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Raczyńska ED, Kurpiewski J, Igielska M, Kamińska B. Quantitative description of bond lengths alternation for caffeine−effects of ionization, proton-transfer, and noncovalent interaction. COMPUT THEOR CHEM 2020. [DOI: 10.1016/j.comptc.2020.112811] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Liu J, Li M, Liu M, Cai H, Lin Y, Zhou Y, Huang Z, Lai F. The High Anisotropy of the Epitaxial Growth of the Well-Aligned Sb 2Se 3 Nanoribbons on Mica. ACS APPLIED MATERIALS & INTERFACES 2020; 12:9909-9917. [PMID: 32009379 DOI: 10.1021/acsami.9b20142] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
One-dimensional semiconductor nanostructures, which are different from those of bulk materials, have attracted considerable interest in either scientific research or practical application. Herein, the Sb2Se3 nanoribbons have been successfully synthesized by the epitaxial growth process on mica using the rapid physical vapor deposition method. The density of the Sb2Se3 nanoribbons increased quickly when the temperature decreased, and finally, the nanoribbons connected to each other and formed a network structure even in film. These nanoribbons were all well aligned along the preferred direction that either is parallel to each other or forms 60° angles. Further structural investigation demonstrated that the Sb2Se3 nanoribbons grew along the [001] directions, which are aligned along the directions [11̅0] and [100] or [100] and [110] on the mica surface. Then, an asymmetric lattice mismatch growth mechanism causing incommensurate heteroepitaxial lattice match between the Sb2Se3 and mica crystal structure was suggested. Furthermore, a polarized photodetector based on the film with the well-aligned Sb2Se3 nanoribbons was constructed, which illustrated strong photosensitivity and high anisotropic in-plane transport either in the dark or under light. The incommensurate heteroepitaxial growth method shown here may provide access to realize well-ordered nanostructures of other inorganic materials and promote the anisotropic photodetector industrialization.
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Affiliation(s)
- Jinyang Liu
- College of Physics and Energy , Fujian Normal University , Fuzhou 350117 , P. R. China
- Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials , Fuzhou 350117 , P. R. China
- Fujian Provincial Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices , Xiamen 361005 , P. R. China
- Fujian Provincial Engineering Technology Research Center of Solar Energy Conversion and Energy Storage , Fuzhou 350117 , China
| | - Mingling Li
- Hefei National Laboratory for Physical Science at the Microscale , University of Science and Technology of China , Hefei 230026 , Anhui , P. R. China
| | - Mengyu Liu
- College of Physics and Energy , Fujian Normal University , Fuzhou 350117 , P. R. China
| | - Hongbing Cai
- Hefei National Laboratory for Physical Science at the Microscale , University of Science and Technology of China , Hefei 230026 , Anhui , P. R. China
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences , Nanyang Technological University , Singapore 637371 , Singapore
| | - Yue Lin
- Hefei National Laboratory for Physical Science at the Microscale , University of Science and Technology of China , Hefei 230026 , Anhui , P. R. China
| | - Yuhan Zhou
- College of Physics and Energy , Fujian Normal University , Fuzhou 350117 , P. R. China
| | - Zhigao Huang
- College of Physics and Energy , Fujian Normal University , Fuzhou 350117 , P. R. China
- Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials , Fuzhou 350117 , P. R. China
- Fujian Provincial Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices , Xiamen 361005 , P. R. China
- Fujian Provincial Engineering Technology Research Center of Solar Energy Conversion and Energy Storage , Fuzhou 350117 , China
| | - Fachun Lai
- College of Physics and Energy , Fujian Normal University , Fuzhou 350117 , P. R. China
- Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials , Fuzhou 350117 , P. R. China
- Fujian Provincial Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices , Xiamen 361005 , P. R. China
- Fujian Provincial Engineering Technology Research Center of Solar Energy Conversion and Energy Storage , Fuzhou 350117 , China
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Schrode B, Pachmajer S, Dohr M, Röthel C, Domke J, Fritz T, Resel R, Werzer O. GIDVis: a comprehensive software tool for geometry-independent grazing-incidence X-ray diffraction data analysis and pole-figure calculations. J Appl Crystallogr 2019; 52:683-689. [PMID: 31236098 PMCID: PMC6557176 DOI: 10.1107/s1600576719004485] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Accepted: 04/02/2019] [Indexed: 11/10/2022] Open
Abstract
GIDVis is a software package based on MATLAB specialized for, but not limited to, the visualization and analysis of grazing-incidence thin-film X-ray diffraction data obtained during sample rotation around the surface normal. GIDVis allows the user to perform detector calibration, data stitching, intensity corrections, standard data evaluation (e.g. cuts and integrations along specific reciprocal-space directions), crystal phase analysis etc. To take full advantage of the measured data in the case of sample rotation, pole figures can easily be calculated from the experimental data for any value of the scattering angle covered. As an example, GIDVis is applied to phase analysis and the evaluation of the epitaxial alignment of pentacene-quinone crystallites on a single-crystalline Au(111) surface.
