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Giant Second-Order Nonlinearity and Anisotropy of Large-Sized Few-Layer SnS with Ferroelectric Stacking

Advanced Optical materials 2024年第19期12卷

作者： Moqbel, Redhwan Nanae, Ryo Kitamura, Satsuki Lee, Ming-Hao Lan, Yann-Wen Lee, Chi-Cheng Nagashio, Kosuke Lin, Kung-Hsuan Department of Physics National Taiwan University No. 1 Sec. 4 Roosevelt Rd. Taipei106319 Taiwan Institute of Physics Academia Sinica No. 128 Sec. 2 Academia Rd. Nangang Dist. Taipei115201 Taiwan Nano-Science and Technology Program Taiwan International Graduate Program Academia Sinica No. 128 Sec. 2 Academia Rd. Nangang Dist. Taipei115201 Taiwan Department of Materials Engineering The University of Tokyo 7-3-1 Hongo Tokyo Bunkyo113-8656 Japan Center for Condensed Matter Sciences National Taiwan University Taipei10617 Taiwan The Key Consortium of Electron Microscopy National Taiwan University Taipei10617 Taiwan Department of Physics National Taiwan Normal University Taipei11677 Taiwan Department of Physics Tamkang University New Taipei Tamsui251301 Taiwan

The giant second-order nonlinearity of SnS with ferroelectric stacking is reported. Based on theoretical calculations, the susceptibility of second harmonic generation (SHG) from SnS with ferroelectric stacking is up to 1354 pm V−1, which is three orders of magnitude higher than the values of traditional nonlinear crystals such as BBO and KTP. The SHG from ferroelectric SnS few layers is experimentally measured and its intensity is found to be 131 times larger than that of a MoS2 monolayer under the same experimental conditions, with a photon energy of 1.55 eV. The SHG susceptibility is determined to be on the order of 100 pm V−1. Numerous SnS flakes are systematically investigated using polarization-resolved SHG. Micrometer-sized flakes with a single domain are found, and their SHG anisotropic patterns fit well with the theoretical calculations derived from first-principles methods. The variation in SHG anisotropic patterns, attributed to SHG interference from multiple domains, is investigated both theoretically and experimentally. Additionally, the impact of stacking disorder on the SHG anisotropic pattern is explored. It is demonstrated that polarization-resolved SHG microscopy is a valuable tool for identifying domains in SnS flakes and examining stacking disorder. © 2024 Wiley-VCH GmbH.

关键词： Harmonic generation

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Hexaazatriphenylene-Based Two-Dimensional Conductive Covalent Organic Framework with Anisotropic Charge Transfer

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Angewandte Chemie 2023年第42期135卷

作者： Seong-Wook Kim Hyeonjung Jung Dr. Mahmut Sait Okyay Dr. Hyuk-Jun Noh Sein Chung Young Hyun Kim Jong-Pil Jeon Prof. Dr. Bryan M. Wong Prof. Dr. Kilwon Cho Dr. Jeong-Min Seo Prof. Dr. Jung-Woo Yoo Prof. Dr. Jong-Beom Baek Department of Energy and Chemical Engineering/ Center for Dimension-Controllable Organic Frameworks Ulsan National Institute of Science and Technology (UNIST) Ulsan 44919 Republic of Korea These authors contributed equally to this work School of Materials Science and Engineering Ulsan National Institute of Science and Technology (UNIST) Ulsan 44919 Republic of Korea Materials Science & Engineering Program Department of Chemistry and Department of Physics & Astronomy University of California-Riverside Riverside CA 92521 USA Department of Chemistry Dartmouth College Hanover NH 03755 USA Department of Chemical Engineering Pohang University of Science and Technology Pohang 37673 Republic of Korea School of Materials Science and Engineering/ Graduate School of Semiconductor Materials and Devices Ulsan National Institute of Science and Technology (UNIST) Ulsan 44919 Republic of Korea

The development of covalent organic frameworks (COFs) with efficient charge transport is of immense interest for applications in optoelectronic devices. To enhance COF charge transport properties, electroactive building blocks and dopants can be used to induce extended conduction channels. However, understanding their intricate interplay remains challenging. We designed and synthesized a tailor-made COF structure with electroactive hexaazatriphenylene (HAT) core units and planar dioxin (D) linkages, denoted as HD-COF. With the support of theoretical calculations, we found that the HAT units in the HD-COF induce strong, eclipsed π–π stacking. The unique stacking of HAT units and the weak in-plane conjugation of dioxin linkages leads to efficient anisotropic charge transport. We fabricated HD-COF films to minimize the grain boundary effect of bulk COFs, which resulted in enhanced conductivity. As a result, the HD-COF films showed an electrical conductivity as high as 1.25 S cm −1 after doping with tris(4-bromophenyl)ammoniumyl hexachloroantimonate.

