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Chinese Physics B 2024年第5期33卷 608-615页

作者：宋伟宾席国强潘昭刘锦叶旭斌刘哲宏王潇单鹏飞张林兴鲁年鹏樊龙龙秦晓梅龙有文 Department of Physics Shanghai Normal UniversityShanghai 200234China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Institute for Advanced Materials Technology University of Science and Technology BeijingBeijing 100083China Songshan Lake Materials Laboratory Dongguan 523808China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China

Bi-based perovskite ferroelectric thin films have wide applications in electronic devices due to their excellent ferroelectric properties.New Bi-based perovskite thin films Bi(Cu_(1/2)Ti_(1/2))O_(3)–PbTiO_(3)(BCT–PT) are deposited on Pt(111)/Ti/SiO_(2)/Si substrates in the present study by the traditional sol–gel method.Their structures and related ferroelectric and fatigue characteristics are studied in-depth.The BCT–PT thin films exhibit good crystallization within the phase-pure perovskite structure,besides,they have a predominant(100) orientation together with a dense and homogeneous microstructure.The remnant polarization(2P_(r)) values at 30 μC/cm^(2) and 16 μC/cm^(2) are observed in 0.1BCT–0.9PT and 0.2BCT–0.8PT thin films,respectively.More intriguingly,although the polarization values are not so high,0.2BCT–0.8PT thin films show outstanding polarization fatigue properties,with a high switchable polarization of 93.6% of the starting values after 10^(8) cycles,indicating promising applications in ferroelectric memories.

关键词： ferroelectric thin films perovskite PbTiO_(3)-BiMeO_(3)

Generation of lossy mode resonances(LMR)using perovskite nanofilms

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Opto-Electronic Advances 2024年第2期7卷 33-40页

作者： Dayron Armas Ignacio R.Matias M.Carmen Lopez-Gonzalez Carlos Ruiz Zamarreño Pablo Zubiate Ignacio del Villar Beatriz Romero Electrical Electronic and Communications Engineering DepartmentPublic University of NavarraPamplona 31006Spain Institute of Smart Cities(ISC) Public University of NavarraPamplona 31006Spain Experimental Science and Technology School Rey Juan Carlos UniversityMostoles 28933Spain

The results presented here show for the first time the experimental demonstration of the fabrication of lossy mode resonance(LMR) devices based on perovskite coatings deposited on planar waveguides. Perovskite thin films have been obtained by means of the spin coating technique and their presence was confirmed by ellipsometry, scanning electron microscopy, and X-ray diffraction testing. The LMRs can be generated in a wide wavelength range and the experimental results agree with the theoretical simulations. Overall, this study highlights the potential of perovskite thin films for the development of novel LMR-based devices that can be used for environmental monitoring, industrial sensing, and gas detection, among other applications.

关键词： perovskite thin films slab waveguide lossy mode resonance

Magnetron co-sputtering synthesis and nanoindentation studies of nanocrystalline(TiZrHf)_(x)(NbTa)_(1–x)high-entropy alloy thin films

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Nano Research 2022年第6期15卷 4873-4879页

作者： Changjun Cheng Xiaofu Zhang Michel J.R.Haché Yu Zou Department of Materials Science and Engineering University of TorontoTorontoOntario M5S 3E4Canada State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology and Center for Excellence in Superconducting ElectronicsChinese Academy of Sciences(CAS)Shanghai 200050China

Refractory high-entropy alloys(HEAs)possess many useful properties such as high strength and high-temperature stability.So far,most studies on refractory HEAs have been limited to a few well-known compositions and on their coarse-grain bulk forms.Here we fabricate nanocrystalline(TiZrHf)_(x)(NbTa)_(1−x)HEA thin films with a large range of compositions(x=0.07–0.90)by the direct current(DC)magnetron co-sputtering technique and measure their mechanical properties using the nanoindentation method.All the as-deposited HEA thin films show a solid-solution body-centered cubic(bcc)structure.As the compositional ratio(x)increases,the elastic modulus decreases from 153 to 123 GPa,following the trend of the rule of mixture.As x increases,the hardness first decreases from 6.5 GPa(x=0.07)to the lowest value(4.6 GPa,x=0.48)and then increases to the highest value(7.1 GPa,x=0.90),showing a concave trend.The change in hardness might be attributed to the combinational influence caused by the atomic size and modulus effects,as well as the texture effect.The authors also propose a few open questions for future studies on this and related HEA systems.