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Affiliation(s)
- Benedikt Schrode
- Institute of Solid State Physics, Graz University of Technology, Petersgasse 16, Graz 8010, Austria
| | - Stefan Pachmajer
- Institute of Solid State Physics, Graz University of Technology, Petersgasse 16, Graz 8010, Austria
| | - Michael Dohr
- Institute of Solid State Physics, Graz University of Technology, Petersgasse 16, Graz 8010, Austria
| | - Christian Röthel
- Institute of Pharmaceutical Sciences, Department of Pharmaceutical Technology, University of Graz, Universitätsplatz 1, Graz 8010, Austria
| | - Jari Domke
- Institute of Solid State Physics, Friedrich Schiller University Jena, Helmholtzweg 5, Jena 07743, Germany
| | - Torsten Fritz
- Institute of Solid State Physics, Friedrich Schiller University Jena, Helmholtzweg 5, Jena 07743, Germany
| | - Roland Resel
- Institute of Solid State Physics, Graz University of Technology, Petersgasse 16, Graz 8010, Austria
| | - Oliver Werzer
- Institute of Pharmaceutical Sciences, Department of Pharmaceutical Technology, University of Graz, Universitätsplatz 1, Graz 8010, Austria
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Trends in mica-mica adhesion reflect the influence of molecular details on long-range dispersion forces underlying aggregation and coalignment. Proc Natl Acad Sci U S A 2017; 114:7537-7542. [PMID: 28679632 DOI: 10.1073/pnas.1621186114] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Oriented attachment of nanocrystalline subunits is recognized as a common crystallization pathway that is closely related to formation of nanoparticle superlattices, mesocrystals, and other kinetically stabilized structures. Approaching particles have been observed to rotate to achieve coalignment while separated by nanometer-scale solvent layers. Little is known about the forces that drive coalignment, particularly in this "solvent-separated" regime. To obtain a mechanistic understanding of this process, we used atomic-force-microscopy-based dynamic force spectroscopy with tips fabricated from oriented mica to measure the adhesion forces between mica (001) surfaces in electrolyte solutions as a function of orientation, temperature, electrolyte type, and electrolyte concentration. The results reveal an ∼60° periodicity as well as a complex dependence on electrolyte concentration and temperature. A continuum model that considers the competition between electrostatic repulsion and van der Waals attraction, augmented by microscopic details that include surface separation, water structure, ion hydration, and charge regulation at the interface, qualitatively reproduces the observed trends and implies that dispersion forces are responsible for establishing coalignment in the solvent-separated state.
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Röthel C, Radziown M, Resel R, Grois A, Simbrunner C, Werzer O. Crystal alignment of caffeine deposited onto single crystal surfaces via hot-wall epitaxy. CrystEngComm 2017; 19:2936-2945. [PMID: 28670199 PMCID: PMC5471919 DOI: 10.1039/c7ce00515f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Accepted: 04/27/2017] [Indexed: 01/09/2023]
Abstract
Crystal growth of caffeine on single crystalline surfaces yields needle or bird-like shaped crystals depending on surface chemistry and symmetry.
Defined crystal growth is highly demanded for technological applications but also fundamental research. Within this work, the crystal growth of the asymmetric molecule caffeine was studied on single crystalline surfaces of muscovite mica, sodium chloride and potassium chloride. While elongated needle-like crystals grow on muscovite mica and sodium chloride, smaller individual “bird-like” structures were observed on potassium chloride. Depending on the surface type and temperature, the disk-shaped caffeine molecules prefer either an edge-on or flat-on orientation with respect to the surface, but in each case, a defined crystallographic relation between the surface and caffeine crystallites was determined by using the X-ray pole figure technique. On muscovite mica and sodium chloride, needle-like crystallites with edge-on oriented molecules aligned mainly with the unit cell c-axis (which coincides with the long needle axis) along the [1–10]mica, [100]mica, [110]mica and [110]NaCl, [1–10]NaCl directions, respectively. Crystals consisting of flat-on oriented molecules on KCl showed also defined alignments with respect to the substrate, but due to the altered molecule–substrate contact, the b-axis aligned along [110]KCl and [1–10]KCl. Growth at elevated temperatures enabled changes in the crystal growth whereby more defined structures formed on NaCl. On KCl, the bird-like structures remained very similar, while caffeine on the mica surface at elevated temperatures resulted in even additional texture forming with the caffeine molecules now also favoring a flat-on orientation with respect to the surface. The systematic variation of various system parameters demonstrates how sensitive the growth behavior of caffeine on this variety of substrates is.
