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ess Enhanced photothermoelectric conversion in selfrolled tellurium photodetector with geometryinduced energy localization

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Light(Science & Applications) 2024年第8期13卷 1545-1556页

作者： Jiayuan Huang Chunyu You Binmin Wu Yunqi Wang Ziyu Zhang Xinyu Zhang Chang Liu Ningge Huang Zhi Zheng Tingqi Wu Suwit Kiravittaya yongfeng mei Gaoshan Huang Department of Materials Science&State Key Laboratory of Molecular Engineering of Polymers Fudan UniversityShanghai 200438China Yiwu Research Institute of Fudan University Yiwu 322000 ZhejiangChina International Institute of Intelligent Nanorobots and Nanosystems Fudan UniversityShanghai 200438China ShanghaiTech Quantum Device Lab ShanghaiTech UniversityShanghai 200120China Department of Electrical Engineering Faculty of EngineeringChulalongkorn UniversityBangkokThailand Shanghai Frontiers Science Research Base of Intelligent Optoelectronics and Perception Institute of OptoelectronicsFudan UniversityShanghai 200438China

Photodetection has attracted significant attention for information *** the implementation relies primarily on the photonic detectors,they are predominantly constrained by the intrinsic bandgap of active *** the other hand,photothermoelectric(PTE)detectors have garnered substantial research interest for their promising capabilities in broadband detection,owing to the self-driven photovoltages induced by the temperature *** get higher performances,it is crucial to localize light and heat energies for efficient ***,there is limited research on the energy conversion in PTE detectors at micro/nano *** this study,we have achieved a twoorder-of-magnitude enhancement in photovoltage responsivity in the self-rolled tubular tellurium(Te)photodetector with PTE *** illumination,the tubular device demonstrates a maximum photovoltage responsivity of 252.13 VW^(-1)and a large detectivity of 1.48×10^(11)*** disclose the mechanism of the PTE conversion in the tubular structure with the assistance of theoretical *** addition,the device exhibits excellent performances in wide-angle and polarization-dependent *** work presents an approach to remarkably improve the performance of photodetector by concentrating light and corresponding heat generated,and the proposed self-rolled devices thus hold remarkable promises for next-generation on-chip photodetection.

关键词： illumination energy primarily

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Tubular micro/nanoengines： boost motility in a tiny world

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Science Bulletin 2017年第8期62卷 525-527页

作者： Borui Xu yongfeng mei Department of Materials Science Fudan University Shanghai 200433 China

Since 20th century,the development of rocket science has put forward to the dream of humankind that one day we can reach other planets except for observing them through *** rockets get rid of gravity by a powerful engine,consuming chemical fuel to generate a vast *** by rockets and motors in macroscale,researchers on nanoscience and nanotechnology are able to construct engines which can carry and transport cargos

关键词：诺贝尔化学奖管状运动世界纳米科学地心引力推力计算研究人员

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2D-material-integrated whispering-gallery-mode microcavity

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Photonics Research 2019年第8期7卷 905-916页

作者： LU WANG XUEFEI ZHOU SHUO YANG GAOSHAN HUANG yongfeng mei Department of Materials Science and State Key Laboratory of ASIC and System Fudan University

Optical microcavities, which support whispering gallery modes, have attracted tremendous attention in both fundamental research and potential applications. The emerging of two-dimensional materials offers a feasible solution to improve the performance of traditional microcavity-based optical devices. Besides, the integration of two-dimensional materials with microcavities will benefit the research of heterogeneous materials on novel devices in photonics and optoelectronics, which is dominated by the strongly enhanced light–matter *** review focuses on the research of heterogeneous two-dimensional-material whispering-gallery-mode microcavities, opening a myriad of lab-on-chip applications, such as optomechanics, quantum photonics, comb generation, and low-threshold microlasing.

