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Boosting of bio bacterial inactivation and properties of morphology tuned carbon anchored ZnO films

Applied physics A: materials science and Processing 2025年第6期131卷 1-10页

作者： Balachandar, B.K. Lakshmi, G. Thiyakarajan, C. Sethuraman, K. Department of Physics Velammal College of Engineering & Technology Madurai625009 India Sivakasi626140 India Department of Materials Science School of Technology Central University of Tamil Nadu Thiruvarur610005 India

Carbon-incorporated zinc oxide (CZO) samples were prepared using a wet chemical method. The carbon doping on structural, morphological and spectral features of CZO films were studied. The incorporation of C into ZnO can enhance surface bioactivity. Carbon doping enhances film roughness, reduces sheet resistance, and minimizes bandgap and recombination of electron-hole pairs. It mainly activates reactive oxygen species and causes oxidative stress, which damages the cell membrane and prevents bacterial growth, which leads to cell death. Variations in the dominant XRD peak (101) of CZO samples yielded an average crystallite size of ∼50 nm. The Raman peaks at ∼342 cm− 1, 444 cm− 1and 1163 cm− 1 in CZO 0 thin film were shifted and broadened in doped CZO film. The doped CZO films show a lower optical bandgap of ∼ 3.10 eV than the CZO 0 film. The antibacterial activities for prepared CZO films were conducted by the zone inhibition method for the effective use of films in biomedical applications. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2025.

关键词： Cell death

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In situ Simulation of Thermal Reality

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Research 2024年第2期2023卷 685-690页

作者： Peng Jin Jinrong Liu Fubao Yang Fabio Marchesoni Jian-Hua Jiang Jiping Huang Department of Physics State Key Laboratory of Surface Physicsand Key Laboratory of Micro and Nano Photonic Structures(MOE)Fudan UniversityShanghai 200438China Center for Phononics and Thermal Energy Science Shanghai Key Laboratory of Special Artificial Microstructure Materials and TechnologySchool of Physics Science and EngineeringTongji UniversityShanghai 200092China Department of Physics University of CamerinoCamerino 62032Italy Suzhou Institute for Advanced Research University of Science and Technology of ChinaSuzhou 215123China

Simulated reality encompasses virtual,augmented,and mixed realities梕ach characterized by different degrees of truthfulness in the visual perception:"all false","coexistence of true and false,"and"difficult distinction between true and false,"*** all these technologies,however,the temperature rendering of virtual objects is still an unsolved ***,the lack of thermal tactile functions substantially reduces the quality of the user's real-experience *** address this challenge,we propose theoretically and realize experimentally a technological platform for the in situ simulation of thermal *** this purpose,we design a thermal metadevice consisting of a reconfigurable array of radiating units,capable of generating the thermal image of any virtual object,and thus rendering it in situ together with its thermal *** is a substantial technological advance,which opens up new possibilities for simulated reality and its applications to human activities.

关键词： false rendering signature

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Atomic layer deposition of zinc oxide onto 3D porous iron scaffolds for bone repair:in vitro degradation,antibacterial activity and cytocompatibility evaluation

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Rare Metals 2022年第2期41卷 546-558页

作者： Yu-Lei Li Jin He Hai-Xia Ye Can-Can Zhao Wei-Wei Zhu Xiong Lu Fu-Zeng Ren Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Institute of Applied Physics and Materials Engineering Faculty of Science and TechnologyUniversity of MacaoMacao 999078China Key Lab of Advanced Technologies of Materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China

3D porous iron(Fe)scaffolds with interconnected open pores are promising candidates for bone ***,the bare 3D porous Fe scaffolds lack of antibacterial activity and the ability for cell ***,atomic layer deposition technique was used to deposit nanometer-thick zinc oxide(ZnO)layer onto the skeleton of 3D porous Fe scaffolds with interconnected open *** effect of ZnO thin film on the in vitro degradation behavior,antibacterial activity and cytocompatibility of 3D porous Fe scaffolds was systematically *** results showed that a dense ZnO thin film with a thickness of 76 nm was uniformly deposited on the skeleton of the porous Fe *** thickness of ZnO thin film could be easily controlled by the deposition *** deposited ZnO thin film significantly reduced the degradation rate of porous Fe scaffolds and the fabricated ZnO coated porous Fe scaffolds demonstrated strong antibacterial ability against both Gram-negative Escherichia coli and Gram-positive Staphylococcus aureus,while did not significantly affect cytocompatibility and could also promote cell adhesion.

