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Flexible fiber-shaped microelectrode biosensors have aroused intensive attention due to the promising use for monitoring personal healthcare. However, challenges still exist in the pursuit of combination of high sensitivity and selectivity. Herein, a facile and effective strategy to solve these problems was proposed by developing a novel fiber-shaped photoelectrochemical urea biosensor (PUB) based...
Vertically-aligned multi-walled carbon nanotubes (MWNTs) arrays were designed with different pattern spacings on silicon wafer and tunable three-dimensional (3D) surface-enhanced Raman scattering (SERS) substrates were fabricated by decorating the patterned MWNTs arrays with gold nanoparticles (AuNPs) via magnetron sputtering and annealing. SERS substrates with large amounts of “hot spots” were achieved...
Carbon nanotube (CNT)-inorganic hybrids have been extensively investigated due to their potential to become the next-generation materials for applications in energy and environment. However, the random dispersion of CNTs and the low-quality inorganic phases may hinder their use in flexible and multi-functional devices. Herein, we synthesize the multi-functional aligned CNT/titanium dioxide (TiO2)...
We introduce a facile approach to solder carbon nanotube (CNT) fibers by depositing carbon nanostructures at targeted fiber connections. Electrothermal induced deposition (ETID) process facilitates thermal chemical vapor deposition via current-induced Joule heating. Various carbon structures are formed between the overlapped fibers, with nanofibers covered by amorphous carbon and carbon nanowalls,...
Fast growing flexible and wearable electronics and devices require thermal management materials having not only high thermal conductivity but also structural flexibility with mechanical robustness. However, most developed thermal management materials are relatively rigid and have low strength. Herein, we report a carbon nanotube/graphene hybrid film that combines high thermal conductivity (up to 1056 W/(mK)),...
Carbon nanotube (CNT)-based composites are ideal materials for electrothermal applications because of their lightweight, excellent conductivity, heat sensitivity, and easy processability. In this study, high-performance electrothermal films were synthesized by a novel layer-by-layer method. Electrothermal films were prepared by pouring CNT solution into the designed mold and subsequent curing of thermoplastic...
The fabrication and performance of a novel continuous carbon nanotube (CNT) sheet reinforced polyvinylidene fluoride (PVDF) film with sandwich structure are firstly reported. Continuous CNT sheet fabricated by means of floating catalyst chemical vapor deposition was used. A dispersion-free technique for the sandwich composite film was adopted. For the prepared film with sandwich structure, CNT sheet/PVDF...
To remove dispersant molecules on the surface of single-walled carbon nanotubes (SWCNTs) is one of main challenges for its practical application in electronics. In this paper, we demonstrated a photodegradable process as a promising method to remove off the dispersants from the surface of semiconducting SWCNTs (s-SWCNTs). A N-heterocyclic aromatic compound, 1,2,5,6-Tetra(5-octylthiophene-2-yl)-Hexaazapentacene...
Electrical and thermal management in nanodevices by means of carbon nanotube is highly promising. One main challenge toward CNT-based nanoscale electrical and thermal management devices is the development of effective strategies for reducing the bundle–bundle interface resistance. Here we report a novel strategy, based on the densification of CNT bundles and the functionalization of inter-bundle interfaces...
An electromechanical response of the chemically reduced graphene oxide (rGO) fiber is reported. The rGO fiber has a tensile strength of 159 MPa, and an electrical conductivity of 170 S/cm. When a current is applied, an immediate load-drop, up to 82% of the original loading, can be observed. Such a load-drop is partially reversible when the current is withdrawn. Higher current density (5–20 mA) and...
To improve the mechanical performance and to develop multifunctionality, strengthening agents or functional nanoparticles are introduced into carbon nanotube (CNT) fibers. Here, a new post-spin treatment is realized for a high level of infiltration based on the vibration-induced loosening of CNT bundles. The vibration-assisted infiltration of terephthalic acid and bismaleimide improved the tensile...
Three-dimensional (3D) porous carbons with controlled mesopore and micropore structures were prepared through a simple and low-cost ultrasonic and impregnation assisted method from waste air-laid paper. The ammonia management was used to dope the 3D porous carbons with different types of nitrogen heteroatoms in a way that replaced carbon atoms. The N2 adsorption–desorption characterization suggested...
In spite of the recent rapid growth in stretchable electronic device research, efforts have been mainly focused on material selection, device geometric design and short-term performance characterization. The present research focuses on the long-term durability of electromechanical and electrochemical performance of buckled carbon nanotube fibers based stretchable conductors and supercapacitors under...
Carbon nanotube (CNT) films have shown many promising advantages in the development of high-performance flexible supercapacitors in terms of electrode specific area, mechanical reliability under bending and stretching, electron and ionic mobility tailored for high-rate performance etc. In this review, the recent progress in the design, preparation and functionalization of CNT film based electrodes...
Millimeter-to-centimeter scale vertically aligned carbon nanotube (VACNT) arrays are widely studied because of their immense potential in a range of applications. Catalyst control during chemical vapor deposition (CVD) is key to maintain the sustained growth of VACNT arrays. Herein, we achieved ultrafast growth of VACNT arrays using Fe/Al2O3 catalysts by ethanol-assisted two-zone CVD. One zone was...
The interlocked carbon nanotube (CNT) networks formed by floating catalyst chemical vapor deposition method is found to show greatly enhanced damping ratio (0.37–0.42) and much higher storage modulus (>11.0GPa) compared to most of engineering damping materials and any other kinds of CNT networks and composites ever reported. Interestingly, its damping performance is frequency-dependent with damping...
Vertically-aligned carbon nanotube array is expected to inherit high thermal conductivity and mechanical compliance of individual carbon nanotube and serve as thermal interface material. In this paper, vertically-aligned multi-walled carbon nanotube arrays have been directly grown on Pt film and the thermal performance has been studied by using laser flash technique. The determined thermal diffusivity...
To synthesize carbon nanotube/carbon matrix (CNT/C) composites rivaling or exceeding the mechanical and electrical properties of current carbon fiber/carbon matrix composites, it is essential to align carbon nanotubes in the composite. In this work, we fabricated CNT/polyacrylonitrile (PAN) precursor composites with high degree of CNT alignment, and carbonized and graphitized them at high temperatures...
Significant progress has been made in recent years in research on wet spinning and hydrothermal synthesis of graphene fibers. In this paper, we report the relationship between the mechanical performance of graphene oxide (GO) fibers and their processing parameters in wet spinning. With super-aligned carbon nanotube (CNT) film wrapping, the specific strength and electrical conductivity of reduced GO...
Vertically aligned nitrogen-doped carbon nanotubes (NCNTs) were synthesized by the pyrolysis of acetonitrile in the presence of ferrocene catalyst (2wt.%) with water assistance. Herein, we demonstrated that water could be a special tool to shape the structure of the NCNTs and it can be injected as much as 33.3wt.% to grow NCNTs. More significantly, the nitrogen content of NCNTs and their tubular microstructures...
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