关键词： high-entropy alloys nanocrystalline alloys refractory metals thin films magnetron co-sputtering nanoindentation

Tunable chiroptical application by encapsulating achiral lanthanide complexes into chiral MOF thin films

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Nano Research 2022年第2期15卷 1102-1108页

作者： Rui Zhai Yihong Xiao Zhigang Gu Jian Zhang State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China College of Chemistry and Materials Science Fujian Normal UniversityFuzhou 350007China Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350108China University of Chinese Academy of Sciences Beijing 100049China

Chiral metal-organic frameworks(chirMOFs)have been widely considered on enantioselective adsorption/separation,asymmetric catalysis,biological and nonlinear optical applications.However,chirMOFs are facing a great challenge in development of chiroptical thin films with circularly polarized luminescence(CPL)property.Here,we first report CPL thin films by encapsulating achiral lanthanide complexes Ln(acac)_(3)(Ln=Eu_(a)Tb_(b)Gd_(c))into the pores of surface-coordinated chirMOF thin films(SURchirMOF)[Zn_(2)(cam)_(2)dabco]_(n) with layer by layer(Ibl)encapsulation strategy.Due to the unique combination of chiral porous MOF and adjustable luminescent complexes in the host-guest thin films,the obtained Ln(acac)_(3)@SURchirMOF possess strong and tunable CPL property with high dissymmetry factors.The compared CPL and fluorescent lifetime results show that the advantage of this preparation strategy can effectively achieve energy transfer from Ln(acac)_(3) to SURchirMOF,resulting in an excellent CPL performance.This study not only provides a novel strategy to develop new types of chiral thin films but also offers an efficient approach for tunable chiroptical applications.

关键词： metal-organic frameworks lanthanide complexes thin films encapsulation chiral optical application

Robust hybrid bismuth perovskites as potential photocatalysts for overall water splitting

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Nano Research 2024年第5期17卷 4593-4601页

作者： Antonio J.Chacón-García Herme G.Baldovi Artem A.Babaryk Antonio Rodríguez-Diéguez Sergio Navalón Yolanda Pérez Hermenegildo García Patricia Horcajada Advanced Porous Materials Unit IMDEA Energy InstituteAvda.Ramón y Cajal 328935 MóstolesMadridSpain Departamento de Química Universitat Politècnica de València46022 ValènciaSpain Departamento Química Inorgánica Universidad de Granada1807GranadaSpain Departamento de Biología y Geología Física y Química Inorgánica.ESCET.Universidad Rey Juan Carlos28933 MóstolesMadridSpain Instituto de tecnología química CSIC-UPV Universitat Politècnica de València(UPV)46022Spain

Organic-inorganic hybrid perovskites have gained great attention as promising photocatalysts for hydrogen generation.However,due to their poor stability in water,the use of aqueous hydrohalic acid solutions is specifically required for an efficient hydrogen evolution.Herein,three novel photoactive lead-free hybrid perovskites based on bismuth and triazolium cations(denoted as IEF-15,IEF-16,and IEF-17(IEF stands for IMDEA energy frameworks))were synthesized and fully characterized(structural,compositional,optical,etc.).Further,these solids were proposed as photocatalysts for the challenging gas phase overall water splitting(OWS)reaction.Accordingly,IEF-16 thin films exhibited a remarkable photocatalytic activity in both H_(2) and O_(2) evolution,as a consequence of its appropriate bandgap and energy-band alignment,achieving hydrogen evolution rates ofμmol·g_(H_(2))^(-)1846 and 360 after 24 h under ultraviolet-visible(UV-vis)irradiation or simulated solar irradiation,respectively.This study additionally highlights the remarkable structural and photochemical stability of IEF-16 under different operational conditions(i.***.water volume,irradiation and temperature),paving the way for green hydrogen production from OWS using perovskite-based photocatalysts.

