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femtosecond laser-mediated anchoring of polymer layers on the surface of a biodegradable metal

Journal of Magnesium and Alloys 2021年第4期9卷 1380-1388页

作者： Jaeho Park Bo-In Park Young Ju Son Sun Hee Lee Seung-Hoon Um Yu-Chan Kim Myoung-Ryul Ok Jeong-Yun Sun Hyung-Seop Han Hojeong Jeon Center for Biomaterials Korea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea Department of Materials science and Engineering Seoul National University(SNU)Seoul 08826Republic of Korea Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea Division of Bio-Medical Science and Technology KIST SchoolKorea University of Science and TechnologySeoul 02792Republic of Korea KU-KIST Graduate School of Converging Science and Technology Korea UniversitySeoul 02841Republic of Korea

Mg has received much attention as a next-generation implantable material owing to its biocompatibility,bone-like mechanical properties,and biodegradability in physiological *** application of various polymer coatings has been conducted in the past to reduce the rapid formation of hydrogen gas and the local change in pH during the initial phase of the chemical reaction with the body ***,we propose femtosecond(fs)laser-mediated Mg surface patterning for significant enhancement of the binding strength of the coating material,which eventually reduces the corrosion *** of the structural,physical,crystallographic,and chemical properties of the Mg surface have been conducted in order to understand the mechanism by which the surface adhesion increases between Mg and the polymer coating *** on the fs laser conditions,the surface structure becomes rough owing to the presence of several microscaled pits and grooves of nanoporous MgO,resulting in a tightly bonded poly(lactic-co-glycolic acid)(PLGA)*** corrosion rate of the PLGA-coated,fs laser-treated Mg is considerably slow compared with the non-treated Mg;the treated Mg is also more biocompatible compared with the non-treated *** fs laser-based surface modification technique offers a simple and quick method for introducing a rough coating on Mg;further,it does not require any chemical treatment,thereby overcoming a potential obstacle for its clinical use.

关键词： femtosecond laser Biodegradable metal Polymer coating Surface modification Surface adhesion

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femtosecond laser irradiation induced heterojunctions between carbon nanofibers and silver nanowires for a flexible strain sensor

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Journal of Materials Science & Technology 2021年第25期84卷 139-146页

作者： Jiayun Feng Yanhong Tian Sumei Wang Ming Xiao Zhuang Hui Chunjin Hang Walter W.Duley Y.Norman Zhou State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin150001China Centre for Advanced Materials Joining University of WaterlooWaterlooOntarioN2L 3G1Canada laser Micro/Nano-Fabrication Laboratory School of Mechanical EngineeringBeijing Institute of TechnologyBeijing100081China Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes National Laboratory of Mineral MaterialsSchool of Materials Science and TechnologyChina University of GeosciencesBeijing100083China Department of Physics and Astronomy University of WaterlooWaterlooOntarioN2L 3G1Canada

We report the direct joining of carbon nanofibers(CNFs)to silver nanowire(Ag NWs)by controlled irradiation with femtosecond(fs)laser *** separate types of nano-junction dependent on joint geometry,laser fluence and irradiation time are identified in irradiated *** one type of junction,the tip of an Ag NW is melted and flows to form a bond with an adjacent *** second type of junction occurs without significant heating of the Ag NW and involves the softening and flow of carbon in the CNF in response to the transfer of plasmonic energy from the Ag NW into the *** in a T-type joint configuration can be of either kind depending on the relative orientation of the incident optical field and the long axis of the Ag *** simulations were used to explore this effect for different joint geometries and laser *** electrical properties of a heterojunction involving a single Ag NW-CNF structure have been measured,and it is found that the junction resistance can be reduced by six orders of magnitude after laser ***,we have investigated the properties of a strain sensor based on an Ag NW-CNF hybrid nanowire network and find that this device can exhibit high *** sensitivity occurs as nano-junctions induced by fs laser irradiation greatly reduces the initial *** laser-based technique for direct nanojoining of CNF and Ag NWs may enable the design of robust nanowire structures for application in a variety of new devices.

