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Carbon nanotube (CNT) thin films have attracted great attention for their use in flexible electronics, including thin-film transistors (TFTs) and memory devices, due to their excellent optical, electrical and mechanical properties. The flexibility of current CNT TFTs is usually limited by the use of rigid inorganic oxide insulators. Gate dielectrics made of polymers are promising candidates that give...
Photoluminescence (PL) spectra of boron-doped diamonds at temperature 298 K were recorded with excitation in wavelength range 110–300 nm from a synchrotron source. A prominent emission feature was measured at 480.0 nm, corresponding to energy 2.535 eV; we detected also a distinct photoluminescence excitation (PLE) band at 220.5 nm, 5.623 eV, for the first time. For sensitive analysis, the UV-PL technique...
Lithium–sulfur (LiS) battery, as a high energy-density storage system, has attracted great attention for next generation rechargeable battery applications. However, the fast capacity decay caused by lithium polysulfides (LiPSs) dissolution impedes its prospect for commercialization. In this work, nitrogen-doped graphene, as a chemical immobilizer, was designed to bind LiPSs and stabilize sulfur in...
Lithium-sulfur (Li-S) batteries are one of the most promising next-generation secondary battery systems for meeting increasing energy storage demands due to their high theoretical energy density. However, the commercialization of Li-S batteries is hindered by the low electrical conductivity of sulfur and the severe polysulfide shuttling problem. Here, we report the easy synthesis of a nitrogen-doped...
A hierarchically meso/micro-porous Fe-N-doped carbon nanotube electrocatalyst (meso/micro-Fe-N-CNT), for the first time, was synthesized. Anodic aluminum oxide (AAO) was used as a template to cast the CNT framework and Fe(NO)3 was filled in the AAO nanochannels as both a mesopore template in CNT walls and the iron source to form Fe-N-C active sites. Subsequent NH3 activation was carried out to create...
Single-wall carbon nanotubes (SWCNTs) have been a focus of nanomaterial research over the past two decades, due to their wide range of potential applications in micro- and nano-electronics, energy storage, solar cells, sensors, drug delivery, and neuronal interfaces. Structurally-uniform and chirality-pure SWCNTs are highly desired and essential for both fundamental studies and many applications such...
Capacitive deionization (CDI) with a high energy efficiency and low cost is considered a promising desalination technique to obtain clean water. To achieve excellent CDI performance, a rational design of the structure of the electrode material is essential. In this study, a flexible cotton-derived carbon sponge (CCS) with a high specific surface area (up to 2680 m2/g) and suitable pore size distribution...
A room-temperature polymer-assisted transfer process is developed for large-area, single-layer graphene grown by means of chemical vapor deposition (CVD). This process leads to transferred graphene layers free of polymer contamination. The absence of polymer residues boosts the surface-enhanced Raman scattering (SERS) of the CVD graphene with gold nanoparticles (Au NPs) deposited atop by evaporation...
Percolating carbon nanoparticles were added into electrolyte to improve the performance of Li–S batteries. These percolating carbon nanoparticles acted as dispersible nanosized electrodes, allowed the direct electrochemical utilization of dissolved polysulfides in electrolyte, and mitigated the polysulfide shuttle. As a result, the polysulfide utilization was improved with the virtual sulfur capacity...
Flexible transparent conductive films (TCFs) are vital to promote the development of flexible and foldable devices including touch panels, displays, organic solar cells, etc. We have prepared a large-area, flexible, and color-neutral single-wall carbon nanotube:sodium dodecylbenzene sulfonate/poly-(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (SWCNT:SDBS/PEDOT:PSS) composite TCF on a poly(ethylene...
We study ultrafast dynamics in graphene grown by chemical vapor deposition, which presents a positive peak followed by a negative slow recovery process, and is different from the fully positive or negative dynamics reported. We discuss the diversity of ultrafast dynamics. A dynamic model of differential optical conductivity is developed to simulate ultrafast dynamics. It is found that the diversity...
We fabricated a monolithic Fe 2 O 3 /graphene hybrid directly by hydrothermal reaction of ferrous oxalate dihydrate and graphene oxide without using a reducing agent. The reduced graphene oxide formed an interconnected network structure that can be used as a support for homogeneous distribution of active Fe 2 O 3 nanoparticles. The graphene network and the pore channels...
Interest in two-dimensional, sheet-like or flake-like carbon forms has expanded beyond monolayer graphene to include related materials with significant variations in layer number, lateral dimension, rotational faulting, and chemical modification. Describing this family of “graphene materials” has been causing confusion in the Carbon journal and in the scientific literature as a whole. The international...
Multi-wall carbon nanotubes (MWCNTs) prepared by chemical vapor deposition, were pretreated by ball milling, chemical activation and ammoxidation and the influence of the pretreatment on their electrochemical capacitance was investigated. Results show that MWCNTs can be shortened and broken by ball milling and chemical activation, and as a result their surface area and pore volume are increased. However,...
Double-walled carbon nanotubes (DWCNTs) were synthesized by a metal-catalyst-free chemical vapor deposition method using silicon oxide nanoparticles as a catalyst. The diameters and lengths of the DWCNTs are in the ranges of 3–5nm and 1–5μm, respectively. The amount of DWCNTs produced is about 70%, while the remainder is single-walled carbon nanotubes. A heat treatment of the SiO 2 /Si substrate...
Tadpole-like carbon nanotubes (CNTs) were synthesized by chemical vapor deposition from ethanol using TiO 2 nanoparticles (NPs) as catalyst. The CNTs have a cup-stacked structure are typically less than 500nm in length, and have a non-uniform diameter with a big “head” and a smaller diameter “tail”, inside which a catalyst NP is usually encapsulated. Transmission electron microscopy (TEM)...
Patterning is an essential and important process for the future use of single-walled carbon nanotube (SWCNT) thin films (TFs) in electronic devices. Different from traditional Si based electronic materials, SWCNTs can be easily etched when exposed to an oxidative atmosphere. Here we propose a gas exposure method to pattern SWCNT TFs on flexible polymeric substrates, without using vacuum and high temperature...
Graphene has attracted great interest for its excellent mechanical, electrical, thermal and optical properties. It can be produced by micro-mechanical exfoliation of highly ordered pyrolytic graphite, epitaxial growth, chemical vapor deposition, and the reduction of graphene oxide (GO). The first three methods can produce graphene with a relatively perfect structure and excellent properties, while...
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