共查询到20条相似文献，搜索用时 0 毫秒
1.
Carbon Nanohybrids: Hydrophilic Nanotube Supported Graphene–Water Dispersible Carbon Superstructure with Excellent Conductivity (Adv. Funct. Mater. 10/2015) 
下载免费PDF全文
下载免费PDF全文 Vasilios Georgakilas Athanasios Demeslis Evangelos Ntararas Antonios Kouloumpis Konstantinos Dimos Dimitrios Gournis Mikuláš Kocman Michal Otyepka Radek Zbořil 《Advanced functional materials》2015,25(10):1473-1473
2.
3.
Shuiren Liu Junpeng Li Xinlei Shi Enlai Gao Zhiping Xu Honghao Tang Kwing Tong Qibing Pei Jiajie Liang Yongsheng Chen 《Advanced Electronic Materials》2017,3(7):1700098
It is reported that graphene oxide (GO) can work as the dispersing, associate thickening, stabilizing, adhesive, oxidation-resistant, and mechanical reinforcing agents simultaneously to formulate a drawable conductive ink with silver nanowire (AgNW). The synergistic effect of combining AgNW with GO can bring forth the AgNW-GO dynamic network, which imparts appropriate viscosity and rheological property to the ink for reliable rollerball-pen drawing on paper and plastic substrates and enables the drawn conductive traces to simultaneously possess high conductivity, remarkable foldability, and stability. The electrical conductivity of the rollerball-pen drawn electrodes with mild post-treatment condition by drying at 25 °C for ≈5 min after writing on paper can achieve 2.3 × 104 S cm−1. The drawn electrodes are used as extremely foldable electrodes that can retain a record high conductivity of 1.4 × 104 S cm−1 after 1000 folding–unfolding cycles. The feasibility of the drawable conductive ink is further demonstrated by fabricating paper-based conductive circuits and a capacitive touch screen sensor with outstanding foldability. 相似文献
4.
Moumita Kotal Jaehwan Kim Rassoul Tabassian Sandipan Roy Van Hiep Nguyen Nikhil Koratkar Il‐Kwon Oh 《Advanced functional materials》2018,28(34)
Electrically responsive ionic soft actuators that can exhibit large bending strain under low electrical input power are promising candidates for future soft electronics and wearable devices. However, some drawbacks such as low blocking force, slow response time, and poor durability should be overcome for practical engineering applications. Herein, this study reports defect‐engineered 3D graphitic carbon nitride (GCN) and nitrogen‐doped graphene (NG) hetero‐nanostructure that were developed by one‐pot hydrothermal method in order to design functionally antagonistic hybrid electrodes for superior ionic soft actuators. While NG facilitates rapid electron transfer in 3D networked nanoarchitectures, the enriched‐nitrogen content in GCN provides good wettability and mechanical resiliency with poly(3,4 ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS). The 3D hybrid nanostructures generate unimpeded ion channels and sufficient contact area with the electrolyte membrane to provide higher capacitance and mechanical integrity, which are critical prerequisites for high‐performance actuation. The developed soft actuator based on the nitrogen‐enriched 3D hetero‐nanostructure is found to exhibit large bending strain (0.52%), wide frequency response, 5 h durability (93% retention), 2.4 times higher bending displacement, and twofold higher electromechanical efficiency compared to PEDOT:PSS under ±0.5 V input voltage. Such 3D functionally antagonistic hybrid electrodes offer hitherto unavailable opportunities in developing ultralow voltage‐driven ionic actuators for the next‐generation soft electronics. 相似文献
5.
