共查询到20条相似文献，搜索用时 31 毫秒
1.
Jun Huang Liu Wang Yuming Jin Peng Lu Lin‐Lin Wang Ningning Bai Gang Li Pang Zhu Yan Wang Jianming Zhang Zhigang Wu Chuan Fei Guo 《Advanced functional materials》2020,30(23)
The transfer of stretchable electrodes or devices from one substrate to another thin elastomer is challenging as the elastic stamp often yields a huge strain beyond the stretchability limit of the electrodes at the debonded interface. This will not happen if the stamp is rigid. However, a rigid material cannot be used as the substrate for stretchable electrodes. Herein, silk fibroin with tunable rigidity (Young's modulus can be changed from 134 kPa to 1.84 GPa by controlling the relative humidity) is used to transfer highly stretchable metal networks as highly conformable epidermal electrodes. The silk fibroin stamp is tuned to be rigid during peeling, and then be soft and highly stretchable as a substrate when laminated on moisturized human skin. In addition, the epidermal electrodes exhibit no skin irritation or inflammation after attaching for over 10 d. The high compliance results in a lower interface impedance and lower noises of the electrode in measuring electromyographic signals, compared with commercial Ag‐AgCl gel electrodes. The strategy of tuning the rigidity at different stages of transfer is a general method that can be extended to the transfer of other stretchable electrodes and devices for epidermal electronics, human machine interfaces, and soft robotics. 相似文献
2.
3.
Min D. Tang‐Schomer Xiao Hu Marie Hronik‐Tupaj Lee W. Tien Michael J. Whalen Fiorenzo G. Omenetto David L. Kaplan 《Advanced functional materials》2014,24(13):1938-1948
Neural engineering provides promise for cell therapy by integrating the host brain with brain–machine‐interface technologies in order to externally modulate functions. Long‐term interfaces with the host brain remain a critical challenge due to insufficient graft cell survivability and loss of brain electrode sensitivity over time. Here, integrated neuron–electrode interfaces are developed on thin flexible and transparent silk films as brain implants. Mechanical properties and surface topography of silk films are optimized to promote cell survival and alignment of primary rat cortical cells. Compartmentalized neural cultures and co‐patterned electrode arrays are incorporated on the silk films with built‐in wire connections. Electrical stimulation via electrodes embedded in the films activated surrounding neurons to produce evoked calcium responses. In mice brains, silk film implants show conformal contact capable of modulating host brain cells with minimal inflammatory response and stable indwelling for weeks. The approach of combining cell therapy and brain electrodes could provide sustained functional interfaces with ex vivo control with spatial precision. 相似文献
4.
5.
《Advanced functional materials》2018,28(39)
Carbon electrode are a low‐cost and great potential strategy for stable perovskite solar cells (PSCs). However, the efficiency of carbon‐based PSCs lags far behind compared with that of state‐of‐the‐art PSCs. The poor interface contact between the carbon electrode and the underlying layer dominates the performance loss of the reported carbon‐based PSCs. In this respect, a sort of self‐adhesive macroporous carbon film is developed as counter electrode by a room‐temperature solvent‐exchange method. Via a simple press transfer technique, the carbon film can form excellent interface contact with the underlying hole transporting layer, remarkably beneficial to interface charge transfer. A power conversion efficiency of up to 19.2% is obtained for mesoporous‐structure PSCs, which is the best achieved for carbon‐based PSCs. Moreover, the device exhibits greatly improved long‐term stability. It retains over 95% of the initial efficiency after 1000 h storage under ambient atmosphere. Furthermore, after aging for 80 h under illumination and maximum power point in nitrogen atmosphere, the carbon‐based PSC retains over 94% of its initial performance. 相似文献
6.
Alessio Bucciarelli Silvia Chiera Alberto Quaranta Vamsi K. Yadavalli Antonella Motta Devid Maniglio 《Advanced functional materials》2019,29(42)
Solid fibroin is a bulk nonporous material that can be prepared with two methods: a liquid–gel–solid transition from a fibroin solution or a sintering procedure starting from silk powder. Both methods have their own disadvantages: the first requires several weeks and the process is size dependent; the second requires high temperatures. To overcome these limitations, a low‐temperature sintering procedure based on a thermal‐reflow is proposed in this work to produce in fast‐fashion monoliths of solid fibroin. Thermal‐reflow is a well‐known mechanism that takes place when the glass transition temperature of the material is lower than the temperature used to process it. Water plays an important role decreasing the glass transition temperature down to 40 °C. For the first time, a thermal reflow is conducted on lyophilized silk fibroin at 40 °C, associating to the water addition a high‐pressure compression. To optimize the process, a full factorial design of experiment is used. The material is then studied in the crucial phases by digital scanning calorimetry, Fourier‐transform infrared spectroscopy, and scanning electron microscopy. Finally, a mechanical characterization and a preliminary in vitro test are conducted. 相似文献
7.