关键词： bismuth-based hybrid perovskites thin films photocatalysis overall water splitting green hydrogen

Growth Behavior of Rubrene thin films on Hexagonal Boron Nitride in the Early Stage

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Chinese Journal of Chemistry 2022年第11期40卷 1298-1304,I0002页

作者： Yujia Wei Di Xue Lianlian Ji Jie Lu Qi Wang Xingyu Jiang Yinghui Sun Zi Wang Lizhen Huang Lifeng Chi Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesCollaborative Innovation Center of Suzhou Nano Science and TechnologySoochow UniversitySuzhouJiangsu 215123China College of Energy Soochow Institute for Energy and Materials InnovationsKey Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu ProvinceSoochow UniversitySuzhouJiangsu 215006China Gusu Laboratory of Materials SuzhouJiangsu 215123China

Two-dimensional materials,with an in-plane ordered and dangling-bonding-free surface,are ideal substrates for fabricating high-quality crystalline thin films.Here,we show a systematic study on the growth of a benchmark organic semiconductor,rubrene,on hexagonal boron nitride(h-BN)substrate via physical vapor deposition from the initial amorphous phase to the final crystalline phase;the role of temperature in such transition and the epitaxy relationship between rubrene and h-BN are revealed.With the increase of substrate temperature,the critical thickness of amorphous-crystalline-transition decreases and the morphology of crystalline phase also evolves from porous to terrace-like.When substrate temperature reaches>100℃,the critical thickness reduces to only 0.5 nm and a precise layer-by-layer growth from the very first layer is achieved,which is quite rare for rubrene growing on other substrates.The high ordering can be attributed to the fine epitaxy relationship between rubrene films and the h-BN surface lattice,and this film demonstrates good charge transport ability with a p-type field-effect mobility of>1 cm^(2)·V^(-1)·s^(-1).

关键词： thin films Crystal growth Organic thin film transistors 2D materials Molecular electronics

Spatially resolved chiroptical study of thin films of benzo[1,2-b:4,5-b’]dithiophene-based oligothiophenes by synchrotron radiation electronic circular dichroism imaging(SR-ECDi)technique

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Aggregate

Aggregate 2022年第5期3卷 217-226页

作者： Gianluigi Albano Marcin Gorecki Tamas Javorfi Rohanah Hussain Giuliano Siligardi Gennaro Pescitelli Lorenzo Di Bari Dipartimento di Chimica e Chimica Industriale Universitàdi PisaPisaItaly Institute of Organic Chemistry Polish Academy of SciencesWarsawPoland Diamond Light Source Ltd.ChiltonUK Dipartimento di Chimica Universita degli Studi di Bari‘Aldo Moro’via Edoardo Orabona 4Bari 70126Italy

The study of the chiroptical properties of thin-film samples of two chiral benzo[1,2-b:4,5-b’]dithiophene-based oligothiophenes with optoelectronic properties was carried out at Diamond B23 beamline using the synchrotron radiation electronic circular dichroism imaging(SR-ECDi)facility.The experimental results support the hypothesis that the non-reciprocal circularly polarized absorption observed in these materials is due to the combined linear dichroism and linear birefringence contributions.The mapping at 50-μM spatial resolution revealed that several species coexist in the mesoscopic chiral domains likely due to different aggregated phases,which were identified in the films by SR-ECDi but could not be detected with benchtop ECD instruments.