关键词： Anisotropic Charge Transfer Conductivity Covalent Organic Frameworks Doping

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Unraveling the Cr 2 N Precipitation and Its Negative Effect on the Corrosion Resistance of Friction Stir Welded UNS S32760 Super Duplex Stainless Steel

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Surfaces and Interfaces 2025年 71卷

作者： G.S. Vacchi W.S. de Carvalho C.P. Meinhardt L.A. Bergmann S.T. Amancio-Filho C.A.D. Rovere Munir Rachid Corrosion Laboratory Department of Materials Engineering Federal University of São Carlos Rodovia Washington Luis Km 235 São Carlos SP 13565-905 Brazil Graduate Program in Materials Science and Engineering Federal University of São Carlos Brazil Institute of Materials Science Joining and Forming BMK Endowed Professorship for Aviation Graz University of Technology – TU Graz Kopernikusgasse 24/1 Graz 8010 Austria Department of Mechanical Engineering Federal University of Pampa Avenida Tiarajú 810 Alegrete RS Brazil Helmholtz-Zentrum Hereon Institute of Materials Mechanics Solid State Materials Processing Max-Planck-Straße 1 Geesthacht Germany

The root surface of a friction stir welded super duplex stainless steel (UNS S32760) was thoroughly characterized in this study. The findings revealed a refined grain structure and a conspicuous increase of 50 HV 0.3 in the Root’s hardness. Interestingly, the volume fraction of the ferrite phase remained largely unchanged. Rapid cooling in the welding process led to the Cr 2 N precipitation at the ferrite/ferrite grain boundaries in the root area, significantly increasing sensitization, reducing localized corrosion resistance under high electrode potentials in a neutral pH saline environment, and adversely affecting root passivity in a hydrochloric acid environment compared to the base metal.

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Correction: A review of Gum Metal: Developments over the years and new perspectives

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Journal of materials Research 2023年第1期38卷 265-265页

作者： da Silva, Murillo Romero Plaine, Athos Henrique Pinotti, Vitor Eduardo Mazzer, Eric Marchezini Bolfarini, Claudemiro School of Metallurgical Industrial Engineering of Volta Redonda Federal Fluminense University Volta Redonda Brazil Department of Mechanical Engineering State University of Santa Catarina - UDESC Joinville Brazil Graduate Program in Materials Science and Engineering Federal University of São Carlos São Carlos Brazil Department of Metallurgical and Materials Engineering Federal University of Minas Gerais Belo Horizonte Brazil Department of Materials Engineering Federal University of São Carlos São Carlos Brazil

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Diversification of the Carbodicarbene Class by Embedding an Anionic Component in its Scaffold

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Chemistry - A European Journal 2023年第71期29卷 e202302886页

作者： Yu, Cheng-Han Au-Yeung, Ka-Chun Liu, Ruiqin Lee, Chao-Hsien Jiang, Dandan Semagne Aweke, Bamlaku Wu, Chia-Hung Wang, Yu-Jou Wang, Ting-Hsuan Voon Kong, Kien Yap, Glenn P. A. Chen, Wen-Ching Frenking, Gernot Zhao, Lili Ong, Tiow-Gan Institute of chemistry Academia Sinica Taipei115201 Taiwan School of Chemistry and Molecular Engineering State Key Laboratory of Materials-Oriented Chemical Engineering Nanjing Tech University Nanjing China Fachbereich Chemie Philipps-Universität Marburg Hans-Meerwein-Strasse MarburgD-35043 Germany Department of Chemistry and Biochemistry University of Delaware NewarkDE United States Department of Chemistry National Taiwan University Taipei Taiwan Department of Applied Chemistry National Yang Ming Chiao Tung University Hsinchu Taiwan Sustainable Chemical Science and Technology Taiwan International Graduate Program Academia Sinica Taipei Taiwan Corporate R&D Center LCY Chemical Corporation Kaohsiung Taiwan Department of Medicinal and Applied Chemistry Kaohsiung Medical University Kaohsiung Taiwan

Carbodicarbene (CDC) has become an emerging ligand in many fields due to its strong σ-donating ability. 2- moiety within the framework to leverage the electronic feature of carbon carbone. The elucidation of X-ray crystal structures, ligand competition as well as transmetallation experiments suggest that the anionic moiety has enhanced the overall donor strength of the traditional neutral CDC. Importantly, this anionic scaffold exhibits a facile second coordination toward Au(I), Ag(I) and Pd(II) without any external ligand assistance, whereas previously reported neutral pincer CDC complexes do not possess a two-fold donor capacity. The analysis of the bonding situation via theoretical methods shows that the description of the anionic CDC moieties in terms of dative bonding is preferred over the model of delocalized positive charge, as it accounts for the two-fold donor ability of the divalent carbon atom, preserving a characteristic feature of a carbone. © 2023 Wiley-VCH GmbH.