Corinne R. Wittmer Thomas Claudepierre Michael Reber Peter Wiedemann Jonathan A. Garlick David Kaplan Christophe Egles 《Advanced functional materials》2011,21(22):4232-4242
The repair of central nerves remains a major challenge in regenerative neurobiology. Regenerative guides possessing critical features such as cell adhesion, physical guiding and topical stimulation are needed. To generate such a guide, silk‐protein materials are prepared using electrospinning. Silk is selected for this study due to its biocompatibility and its ability to be electrospun for the formation of aligned biofunctional nanofibers. The addition of brain‐derived neurotrophic factor (BDNF), ciliary neurotrophic factor (CNTF) or both to the electrospun fibers enables enhanced function without impact to the structure or the surface morphology. Only a small fraction of the loaded growth factors is released over time, allowing the fibers to continue to provide these factors to cells for extended periods. The entrapped factors remain active and available to the cells, as rat retinal ganglion cells (RGCs) exhibit longer axonal growth when in contact with the biofunctionalized fibers. Compared with unfunctionalized fibers, the growth of neurites increases 2‐fold on fibers containing BDNF, 2.5‐fold on fibers containing CNTF and almost 3‐fold on fibers containing both factors. The results demonstrate the potential of aligned and functionalized electrospun silk fibers to promote nerve growth in the central nervous system, underlying the great potential of complex biomaterials in neuroregenerative strategies following axotomy and nerve‐crush traumas. 相似文献
8.
CR Wittmer T Claudepierre M Reber P Wiedemann JA Garlick D Kaplan C Egles 《Advanced functional materials》2011,21(22):4202-4202
The repair of central nerves remains a major challenge in regenerative neurobiology. Regenerative guides possessing critical features such as cell adhesion, physical guiding and topical stimulation are needed. To generate such a guide, silk protein materials are prepared using electrospinning. The silk is selected for this study due to its biocompatibility and ability to be electrospun for the formation of aligned biofunctional nanofibers. The addition of Brain Derived Neurotrophic Factor (BDNF), Ciliary Neurotrophic Factor (CNTF) or both to the electrospun fibers enable enhanced function without impact to the structure or the surface morphology. Only a small fraction of the loaded growth factors is released over time allowing the fibers to continue to provide these factors to the cells for extended periods of time. The entrapped factors remain active and available to the cells as rat retinal ganglion cells (RGCs) exhibit longer axonal growth when in contact with the biofunctionalized fibers. Compare to non-functionalized fibers, the growth of neurites increased 2 fold on fibers containing BDNF, 2.5 fold with fibers containing CNTF and by almost 3-fold on fibers containing both factors. The results demonstrate the potential of aligned and functionalized electrospun silk fibers to promote nerve growth in the central nervous system, underlying the great potential of complex biomaterials in neuroregenerative strategies following axotomy and nerve crush traumas. 相似文献
9.
Tatjana Šafarik Aleksandar Karajić Stéphane Reculusa Philip N. Bartlett Nicolas Mano Alexander Kuhn 《Advanced functional materials》2023,33(7):2210638
Redox cycling (RC) is a powerful tool capable of amplifying faradaic currents in electroanalytical measurements, thus allowing an enhancement of sensitivity through fast multiple sequential oxidation and reduction reactions of a redox-active analyte. Present state-of-the-art RC devices are mostly based on planar electrode geometries either in 2D or 3D configurations, requiring cleanroom facilities and expensive microfabrication techniques. Here, the electrochemical elaboration and characterization of a 3D coaxial macroporous twin-electrode is reported, obtained by following a low-cost bottom-up approach. A nanoengineered highly organized porous material is the basis for the design of two threaded cylindrical porous gold microelectrodes with a gap in the micrometer range that can be fine-tuned. The potentials of the outer and inner electrodes are biased at values above and below the redox potential of the analyte so that a given molecule can participate several times in the electron exchange reaction by shuttling between both electrodes. The resulting signal amplification, combined with a straightforward synthesis strategy of the electrode architecture, allows envisioning numerous (bio)electroanalytical applications. 相似文献
10.
