Abstract Graphene nanoribbons (GNRs)—narrow stripes of graphene—have emerged as promising building blocks for nanoelectronic devices. Recent advances in bottom-up synthesis have allowed production atomically well-defined armchair GNRs with different widths and doping. While all experimentally studied exhibited wide bandgaps, theory predicts that every third GNR (widths N =3 m +2, where is an integer) should be nearly metallic a very small bandgap. Here, we synthesize the narrowest possible...

The development of effective and inexpensive hydrogen evolution reaction (HER) electrocatalysts for future renewable energy systems is highly desired. Platinum-based materials are the most active catalyzing HER, but reducing use Pt required because high price scarcity Pt. Here, we achieve pseudo-atomic-scale dispersion Pt, i.e. individual atoms or subnanometer clusters, on sidewalls single-walled carbon nanotubes (SWNTs) with a simple readily upscalable electroplating deposition method....

The ability to gate (i.e., allow or block) droplet and fluid transport in a directional manner represents an important form of liquid manipulation has tremendous application potential fields involving intelligent management. Inspired by passive across cell membranes which regulate permeability transmembrane hydrophilic/hydrophobic interactions, macroscopic Janus‐type are prepared facile vapor diffusion plasma treatments for gating. resultant Janus membrane shows water gating behavior...

Efficient hydrogen evolution reaction (HER) through effective and inexpensive electrocatalysts is a valuable approach for clean renewable energy systems. Here, single-shell carbon-encapsulated iron nanoparticles (SCEINs) decorated on single-walled carbon nanotubes (SWNTs) are introduced as novel highly active durable non-noble-metal catalyst the HER. This exhibits catalytic properties superior to previously studied nonprecious materials comparable those of platinum. The SCEIN/SWNT...

Abstract Chemical vapor deposition of a thin titanium dioxide (TiO 2 ) film on lightweight native nanocellulose aerogels offers novel type functional material that shows photoswitching between water‐superabsorbent and water‐repellent states. Cellulose nanofibrils (diameters in the range 5–20 nm) with crystalline internal structures are topical due to their attractive mechanical properties, they have become relevant for applications recent progress methods preparation. Highly porous, here...

Thermodynamically unusual surfaces that possess two contradictory wetting properties, i.e., underoil superhydrophobicity and underwater superoleophobicity, are prepared by the combination of re-entrant topography delicately matched surface chemistry. The preparation such extraordinary relies on key design criteria employs a metastable state effect in solid–oil–water systems. As service to our authors readers, this journal provides supporting information supplied authors. Such materials peer...

We propose a simple method for the efficient and rapid synthesis of one-dimensional hematite (α-Fe2O3) nanostructures based on electrical resistive heating iron wire under ambient conditions. Typically, 1–5 μm long α-Fe2O3 nanowires were synthesized time scale seconds at temperatures around 700 ° ⊂. The morphology, structure, mechanism formation studied by scanning transmission electron microscopies, energy dispersive X-ray spectroscopy, photoelectron Raman techniques. A nanowire growth...

We have developed a magnesia (MgO)-supported iron−copper (FeCu) catalyst to accomplish the growth of single-walled carbon nanotubes (SWNTs) using monoxide (CO) as source at ambient pressure. The FeCu system facilitates small-diameter SWNTs with narrow diameter distribution. UV−vis−NIR optical absorption spectra and photoluminescence excitation (PLE) mapping were used evaluate relative quantities different (n,m) species. also demonstrated that addition Cu Fe can cause remarkable increase in...

Mesoporous heteroatom-doped carbon-based nanomaterials are very promising as catalysts for electrochemical energy conversion and storage. We have developed a one-step catalytic chemical vapor deposition method to grow highly graphitized graphene nanoflake (GF)–carbon nanotube (CNT) hybrid material doped simultaneously with single atoms of N, Co, Mo (N–Co–Mo–GF/CNT). This high-surface-area has mesoporous structure, which facilitates oxygen mass transfer within the catalyst film, exhibits high...

Continuously increasing production of Li-ion batteries (LIBs) for the Green Transition is underlined by absence feasible recycling methods graphite, regardless its criticality as a raw material. The current study demonstrates novel strategy to valorize waste graphite valuable material in oxygen electrocatalyst production. Industrially produced LIBs post-metallurgical leach residue was transformed into highly active bifunctional electrocatalyst, which subsequently successfully applied an...

This work is devoted to a novel efficient strategy for single-walled carbon nanotube doping employing heat treatment with nitrogen dioxide. Unlike numerous reports of unstable NO2 at room temperature, our method combines high efficiency and stability, enabled by temperature-dependent adsorption dioxide on the surface. We reveal that stability increases temperature reaching maxima 300 °C avoiding any detrimental effect structure optical transmittance. As result, we demonstrate doped...