关键词： Nanojoining Carbon nanofiber Silver nanowire femtosecond laser Strain sensor

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femtosecond laser Thermal Accumulation-Triggered Micro-/Nanostructures with Patternable and Controllable Wettability Towards Liquid Manipulating

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Nano-Micro Letters 2022年第6期14卷 206-218页

作者： Kai Yin Lingxiao Wang Qinwen Deng Qiaoqiao Huang Jie Jiang Guoqiang Li Jun He Hunan Key Laboratory of Nanophotonics and Devices School of Physics and ElectronicsCentral South UniversityChangsha 410083People’s Republic of China The State Key Laboratory of High Performance and Complex Manufacturing College of Mechanical and Electrical EngineeringCentral South UniversityChangsha 410083People’s Republic of China Key Laboratory of Testing Technology for Manufacturing Process of Ministry of Education Southwest University of Science and TechnologyMianyang 621010People’s Republic of China

Versatile liquid manipulating surfaces combining patternable and controllable wettability have recently motivated considerable attention owing to their significant advantages in droplet-solid impacting behaviors,microdroplet self-removal,and liquid–liquid interface reaction ***,developing a facile and efficient method to fabricate these versatile surfaces remains an enormous *** this paper,a strategy for the fabrication of liquid manipulating surfaces with patternable and controllable wettability on Polyimide(PI)film based on femtosecond laser thermal accumulation engineering is *** of its controllable micro-/nanostructures and chemical composition through adjusting the local thermal accumulation,the wettability of PI film can be tuned from superhydrophilicity(~3.6°)to superhydrophobicity(~151.6°).Furthermore,three diverse surfaces with patternable and heterogeneous wettability were constructed and various applications were successfully realized,including water transport,droplet arrays,and liquid *** work may provide a facile strategy for achieving patternable and controllable wettability efficiently and developing multifunctional liquid steering surfaces.

关键词： Wettability femtosecond laser Micro-/nanostructures Thermal accumulation Liquid manipulating

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femtosecond laser 3D fabrication of whispering-gallerymode microcavities

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Science China(Physics,Mechanics & Astronomy) 2015年第11期58卷 2-10页

作者： XU HuaiLiang SUN HongBo State Key Laboratory on Integrated Optoelectronics College of Electronic Science and Engineering Jilin University

Whispering-gallery-mode(WGM) microcavities with high-quality factors and small volumes have attracted intense interests in the past decades because of their potential applications in various research fields such as quantum information, sensing, and optoelectronics. This leads to rapid advance in a variety of processing technologies that can create high-quality WGM micro-cavities. Due to the unique characteristics of femtosecond laser pulses with high peak intensity and ultrashort pulse duration, femtosecond laser shows the ability to carry out ultrahigh precision micromachining of a variety of transparent materials through nonlinear multiphoton absorption and tunneling ionization. This review paper describes the basic principle of femtosecond laser direct writing, and presents an overview of recent progress concerning femtosecond laser three-dimensional(3D) fabrications of optical WGM microcavities, which include the advances in the fabrications of passive and active WGMs microcavities in a variety of materials such as polymer, glass and crystals, as well as in processing the integrated WGM-microcavity device. Lastly, a summary of this dynamic field with a future perspective is given.

关键词： microcavity fabrication femtosecond laser

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femtosecond laser micro-nano processing for boosting bubble releasing of gas evolution reactions

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Nano Research 2022年第2期15卷 1672-1679页

作者： Shuai Zhang Lishuang Xu Jie Wu Ying Yang Chengxin Zhang Haiyan Tao Jingquan Lin Licheng Huang Wencheng Fang Keying Shi Xiangting Dong Key Laboratory of Applied Chemistry and Nanotechnology at Universities of Jilin Province Changchun University of Science and TechnologyChangchun 130022China School of Science Changchun University of Science and TechnologyChangchun 130022China International Research Centre for Nano Handling and Manufacturing of China Changchun University of Science and TechnologyChangchun 130022China Key Laboratory of Functional Inorganic Material Chemistry Ministry of EducationSchool of Chemistry and Material ScienceHeilongjiang UniversityHarbin 150080China

