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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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Recent advances in microsystem approaches for mechanical characterization of soft biological tissues

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Microsystems & Nanoengineering 2022年第4期8卷 1-16页

作者： Enming Song Ya Huang Ningge Huang yongfeng mei Xinge Yu John A.Rogers Shanghai Frontiers Science Research Base of Intelligent Optoelectronics and Perception Institute of OptoelectronicsFudan UniversityShanghai 200433China International Institute of Intelligent Nanorobots and Nanosystems Fudan UniversityShanghai 200433China Department of Biomedical Engineering City University of Hong KongHong Kong 999077China Department of Materials Science Fudan UniversityShanghai 200433China Querrey Simpson Institute for Bioelectronics Department of Materials Science and EngineeringDepartments of Biomedical EngineeringNeurological SurgeryChemistryMechanical EngineeringElectrical Engineering and Computer ScienceNorthwestern UniversityEvanstonIL 60208USA

Microsystem technologies for evaluating the mechanical properties of soft biological tissues offer various capabilities relevant to medical research and clinical diagnosis of pathophysiologic *** progress includes(1)the development of tissue-compliant designs that provide minimally invasive interfaces to soft,dynamic biological surfaces and(2)improvements in options for assessments of elastic moduli at spatial scales from cellular resolution to macroscopic areas and across depths from superficial levels to deep *** review summarizes a collection of these technologies,with an emphasis on operational principles,fabrication methods,device designs,integration schemes,and measurement *** core content begins with a discussion of platforms ranging from penetrating filamentary probes and shape-conformal sheets to stretchable arrays of ultrasonic *** sections examine different techniques based on planar microelectromechanical system(MEMS)approaches for biocompatible interfaces to targets that span scales from individual cells to *** highlighted example includes miniature electromechanical devices that allow depth profiling of soft tissue biomechanics across a wide range of *** clinical utility of these technologies is in monitoring changes in tissue properties and in targeting/identifying diseased tissues with distinct variations in *** results suggest future opportunities in engineered systems for biomechanical sensing,spanning a broad scope of applications with relevance to many aspects of health care and biology research.

关键词： advances identifying utility

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

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

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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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

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

Conductive resilient graphene aerogel via magnesio- thermic reduction of graphene oxide assemblies

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Nano Research 2015年第5期8卷 1710-1717页

作者： Huang Tang Peibo Gao Zhihao Bao Bin Zhou Jun Shen yongfeng mei Guangming Wu Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology School of Physics Science and Engineering Tongji University 1239 Siping Road Shanghai 200092 China Department of Materials Science and Engineering Fudan University 220 Handan Road Shanghai 200433 China

Graphene aerogels are desirable for energy storage and conversion, as catalysis supports, and as adsorbents for environmental remediation. To produce graphene aerogels with low density, while maintaining high electrical conductivity and strong mechanic performance, we synthesized graphene aerogels by the magnesiothermic reduction of a freeze-dried graphene oxide （GO） self-assembly and subsequent etching of the formed MgO in acid solution. The reduced graphene oxide （rGO） aerogel samples exhibited densities as low as 1.1 mg·cm^-3. The rGO aerogel was very resilient, exhibiting full recoveryeven after being compressed by strains of up to 80%; its elastic modulus （E） scaled with density （p） as E-p^2. The rGO aerogels also exhibited high conductivities （e.g., 27.7 S·m^-1 at 3.6 mg·cm^-3） and outperformed many rGO aerogels fabricated by other reduction processes. Such outstanding properties were ascribed to the microstructures inherited from the freeze-dried GO self-assembly and the magnesiothermic reduction process.

关键词： graphene aerogel magnesiothermic reduction conductivity mechanical properties

Spectrum projection with a bandgap-gradient perovskite cell for colour perception

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Light(Science & Applications) 2020年第1期9卷 466-478页

作者： mei-Na Zhang Xiaohan Wu Antoine Riaud Xiao-Lin Wang Fengxian Xie Wen-Jun Liu yongfeng mei David Wei Zhang Shi-Jin Ding State Key Laboratory of ASIC and System School of MicroelectronicsFudan UniversityShanghai 200433China Engineering Research Centre of Advanced Lighting Technology Ministry of EducationFudan UniversityShanghai 200433China Department of Materials Science Fudan UniversityShanghai 200433China

Optoelectronic devices for light or spectral signal detection are desired for use in a wide range of applications,including sensing,imaging,optical communications,and in situ ***,existing photodetectors indicate only light intensities,whereas multiphotosensor spectrometers require at least a chip-level assembly and can generate redundant signals for applications that do not need detailed spectral *** by human visual and psychological light perceptions,the compression of spectral information into representative intensities and colours may simplify spectrum processing at the device ***,we propose a concept of spectrum projection using a bandgap-gradient semiconductor cell for intensity and colour ***-gradient perovskites,prepared by a halide-exchanging method via dipping in a solution,are developed as the photoactive layer of the *** fabricated cell produces two output signals:one shows linear responses to both photon energy and flux,while the other depends on only photon ***,by combining the two signals,the single device can project the monochromatic and broadband spectra into the total photon fluxes and average photon energies(i.e.,intensities and hues),which are in good agreement with those obtained from a commercial photodetector and *** changing illumination in real time,the prepared device can instantaneously provide intensity and hue *** addition,the flexibility and chemical/bio-sensing of the device via colour comparison are ***,this work shows a human visual-like method of spectrum projection and colour perception based on a single device,providing a paradigm for high-efficiency spectrum-processing applications.

关键词： projection perovskite gradient