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Magnetism-induced second-order nonlinear optical responses in multiferroic BiFeO3

Physical Review B 2024年第1期110卷 014422-014422页

作者： Babu Baijnath Prasad Guan-Fu Liu Guang-Yu Guo Department of Physics and Center for Theoretical Physics Nano Science and Technology Program Taiwan International Graduate Program Physics Division

Nonlinear optical (NLO) responses of noncentrosymmetric nonmagnets have drawn a lot of attention in the past decades because of their significance in materials characterization, green energy, and device applications. On the other hand, magnetism not only can break the inversion symmetry in centrosymmetric crystals but also introduce additional NLO phenomena in noncentrosymmetric materials, thus enabling the magnetic field control of light-matter interactions. However, the magnetism-induced NLO responses have rarely been studied so far. In this paper, we study the magnetism-induced NLO responses of multiferroic bismuth ferrite (BiFeO3) based on density-functional-theory calculations. First, we find that the calculated magnetism-induced second-harmonic generation (SHG) susceptibilities are large and the SHG intensity is tunable with the reversal of magnetization. In particular, the interference between crystallographic SHG and magnetically induced SHG components results in a strong magnetic contrast of the SHG signal of ∼440% at SHG photon energy of 4.82 eV, thus enabling a magnetic control of the SHG in multiferroic BiFeO3. Also, because of the sensitivity of the SHG signal to the direction of the Néel vector, the SHG can be utilized to detect the reversal of the Néel vector in the AFM materials, which is an important issue for AFM spintronics. Second, the calculated bulk photovoltaic effects (BPVE) in BiFeO3 are also strong, being larger than some well-known NLO compounds such as BaTiO3, GaAs, CdS, and CdSe. Finally, we analyze the origins of the prominent features in the NLO response spectra in terms of the calculated quantum geometric quantities. Our interesting findings suggest that the magnetism-driven NLO responses in BiFeO3 are significant, anisotropic, and tunable and that understanding the magnetism-driven components of both SHG and BPVE is essential for their applications in, e.g., multiferroic-based photovoltaic devices and second-harmonic generation.

关键词： Antiferromagnetism Electronic structure Nonlinear optical susceptibility Photogalvanic effect Second order nonlinear optical processes Antiferromagnets Magnetic semiconductors Multiferroics Density functional theory First-principles calculations

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2D Heterostructures Induced Charge Transfer and Trapping for Hybrid Optically and Electrically Controllable Nonvolatile Memory

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Advanced Optical Materials 2024年第4期12卷

作者： Li, Sin-En Lu, Guan-Zhang Shen, Ji-Lin Wu, Meng-Jer Chen, Yu-Ting Mustaqeem, Mujahid Chen, Yang-Fang Department of Physics National Taiwan University Taipei10617 Taiwan Advanced Research Center for Green Materials Science and Technology National Taiwan University Taipei10617 Taiwan Department of Physics and Center for Nanotechnology Chung Yuan Christian University Chung-Li32023 Taiwan Department of Optoelectric Physics Chinese Culture University Taipei11114 Taiwan Department of Chemistry National Taiwan University Taipei10617 Taiwan Nano-Science and Technology Program Taiwan International Graduate Program Institute of Physics Academia Sinica Taipei10617 Taiwan

Nonvolatile memory is an indispensable component of electronic devices. However, the current technology makes it difficult to satisfy the emerging big data demand. To circumvent the existing problems, herein, a first attempt is made to achieve multifunctional nonvolatile memory based on all 2D heterostructures, consisting of histidine-doped molybdenum disulfide quantum disks mixed with graphene oxide and a graphene macroscopic heterojunction. The designed device possesses intriguing hybrid electrically and optically controllable nonvolatile memory functionalities. By harnessing the unique properties of these materials, memory devices demonstrate long-term stability and nonvolatile characteristics under both optical and electrical control signals. These devices possess outstanding features, such as multiple read-write cycles, multi levels, and fast switching speeds, overcoming the limitations of traditional components. To explore the underlying physical mechanism, the Fermi level of graphene is measured and it is confirmed that the charge transfer and trapping across the heterojunctions are the major factors responsible for the observed behavior. This study demonstrates that 2D heterostructures for hybrid optically and electrically controllable nonvolatile memory pave an alternative route for the next-generation information technology. © 2023 Wiley-VCH GmbH.