Coupling effect of chemical composition and physical structure is a key factor to construct superaerophobic *** all reports about superaerophobic electrodes were aimed at precisely controlling morphology of loaded materials(constructing specific structure)and ignored the due role of ***,in this work,by using high precision and controllable femtosecond laser,hierarchical micro-nano structures with superaerophobic properties were constructed on the surface of silicon substrate(fs-Si),and such special super-wettability could be successfully inherited to subsequent self-supporting electrodes through chemical *** laser processing endowed electrodes with high electrochemical surface area,strong physical structure,and remarkable superaerophobic *** an unconventional processing method,the reconstructed morphology of substrate surface bears the responsibility of superaerophobicity,thus liberating the structural constraints on loaded *** this key of coupling effect is transferred from the loaded materials to substrate,we provided a new general scheme for synthesizing superaerophobic *** successful introduction of femtosecond laser will open a new idea to synthesize self-supporting electrodes for gas-involving reactions.

关键词： femtosecond laser gas evolution reactions hydrogen evolution reaction superaerophobic electrodes bubbles releasing

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femtosecond laser-induced periodic surface structures on hard and brittle materials

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Science China(Technological Sciences) 2024年第1期67卷 19-36页

作者： ZHAO GuoXu WANG Gong LI YunFei WANG Lei LIAN YuDong YU Yu ZHAO Hui WANG YuLei LU ZhiWei Center for Advanced laser Technology Hebei University of TechnologyTianjin 300401China Hebei Key Laboratory of Advanced laser Technology and Equipment Tianjin 300401China State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012China School of Information and Electrical Engineering Hebei University of EngineeringHandan 056038China

Hard and brittle materials have high hardness,excellent optical stability,chemical stability,and high thermal ***,they have huge application potential in various fields,such as optical components,substrate materials,and quantum information,especially under harsh conditions,such as high temperatures and high *** laser direct writing technology has greatly promoted the development of femtosecond laser-induced periodic surface structure(Fs-LIPSS or LIPSS by a femtosecond laser)applications of hard and brittle materials due to its high precision,controllability,and three-dimensional processing *** far,LIPSSs have been widely used in material surface treatment,optoelectronic devices,and ***,a consensus has not been reached regarding the formation mechanism of LIPSSs on hard and brittle *** this paper,three widely accepted LIPSS formation mechanisms are introduced,and the characteristics and applications of LIPSSs on diamonds,silicon,silicon carbide,and fused silica surfaces in recent years are *** addition,the application prospects and challenges of LIPSSs on hard and brittle materials by a femtosecond laser are discussed.

关键词： laser-induced periodic surface structures hard and brittle materials femtosecond laser

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femtosecond laser-assisted switching in perpendicular magnetic tunnel junctions with double-interface free layer

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Science China(Information Sciences) 2022年第4期65卷 251-257页

作者： Luding WANG Wenlong CAI Kaihua CAO Kewen SHI Bert KOOPMANS Weisheng ZHAO Fert Beijing Institute School of Integrated Circuit Science and Engineering Beihang University Department of Applied Physics Institute for Photonic Integration Eindhoven University of Technology

Perpendicular magnetic tunnel junctions with double-interface free layer(p-DMTJs), which exhibit enhanced tunnel magnetoresistance(TMR) and thermal stability(△) at the nanoscale, have received considerable interest as building blocks for spintronic data storage devices. Heat-assisted magnetic recording(HAMR) techniques have been widely employed in mainstream magnetic storage to enable ultrahigh storage density. However, the data access is achieved by sensing the stray field of the selected magnetic element using a mechanical “read head”, resulting in an unfavorable speed limitation and design complexity. To address this issue, integrating laser-assisted switching with a high-performance magnetic tunnel junction has received interest in spintronic R&D; however, it has not yet been achieved. In this study, we experimentally explored femtosecond(fs) laser-assisted switching in a p-DMTJ device using a direct electrical TMR readout. We demonstrate two reconfigurable switching operations, i.e., binary “write” and unidirectional “reset”, by the interplay of the fs laser and synchronized magnetic field sequence. We further explored the joint effect, and a switching phase diagram was obtained. The effect of the stray field of p-DMTJ, as well as laser helicity,on switching is also discussed. Results show the feasibility of fs laser-assisted writing p-DMTJs, which can pave the way in high-density optospintronic storage applications.