关键词： Scaffolds

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Bispropylurea bridged polysilsesquioxane: A microporous MOF-like material for molecular recognition

arXiv

引用

arXiv 2021年

作者： Doustkhah, Esmail Tahawy, Rafat Simon, Ulla Tsunoji, Nao Ide, Yusuke Hanaor, Dorian A.H. Hussein N. Assadi, M. 1-1 Namiki Tsukuba Ibaraki305-0044 Japan Fachgebiet Keramische Werkstoffe Technische Universität Berlin Berlin10623 Germany Graduate School of Advanced Science and Engineering Applied Chemistry Program Hiroshima University 1-4-1 Kagamiyama Higashi-Hiroshima739-8527 Japan School of Materials Science and Engineering The University of New South Wales SydneyNSW2052 Australia

Microporous organosilicas assembled from polysilsesquioxane (POSS) building blocks are promising materials that are yet to be explored in-depth. Here, we investigate the processing and molecular structure of bispropylurea bridged POSS (POSS-urea), synthesised through the acidic condensation of 1,3-bis(3-(triethoxysilyl)propyl)urea (BTPU). Experimentally, we show that POSS-urea has excellent functionality for molecular recognition toward acetonitrile with an adsorption level of 74 mmol/g, which compares favourably to MOFs and zeolites, with applications in volatile organic compounds (VOC). The acetonitrile adsorption capacity was 132-fold higher relative to adsorption capacity for toluene, which shows the pores are highly selective towards acetonitrile adsorption due to their size and arrangement. Theoretically, our tight-binding density functional and molecular dynamics calculations demonstrated that this BTPU based POSS is microporous with an irregular placement of the pores. Structural studies confirm maximal pore sizes of ~ 1 nm, with POSS cages possessing an approximate edge length of ~ 3.16 Å. © 2021, CC BY.

关键词： Urea

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High-performance Removal of Anti-inflammatory Using Activated Carbon from Water Treatment Plant Sludge: Fixed-bed and Batch Studies

Research Square

引用

Research Square 2021年

作者： Filho, Alaor Valério Tholozan, Luana Vaz Arim, Aline Lemos de Almeida, André Ricardo Felkl da Rosa, Gabriela Silveira Graduate Program in Science and Engineering of Materials Federal University of Pampa 1650 Maria Anunciação Gomes Godoy Avenue Rio Grande do Sul Bagé96413-172 Brazil Chemical Engineering Federal University of Pampa 1650 Maria Anunciação Gomes Godoy Avenue Rio Grande do Sul Bagé96413-172 Brazil

Activated carbon from water treatment sludge (WASC) was employed as adsorbent material to remove the anti-inflammatory Nimesulide (NM) from aqueous solutions. NM adsorption was performed in batch and fixed-bed systems, evaluating pH, adsorbent dosage, adsorption kinetics, equilibrium isotherm, continuous adsorption, and simulated effluents. The kinetic data were best fitted to the Elovich model and Intraparticle diffusion reaching the equilibrium at 120 min. Langmuir model presented a better description of the equilibrium data with the maximum adsorption capacity (qmax) of 274.99 mg g-1 from NM adsorption by WASC. The adsorbent was tested in two simulated hospital effluents and proved to be an excellent adsorbent for removing NM from an aqueous solution with the presence of salts, sugars, and other inorganics. Finally, WASC was applied in fixed-bed NM adsorption obtaining the adsorption capacity of 217.28 mg g-1 © 2021, CC BY.

关键词： Adsorption

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Identifying topologically associating domains using differential kernels

arXiv

引用

arXiv 2023年

作者： Maisuradze, Luka King, Megan C. Surovtsev, Ivan V. Mochrie, Simon G.J. Shattuck, Mark D. O’Hern, Corey S. Department of Molecular Biophysics and Biochemistry Yale University New HavenCT United States Department of Cell Biology Yale School of Medicine New HavenCT United States Department of Physics Yale University New HavenCT United States Benjamin Levich Institute Physics Department The City College of New York New YorkNY United States Department of Mechanical Engineering and Materials Science Yale University New HavenCT United States Graduate Program in Computational Biology and Bioinformatics Yale University New HavenCT United States