关键词： benzo[1,2-b:4,5-b’]dithiophene circular dichroism imaging oligothiophenes synchrotron radiation thin films

Tip-Based Nanomachining on thin films:A Mini Review

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Nanomanufacturing and Metrology 2022年第1期5卷 2-22页

作者： Shunyu Chang Yanquan Geng Yongda Yan Key Laboratory of Micro-Systems and Micro-Structures Manufacturing of Ministry of Education Harbin Institute of TechnologyHarbin 150001China Center for Precision Engineering Harbin Institute of TechnologyHarbin 150001People's Republic of China

As one of the most widely used nanofabrication methods,the atomic force microscopy(AFM)tip-based nanomachining technique offers important advantages,including nanoscale manipulation accuracy,low maintenance cost,and flexible experimental operation.This technique has been applied to one-,two-,and even three-dimensional nanomachining patterns on thin films made of polymers,metals,and two-dimensional materials.These structures are widely used in the fields of nanooptics,nanoelectronics,data storage,super lubrication,and so forth.Moreover,they are believed to have a wide application in other fields,and their possible industrialization may be realized in the future.In this work,the current state of the research into the use of the AFM tip-based nanomachining method in thin-film machining is presented.First,the state of the structures machined on thin films is reviewed according to the type of thin-film materials(i.e.,polymers,metals,and two-dimensional materials).Second,the related applications of tip-based nanomachining to film machining are presented.Finally,the current situation of this area and its potential development direction are discussed.This review is expected to enrich the understanding of the research status of the use of the tip-based nanomachining method in thin-film machining and ultimately broaden its application.

关键词： Atomic force microscopy Tip-based nanomachining thin films Nanostructure Application

Effect of grain size on ferroelectric and dielectric properties of Bi_(3.25)La_(0.75)Ti_(3)O_(12) thin films prepared by rf-magnetron sputtering

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Journal of Advanced Dielectrics 2023年第5期13卷 55-60页

作者： Shuai Ma Wei Li Jigong Hao Yuying Chen Zhijun Xu School of Medicine Liaocheng UniversityLiaocheng 252059P.R.China Beijing Key Laboratory of Digital Stomatology Beijing 100081P.R.China School of Materials Science and Engineering Liaocheng University Liaocheng 252059P.R.China School of Environment and Materials Engineering Yantai University Yantai 264005P.R.China

Bi_(3.25)La_(0.75)Ti_(3)O_(12)(BLT)thin films are promising materials used in non-volatile memories.In this work,BLT films were deposited on Pt(111)/Ti/SiO_(2)/Si substrates by rf-magnetron sputtering method followed by annealing treatments.The microstructures of BLT thin films were investigated via X-ray diffraction(XRD),scanning electron microscopy(SEM)and atomic force microscopy(AFM).With the increase in annealing temperature,the grain size increased significantly and the preferred crystalline orientation changed.A well-saturated hysteresis loop with a superior remnant polarization of 15.4μC/cm^(2) was obtained for BLT thin films annealed at 700°C.The results show that the dielectric constant decreased with the increase in grain sizes.

关键词： thin films rf-magnetron sputtering ferroelectric properties dielectric properties

Orientation dependence on piezoresponse of lead-free piezoelectric sodium bismuth titanate epitaxial thin films

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Journal of Advanced Dielectrics 2023年第4期13卷 41-47页

作者： Jinyan Zhao Wei Ren Zhe Wang Gang Niu Lingyan Wang Yulong Zhao Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education&International Center for Dielectric Research School of Electronic Science and EngineeringXi’anP.R.China State Key Laboratory for Mechanical Manufacturing System Xi’an Jiaotong University Xi’an 710049P.R.China

Lead-free piezoelectric sodium bismuth titanate((Bi0.5Na0.5)TiO3,BNT)thin films were epitaxially grown onto(001)-,(110)-,and(111)-oriented Nb:SrTiO3(STO)single crystal substrates prepared by sol-gel processing.Highly oriented growth in(001),(110),and(111)BNT thin films was obtained in this work benefiting from the lattice match between the BNT film and the STO substrate.The different growth models in thin films with various orientations result in various surface morphologies dependent on the film orientation.The piezoresponse of the BNT thin films was represented exhibiting a strong orientation dependence that(110)>(001)>(111).This is contributed by the various domain switching contribution related to the crystal symmetry and polarization distribution in the three oriented thin films.

关键词： Sodium bismuth titanate lead-free orientation dependence thin films piezoelectric properties