Na Liu Fang Luo Haoxi Wu Yinghui Liu Chao Zhang Ji Chen 《Advanced functional materials》2008,18(10):1518-1525
Graphite, inexpensive and available in large quantities, unfortunately does not readily exfoliate to yield individual graphene sheets. Here a mild, one‐step electrochemical approach for the preparation of ionic‐liquid‐functionalized graphite sheets with the assistance of an ionic liquid and water is presented. These ionic‐liquid‐treated graphite sheets can be exfoliated into functionalized graphene nanosheets that can not only be individuated and homogeneously distributed into polar aprotic solvents, but also need not be further deoxidized. Different types of ionic liquids and different ratios of the ionic liquid to water can influence the properties of the graphene nanosheets. Graphene nanosheet/polystyrene composites synthesized by a liquid‐phase blend route exhibit a percolation threshold of 0.1 vol % for room temperature electrical conductivity, and, at only 4.19 vol %, this composite has a conductivity of 13.84 S m−1, which is 3–15 times that of polystyrene composites filled with single‐walled carbon nanotubes. 相似文献
6.
Yaling Wang Yan Zhang Guolong Wang Xiaowei Shi Yide Qiao Jiamei Liu Heguang Liu Anandha Ganesh Lei Li 《Advanced functional materials》2020,30(16)
The advancement of miniaturized electronic devices requires the development of high‐performance microsupercapacitors. The low areal energy density of microsupercapacitors with the interdigitated architecture is the major challenge hindering the application. Here, a simple method for the scalable fabrication of all‐solid‐state, flexible microsupercapacitors is demonstrated by direct graphene‐carbon nanotube composite ink writing technology. The microsupercapacitors demonstrate good electrochemical performance with a high areal energy density of 1.36 µWh cm–2 and power density of 0.25 mW cm–2, good cycling stability, and excellent mechanical flexibility. The method developed here sheds light on the simple method of preparing high‐performance, all‐solid‐state, flexible microsupercapacitors in a straightforward and scalable process. 相似文献
7.
MinHo Yang Bong Gill Choi Sung Chul Jung Young‐Kyu Han Yun Suk Huh Sang Bok Lee 《Advanced functional materials》2014,24(46):7301-7309
The integration of electrical double‐layer capacitive and pseudocapacitive materials into novel hybrid materials is crucial to realize supercapacitors with high energy and power densities. Here, high levels of energy and power densities are demonstrated in supercapacitors based on a new type of nanohybrid electrode consisting of polyoxometalate (POM)‐coupled graphene in which a polymeric ionic liquid (henceforth simply PIL) serves as an interfacial linker. The adoption of PIL in the construction of nanohybrids enables a uniform distribution of discrete POM molecules along with a large surface area of graphene sheets. When testing electrochemical characteristics under a two‐electrode system, as‐prepared supercapacitors exhibit a high specific capacitance (408 F g?1 at 0.5 A g?1), rapid rate capability (92% retention at 10 A g?1), a long cycling life (98% retention during 2000 cycles), and high energy (56 Wh kg?1) and power (52 kW kg?1) densities. First‐principles calculations and impedance spectroscopy analysis reveal that the PILs enhance the redox reactions of POMs by providing efficient ion transfer channels and facilitating the charge transfer in the nanohybrids. 相似文献
8.