Chromatin is a polymer complex of DNA and proteins that regulates gene expression. The three-dimensional (3D) structure and organization of chromatin controls DNA transcription and replication. High-throughput chromatin conformation capture techniques generate Hi-C maps that can provide insight into the 3D structure of chromatin. Hi-C maps can be represented as a symmetric matrix Aij, where each element represents the average contact probability or number of contacts between chromatin loci i and j. Previous studies have detected topologically associating domains (TADs), or self-interacting regions in Aij within which the contact probability is greater than that outside the region. Many algorithms have been developed to identify TADs within Hi-C maps. However, most TAD identification algorithms are unable to identify nested or overlapping TADs and for a given Hi-C map there is significant variation in the location and number of TADs identified by different methods. We develop a novel method to identify TADs, KerTAD, using a kernel-based technique from computer vision and image processing that is able to accurately identify nested and overlapping TADs. We benchmark this method against state-of-the-art TAD identification methods on both synthetic and experimental data sets. We find that the new method consistently has higher true positive rates (TPR) and lower false discovery rates (FDR) than all tested methods for both synthetic and manually annotated experimental Hi-C maps. The TPR for KerTAD is also largely insensitive to increasing noise and sparsity, in contrast to the other methods. We also find that KerTAD is consistent in the number and size of TADs identified across replicate experimental Hi-C maps for several organisms. Thus, KerTAD will improve automated TAD identification and enable researchers to better correlate changes in TADs to biological phenomena, such as enhancer-promoter interactions and disease states. © 2023, CC BY.

关键词： Topology

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Ultrastrong Spin-Photon Coupling in Gadolinium Gallium Garnet

Ultrastrong Spin-Photon Coupling in Gadolinium Gallium Garne...

引用

Conference on Lasers and Electro-Optics (CLEO)

作者： T. Elijah Kritzell Junzhe Bao Jacques Doumani Jae Joon Lee Hongjing Xu Fuyang Tay Hiroyuki Nojiri Motoaki Bamba Andrey Baydin Junichiro Kono Department of Electrical and Computer Engineering Rice University Houston Texas USA Applied Physics Graduate Program Smalley-Curl Institute Rice University Houston Texas USA Department of Physics and Astronomy Rice University Houston Texas USA Institute for Materials Research Tohoku University Senai Japan The Hakubi Center for Advanced Research Kyoto University Kyoto Japan Department of Physics I Kyoto University Kyoto Japan Smalley-Curl Institute Rice University Houston Texas USA Department of Material Science and NanoEngineering Rice University Houston Texas USA

We examine ultrastrong coupling of an ensemble of paramagnetic spins in Gd 3 Ga 5 O 12 with terahertz photons in the presence of a high external magnetic field both in the bulk and thin-film limits.

ISBN: (纸本)9781957171258

We examine ultrastrong coupling of an ensemble of paramagnetic spins in Gd 3 Ga 5 O 12 with terahertz photons in the presence of a high external magnetic field both in the bulk and thin-film limits.

关键词： CCD cameras Condensed matter Magnetic fields Photons Quantum optics Terahertz spectroscopy

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Deformed Fredkin model for the ν=5/2 Moore-Read state on thin cylinders

arXiv

引用

arXiv 2023年

作者： Voinea, Cristian Pu, Songyang Kirmani, Ammar Ghaemi, Pouyan Rahmani, Armin Papić, Zlatko School of Physics and Astronomy University of Leeds LeedsLS2 9JT United Kingdom Theoretical Division T-4 Los Alamos National Laboratory Los AlamosNM87545 United States Physics Department City College of the City University of New York NY10031 United States Physics Program Graduate Center of City University of New York NY10031 United States Department of Physics and Astronomy Advanced Materials Science and Engineering Center Western Washington University BellinghamWA98225 United States

We propose a frustration-free model for the Moore-Read quantum Hall state on sufficiently thin cylinders with circumferences 7 magnetic lengths. While the Moore-Read Hamiltonian involves complicated long-range interactions between triplets of electrons in a Landau level, our effective model is a simpler one-dimensional chain of qubits with deformed Fredkin gates. We show that the ground state of the Fredkin model has high overlap with the Moore-Read wave function and accurately reproduces the latter’s entanglement properties. Moreover, we demonstrate that the model captures the dynamical response of the Moore-Read state to a geometric quench, induced by suddenly changing the anisotropy of the system. We elucidate the underlying mechanism of the quench dynamics and show that it coincides with the linearized bimetric field theory. The minimal model introduced here can be directly implemented as a first step towards quantum simulation of the Moore-Read state, as we demonstrate by deriving an efficient circuit approximation to the ground state and implementing it on IBM quantum processor. © 2023, CC BY.

关键词： Ground state

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