Science of Light, D-91058 Erlangen, Germany.
| | - M Y Bashouti
- Max Planck Institute for the Science of Light, D-91058 Erlangen, Germany.
| | - T Feichtner
- Helmholtz Zentrum Berlin für Materialien und Energie GmbH, D-14109 Berlin, Germany and Max Planck Institute for the Science of Light, D-91058 Erlangen, Germany.
| | - M Mačković
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Lehrstuhl für Mikro- und Nanostrukturforschung (WW9) & Center for Nanoanalysis and Electron Microscopy, Department Werkstoffwissenschaften, D-91058 Erlangen, Germany
| | - C Dieker
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Lehrstuhl für Mikro- und Nanostrukturforschung (WW9) & Center for Nanoanalysis and Electron Microscopy, Department Werkstoffwissenschaften, D-91058 Erlangen, Germany
| | - A M Salaheldin
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Institute of Particle Technology, D-91058 Erlangen, Germany
| | - P Richter
- Semiconductor Physics, Technische Universität Chemnitz, D-09107 Chemnitz, Germany
| | - O D Gordan
- Semiconductor Physics, Technische Universität Chemnitz, D-09107 Chemnitz, Germany
| | - D R T Zahn
- Semiconductor Physics, Technische Universität Chemnitz, D-09107 Chemnitz, Germany
| | - E Spiecker
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Lehrstuhl für Mikro- und Nanostrukturforschung (WW9) & Center for Nanoanalysis and Electron Microscopy, Department Werkstoffwissenschaften, D-91058 Erlangen, Germany
| | - S Christiansen
- Helmholtz Zentrum Berlin für Materialien und Energie GmbH, D-14109 Berlin, Germany and Max Planck Institute for the Science of Light, D-91058 Erlangen, Germany.
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12
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Akdas T, Walter J, Segets D, Distaso M, Winter B, Birajdar B, Spiecker E, Peukert W. Investigation of the size-property relationship in CuInS2 quantum dots. Nanoscale 2015; 7:18105-18. [PMID: 26469399 DOI: 10.1039/c5nr04291g] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
In this work we investigated fundamental properties of CuInS2 quantum dots in dependence of the particle size distribution (PSD). Size-selective precipitation (SSP) with acetone as poor solvent was performed as an adequate post-processing step. Our results provide deep insight into the correlation between particle size and various optical characteristics as bandgap energy, absorption and emission features and the broadness of the emission signal. These structure-property relationships are only achieved due to the unique combination of different analytical techniques. Our study reveals that the removal of 10 wt% of smallest particles from the feed results in an enhancement of the emission signal. This improvement is ascribed to a decreased quenching of the emission in larger particles. Our results reveal the impact of PSDs on the properties and the performance of an ensemble of multicomponent QDs and anticipate the high potential of controlling PSDs by well-developed post-processing.
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Affiliation(s)
- T Akdas
- Institute of Particle Technology (LFG), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Cauerstr. 4, 91058 Erlangen, Germany.
| | - J Walter
- Institute of Particle Technology (LFG), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Cauerstr. 4, 91058 Erlangen, Germany.
| | - D Segets
- Institute of Particle Technology (LFG), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Cauerstr. 4, 91058 Erlangen, Germany.
| | - M Distaso
- Institute of Particle Technology (LFG), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Cauerstr. 4, 91058 Erlangen, Germany.
| | - B Winter
- Center for Nanoanalysis and Electron Microscopy (CENEM), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Cauerstr. 6, 91058 Erlangen, Germany
| | - B Birajdar
- Center for Nanoanalysis and Electron Microscopy (CENEM), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Cauerstr. 6, 91058 Erlangen, Germany
| | - E Spiecker
- Center for Nanoanalysis and Electron Microscopy (CENEM), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Cauerstr. 6, 91058 Erlangen, Germany
| | - W Peukert
- Institute of Particle Technology (LFG), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Cauerstr. 4, 91058 Erlangen, Germany.
