Query: graphene fiber structure application source:SCI

title: Hierarchical core shell fibers of graphene fiber/radially aligned molybdenum disulfide nanosheet arrays for highly efficient energy storage
abstract: Flexible fiber shaped supercapacitors have broad application prospects in wearable and portable electronics and smart textiles, however, often suffered from their relatively low capacitance and energy density. In this paper, a unique core shell fiber composed of graphene fiber and radially aligned molybdenum disulfide nanosheet arrays (GF/MoS2) has been rationally designed and prepared. The morphology and structure of well designed core shell fibers were studied by Raman, X ray diffraction (XRD) scanning electron microscope (SEM) and energy dispersive x ray spectroscopic (EDX) elemental mapping. All solid state, fiber shaped symmetric supercapacitors were constructed by packaging two parallel GF/MoS2 core shell fibers with PVA/H2SO4 electrolyte. Owing to the synergistic effects between graphene and MoS2, the fiber shaped supercapacitor exhibits an enhanced areal capacitance up to 189.73 mF cm 2 and a high energy density of 14.665 mW h cm 2. The fibrous supercapacitors also exhibit good stability and flexibility. This work provides a strategy to design core shell fibrous electrodes for high performance fiber shaped supercapacitors, which also holds great potential for future flexible electronic devices.

title: Functionalized graphene fiber modified by dual nanoenzyme: Towards high performance flexible nanohybrid microelectrode for electrochemical sensing in live cancer cells
abstract: The development of flexible miniaturized electrochemical sensors based on functionalized microelectrode systems has gained numerous attentions for their promising application in potable, implantable and wearable medical devices. In this work, we report a facile strategy to construct a new type of high performance microelectrode based on wet spinning graphene fiber (GF) functionalized by dual nanoenzyme composed of ultrafine Au nanoparticles (Au NPs) wrapped flower like MnO2 nanowires (MnO2 NWs) assembly (MnO2 NWs@Au NPs) and explore its practical application in electrochemical detection of biomarker hydrogen peroxide (H2O2) released from live cancer cells. Benefiting from the advantage of the unique hierarchical nanohybrid structure and dual nanoenzyme activity, the resultant MnO2 NWs@Au NPs modified GF microelectrode shows superior catalytic activity towards the electrochemical redox reaction of H2O2. When used in amperometric detection of H2O2, the nanohybrid microelectrode exhibits high sensitivity and selectivity as well as good mechanical stability and biocompatibility, and can be used in real time in situ detection of H2O2 released from human breast cancer cells, which contributes to the development of high performance hierarchically nanostructured microelectrode in electrochemical sensing system for sensitive detection of various targets in biological samples.

title: Nickel Graphene Nanoplatelet Deposited on Carbon Fiber as Binder Free Electrode for Electrochemical Supercapacitor Application
abstract: A binder free process for the electrode preparation for supercapacitor application was suggested by drop casting graphene nanoplatelets on a carbon fiber (GnP@CF) followed by electrodeposition of Ni nanoparticles (NPs) The microstructure of the electrode showed that Ni was homogeneously distributed over the surface of the GnP@CF. XRD analysis confirmed the cubic structure of metallic Ni NPs. The Ni GnP@CF electrode showed excellent pseudocapacitive behavior in alkaline solution by exhibiting a specific capacitance of 480 F/g at 1.0 A/g, while it was 375 F/g for Ni@CF. The low value of series resistance of Ni GnP@CF (1 O) was attributed to the high capacitance. The enhanced capacitance of the electrode could be correlated to the highly nanoporous structure of the composite material, synergetic effect of the electrical double layer charge storage properties of graphene, and the pseudocapacitive nature of Ni NPs.

title: A novel periodically tapered structure based gold nanoparticles and graphene oxide Immobilized optical fiber sensor to detect ascorbic acid
abstract: This work presents a study, analysis, design, and characterization of a localized surface plasmon resonance (LSPR) based ascorbic acid (AA) sensor with improved sensitivity compared to those already reported. Various multi tapered (four, five, and eight tapered) optical fiber sensors (OFSs) have been developed and characterized in this study. Along with these, different nanomaterials (NMs) such as gold nanoparticles (AuNPs) and graphene oxide (GO) are immobilized over the bare probe. Further, NMs immobilized probes are functionalized with ascorbate oxidase. The AuNPs are well studied in the past with the variation in size, shape and surface functionalization and have been found to be well suited NMs for biosensing applications. On the other hand, GO based material is equally promising in the nanostructure based optical sensing due to their broad surface area, high electrical conductivity, good chemical stability, and excellent mechanical behavior. The performance parameters of the proposed sensor, such as sensitivity (8.3 nm/mM) correlation correlator (0.9724) and limit of detection (51.94 uM) are greatly improved over the previous designs. A wide range of characterization and validation of NMs immobilized structures are reported here. It indicates a great potential in the practical implementation of LSPR based OFSs for routine diagnostics.