关键词： Charge transfer

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From food toxins to biomarkers: Multiplexed detection of aflatoxin B1 and aflatoxin M1 in milk and human serum using PEGylated ternary transition metal sulfides

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Sensors and Actuators Reports 2023年 5卷

作者： Yadav, Kanchan Moovendaran, Kalimuthu Dhenadhayalan, Namasivayam Lee, Shang-Fan Leung, Man-Kit Sankar, Raman Department of Chemistry National Taiwan University No. 1 Sec. 4 Roosevelt Road Taipei106 Taiwan Nano Science and Technology Program Taiwan International Graduate Program Academia Sinica and National Taiwan University Taipei Taiwan Institute of Physics Academia Sinica Taipei11529 Taiwan

Aflatoxins (AF) are fungal toxins which not only contaminate food, but also adversely impact human health if consumed and serve as biomarkers for deadly diseases like liver cancer. Therefore, there is a strong need to develop ultra-sensitive AF detection method in physiological environments. In the present study, ternary transition metal sulfides single crystals (Mn0.02Ta3S6 and Fe0.65Ta3S6) were grown, exfoliated to thin layered nanosheets (NSs) followed by polyethylene-glycol modification (PEG@NSs). High fluorescence quenching abilities towards the aptamers for AF biosensing were demonstrated using PEGylated NSs. It has been observed that PEGylated NSs improves the detection sensitivity ∼ 248 times better than non-PEGylated NSs. Subsequently, multiplexed detections of aflatoxin B1 (AFB1) and M1 (AFM1) in diverse mediums including PBS buffer (1 ×), milk and human serum were performed by employing PEG@Mn0.02Ta3S6 NSs with TAMRA dye-labelled AFB1 aptamer and FAM dye-labelled AFM1 aptamer, respectively. The fluorescence intensity of designed sensor exhibited ultrasensitive detections (∼ pM) and a wide linear range (≥ 5 orders). Hence, the present study can serve as a unique platform for facile, ultra-sensitive, selective, cost-effective and quick multiplexed detection of food toxins and disease biomarkers in complex-matrix. © 2023

关键词： Polyethylene glycols

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Comprehensive Neurotoxicity of Lead Halide Perovskite nanocrystals in Nematode Caenorhabditis elegans

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Small 2024年第2期20卷 2306020-2306020页

作者： Ngo, Loan Thi Huang, Wen-Tse Chan, Ming-Hsien Su, Ting-Yi Li, Chien-Hsiu Hsiao, Michael Liu, Ru-Shi Department of Chemistry National Taiwan University Taipei106 Taiwan Nano Science and Technology Program Taiwan International Graduate Program Academia Sinica and National Taiwan University Academia Road 128 Nankang Taipei115 Taiwan Genomics Research Center Academia Sinica Academia Road 128 Nankang Taipei115 Taiwan Department of Biomedical Imaging and Radiological Sciences National Yang Ming Chiao Tung University Taipei112 Taiwan

To date, all-inorganic lead halide perovskite quantum dots have emerged as promising materials for photonic, optoelectronic devices, and biological applications, especially in solar cells, raising numerous concerns about their biosafety. Most of the studies related to the toxicity of perovskite quantum dots (PeQDs) have focused on the potential risks of hybrid perovskites by using zebrafish or human cells. So far, the neurotoxic effects and fundamental mechanisms of PeQDs remain unknown. Herein, a comprehensive methodology is designed to investigate the neurotoxicity of PeQDs by using Caenorhabditis elegans as a model organism. The results show that the accumulation of PeQDs mainly focuses on the alimentary system and head region. Acute exposure to PeQDs results in a decrease in locomotor behaviors and pharyngeal pumping, whereas chronic exposure to PeQDs causes brood decline and shortens lifespan. In addition, some abnormal issues occur in the uterus during reproduction assays, such as vulva protrusion, impaired eggs left in the vulva, and egg hatching inside the mother. Excessive reactive oxygen species formation is also observed. The neurotoxicity of PeQDs is explained by gene expression. This study provides a complete insight into the neurotoxicity of PeQD and encourages the development of novel nontoxic PeQDs. © 2023 Wiley-VCH GmbH.