Lei Wang Jiayao Fan Ying Liu Mingyu Chen Yue Lin Hengchang Bi Bingxue Liu Naien Shi Dongdong Xu Jianchun Bao Min Han 《Advanced functional materials》2021,31(30):2010912
Transition metal phosphides (TMPs) nanostructures have emerged as important electroactive materials for energy storage and conversion. Nonetheless, the phase modulation of iron/nickel phosphides nanocrystals or related nanohybrids remains challenging, and their electrocatalytic overall water splitting (OWS) performances are not fully investigated. Here, the phase-controlled synthesis of iron/nickel phosphides nanocrystals “armored” with porous P-doped carbon (PC) and anchored on P-doped graphene (PG) nanohybrids, including FeP–Fe2P@PC/PG, FeP–(NixFe1-x)2P@PC/PG, (NixFe1-x)2P@PC/PG, and Ni2P@PC/PG, are realized by thermal conversion of predesigned supramolecular gels under Ar/H2 atmosphere and tuning Fe/Ni ratio in gel precursors. Thanks to phase-modulation-induced increase of available catalytic active sites and optimization of surface/interface electronic structures, the resultant pure-phase (NixFe1-x)2P@PC/PG exhibits the highest electrocatalytic activity for both hydrogen and oxygen evolution in alkaline media. Remarkably, using it as a bifunctional catalyst, the fabricated (NixFe1-x)2P@PC/PG || (NixFe1-x)2P@PC/PG electrolyzer needs exceptional low cell voltage (1.45 V) to reach 10 mA cm−2 water-splitting current, outperforming its mixed phase and monometallic phosphides counterparts and recently reported bifunctional catalysts based devices, and Pt/C || IrO2 electrolyzer. Also, such (NixFe1-x)2P@PC/PG || (NixFe1-x)2P@PC/PG device manifests outstanding durability for OWS. This work may shed light on optimizing TMPs nanostructures by combining phase-modulation and heteroatoms-doped carbon double-confinement strategies, and accelerate their applications in OWS or other renewable energy options. 相似文献
9.
Zhiqiang Su Huiyan Shen Haixia Wang Jinhui Wang Jingfeng Li Gerd Ulrich Nienhaus Li Shang Gang Wei 《Advanced functional materials》2015,25(34):5472-5478
Nanohybrids based on biomolecular nanostructures and graphene quantum dots (GQDs) have found wide application in the biological and biomedical fields. Herein, the design of a peptide with trifunctional motifs is reported as the precursor building block for constructing a novel multifunctional protein nanofiber (PNF), and further conjugated with highly fluorescent GQDs by noncovalent interactions. The physicochemical properties of these PNF–GQD nanohybrids are thoroughly characterized by a variety of spectroscopic and microscopic techniques, revealing that the GQDs essentially maintain their favorable optical properties in the nanohybrids. A good biocompatibility of the PNF–GQD nanohybrids is found with cell viability assays. With both, a recognition moiety (RGD) and an imaging probe (GQD), these PNF–GQD nanohybrids possess the capability of targeting and imaging tumor cells simultaneously. A potential application of these novel nanohybrids, i.e., fluorescence imaging of HeLa tumor cells, has been investigated by confocal fluorescence microscopy, which shows much enhanced labeling efficiency compared with GQDs only. Moreover, cellular internalization by nontumorous COS‐7 cells was much weaker than by HeLa cells. Our results show that GQD‐decorated PNF nanohybrids have great potential as multifunctional platforms for biomedical applications, particularly, where the capability of sensitive tracking and efficient labeling is appreciated. 相似文献
10.
Kirill Arapov Eric Rubingh Robert Abbel Jozua Laven Gijsbertus de With Heiner Friedrich 《Advanced functional materials》2016,26(4):586-593
This paper describes the gelation of highly concentrated graphene/polymer dispersions triggered by mild heating. The gel formation is only dependent on the concentration of graphene with 3.25 mg mL?1 as the minimum value for graphene network formation. The graphene gel is then utilized for the preparation of colloidally stable and highly concentrated (52 mg mL?1) graphene pastes that demonstrate excellent performance in screen printing down to lines of 40 μm in width. Printed patterns dried at 100 °C for only 5 min exhibit sheet resistances of 30 Ω ?1 at 25 μm thickness, thus, removing the need for long‐time high temperature annealing, doping, or other treatments. Such a low drying temperature, high printing definition, and compatibility with industrially relevant plastic and paper substrates brings high‐volume roll‐to‐roll application in printed flexible electronics within reach. 相似文献
11.