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Affiliation(s)
- Christian Röthel
- Institute of Pharmaceutical Sciences , Department of Pharmaceutical Technology , Karl-Franzens Universität Graz , Universitätsplatz 1 , 8010 Graz , Austria . ; .,Institute of Solid State Physics , Graz University of Technology , Petersgasse 16 , 8010 Graz , Austria
| | - Michal Radziown
- Institute of Semiconductor and Solid State Physics , Johannes Kepler Universität Linz , Altenbergerstraße 69 , 4040 Linz , Austria
| | - Roland Resel
- Institute of Solid State Physics , Graz University of Technology , Petersgasse 16 , 8010 Graz , Austria.,BioTechMed - Graz , Austria
| | - Andreas Grois
- Institute of Solid State Physics , Graz University of Technology , Petersgasse 16 , 8010 Graz , Austria
| | - Clemens Simbrunner
- Institute of Solid State Physics , Graz University of Technology , Petersgasse 16 , 8010 Graz , Austria.,Institute of Solid State Physics , University of Bremen , Otto-Hahn-Allee 1 , 28359 Bremen , Germany
| | - Oliver Werzer
- Institute of Pharmaceutical Sciences , Department of Pharmaceutical Technology , Karl-Franzens Universität Graz , Universitätsplatz 1 , 8010 Graz , Austria . ; .,BioTechMed - Graz , Austria
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Christian P, Ehmann H, Coclite AM, Werzer O. Polymer Encapsulation of an Amorphous Pharmaceutical by initiated Chemical Vapor Deposition for Enhanced Stability. ACS APPLIED MATERIALS & INTERFACES 2016; 8:21177-84. [PMID: 27467099 PMCID: PMC4999961 DOI: 10.1021/acsami.6b06015] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2016] [Accepted: 07/28/2016] [Indexed: 05/22/2023]
Abstract
The usage of amorphous solids in practical applications, such as in medication, is commonly limited by the poor long-term stability of this state, because unwanted crystalline transitions occur. In this study, three different polymeric coatings are investigated for their ability to stabilize amorphous films of the model drug clotrimazole and to protect against thermally induced transitions. For this, drop cast films of clotrimazole are encapsulated by initiated chemical vapor deposition (iCVD), using perfluorodecyl acrylate (PFDA), hydroxyethyl methacrylate (HEMA), and methacrylic acid (MAA). The iCVD technique operates under solvent-free conditions at low temperatures, thus leaving the solid state of the encapsulated layer unaffected. Optical microscopy and X-ray diffraction data reveal that at ambient conditions of about 22 °C, any of these iCVD layers extends the lifetime of the amorphous state significantly. At higher temperatures (50 or 70 °C), the p-PFDA coating is unable to provide protection, while the p-HEMA and p-MAA strongly reduce the crystallization rate. Furthermore, p-HEMA and p-MAA selectively facilitate a preferential alignment of clotrimazole and, interestingly, even suppress crystallization upon a temporary, rapid temperature increase (3 °C/min, up to 150 °C). The results of this study demonstrate how a polymeric coating, synthesized directly on top of an amorphous phase, can act as a stabilizing agent against crystalline transitions, which makes this approach interesting for a variety of applications.
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Affiliation(s)
- Paul Christian
- Institute of Solid State Physics, NAWI Graz, Graz University of Technology, 8010 Graz, Austria
| | - Heike
M.A. Ehmann
- Institute of Pharmaceutical Science, Department of Pharmaceutical
Technology, University of Graz, 8010 Graz, Austria
| | - Anna Maria Coclite
- Institute of Solid State Physics, NAWI Graz, Graz University of Technology, 8010 Graz, Austria
| | - Oliver Werzer
- Institute of Pharmaceutical Science, Department of Pharmaceutical
Technology, University of Graz, 8010 Graz, Austria
- E-mail:
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