Byoung Soo Kim Hyowon Kwon Hyun Jeong Kwon Jun Beom Pyo Jinwoo Oh Soo Yeong Hong Jong Hyuk Park Kookheon Char Jeong Sook Ha Jeong Gon Son Sang‐Soo Lee 《Advanced functional materials》2020,30(21)
A commonly used strategy to impose deformability on conductive materials is the prestrain method, in which conductive materials are placed on prestretched elastic substrates and relaxed to create wavy or wrinkled structures. However, 1D metallic nanowire (NW) networks typically result in out‐of‐plane buckling defects and NW fractures, due to their rigid and brittle nature and nonuniform load transfer to specific points of NW. To resolve these problems, an alternative method is proposed to control the elastic modulus of 1D NW networks through contact with various solvents during compressive strain. Through solvent contact, the interface interactions between the NWs and between the NW and substrate can be controlled, and it is shown that the surface instability of the 1D random network is formed differently from a uniform bilayer film, which also can vary with the modulus of the network. For modulus values lower than the critical point, slippage and rearrangement of NW strands mainly occur and individual strands in the network show an in‐plane wavy configuration, which is ideal for structural stretchability. Based on the solvent‐assisted prestrain method, letter‐sized, large‐area stretchable, and transparent electrodes with high transparency and conductivity are achieved, and stretchable and transparent alternating current electroluminescent devices for stretchable display applications are also realized. 相似文献
11.
12.
Wontak Kim Tae Hyeon Kim Jisang Yu Young-Jun Kim Ki Jae Kim Hyun-seung Kim 《Advanced functional materials》2023,33(49):2306068
Individually functionalized cation- and anion-based ionic additives are designed to mitigate the interfacial side reaction occurring on both the positive and negative electrode surfaces. By applying 1-phenyl-1H-imidazole-3-ium trifluoromethanesulfonate as a surface-targeting electrolyte additive, the reciprocal failure from multiple electrolyte addition applications is theoretically prevented. Selective interface modification is performed using ionic additives by the migration of cations and anions to the negative and positive electrode surfaces, respectively. A drastic improvement in cycleability compared with that by a general carbonate electrolyte is achieved because the reinforcement of both the graphite and LiNi0.8Co0.1Mn0.1O2 electrode surface is possible by ionic additives. Moreover, a further improvement in the cycle performance compared with that by the typical solid electrolyte interphase-forming additives, such as vinylene carbonate and fluoroethylene carbonate, is demonstrated by the ionic additive. 相似文献
13.
大容量高储能密度电化学电容器的研究进展 总被引：9，自引：5，他引：4
综述了大容量、高储能密度的新型电容器——电化学电容器的原理、结构、特点及国内外的研究进展。目前 ,已有电化学电容器用于计算机备用电源、信号灯电源及需要大电流充放电的电源系统。 相似文献
14.
Xiaolong Li Rong Liu Chunyang Xu Yang Bai Xiaoming Zhou Yongji Wang Guohui Yuan 《Advanced functional materials》2018,28(22)
Flexible supercapacitors have potential for wearable energy storage due to their high energy/power densities and long operating lifetimes. High electrochemical performance with robust mechanical properties is highly desired for flexible supercapacitor electrodes. Usually, the mechanical properties are improved by choosing high flexible textile substrates but at the much expense of electrochemical performance due to the nonideal contact between conductive materials and textile substrates. Herein, the authors present an efficient, scalable, and general strategy for the simultaneous fabrication of high‐performance textile electrodes and yarn electrodes. It is interesting to find that the conformal reduced graphene oxide (RGO) layer is uniformly and successively painted on the surface of SnCl2 modified polyester fibers (M‐PEF) via a repeated “dyeing and drying” strategy. The large‐area textile electrodes and ultralong yarn electrodes are fabricated by using RGO/M‐PEF as substrate with subsequent deposition of polypyrrole. This work provides new opportunities for developing high flexible textile electrodes and yarn electrodes with further increased electrochemical performance and scalable production. 相似文献
15.