关键词： 2D-material-integrated whispering-gallery-mode microcavity Optical microcavities

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Printable inorganic nanomaterials for flexible transparent electrodes:from synthesis to application

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Journal of Semiconductors 2018年第1期39卷 16-37页

作者： Dingrun Wang yongfeng mei Gaoshan Huang Department of Materials Science Fudan University

Printed and flexible electronics are definitely promising cutting-edge electronic technologies of the future. They offer a wide-variety of applications such as flexible circuits, flexible displays, flexible solar cells, skinlike pressure sensors, and radio frequency identification tags in our daily life. As the most-fundamental component of electronics, electrodes are made of conductive materials that play a key role in flexible and printed electronic devices. In this review, various inorganic conductive materials and strategies for obtaining highly conductive and uniform electrodes are demonstrated. Applications of printed electrodes fabricated via these strategies are also described. Nevertheless, there are a number of challenges yet to overcome to optimize the processing and performance of printed electrodes.

关键词： printed electrodes conductive ink metal nanomaterials carbonaceous materials composite nanomaterials

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Self-rolled TiO2 microscroll/graphene composite for electrochemical dopamine sensing

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Progress in Natural Science:Materials International 2020年第3期30卷 337-342页

作者： Fei Ma Bin Yang Zhiwei Zhang Jilie Kong Gaoshan Huang yongfeng mei Department of Materials Science Fudan University Department of Chemistry Fudan University

Dopamine is an important neurotransmitter,and nonenzyme electrochemical sensor of dopamine detection based on highly active material is urgently *** this work,an electrochemical sensor with high sensitivity and selectivity based on self-rolled TiO2microscroll/graphene composite was developed and validated for dopamine *** device exhibited a superior performance for dopamine detection with a detection limit of 4.25×10-9mol L-1,and in the dopamine concentration range of 0.06–90μmol L-1,the oxidation currents increased linearly with the *** remarkable performance enhancement was mainly ascribed to the increased surface area due to the porous surface of the TiO2nanomembrane and highly conductive graphene *** addition,we have demonstrated that the sensor could be effectively used on detecting dopamine concentrations in urine *** work demonstrates that the current microscroll-based device is promising in the field of real-time health monitoring for future human community.

关键词： Electrochemical sensor Dopamine sensor Self-rolling Microscroll 3D nanostructures

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Requirement and Development of Hydrogel Micromotors towards Biomedical Applications

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Research 2020年第1期2020卷 1357-1371页

作者： Xinyi Lin Borui Xu Hong Zhu Jinrun Liu Alexander Solovev yongfeng mei Department of Materials Science State Key Laboratory of ASIC and SystemsFudan UniversityShanghai 200433China

With controllable size,biocompatibility,porosity,injectability,responsivity,diffusion time,reaction,separation,permeation,and release of molecular species,hydrogel microparticles achieve multiple advantages over bulk hydrogels for specific biomedical ***,so far studies mostly concentrate on local responses of hydrogels to chemical and/or external stimuli,which significantly limit the scope of their *** micromotors are autonomous microdevices capable of converting local chemical energy or the energy of external fields into motive forces for self-propelled or externally powered/controlled *** hydrogels can be integrated with micromotors,their applicability can be significantly extended and can lead to fully controllable responsive chemomechanical ***,to achieve these challenging goals,biocompatibility,biodegradability,and motive mechanisms of hydrogel micromotors need to be simultaneously *** review summarizes recent achievements in the field of micromotors and hydrogels and proposes next steps required for the development of hydrogel micromotors,which become increasingly important for in vivo and in vitro bioapplications.

关键词： steps autonomous separation

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Preface to the Special Issue on Flexible Materials and Structures for Bioengineering,Sensing,and Energy Applications

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Journal of Semiconductors 2020年第4期41卷 1-2页

作者： yongfeng mei Wei Gao Hui Fang Yuan Lin Guozhen Shen Department of Materials Science State Key Laboratory of ASIC and SystemsFudan UniversityShanghai200433China Department of Medical Engineering Division of Engineering and Applied ScienceCalifornia Institute of TechnologyPasadenaCAUSA Department of Electrical and Computer Engineering Northeastern UniversityBostonMA 02115USA State Key Laboratory of Electronic Thin films and Integrated Devices University of Electronic Science and Technology of ChinaChengdu610054China State Key Laboratory for Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing100083China