关键词： Atomic layer deposition Porous iron scaffolds ZnO Antibacterial activity

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Enhanced magnetoelectric coupling in two-dimensional hybrid multiferroic heterostructures

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Physical Review B 2024年第16期110卷 165408页

作者： Xilong Xu Li Yang Department of Physics Institute of Materials Science and Engineering

Magnetoelectric coupling in insulating multiferroic materials is invaluable for both fundamental research and multifunctional device applications. However, material realization remains a significant challenge. We employ first-principles calculations to predict an enhanced and stacking-robust magnetoelectric coupling in a multiferroic van der Waals heterostructure consisting of CrCl3 and CuCrP2S6. Within this heterostructure, the intralayer ferroic orders exhibit characteristics of a type-I multiferroic, while the interlayer ferroic orders resemble those of a type-II multiferroic, thus creating a hybrid-type multiferroic. Notably, the interlayer magnetic configuration can be switched upon electric-polarization reversal, while maintaining the insulating property without any nontrivial phase transitions. Our analysis reveals a strongly interfacial spin local-field effect and proximity polarization effect on band alignments. These factors work synergistically to decide the interlayer exchange interaction and drive enhanced magnetoelectric coupling. Finally, we show that this magnetoelectric effect is robust in multilayer structures, exhibiting a dependence on the layer number's parity. This research offers promising prospects for discovering enhanced magnetoelectric couplings in hybrid multiferroic van der Waals heterostructures.

关键词： Magnetoelectric effect 2-dimensional systems Heterostructures Multiferroics First-principles calculations Hybrid functionals

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Tunable polar distortions and magnetism in GdxLa1−xPtSb epitaxial films

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Physical Review materials 2024年第10期8卷 104413页

作者： Dongxue Du Chenyu Zhang Jingrui Wei Yujia Teng Konrad T. Genser Paul M. Voyles Karin M. Rabe Jason K. Kawasaki Materials Science and Engineering Department of Physics and Astronomy

Hexagonal ABC intermetallics are predicted to have tunable ferroelectric, topological, and magnetic properties as a function of the polar buckling of BC atomic planes. We report the impact of isovalent lanthanide substitution on the buckling, structural phase transitions, and electronic and magnetic properties of GdxLa1−xPtSb films grown by molecular beam epitaxy (MBE) on c plane sapphire substrates. The GdxLa1−xPtSb films form a solid solution from x=0 to x=1 and retain the polar hexagonal structure (P63mc) out to x≤0.95. With increasing x, the PtSb buckling increases and the out-of-plane lattice constant c decreases due to the lanthanide contraction. While hexagonal LaPtSb is a highly conductive polar metal, the carrier density decreases with x until an abrupt phase transition to a zero band overlap semimetal is found for cubic GdPtSb at x=1. The magnetic susceptibility peaks at small but finite x, which we attribute to Ruderman-Kittel-Kasuya-Yosida (RKKY) coupling between localized 4f moments, whose concentration increases with x, and free carriers that decrease with x. Samples with x≥0.3 show antiferromagnetic Curie-Weiss behavior and a Neel temperature that increases with x. The GdxLa1−xPtSb system provides opportunities to dramatically alter the polar buckling and concentration of local 4f moments.