We investigated the highly flexible, transparent and very low resistance ZnS/1st Ag/ZnO/2nd Ag/WO3 (ZAZAW) multilayer electrodes on PET substrate as an anode in flexible organic light-emitting diodes (OLEDs). A theoretical calculation was first conducted to obtain the optimal thickness of the ZAZAW multilayer for high transparency. Its measured luminous transmittance was over 80% in the visible range with a very low sheet resistance of 2.17 Ω/sq., and it had good mechanical flexibility due to the ductility of Ag. Ag’s effect on optical and electrical properties was also studied. Flexible OLEDs devices that were fabricated on ZAZAW multilayer anode showed good hole injection properties comparable to those of ITO-based OLEDs due to the use of WO3 as a hole injection layer. However, the electroluminescent properties of the ZAZAW-based OLEDs varied depending on WO3 thickness. Although the transmittance of the ZAZAW electrode was reduced by tuning the WO3 thickness to adjust the microcavity effect, the device efficiency could be enhanced above that of ITO-based OLEDs. 相似文献
16.
17.
厚膜集成电路丝网印刷工艺技术 总被引：1，自引：0，他引：1
陈仲武 《电子工业专用设备》2002,31(1):48-50
重点介绍了厚膜集成电路的丝网印刷工艺技术和影响印刷质量的因素 ,并以厚膜电阻器为例 ,简述其制作工艺过程 ,以及丝网印刷缺陷对厚膜电路的影响 相似文献
18.
Liu Zulan Li Zhi Cheng Lan Chen Sihao Wu Dayang Dai Fangyin 《Advanced Electronic Materials》2019,5(4)
The desire for this lightweight and flexible electronics has grown increasingly, and the flexible and wearable electronic textiles can be realized by coating traditional textiles with conductive materials. Here, the conductive silk fabrics are prepared by coating graphene oxide (GO) onto silk fabrics and followed by thermal reduction. The scanning electron microscope results show that the GO coated onto silk fabrics successfully forms a continuous thin film. The oxygen functional groups are removed by thermal reduction. The main structure (β‐sheet structure) of silk fabrics is not destroyed through a series of treatment, guaranteeing good mechanical properties. The resistivity and conductivity of silk fabrics using regenerated silk fibroin as a glue can reach 3.28 KΩ cm−1, 3.06 × 10−4 S cm−1 respectively, which can meet the electron conductive requirement of wearable electronics. Thus, it can be used for sensors, portable devices, and wearable electronic textiles. 相似文献
19.
We introduce a simple methodology to integrate prefabricated nanostructured-electrodes in solution-processed organic photovoltaic (OPV) devices. The tailored “photonic electrode” nanostructure is used for light management in the device and for hole collection. This approach opens up new possibilities for designing photonically active structures that can enhance the absorption of sub-bandgap photons in the active layer. We discuss the design, fabrication and characterization of photonic electrodes, and the methodology for integrating them to OPV devices using a simple lamination technique. We demonstrate theoretically and experimentally that OPV devices using photonic electrodes show a factor of ca. 5 enhancement in external quantum efficiency (EQE) in the near infrared region. We use simulations to trace this observed efficiency enhancement to surface plasmon polariton modes in the nanostructure. 相似文献
20.
Wentao Gan Lianping Wu Yaoxing Wang He Gao Likun Gao Shaoliang Xiao Jiuqing Liu Yanjun Xie Teng Li Jian Li 《Advanced functional materials》2021,31(29):2010951
Using an inexpensive and eco-friendly wood substrate, herein, a one-step calcination method is developed to deposit Co-Ni binary nanoparticles into aligned wood channels and an effective carbonized wood (CW) electrode (termed as Co/Ni-CW) is fabricated. Well distributed Co-Ni nanoparticles are achieved by the coordination bonds between the hydroxyl groups on wood matrix and soaked metal cations. Subsequently, high-temperature calcination promotes the nucleation of Co-Ni nanoparticles and the formation of CW. With the uniform distribution of Co-Ni nanoparticles and porous wood structure, not only is a high active surface area, but also the electron and mass diffusion pathways are enhanced. Thus, the as-prepared Co/Ni-CW affords the current density of 10 mA cm–2 at low overpotentials of 330 and 157 mV for oxygen and hydrogen evolution, respectively. Remarkably, when the wood-based bifunctional electrocatalyst is used as both the anode and cathode, a low cell voltage of 1.64 V is required to reach the current density of 10 mA cm–2. Compared with most substrates used in bifunctional electrocatalysts, the abundance, low cost, eco-friendliness, and easy operation of wood-based catalysts allow for an active and scalable electrode for water splitting and many other energy storage devices. 相似文献