《Advanced Electronic Materials》2018,4(8)
Flexible printed all‐solid‐state graphene‐based planar supercapacitors have attracted great attentions for their potential applications in portable and wearable electronics. However, the limited ion accessible surface area and slow ion diffusion rate lead to low specific capacitance and poor rate performance. Increasing the diffussion of polyvinyl alcohol (PVA)‐based gel electrolyte into the printed graphene microelectrodes is a great challenge for improving its energy storage. In this work, the hydrophilic N‐doped graphene combining with the PVA‐H3PO4 gel electrolyte is attempted to assemble to a stabilized water‐soluble graphene@PVA‐H3PO4 hybrid ink formulation for gravure‐printed planar supercapacitors. Through optimizing the ink properties and investigating the physical interaction between the ink and gravure cells, graphene@PVA‐H3PO4 microelectrodes are successfully gravure printed. The improved accessibility of electrolyte ions to the active surfaces of graphene in the printed microelectrodes leads to the enhanced electrochemical performance of the flexible planar supercapacitors. The increased areal capacitance of 37.5 mF cm−2 is achieved at a scan rate of 5 mV s−1. The maximum energy density of 5.20 µWh cm−2 is obtained at the areal power density of 3.2 mW cm−2, corresponding to a volumetric energy density of 2.08 mWh cm−3. 相似文献
12.
Jennifer L. Bento Elizabeth Brown Steven J. Woltornist Douglas H. Adamson 《Advanced functional materials》2017,27(1)
Thermodynamically‐driven exfoliation and self‐assembly of pristine graphene sheets is shown to provide thermally and electrically functional polymer composites. The spreading of graphene sheets at a high energy liquid/liquid interface is driven by lowering the overall energy of the system, and provides for the formation of water‐in‐oil emulsions stabilized by overlapping graphene sheets. Polymerization of the oil phase, followed by removal of the dispersed water phase, produces inexpensive and porous composite foams. Contact between the graphene‐stabilized water droplets provides a pathway for electrical and thermal transport through the composite. Unlike other graphene foams, the graphite used to synthesize these composites is natural flake material, with no oxidation, reduction, sonication, high temperature thermal treatment, addition of surfactants, or high shear mixing required. The result is an inexpensive, low‐density material that exhibits Joule heating and displays increasing electrical conductivity with decreasing thermal conductivity. 相似文献
13.
Qingyu Ye Xinzhao Xu Alessandro Paghi Thomas Bamford Benjamin R Horrocks Andrew Houlton Giuseppe Barillaro Stoichko Dimitrov Matteo Palma 《Advanced functional materials》2021,31(45):2105719
Here, the formation of carbon nanotube (CNT)-based nanohybrids in aqueous solution is reported, where DNA-wrapped CNTs (DNA-CNTs) act as templates for the growth of PbS and CdS nanocrystals, toward the formation of PbS-DNA-CNT and CdS-DNA-CNT heterostructures. Solution-processed multiplexed photoresponsive devices are fabricated from these nanohybrids, displaying a sensitivity to a broad range of illumination wavelengths (405, 532, and 650 nm). The DNA-CNT and CdS-DNA-CNT devices show a drop in the current while PbS-DNA-CNT's current increases upon light illumination, indicating a difference in the operational mechanisms between the hybrids. Furthermore, the ON/OFF photoresponse of PbS-DNA-CNT is only 1 s as compared to 200 s for the other two nanohybrid devices. The mechanisms of the different photoresponses are investigated by comparing the performance under an inert and air atmosphere, and gate dependence device analysis and transient absorption spectroscopy measurements are also conducted. The results reveal that photoinduced oxygen desorption is responsible for the slower photoresponse by DNA-CNT and CdS-DNA-CNT, while photoinduced charge transfer dominates the much faster response of PbS-DNA-CNT devices. The strategy developed is of general applicability for the bottom-up assembly of CNT-based nanohybrid optoelectronic systems and the fabrication of solution-processable multiplexed devices. 相似文献
14.