Human body with curved and soft interfaces requests advanced flexible materials and structures for the interaction with organs and signal collection from targets in applications such as bioengineering and diagnostic *** them,it is highly demanded to achieve creative design in flexible materials and structures with great stretchable capability for required *** this end,both inorganic and organic materials could be adopted and designed with assembly and self-assembly methods for flexible electronics and *** or flexible materials and structures inspired by nature can lead to highly conformal contacts between devices and the human *** approaches hold great potential for applications in flexible electronics,medical imaging technology and portable disease *** strategy on related sensors/actuator and energy storage/generation devices could overcome certain limitations on flexible materials engineering and thus advance the field as *** these methods would deliver a profound impact to our future intelligent society.

关键词： overcome curved engineering

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Temperature-dependent optical resonance in a thin-walled tubular oxide microcavity

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Progress in Natural Science:Materials International 2017年第4期27卷 498-502页

作者： Yangfu Fang Xianyun Lin Shiwei Tang Borui Xu Jiao Wang yongfeng mei Department of Materials Science Fudan University Department of Physics Faculty of Science Ningbo University School of Information Science & Engineering Fudan University

This work proposes a temperature-response capability of optical resonance in tubular optical oxide microcavities. The thin wall thickness with a subwavelength scale enables these microcavities to interact with the environment effectively. By optimization of the geometries and materials, the tubular microcavities can be tuned into temperature-inert in vacuum, and the experiments support this design. The experiments prove the idea of utilizing them as temperature-inert microcavities. Contrary wavelength shifts from previous studies were observed, which can be explained with the theoretical model. Furthermore, the theoretical results of the present work suggest that novel rolled-up microtubes could act as an exceptional optical microcavity for the application in temperature response.

关键词： Microcavities Rolled-up Whispering gallery mode(WGM) Temperature-response Mie scattering method

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Shape Memory Alloy Helical Microrobots with Transformable Capability towards Vascular Occlusion Treatment

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Research 2022年第4期2022卷 493-505页

作者： Hehua Zhang Borui Xu Yi Ouyang Yunqi Wang Hong Zhu Gaoshan Huang Jizhai Cui yongfeng mei Department of Materials Science Fudan UniversityShanghai 200438China Shanghai Frontiers Science Research Base of Intlligent Optoelectronics and Perception Institute of OptoelectronicsFudan UniversityShanghai 200433China Yiwu Research Institute of Fudan University Yiwu 322000ZhejiangChina International Institute for Inteligent Nanorobots and Nanosystems Fudan UniversityShanghai 200438China

Practical implementation of minimally invasive biomedical applications has been a long-sought goal for *** this field,most previous studies only demonstrate microrobots with locomotion ability or performing a single task,unable to be functionalized ***,we propose a biocompatible shape memory alloy helical microrobot with regulative structure transformation,making it possible to adjust its motion behavior and mechanical properties ***,towards vascular occlusion problem,these microrobots reveal a fundamental solution strategy in the mechanical capability using shape memory *** shape-transformable microrobots can not only manipulate thrust and torque by structure to enhance the unclogging efficiency as a microdriler but also utilize the high work energy to apply the expandable helical tail as a selfpropulsive *** strategy takes advantage of untethered manipulation to operate microsurgery without unnecessary *** study opens a route to functionalize microrobots via accurate tuning in structures,motions,and mechanical properties.

关键词： alloy shape helical

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Rolling origami with smart materials

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Science Bulletin 2019年第15期64卷 1080-1082页

作者： Yang Wang Xing Li Borui Xu Ziao Tian Zengfeng Di yongfeng mei Department of Materials Science Fudan UniversityShanghai200433China State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai200050China

Three-dimensional (3D) functional devices have become an interesting topic meeting the challenge of device miniaturization and high integration in electron devices and microelectromechanical systems. Based on this exciting situation, origami in micro/nanoscale combining art and advanced science was widely utilized to transform two-dimensional (2D) sheets into 3D microstructures for various applications, such as micro-grippers [1](Fig. 1a).

关键词： origami materials challenge

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