关键词： Electronic structure Ferroelectricity Magnetism Molecular beam epitaxy

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Rational design of comb-like 1D-1D ZnO-ZnSe heterostructures toward their excellent performance in flexible photodetectors

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Nanoscale 2024年第23期16卷 11203-11210页

作者： Liu, Ming-Jin Chen, Hsuan-Chu Yang, Tse-Ning Wu, Shu-Chi Kuo, Yao-Jen Cyu, Ruei-Hong Peng, Yu-Ren Chueh, Yu-Lun Department of Materials Science and Engineering National Tsing-Hua University 30013 Taiwan College of Semiconductor Research National Tsing-Hua University Hsinchu30013 Taiwan Department of Physics National Sun Yat-Sen University Kaohsiung80424 Taiwan Department of Materials Science and Engineering Korea University Seoul02841 Korea Republic of

One-dimensional (1D) Zn-based heterostructures have attracted considerable interest in the field of photodetection because of their tunable properties, flexibility, and unique optoelectronic properties. However, designing 1D multi-component Zn-based heterostructures for advanced photodetectors is still a great challenge. Herein, comb-like 1D-1D ZnO-ZnSe heterostructures with ZnO and ZnSe nanowires (NWs) comprising the shaft and teeth of a comb are reported. The length of the ZnO NWs can be modulated in the range of 300-1200 nm. Microstructural characterizations confirm that the 1D heterostructure clearly shows the spatial distribution of individual components. The well-designed structure displays an extended broadband photoresponse and higher photosensitivity than pure ZnSe NWs. Furthermore, ZnSe NWs with an appropriate length of ZnO branches show increased photoresponses of 3835% and 798% compared to those of pure ZnSe NWs under green and red-light irradiation, respectively. In addition, the integrated flexible photodetector presents excellent folding endurance after 1000 bending tests. This well-designed structure has significant potential for other 1D-based semiconductors in optoelectronic applications. © 2024 The Royal Society of Chemistry.

关键词： Heterojunctions

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Phonon-induced nonadiabatic and adiabatic mechanisms synergistically driving ultrafast interlayer transfer of photogenerated charges in heterostructures of g−C3N4 with MoTe2 and WTe2

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Physical Review B 2024年第16期110卷 165302页

作者： Weibo Li Xiao Tang Yahui Zheng Haidi Wang Zhao Chen Weiduo Zhu Hongyan Lv Chunhua Wang Xiaofeng Liu Haixiao Xiao Xiao Cheng Zeng Zhongjun Li School of Physics Department of Materials Science and Engineering

Phonon vibration excitation is an effective approach to enhance photoelectric conversion efficiency of g−C3N4-based heterostructures, yet the influencing mechanism on interlayer transfer of photogenerated charges remains unclear. Herein, we show first-principles evidence of using g−C3N4/ transition metal dichalcogenide (MoTe2 and WTe2) heterostructures to achieve ultrafast interlayer transfer of photogenerated electrons and holes at the timescales of 4 ps and 200 fs, respectively. Our findings reveal that the fast transfers of photogenerated electrons and holes are both promoted by a nonadiabatic (NA) mechanism, driven via the coupling of donor and acceptor electronic states with the same phonon state. Notably, this coupling in the valence bands is significantly stronger than that in the conduction bands, which enhances interface atom motion, reduces interface distance, and strengthens wave-function overlap of spatial localized electronic states, thereby synergistically producing much faster hole transfer. Moreover, the hole transfer is also enhanced by an adiabatic (AD) mechanism through phonon-induced crossing of valence bands. Our study identifies that the synergistic effects of phonon-induced NA and AD mechanisms play a key role in interlayer transfer of photogenerated charges within g−C3N4-based heterostructures.

关键词： Charge dynamics Electron-phonon coupling Electronic structure Lattice dynamics 2-dimensional systems Interfaces Surfaces Transition metal dichalcogenides Density functional theory First-principles calculations

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Improving nuclear magnetic resonance and electron spin resonance thermometry with size reduction of superparamagnetic iron oxide nanoparticles

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Physical Review Applied 2024年第4期22卷 044082页

作者： Pei-Yun Lin Darshan Chalise David G. Cahill Materials Science and Engineering Materials Research Laboratory Department of Physics

