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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

Nanomembrane folding origami: Geometry control and micro-machine applications

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Progress in Natural Science:Materials International 2021年第6期31卷 865-871页

作者： Yang Zong Xinyuan Zhang Yue Wu Yang Wang Chang Liu Borui Xu Gaoshan Huang Jizhai Cui yongfeng mei Department of Materials Science State Key Laboratory of ASIC and Systems Fudan University International Institute for Intelligent Nanorobots and Nanosystems Fudan University Shanghai Frontiers Science Research Base of Intelligent Optoelectronics and Perception Institute of Optoelectronics Fudan University Yiwu Research Institute of Fudan University

Three-dimensional(3D) microstructures have important applications in a wide range of engineering fields. A strategy of nanomembrane folding origami with microdroplet-guided intercalation and strain engineering to construct complex 3D microstructures for micro-machine applications is proposed in the present *** results showed that nanomembranes were released by the microdroplet intercalation and subsequently fold up as creases, or remain flat as facets, depending on the strain design configurations. The 3D geometry can be controlled by the crease design and by an externally applied magnetic field. Moreover, this folding strategy is used to construct magnetic micro-mirror arrays, magnetic micro-robots, and a twin-jet motor platform, showing potential micro-machine applications in optical micro-devices and robotics. This strategy offers a simple,precise, and designable method of folding 3D microstructures for fundamental research and practical applications.

关键词： Folding origami Liquid-triggered delamination Strain engineering Magnetic manipulation Micro-machine

Gas-Solution Interface Technique as a simple method to produce inorganic microtubes with scroll morphology

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Progress in Natural Science:Materials International 2020年第3期30卷 279-288页

作者： Larisa B.Gulina Valeri P.Tolstoy Alexander A.Solovev Vladislav E.Gurenko Gaoshan Huang yongfeng mei Department of Solid State Chemistry Saint-Petersburg State University Department of Materials Science Fudan University

Over the past decade, numerous studies have dealt with new properties of inorganic nanomaterials with improved characteristics due to a particular morphology, and new facile methods to produce such materials have been reported. Inorganic microtubes can be designed for multifunctional materials with highly specific surface area. These microtubes can act as individual on-chip components of miniature devices or off-chip micromachines. The paper first discusses the main regularities of the reactions at the gas-solution interface and then goes on to present the basic principles of the Gas-Solution Interface Technique(GSIT), thus demonstrating a new way of facile synthesis of inorganic rolled-up microtubes. A distinctive feature of the technique is the formation of a gradient solid layer on the surface of the aqueous solution as a result of the gaseous and liquid reagents interaction. When dried in the air, this thin layer is capable of self-folding into microtubes with specific morphology. The paper considers the specific features of microtubes obtained by GSIT from numerous classes of inorganic compounds, including oxides, hydroxides, sulfides, fluorides. Further areas of possible practical applications of GSIT microtubes are discussed. The prospects of future development of the GSIT are outlined.

关键词： Interface Rolled-up microtubes 2D nanocrystals Inorganic machines Nanomaterials

TiO2 nanosheets synthesized by atomic layer deposition for photocatalysis

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Progress in Natural Science:Materials International 2016年第5期26卷 493-497页

作者： Riyanto Edy Yuting Zhao Gaoshan S.Huang Jianjun J.Shi Jing Zhang Alexander A.Solovev yongfeng mei State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Material Science and Engineering Donghua University Department of Materials Science Fudan University College of Science Donghua University

Two-dimensional TiOnanosheets were synthesized by atomic layer deposition(ALD) on dissolvable sacrificial polymer layer. The photocatalytic performance of free-standing TiOnanosheets prepared with different numbers of ALD cycles(100, 300, 500, and 1000) were investigated by evaluating the degradation rates of methyl orange solutions. It is shown that the photocatalytic activity increases due to Tidefect and the locally ordered structures in amorphous TiOnanosheets. The difference in the surface areas of nanosheets may also play a crucial role in the photocatalytic activity. The results obtained in this work can have potential applications in fields like water splitting and dye-sensitized solar cells.

关键词： TiO2 Atomic layer deposition Nanosheet Photocatalysis

Atomic layer deposition-induced integration of N-doped carbon particles on carbon foam for flexible supercapacitor

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Journal of Materiomics 2020年第1期6卷 209-215页

作者： Zhe Zhao Ye Kong Chang Liu Jinrun Liu Zhijie Wang Gengfeng Zheng Gaoshan Huang yongfeng mei Department of Materials Science Fudan UniversityShanghai200433China Laboratory of Advanced Materials Fudan UniversityShanghai200438China

Flexible devices have attracted abundant attention in energy storage *** this paper,we presented a novel approach for fabricating flexible supercapacitor based on metal organic frameworks-derived *** this approach,a uniform zeolitic imidazolate frameworks-8 layer with a high mass loading was deposited on a flexible carbon foam(CF)skeleton efficiently by the induction of a uniform ZnO nanomembrane prepared via an atomic layer deposition technique.A flexible N-doped carbon particle-carbon foam(N-CP-CF)composite with a hierarchically porous structure and a large specific surface area(i.e.,538 m^(2) g^(-1))was obtained in a subsequent pyrolysis *** resultant materials have the excellent electrochemical performance(i.e.,a high specific capacitance of 300 F g^(-1) and a high energy density of 20.8 W h kg^(-1)).The N-CP-CF composite can provide a stable capacitance(i.e.,250 F g^(-1))and an energy density(i.e.,17.36 W h kg^(-1))under large deformation(25% of original thickness).This work could propose a promising strategy in fabrication of flexible electrode with a large potential towards energy storage applications in the future.