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13
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Bashouti MY, Manshina A, Povolotckaia A, Povolotskiy A, Kireev A, Petrov Y, Mačković M, Spiecker E, Koshevoy I, Tunik S, Christiansen S. Direct laser writing of μ-chips based on hybrid C-Au-Ag nanoparticles for express analysis of hazardous and biological substances. Lab Chip 2015; 15:1742-1747. [PMID: 25673275 DOI: 10.1039/c4lc01376j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Micro-chips based on organic-inorganic hybrid nanoparticles (NPs) composed of nanoalloys of gold (Au) and silver (Ag) embedded in an amorphous carbonaceous matrix (C-Au-Ag NPs) were prepared directly on a substrate by the laser-induced deposition (for short: LID) method. The C-Au-Ag NPs show a unique plasmon resonance which enhances Raman scattering of analytes, making the μ-chips suitable to detect ultra-low-volumes (10(-12) liter) and concentrations (10(-9) M) of bio-agents and a hazardous compound. These micro-chips constitute a novel, flexible solid-state device that can be used for applications in point-of-care diagnostics, consumer electronics, homeland security and environmental monitoring.
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Affiliation(s)
- M Y Bashouti
- Max-Planck Institute for the Science of Light, Erlangen D-91058, Germany.
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14
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Paul J, Romeis S, Mačković M, Marthala V, Herre P, Przybilla T, Hartmann M, Spiecker E, Schmidt J, Peukert W. In situ cracking of silica beads in the SEM and TEM — Effect of particle size on structure–property correlations. POWDER TECHNOL 2015. [DOI: 10.1016/j.powtec.2014.10.026] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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15
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Landwehr J, Fader R, Rumler M, Rommel M, Bauer AJ, Frey L, Simon B, Fodor B, Petrik P, Schiener A, Winter B, Spiecker E. Optical polymers with tunable refractive index for nanoimprint technologies. Nanotechnology 2014; 25:505301. [PMID: 25427225 DOI: 10.1088/0957-4484/25/50/505301] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
In order to realize a versatile high throughput production of micro-optical elements, UV-curable polymer composites containing titanium dioxide nanoparticles were prepared and characterized. The composites are based on an industrial prototype epoxy polymer. Titanium dioxide nanoparticles smaller than 10 nm were synthesized by the nonaqueous sol method and in situ sterically stabilized by three different organic surfactants. The composites exhibit high transparency. Distinct alteration of optical transmission properties for visible light and near IR wavelength range could be avoided by adaption of the stabilizing organic surfactant. Most importantly, the refractive index (RI) of the composites that depends on the fraction of incorporated inorganic nanoparticles could be directly tuned. E.g. the RI at a wavelength of 635 nm of a composite containing 23 wt% titanium dioxide nanoparticles is increased to 1.626, with respect to a value of 1.542 for the pure polymer. Furthermore, it could be demonstrated that the prepared inorganic-organic nanocomposites are well suited for the direct fabrication of low-cost micro-optical elements by nanoimprint lithography. A low response of the optical composite properties to temperature treatment up to 220 °C with a shrinkage of only about 4% ensures its application for integrated micro-optical elements in industrial production.
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Affiliation(s)
- J Landwehr
- Fraunhofer Institute for Integrated Systems and Device Technology (IISB), Erlangen, 91058, Germany
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16
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Klaumünzer M, Weichsel U, Mačković M, Spiecker E, Peukert W, Kryschi C. Transmission Electron Microscopy and Time Resolved Optical Spectroscopy Study of the Electronic and Structural Interactions of ZnO Nanorods with Bovine Serum Albumin. J Phys Chem B 2013; 117:9683-9. [DOI: 10.1021/jp405181u] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- M. Klaumünzer
- Institute
of Particle Technology, Friedrich-Alexander-University Erlangen-Nuremberg,
Cauerstr. 4, 91058 Erlangen, Germany
| | - U. Weichsel
- Institute
of Particle Technology, Friedrich-Alexander-University Erlangen-Nuremberg,
Cauerstr. 4, 91058 Erlangen, Germany
| | - M. Mačković
- Center for Nanoanalysis and
Electron Microscopy (CENEM), Friedrich-Alexander-University Erlangen-Nuremberg, Cauerstr. 6, 91058 Erlangen, Germany
| | - E. Spiecker
- Center for Nanoanalysis and
Electron Microscopy (CENEM), Friedrich-Alexander-University Erlangen-Nuremberg, Cauerstr. 6, 91058 Erlangen, Germany
| | - W. Peukert
- Institute
of Particle Technology, Friedrich-Alexander-University Erlangen-Nuremberg,
Cauerstr. 4, 91058 Erlangen, Germany
| | - C. Kryschi
- Department of Chemistry and Pharmacy,
Institute of Physical Chemistry I and ICMM, Friedrich-Alexander-University Erlangen-Nuremberg, Egerlandstraße 3, 91058 Erlangen,
Germany
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17
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Garbrecht M, Spiecker E, Tillmann K, Jäger W. Quantitative atom column position analysis at the incommensurate interfaces of a (PbS)1.14NbS2 misfit layered compound with aberration-corrected HRTEM. Ultramicroscopy 2011; 111:245-50. [DOI: 10.1016/j.ultramic.2010.11.031] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2010] [Revised: 10/31/2010] [Accepted: 11/23/2010] [Indexed: 11/24/2022]
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Spiecker E, Schmid AK, Minor AM, Dahmen U, Hollensteiner S, Jäger W. Self-assembled nanofold network formation on layered crystal surfaces during metal intercalation. Phys Rev Lett 2006; 96:086401. [PMID: 16606202 DOI: 10.1103/physrevlett.96.086401] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2005] [Indexed: 05/08/2023]
Abstract
We study the formation of planar network nanostructures, which develop during metal deposition on initially smooth surfaces of layered compounds. Using in situ low-energy electron microscopy for dynamic observation and high-resolution transmission electron microscopy for structure analysis, we have observed the rapid formation of hexagonal networks of linear "nanofolds" with prismatic cavities on top of layered VSe2 crystals. Their formation results from relaxation of compressive strains which build up during Cu intercalation into a thin surface layer.