Nanowires (NWs) of metal oxides (Fe2O3, CuO, V2O5 and ZnO) were grown by an efficient non-catalytic economically favorable method based on resistive heating pure wires or foils at ambient conditions. The growth rate iron oxide NWs exceeds 100 nm s−1. Produced typically 1–5 µm long with diameters from 10 to 50 nm. produced characterized means SEM, TEM, EDX, XPS Raman techniques. field emission measurements the as-produced CuO found have a threshold as low 4 V µm−1 0.01 mA cm−2. formation...

To reduce the loading of noble metals on fuel cell catalysts a synthesis method providing evenly distributed nanoparticles support surface is needed. Narrow size distribution palladium were prepared porous carbon by atomic layer deposition (ALD), and their activity for ethanol isopropanol oxidation was studied electrochemically in alkaline media. Palladium particles had smaller average particle sizes material resulting ∼50 mV lower onset potential 2.5 times higher mass alcohol compared with...

We have studied the adsorption and self-assembly of cobalt phthalocyanine (CoPc) on epitaxial graphene grown iridium (111) by scanning tunneling microscopy (STM), Auger electron spectroscopy, low-energy diffraction (LEED). CoPc deposited graphene/Ir(111) at room-temperature self-assembles into large, well-ordered domains with a nearly square unit cell. On basis observed LEED pattern STM images, detailed structure for overlayer is proposed. Despite corrugation moiré Ir(111), its hexagonal...

Herein, the process of synthesis carbon nanotubes is modified to grow an efficient electrocatalyst for oxygen evolution reaction as a critical in electrochemical water splitting and rechargeable metal–air batteries.

Earth-abundant element-based inorganic–organic hybrid materials are attractive alternatives for electrocatalyzing energy conversion reactions. Such material structures do not only increase the surface area and stability of metal nanoparticles (NPs) but also modify electrocatalytic performance. Here, we introduce, first time, multiwall carbon nanotubes (MWNTs) functionalized with nitrogen-rich emeraldine salt (ES) (denoted as ES-MWNT) a promising catalyst support to boost activity magnetic...

Aligning polymeric nanostructures up to macroscale in facile ways remains a challenge materials science and technology. Here we show self-assemblies where nanoscale organization guides the macroscopic alignment millimetre scale. The concept is shown by halogen bonding mesogenic 1-iodoperfluoroalkanes star-shaped ethyleneglycol-based polymer, having chloride end-groups. mesogens segregate stack parallel into aligned domains. This leads layers at ~10 nm periodicity. Combination of...

Abstract Efficient hydrogen evolution reaction (HER) through effective and inexpensive electrocatalysts is a valuable approach for clean renewable energy systems. Here, single‐shell carbon‐encapsulated iron nanoparticles (SCEINs) decorated on single‐walled carbon nanotubes (SWNTs) are introduced as novel highly active durable non‐noble‐metal catalyst the HER. This exhibits catalytic properties superior to previously studied nonprecious materials comparable those of platinum. The SCEIN/SWNT...

Electrochemical reduction of CO2 to valuable products on molecular catalysts draws attention due their versatile structures allowing tuning activity and selectivity. Here, we investigate temperature influence conversion product selectivity over a Cobalt(II)-tetraphenyl porphyrin (CoTPP)/multiwalled carbon nanotube (MWCNT) composite in the range 20–50 ℃. Faradaic efficiency changes with potential so that two-electron transfer CO formation is enhanced at low potentials temperatures while...

Developing highly efficient and robust electrocatalysts for oxygen evolution reaction (OER) is critical to renewable energy technologies. Here, we report an effective strategy enhance the OER activity of a perovskite electrocatalyst through improving electrical conductivity introduced by structural transition. La0.7Sr0.3Fe1−xNixO3−δ (denoted as LSFN‐x) with increasing Ni content found crystallize in higher symmetry structure exhibit improved catalytic performance. The optimized cubic...

One of the major challenges for in vivo electrochemical measurements dopamine (DA) is to achieve selectivity presence interferents, such as ascorbic acid (AA) and uric (UA). Complicated multimaterial structures ill-defined pretreatments have been frequently utilized enhance selectivity. The lack control over realized has prevented establishing associations between achieved electrode structure. Owing their easily tailorable structure, carbon nanofiber (CNF) electrodes become promising...

SiO(2) supported cobalt (Co) catalyst could be partially reduced and anchored by unreduced Co ions during a carbon monoxide (CO) chemical vapor deposition (CVD) process. This resulted in the formation of sub-nanometre metallic clusters catalyzing growth single-walled nanotubes (SWNTs) with narrow diameter distribution.

We have studied the incommensurate moir\'e structure of epitaxial graphene grown on iridium(111) by dynamic low-energy electron diffraction [LEED $I$($V$)] and noncontact atomic force microscopy (AFM) with a CO-terminated tip. Our LEED $I$($V$) results yield average positions all atoms in surface unit cell are qualitative agreement obtained from density functional theory. The AFM experiments reveal local variations structure: corrugation varies smoothly over several cells between 42 56 pm....