关键词： Toxicity

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Folding Graphene into Super-Strong, Z-Laminated Membranes

SSRN

引用

SSRN 2023年

作者： Santos, Ian Daniell Hofmann, Mario Tjarks, Patrick Muthu, Jeyavelan Lin, You-Chen Yen, Zhi-Long Chand, Pradyumna Kumar Raman, Radha Rouhani, Mehdi Jeng, Yeau-Ren Nguyen, Dinh-Tuan Hsieh, Ya-Ping Department of Physics National Taiwan University Taipei106 Taiwan Nano Science and Technology Program Taiwan International Graduate Program Academia Sinica National Taiwan University Taiwan Institute of Physics Academia Sinica Taipei106 Taiwan Institute for Atomic and Molecular Sciences Academia Sinica Taipei106 Taiwan Department of Chemistry National Taiwan University Taipei106 Taiwan Department of Physics National Central University Taoyuan320 Taiwan Molecular Science and Technology Program Taiwan International Graduate Program Academia Sinica National Central University Taiwan Department of Materials Science and Engineering National Cheng Kung University Tainan70101 Taiwan

We here demonstrate the strengthening of graphene, an atomically thin carbon allotrope, by out-of-plane folding. Through lateral confinement of graphene at the water-air interface, buckling was induced in suspended flakes leading to an unexpected folding transition beyond a critical surface pressure. The emergence of folding was confirmed by in-situ reflectivity and ex-situ microscopy and imparts graphene assemblies with a unique "z-laminated" morphology. Molecular dynamics simulations indicate an enhanced adhesion between neighboring flakes compared to lateral sliding which was confirmed by a surface pressure hysteresis during the folding process. Mechanical testing reveals superior Young’s modulus and Yield strength when compared to conventional graphene assemblies and even compared to composites. We demonstrate the potential of folding for graphene-based structural materials, tribological layers, and functional electrochemical coatings. Finally, the complete recyclability of z-laminated graphene opens up new routes towards sustainable nanostructured materials. © 2023, The Authors. All rights reserved.

关键词： Graphene

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Helicity-tunable spin Hall and spin Nernst effects in unconventional chiral fermion semimetals XY (X=Co, Rh;Y=Si, Ge)

arXiv

引用

arXiv 2022年

作者： Hsieh, Ting-Yun Prasad, Babu Baijnath Guo, Guang-Yu Department of Physics National Taiwan University Taipei10617 Taiwan Nano Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei11529 Taiwan Physics Division National Center for Theoretical Sciences Taipei10617 Taiwan

Transition metal monosilicides CoSi, CoGe, RhSi and RhGe in the chiral cubic B20 structure (the CoSi family) have recently been found to host unconventional chiral fermions beyond spin-1/2 Weyl fermions, and also to exhibit exotic physical phenomena such as long Fermi arc surface states, gyrotropic magnetic effect and quantized circular photogalvanic effect. Thus, exploring novel spin-related transports in these unconventional chiral fermion semimetals may open a new door for spintronics and spin caloritronics. In this paper, we study the intrinsic spin Hall effect (SHE) and spin Nernst effect (SNE) in the CoSi family based on ab initio relativistic band structure calculations. First, we find that unlike nonchiral cubic metals, the CoSi family have two independent nonzero spin Hall (Nernst) conductivity tensor elements, namely, σxyz and σxzy (αzxy and αyxz) instead of one element. Furthermore, the SHC (σxyz and σxzy ) and helicity of the chiral structure are found to be correlated, thus enabling SHE detection of structural helicity and also chiral fermion chirality. Second, the intrinsic SHE and SNE in some of the CoSi family are large. In particular, the calculated spin Hall conductivity (SHC) of RhGe is as large as -140 (~/e)(S/cm). The calculated spin Nernst conductivity (SNC) of CoGe is also large, being -1.3 (~/e)(A/m K) at room temperature. Due to their semimetallic nature with low electrical conductivity, these topological semimetals may have large spin Hall and spin Nernst angles, being comparable to that of platinum metal. The SHC and SNC of these compounds can also be increased by raising or lowering chemical potential to, e.g., the topological nodes, via either chemical doping or electrical gating. Our findings thus indicate that transition metal monosilicides of the CoSi family not only would provide a material platform for exploring novel spin-transports and exotic phenomena in unconventional chiral fermion semimetals but also could be promising materia

关键词： Calculations

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Corrigendum to "Effect of cell imprinting on viability and drug susceptibility of breast cancer cells to doxorubicin" [Acta Biomaterialia, 2020, 113, 119-129] (Acta Biomaterialia (2020) 113 (119–129), (S1742706120303287), (10.1016/***.2020.06.007))