Thermometry based on magnetic resonance has been extensively studied in the context of biomedical imaging. In our previous work, we showed that superparamagnetic iron oxide nanoparticles induce a strong temperature dependence to the spin-spin relaxation time (T2) of nuclear magnetic resonance (NMR) in water because T2 scales with the highly temperature-sensitive self-diffusion constant of water. In this work, in addition to the self-diffusion constant of a fluid, we utilize the temperature-dependent magnetization of 4-nm diameter superparamagnetic iron oxide nanoparticles (SPIONs) to enhance T2 sensitivity (ξT2T=5.0) by 1.4 times over self-diffusion (ξDT=3.5) alone in hexane between 248 and 333 K. We extend the application of this NMR thermometry approach to engineering systems by investigating the temperature dependence of T2 in mineral oil, which exhibits a remarkably high sensitivity (ξT2T=12) between 273 and 353 K. NMR thermometry, however, is not generally applicable to solids. Therefore, we also evaluate the potential of electron spin resonance (ESR) thermometry with SPIONs in the temperature range of 100 to 290 K. The temperature-dependent linewidth follows a T−2 law for 4-nm SPIONs. The linewidth at 290 K at 9.4 GHz is 11 mT. For both NMR and ESR thermometry, SPIONs with a small magnetic moment, i.e., a small volume and reduced magnetization, enhance the temperature sensitivity of magnetic resonance thermometry.

关键词： Cancer Therapeutics Biological materials Magnetic nanoparticles Electron spin resonance Medical imaging Nuclear magnetic resonance Thermometry

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Improving Fatigue Properties of 316L Stainless Steel Welded Joints by Surface Spinning Strengthening

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Acta Metallurgica Sinica(English Letters) 2024年第5期37卷 840-854页

作者： Dongqiqiong Wang Qiang Wang Xiaowu Li Zhefeng Zhang Department of Materials Physics and Chemistry School of Materials Science and Engineeringand Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education)Northeastern UniversityShenyang 110819China Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China College of Light Industry Liaoning UniversityShenyang 110036China

The surface spinning strengthening(3S)mechanism and fatigue life extension mechanism of 316L stainless steel welded joint were systematically elucidated by microstructural analyses and mechanical *** indicate that surface gradient hardening layer of approximately 1 mm is formed in the base material through grain fragmentation and deformation twin strengthening,as well as in the welding zone composed of deformedδ-phases and *** fatigue strength of welded joint after 3S significantly rises by 32%(from 190 to 250 MPa),which is attributed to the effective elimination of surface geometric defects,discrete refinement ofδ-Fe phases and the appropriate improvement in the surface strength,collectively mitigating strain localization and surface fatigue damage within the gradient strengthening *** redistributed fineδ-Fe phases benefited by strong stress transfer of 3S reduce the risk of surface weak phase cracking,causing the fatigue fracture to transition from microstructure defects to crystal defects dominated by slip,further suppressing the initiation and early propagation of fatigue cracks.

关键词： 316L stainless steel Welded joint Surface spinning strengthening Nanotwin Fatigue life

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Layer Hall effect induced by hidden Berry curvature in antiferromagnetic insulators

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National science Review 2024年第2期11卷 15-23页

作者： Rui Chen Hai-Peng Sun Mingqiang Gu Chun-Bo Hua Qihang Liu Hai-Zhou Lu X.C.Xie Shenzhen Institute for Quantum Science and Engineering and Department of Physics Southern University of Science and Technology(SUSTech) International Quantum Academy Institute for Theoretical Physics and Astrophysics University of Würzburg School of Electronic and Information Engineering Hubei University of Science and Technology Guangdong Provincial Key Laboratory of Computational Science and Material Design Southern University of Science and Technology Shenzhen Key Laboratory of Quantum Science and Engineering International Center for Quantum Materials School of PhysicsPeking University Collaborative Innovation Center of Quantum Matter CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences

The layer Hall effect describes electrons spontaneously deflected to opposite sides at different layers, which has been experimentally reported in the MnBi2Te4thin films under perpendicular electric fields. Here, we reveal a universal origin of the layer Hall effect in terms of the so-called hidden Berry curvature, as well as material design principles. Hence, it gives rise to zero Berry curvature in momentum space but non-zero layer-locked hidden Berry curvature in real space. We show that, compared to that of a trivial insulator, the layer Hall effect is significantly enhanced in antiferromagnetic topological insulators. Our universal picture provides a paradigm for revealing the hidden physics as a result of the interplay between the global and local symmetries, and can be generalized in various scenarios.

关键词： layerHall effect hidden Berry curvature antiferromagnetic insulator axion insulator, quantum transport

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