关键词： magnetic tunnel junctions (MTJs) heat-assisted magnetic recording (HAMR) spintronics femtosecond laser thermally-assisted switching (TAS)

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femtosecond laser fabrication of 3D vertically aligned micro-pore network on thick-film Li_(4)Ti_(5)O_(12)electrode for high-performance lithium storage

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Journal of Energy Chemistry 2024年第8期95卷 250-262,I0006页

作者： Quansheng Li Xiaofei Sun Xuesong Mei Lingzhi Wang Minxing Yang Jianlei Cui Wenjun Wang State Key Laboratory for Manufacturing System Engineering Xi'an Jiaotong UniversityXi'an 710049ShaanxiChina Shaanxi Key Laboratory of Intelligent Robots Xi'an Jiaotong UniversityXi'an 710049ShaanxiChina School of Mechanical Engineering Xi'an Jiaotong UniversityXi'an 710049ShaanxiChina

The development of energy storage devices with high energy density relies heavily on thick film electrodes,but it is challenging due to the limited ion transport kinetics inherent in thick ***,we report on the preparation of a directional vertical array of micro-porous transport networks on LTO electrodes using a femtosecond laser processing strategy,enabling directional ion rapid transport and achieving good electrochemical performance in thick film *** three-dimensional(3D)vertically aligned micro-pore networks are innovatively designed,and the structure,kinetics characteristics,and electrochemical performance of the prepared ion transport channels are analyzed and discussed by multiple characterization and testing ***,the rational mechanisms of electrode performance improvement are studied experimentally and simulated from two aspects of structural mechanics and transmission *** ion diffusion coefficient,rate performance at 60 C,and electrode interface area of the laser-optimized 60-15%micro-porous transport network electrodes increase by 25.2 times,2.2 times,and 2.15 times,respectively than those of untreated ***,the preparation of 3D micro-porous transport networks by femtosecond laser on ultra-thick electrodes is a feasible way to develop high-energy *** addition,the unique micro-porous transport network structure can be widely extended to design and explore other high-performance energy materials.

关键词： femtosecond laser Micro-porous transport networks laser processing Thick film electrodes Ion transport kinetics

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femtosecond laser-induced microstructure in Foturan glass

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Chinese Physics B 2010年第5期19卷 332-336页

作者：孙海轶骆芳芳何飞廖洋徐剑 State Key Laboratory of High Field laser Physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of Sciences

We report on the microstructure formation in Foturan glass, induced by 1 kHz, 120 femtosecond laser irradiation. It is found that the line-shaped filamentation, not void array tends to be formed in this glass. This is different from our previous experimental results in fused silica and BK7 glasses. A possible mechanism Ag＋ captures the free electrons generated by laser, is proposed to explain the observed phenomena.

关键词： femtosecond laser line-shaped filamentation Foturan glass mechanism

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femtosecond laser-induced graphene for temperature and ultrasensitive flexible strain sensing

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Frontiers of Materials Science 2024年第3期18卷 35-44页

作者： Mingle Guan Zheng Zhang Weihua Zhu Yuhang Gao Sumei Wang Xin Li laser Micro/Nano Fabrication Laboratory School of Mechanical EngineeringBeijing Institute of TechnologyBeijing 100081China Yangtze Delta Region Academy of Beijing Institute of Technology Jiaxing 314000China

Flexible sensors with high sensitivity and stability are essential components of electronic skin,applicable to detecting human movement,monitoring physiological health,preventing diseases,and other *** this study,we utilized a straightforward and efficient femtosecond laser direct writing technique using phenolic resin(PR)as a carbon precursor to produce high-quality laser-induced graphene(LiG)characterized by high crystallinity and low defect *** fabricated LIG underwent comprehensive characterization using SEM,Raman spectroscopy,XPS,and ***,we developed strain sensors with a hexagonal honeycomb pattern and temperature sensors with a line pattern based on PR-derived *** strain sensor exhibited an outstanding measurement factor of 4.16×104 with a rapid response time of 32 ms,which is applied to detect various movements like finger movements and human ***,the temperature sensor demonstrated a sensitivity of 1.49%/°C with a linear response range of 20-5o *** PR-derived LIG shows promising potential for applications in human physiological health monitoring and other advanced wearable technologies.

关键词： femtosecond laser laser-induced graphene flexible sensor high sensitivity

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