引用

Acta Biomaterialia 2025年 198卷 571-572页

作者： Shahriyari, Fatemeh Janmaleki, Mohsen Sharifi, Shahriar Hesar, Milad Eyvazi Hoshian, Sasha Taghiabadi, Reza Razaghian, Ahmad Ghadiri, Majid Peirovi, Afshin Mahmoudi, Morteza Nezhad, Amir Sanati Khademhosseini, Ali Division of Engineering in Medicine Department of Medicine Brigham and Women's Hospital Harvard Medical School CambridgeMA United States Division of Health Sciences & Technology Harvard-Massachusetts Institute of Technology Massachusetts Institute of Technology CambridgeMA United States Department of Materials Engineering Faculty of Engineering Imam Khomeini International University Qazvin Iran Biomedical Engineering Graduate Program University of Calgary Canada Precision Health Program and Department of Radiology Michigan State University East LansingMI48824 United States RWTH Aachen University Templergraben 55 Aachen52062 Germany Department of Chemistry and Materials Science Aalto University School of Chemical Engineering Espoo Finland Department of Mechanical Engineering Faculty of Engineering Imam Khomeini International University Qazvin Iran Nano-Biotechnology Department Pasteur Institute of Iran Tehran Iran Departments of Bioengineering Chemical and Biomolecular Engineering and Radiological Sciences Center for Minimally Invasive Therapeutics California NanoSystems Institute University of California – Los Angeles Los AngelesCA United States Terasaki Institute for Biomedical Innovation Los AngelesCA United States

The authors regret to report that the images for panels h (Plain PDMS) and I (MCF7-imprinted PDMS) in Fig. 3 were mistakenly taken from the same dataset, resulting in the omission of the correct image in panel h for the Plain PDMS day 7 image. We sincerely apologize for this error. For an accurate representation, please see the corrected Fig. 3 provided here along with its original figure caption. This does not affect the validity of the statistical analyses or the overall conclusions drawn from the study. © 2025

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Amino-functionalized reduced graphene oxide@MoS2@CoS2 heterostructure as a high-rate anode material for ultralong lifespan sodium–sulfur batteries

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New Journal of Chemistry 2025年第24期49卷 10379-10387页

作者： Navid Aslfattahi Maryam Sadat Kiai Nilgun Baydogan Lingenthiran Samylingam Kumaran Kadirgama Chee Kuang Kok Department of Fluid Dynamics and Thermodynamics Faculty of Mechanical Engineering Czech Technical University in Prague Prague 166 07 Czech Republic Nano-Science and Nano-Engineering Program Graduate School of Science Engineering and Technology Istanbul Technical University Istanbul-34469 Turkey Energy Institute Ayazaga Campus Istanbul Technical University Maslak Istanbul Turkey Centre for Advanced Mechanical and Green Technology Center of Excellence for Robotics & Sensing Technologies Faculty of Engineering and Technology Multimedia University Jalan Ayer Keroh Lama Bukit Beruang 75450 Melaka Malaysia Faculty of Mechanical and Automotive Engineering Technology Universiti Malaysia Pahang 26600 Pekan Malaysia Centre for Research in Advanced Fluid and Process University Malaysia Pahang Al-Sultan Abdullah Lebuhraya Tun Razak Gambang Kuantan Pahang Malaysia Centre for Sustainable Materials & Surface Metamorphosis (CSMSM) Chennai Institute of Technology Chennai India

A nanocomposite comprising MoS2@CoS2 amino-functionalized graphene (En-RGO) with a two-dimensional structure has been successfully synthesized using a simple self-assembly technique. The resulting cell with a MoS2@CoS...