title: Laser induced graphene enabled 1D fiber electronics
abstract: Laser induced graphene (LIG) is a newly emergent processing strategy for assembling graphene based structures and devices with low cost, high efficiency and high customizability. However, with the limitation of positioning accuracy, the application of LIG for swift and continuous production of 1D graphene fiber based electronics is still vacant. Considering the unique 1D geometry with prominent advantages for flexible and wearable devices, in this work, we adventurously proposed and investigated a vertically oriented laser sweeping strategy to continuously convert the ~16.5 mm diameter polyimide monofilament into freestanding graphene fibers. Based on process structure property relationship modulated precisely by varied combinations of lasing power and pulse resolution, the LIG enabled fiber electronics (LIGFE) could simultaneously exhibit small diameter

title: Synthesis of nitrogen superdoped and graphene fiber supported three dimensional graphene foam for supercapacitors
abstract: Nitrogen doped three dimensional (3D) graphene foam (GF) has aroused tremendous interest for the supercapacitors (SCs) applications because of its unique properties. However, it is still confronting the challenges of facile preparation and the high N doping level. Here, by rolling a part of graphene planes into the fiber like scaffold to support other graphene sheets, we obtain high quality 3D GF. Followed by fluorination and N doping, N superdoped GF (NGF) with N content as high as 15.7 at. was successfully prepared. The combination of fiber supported 3D structure and high N level facilitate forming GF with large surface area, low internal resistance, good wettability, and sufficient active sites, which results in high performance SCs: The prepared NGF electrode has a high specific capacitance (320.0 F g 1 and 303.5 F g 1 in three and two electrode system, respectively) and a long cycle life (92.8% retention after 1000 cycles) as well, the NGF SC device has a high energy density (42.1 Wh kg 1 at 250 W kg 1

title: Emerging 2D materials beyond graphene for ultrashort pulse generation in fiber lasers.
abstract: Ultrafast fiber lasers have significant applications in ultra precision manufacturing, medical diagnostics, medical treatment, precision measurement and astronomical detection, owing to their ultra short pulse width and ultra high peak power. Since graphene was first explored as an optical saturable absorber for passively mode locked lasers in 2009, many other 2D materials beyond graphene, including phosphorene, antimonene, bismuthene, transition metal dichalcogenides (TMDs) topological insulators (TIs) metal organic frameworks (MOFs) and MXenes, have been successively explored, resulting in rapid development of novel 2D materials based saturable absorbers. Herein, we review the latest progress of the emerging 2D materials beyond graphene for passively mode locked fiber laser application. These 2D materials are classified into mono elemental, dual elemental and multi elemental 2D materials. The atomic structure, band structure, nonlinear optical properties, and preparation methods of 2D materials are summarized. Diverse integration strategies for applying 2D materials into fiber laser systems are introduced, and the mode locking performance of the 2D materials based fiber lasers working at 1 3 mm are discussed. Finally, the perspectives and challenges facing 2D materials based mode locked fiber lasers are highlighted.

title: Three Dimensional Porous Carbon Nanotubes/Reduced Graphene Oxide Fiber from Rapid Phase Separation for a High Rate All Solid State Supercapacitor.
abstract: Graphene fiber based supercapacitors (SCs) are rising as having the greatest potential for portable/wearable energy storage devices. However, their rate performance is not well pleasing, which greatly impedes their broad practical applications. Herein, three dimensional porous carbon nanotube/reduced graphene oxide fibers were prepared by a nonsolvent induced rapid phase separation method followed by hydrazine vapor reduction. Benefitting from their three dimensional porous structure, large specific surface area, and high conductivity, the fabricated SC exhibits a high volume capacitance of 54.9 F cm 3 and high energy and power densities (4.9 mW h cm 3 and 15.5 W cm 3, respectively) Remarkably, the SC works well at a high scan rate of 50 V s 1 and shows a fast frequency response with a short time constant of 78 ms. Furthermore, the fiber shaped SC also exhibits very stable electrochemical performances when it is subjected to mechanical bending and succeeding straightening process, indicating its great potential application in flexible electronic devices.

title: Nitrogen doped graphene fiber webs for multi battery energy storage.
abstract: Freestanding carbon based electrodes with large surface areas and pore volumes are essential to fast ion transport and long term energy storage. Many of the current porous carbon substrates are composed of particulates, making it difficult to form a self supported structure. Herein, novel highly porous nitrogen doped graphene fiber webs (N GFWs) are prepared using a facile wet spinning method. The wet chemical process facilitates simultaneous N doping and surface wrinkling of graphene fibers in a one pot process. The atomic structure and electrical conductivity of N GFWs are tailored by tuning the degree of N doping and thermal reduction for multi battery charge storage in both lithium oxygen batteries (LOBs) and lithium sulfur batteries (LSBs) The N GFW900 electrode presents an excellent electrocatalytic activity and the cathode with a high areal loading of 7.5 mg cm 2 delivers a remarkable areal capacity of 2 mA h cm 2 at 0.2 mA cm 2 for LOBs. The N GFW700 interlayer with abundant oxygenated and nitrogen functional groups demonstrates effective entrapment of polysulfides in LSBs, delivering a much improved specific capacity after 200 cycles at 0.5C with a remarkable decay rate of 0.04% The current approach paves the way for rational design of porous graphene based electrodes, satisfying multifunctional requirements for high energy storage applications.

title: Ultrahigh Resolution Thickness Measurement Technique Based on a Hollow Core Optical Fiber Structure
abstract: An ultrahigh resolution thickness measurement sensor was proposed based on a single mode hollow core single mode (SMF HCF SMF) fiber structure by coating a thin layer of material on the HCF surface. Theoretical analysis shows that the SMF HCF SMF fiber structure can measure coating thickness down to sub nanometers. An experimental study was carried out by coating a thin layer of graphene oxide (GO) on the HCF surface of the fabricated SMF HCF SMF fiber structure. The experimental results show that the fiber sensor structure can detect a thin layer with a thickness down to 0.21 nanometers, which agrees well with the simulation results. The proposed sensing technology has the advantages of simple configuration, ease of fabrication, low cost, high resolution, and good repeatability, which offer great potential for practical thickness measurement applications.