关键词： Atomic layer deposition Zeolitic imidazolate framework-8 Flexible device Supercapacitor

Strain effect on intersubband transitions in rolled-up quantum well infrared photodetectors

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Journal of Semiconductors 2017年第5期38卷 73-77页

作者： Han Wang Shilong Li Honglou Zhen Xiaofei Nie Gaoshan Huang yongfeng mei Wei Lu National Laboratory for Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai 200083 China University of Chinese Academy of Sciences Beijing 100049 China Department of Materials Science Fudan University Shanghai 200433 China

Pre-strained nanomembranes with four embedded quantum wells（QWs） are rolled up into threedimensional（3D） tubular QW infrared photodetectors（QWIPs）,which are based on the QW intersubband transition（ISBT）.A redshift of ～0.42 meV in photocurrent response spectra is observed and attributed to two strain contributions due to the rolling of the pre-strained *** is the overall strain that mainly leads to a redshift of ～0.5 meV,and the other is the strain gradient which results in a very tiny *** blue shift of the photocurrent response spectra with the external bias are also observed as quantum-confined Stark effect（QCSE）in the ISBT.

关键词： quantum well infrared photodetector rolled-up microtube strain Stark effect

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Shaping Thin Solid Films into Functional and Integrative Nanomembranes

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Shaping Thin Solid Films into Functional and Integrative Nan...

Hierarchically nanostructured nitrogen-doped porous carbon multilayer confining Fe particles for high performance hydrogen evolution

TFC'15全国薄膜技术学术研讨会

作者： yongfeng mei Department of Materials Science Fudan University

Recently,tremendous attention has been directed toward the thinningand shaping of solids into so-called nanomembranes,offering a unique and fantastic platform for research in nanoscience and *** this talk,a conceptual description of nanomembranes is introduced and a series of examples demonstrate their great potential for future *** thinning of nanomembranes indeed offers another strategy to fabricate nanomaterials,which can be integrated onto a chip and exhibit interesting ***,the stretching of nanomembranes enables a macroscale route for tuning the physical properties of the membranes at the *** process by which nanomembranes release from a substrate presents several approaches to shaping nanomembranes into three-dimensional architectures,such as rolled-up tubes,wrinkles,and the resulting channels,which can provide fascinating applications in electronics,mechanics,fluidics,and *** as a new type of nanomaterial promise to be an attractive direction for nano-research as well as for flexible electronics.

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Journal of Materiomics 2023年第6期9卷 1113-1121页

作者： Ying Wang Li Jin Shiyang Hua Zhe Zhao Zhijia Xiao Chunyan Qu Jiayuan Huang Gaoshan Huang Xinyi Ke Zihan Lu Ji Tan Xuanyong Liu yongfeng mei College of Mathematics and Physics Shanghai University of Electric PowerShanghai200090China Department of Materials Science&State Key Laboratory of Molecular Engineering of Polymers Fudan UniversityShanghai200438China Shanghai Frontiers Science Research Base of Intelligent Optoelectronics and Perception Institute of OptoelectronicsFudan UniversityShanghai200438China International Institute of Intelligent Nanorobots and Nanosystems Fudan UniversityShanghai200438China Yiwu Research Institute of Fudan University Yiwu322000ZhejiangChina State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai200050China Wuhan Institute of Marine Electric Propulsion Wuhan430064China

Precise assembly of active component with sophisticated confinement in electrocatalyst are promising to increase the active site exposure for enhanced hydrogen evolution reaction(HER).Here,PCN-333 films with mesopores are firstly assembled on titanium carbide MXene with the assistance of atomic layer deposited oxide *** the whereafter pyrolysis process,the composite is converted to Ndoped porous carbon multi-layer containing Fe *** strong confinement of Fe active particle in carbon as well as great contact between metal and carbon effectively enhance active site ***,this multi-layer porous structure provides high specific surface area and plentiful mesopores for electrolyte *** to the structural advantage,the composite can be well functioned in both acid and alkaline electrolytes with excellent HER performance,e.g.,low overpotential/Tafel *** present work may have great potential in developing high efficiency transition-metal based electrocatalysts.

关键词： Hierarchical nanostructure Metal organic framework MXene Atomic layer deposition Hydrogen evolution reaction

Artificial neuron synapse transistor based on silicon nanomembrane on plastic substrate

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Journal of Semiconductors 2017年第6期38卷 79-83页

作者： Minjie Liu Gaoshan Huang Ping Feng Qinglei Guo Feng Shao Ziao Tian Gongjin Li Qing Wan yongfeng mei Department of Materials Science Fudan University School of Electronic Science and Engineering and Collaborative Innovation Center of Advanced Microstructures Nanjing University

Silicon nanomembrane（SiNM）transistors gated by chitosan membrane were fabricated on plastic substrate to mimic synapse *** device has both a bottom proton gate（BG）and multiple side gates（SG）.Electrical transfer properties of BG show hysteresis curves different from those of typical SiO2 gate *** behaviors and functions by linear accumulation and release of protons have been mimicked on this device：excitatory post-synaptic current（EPSC）and paired pulse facilitation behavior of biological synapses were mimicked and the paired-pulse facilitation index could be effectively tuned by the spike interval applied on the *** behaviors and functions,including short-term memory and long-term memory,were also experimentally demonstrated in BG ***,spiking logic operation and logic modulation were realized in SG mode.

关键词： silicon nanomembrane chitosan membrane excitatory post-synaptic current

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