A nanocomposite comprising MoS₂@CoS₂ amino-functionalized graphene (En-RGO) with a two-dimensional structure has been successfully synthesized using a simple self-assembly technique. The resulting cell with a MoS₂@CoS₂@En-RGO anode and a sulfur cathode exhibits a superior hierarchical architecture that significantly facilitates ion mobility, cell conductivity, and pseudocapacitance. Consequently, this leads to improved rate performance and extended cycle stability in Na–S batteries. Micron-sized CoS₂ was synthesized by solvothermal growth of MoS₂ nanosheets on its surface. This composite material presents enhanced sodium-ion diffusion kinetics attributed to its heterogeneous interface, reduced ion diffusion pathways and increased exposure of active sites for sodium storage due to its hierarchical nanosheet structure. Additionally, amino functionalized graphene oxide with uniform nitrogen doping could improve electronic conductivity. The cell employing MoS₂@CoS₂@En-RGO with superior ion mobility and enhanced adsorption energy of Na⁺ ions achieves a cycle stability of 541.2 mA h g⁻¹ after 1800 cycles. The increased adsorption energy facilitates a more efficient sodiation process at MoS₂@CoS₂@En-RGO compared to En-RGO. Additionally, the MoS₂@CoS₂@En-RGO anode demonstrates a capacity retention of 95.8% after 1800 cycles at 1 A g⁻¹. The enhanced mobility of Na ions and the effective adsorption of polysulfide chains in MoS₂@CoS₂@En-RGO have been examined through DFT calculations, confirming its potential as a promising anode material for

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Surface Second Harmonic Generation from Topological Dirac Semimetal PdTe2

arXiv

引用

arXiv 2023年

作者： Faizanuddin, Syed Mohammed Chien, Ching-Hang Chan, Yao-Jui Kuo, Chia-Nung Lue, Chin Shuan Wen, Yu-Chieh Institute of Physics Academia Sinica Taipei11529 Taiwan Nano Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei11529 Taiwan Department of Engineering and System Science National Tsing Hua University Hsinchu300044 Taiwan Department of Physics National Cheng Kung University Tainan701401 Taiwan Research Center for Applied Sciences Academia Sinica Taipei11529 Taiwan

Three-dimensional topological semimetals were shown to host anomalously strong optical nonlinearity, but yet whether such enhancement can occur at their surfaces via topological boundary states remains an open question. Here we tackle this question by examining polarization-dependent rotational-anisotropy optical second harmonic generation (SHG) from transition metal dichalcogenide Dirac semimetal PdTe2. We find its reflected SHG to follow C3v surface symmetry with a time-varying intensity dictated by oxidation kinetics of the material after its surface cleavage, confirming the surface-derived origin of SHG. The complex surface nonlinear optical susceptibility tensor is fully characterized by heterodyne interferometry, unveiling a hidden giant out-of-plane response χzzz (2) (> 10.6 nm2/V or, equivalently, an effective bulk nonlinear susceptibility > 10.3 nm/V). Our results highlight the topological surfaces/interfaces as a new route toward nonlinear optical applications with released symmetry constraints, and demonstrate SHG as a viable means for in situ probing of surface chemistry of topological systems. Copyright © 2023, The Authors. All rights reserved.

关键词： Nonlinear optics

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Electroactive Carbazole-Based Polycyclic Aromatic Hydrocarbons: Synthesis, Photophysical Properties, and Computational Studies

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ACS omega 2024年第27期9卷 29379-29390页

作者： Hui Qi Wong Ting-Hsuan Lin Jian-Ming Liao Septia Kholimatussadiah Febri Baskoro Hui-Hsu Gavin Tsai Hung-Ju Yen Institute of Chemistry Academia Sinica 128 Academia Road Section 2 Nankang Taipei 11529 Taiwan. Sustainable Chemical Science and Technology Program Taiwan International Graduate Program (TIGP) Academia Sinica and National Taiwan University Taipei 11529 Taiwan. Department of Chemical Engineering National Taiwan University Taipei 10617 Taiwan. Department of Chemical Engineering National Taiwan University of Science and Technology Taipei 10607 Taiwan. Department of Chemistry National Central University No. 300 Zhongda Rd. Zhongli District Taoyuan City 32001 Taiwan. Nano Science and Technology Program TIGP Academia Sinica and National Taiwan University Taipei 11529 Taiwan. Research Center of New Generation Light Driven Photovoltaic Module National Central University No. 300 Zhongda Road Zhongli District Taoyuan City 32001 Taiwan.

Herein, we explored the oxidative coupling reactions of carbazole-based polycyclic aromatic hydrocarbons using traditional Scholl reactions and electrochemical oxidation. Our findings indicate that the oxidation predominantly occurs at the carbazole functional group. The underlying reaction mechanisms were also clarified through theoretical investigations, highlighting that the primary oxidation pathway involves the 3,6-positions of the carbazole moiety, which is attributable to its high electron density.

关键词： Aromatic compounds Cations Show More

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