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Affiliation(s)
- E Spiecker
- National Center for Electron Microscopy, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
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Häussler D, Spiecker E, Yang S, Jäger W, Störmer M, Bormann R, Zwicker G. TEM characterization of La/B4C multilayer systems by the geometric phase method. ACTA ACUST UNITED AC 2005. [DOI: 10.1002/pssa.200521039] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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21
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Abstract
A new method for determining the polarity of crystals with sphalerite structure (GaAs, GaSb, InP, etc.) within the transmission electron microscope (TEM) is presented. The method is derived from an established convergent beam electron diffraction (CBED) method (J. Appl. Crystallogr. 15 (1982) 60) and exploits the effects of the dynamical scattering on the contrast of bend contour crossings in conventional TEM images. In contrast to the CBED method, the bend contour method is performed in the image mode of the TEM. The sample can, therefore, be viewed while performing the polarity analysis. Furthermore, in the presence of strong foil bending, the bend contour method has some advantages for practical work. A general contrast rule for the bend contour intersections is stated which allows to readily obtain the crystal polarity by comparing the contrast in experimental images with the prediction of the rule. Exemplarily, the polarity of GaAs in TEM samples prepared for investigation in the two frequently used projections < 001 > and < 110 > is determined. The validity of the rule for the cases studied is confirmed by simulations of the dynamical scattering process. Furthermore, an independent analysis of the crystal polarity by making use of a long-range-ordered (GaIn)P layer grown on top of the GaAs confirms the results obtained with the bend contour method. As an example, the usefulness of the method is demonstrated in an analysis of the alpha/beta-character of misfit dislocations at the interface between the GaAs substrate and the (GaIn)P layer.
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Affiliation(s)
- E Spiecker
- Mikrostrukturanalytik, Technische Fakultät der Christian-Albrechts-Universität zu Kiel, Germany
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Jäger C, Spiecker E, Morniroli JP, Jäger W. Polarity determination of III-V compound semiconductors by large-angle convergent beam electron diffraction. Ultramicroscopy 2002; 92:273-83. [PMID: 12213029 DOI: 10.1016/s0304-3991(02)00143-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The large-angle convergent beam electron diffraction (LACBED) technique is used for determining the crystal polarity of GaP and GaAs single crystals from < 1 1 0 > cross-sectional samples. The method which is based on an earlier approach using convergent beam electron diffraction (CBED) evaluates the polarity-sensitive contrast of high odd-index Bragg-lines in [0 0 2] dark-field patterns. The polarity is determined by application of a simple contrast rule as well as by direct comparison with dynamical simulations. For the two materials the ranges of applicability are determined by a detailed analysis of the Bragg-line contrast as a function of the sample thickness. The coexistence of the Bragg-line pattern and the of shadow image of the defect in correct rotational relationship to each other makes the analysis straightforward and free from possible sources of errors. As an example, the crystal polarity of GaP is related to the morphology of facetted voids. The LACBED method is shown to be suitable for relating the analysis of extended crystal defects. The advantages and the disadvantages of the LACBED method are discussed in comparison with the corresponding CBED method and with a recent method based on the analysis of bend contours.
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Affiliation(s)
- Ch Jäger
- Mikrostrukturanalytik, Technische Fakultät der Christian-Albrechts-Universität zu Kiel, Germany.
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