Mengting Chen Ling Zhang Shasha Duan Shilong Jing Hao Jiang Chunzhong Li 《Advanced functional materials》2014,24(47):7548-7556
Here, a novel and facile method is reported for manufacturing a new stretchable conductive material that integrates a hybrid three dimensional (3D) carbon nanotube (CNT)/reduced graphene oxide (rGO) network with a porous poly(dimethylsiloxane) (p‐PDMS) elastomer (pPCG). This reciprocal architecture not only alleviates the aggregation of carbon nanofillers but also significantly improves the conductivity of pPCG under large strains. Consequently, the pPCG exhibits high electrical conductivity with a low nanofiller loading (27 S m?1 with 2 wt% CNTs/graphene) and a notable retention capability after bending and stretching. The simulation of the mechanical properties of the p‐PDMS model demonstrates that an extremely large applied strain (εappl) can be accommodated through local rotations and bending of cell walls. Thus, after a slight decrease, the conductivity of pPCG can continue to remain constant even as the strain increases to 50%. In general, this architecture of pPCG with a combination of a porous polymer substrate and 3D carbon nanofiller network possesses considerable potential for numerous applications in next‐generation stretchable electronics. 相似文献
15.
16.
Wei Zhang Yikang Zhou Kun Feng Josh Trinidad Aiping Yu Boxin Zhao 《Advanced Electronic Materials》2015,1(11)
In order to develop functional nanostructures with controllable size, composition, morphology, and interface, a series of dopamine (DA) modified polypyrrole (PPy) nanostructures that have tunable electrical conductivity and improved water dispersibility are prepared. The DA‐PPy nanostructures exhibit various morphologies, including nanosphere, nanofiber, nanorod, and nanoflake; and all of these nanostructures can be achieved by simply varying the DA/Py reacting mole ratio. Furthermore, the potential application of each as‐fabricated DA‐PPy, which depend on their tunable electrical properties, are explored. In particular, DA‐PPy resulting from a 0.032 dopamine/pyrrole (DA/Py) mole ratio demonstrate superior capacitance for supercapacitors; at DA/Py = 0.064, DA‐PPy can be implemented as a co‐filler into the epoxy network to prepare hybrid electrically conductive adhesives and DA‐PPy synthesized from 0.64 DA/Py mole ratio reveals impressive electromagnetic microwave absorption ability that can be used for electromagnetic interference shielding applications. Due to the synergetic effects of DA and electrically conductive polymer PPy, this one‐step procedure represents a promising protocol to control the syntheses and properties of nanomaterials for applications in advanced electronic devices. 相似文献
17.
18.
19.
20.
Yuqing Liu Binbin Zhang Qun Xu Yuyang Hou Shayan Seyedin Si Qin Gordon G. Wallace Stephen Beirne Joselito M. Razal Jun Chen 《Advanced functional materials》2018,28(21)
Extrusion printing of interdigitated electrodes for flexible microsupercapacitors (fMSCs) offers an attractive route to the fabrication of flexible devices where cost, scalability, and processability of ink formulations are critical. In this work, highly concentrated, viscous, and water‐dispersible inks are developed based on graphene oxide (GO)/polyaniline (PANi) composite for extrusion printing. The optimized GO/PANi‐based all‐solid‐state symmetric fMSCs obtained by extrusion printing interdigitated microelectrodes can deliver outstanding areal capacitance of 153.6 mF cm?2 and volumetric capacitance of 19.2 F cm?3 at 5 mV s?1. It is shown that by fabricating asymmetric fMSCs using the GO/PANi as positive electrode and a graphene‐based negative electrode, the voltage window can be widened from 0.8 to 1.2 V and improvements can be achieved in energy density (from 3.36 to 4.83 mWh cm?3), power density (from 9.82 to 25.3 W cm?3), and cycling stability (from 75% to 100% capacitance retention over 5000 cycles) compared with the symmetric counterpart. The simple ink preparation and facile device fabrication protocols reported here make the scalable fabrication of extrusion printed fMSCs a promising technology. 相似文献