Recently amorphous MoS2 thin film has attracted great attention as an emerging material for electrochemical hydrogen evolution reaction (HER) catalyst. Here we prepare the catalyst on Au by atomic layer deposition (ALD) using molybdenum hexacarbonyl (Mo(CO)6) and dimethyl disulfide (CH3S2CH3) Mo S precursors, respectively. Each active site of effectively catalyzes HER with excellent turnover frequency 3 H2/s at 0.215 V versus reversible electrode (RHE). The Tafel slope (47 mV/dec) suggests...

An amorphous MoS₂ thin film is grown at 100 °C on SiO₂/Si by atomic layer deposition using molybdenum hexacarbonyl and dimethyldisulfide. The as-grown crystallized with (002) basal planes in a direction parallel to the substrate.

We report the wet-chemistry synthesis of a new type porous carbon nanosheet whose thickness can be precisely controlled over nanometer length scale. This feature is distinct from conventional carbons that are composed micron-sized or larger skeletons, and structure less controlled. The uses graphene oxide (GO) as shape-directing agent asparagine bridging molecule connects GO in situ grown polymers by electrostatic interaction between molecules. assembly nanosheets produce macroscopic...

Microporous carbon sheets with precisely controlled thickness, narrow pores, short diffusion paths, high electrical conductive networks, and good wettability are synthesized using very low amounts of graphene as a shape-directing agent via an ionic liquid-assisted surface coating method. When used the electrode for supercapacitors, demonstrate excellent rate capability, cycle stability, specific capacitance, energy/power density. As service to our authors readers, this journal provides...

Abstract Sandwich‐type microporous hybrid carbon nanosheets (MHCN) consisting of graphene and layers are fabricated using oxides as shape‐directing agent the in‐situ formed poly(benzoxazine‐ co ‐resol) precursor. The reaction condensation can be readily completed within 45 min. obtained MHCN has a high density accessible micropores that reside in porous with controlled thickness (e.g., 17 nm), surface area 1293 m 2 g −1 narrow pore size distribution ca. 0.8 nm. These features allow an easy...

Amorphous molybdenum sulfide (MoSx) has been identified as an excellent catalyst for the hydrogen evolution reaction (HER). It is still a challenge to prepare amorphous MoSx more active and stable HER. Here catalysts are prepared on carbon fiber paper (CFP) substrates at 200 °C by simple hydrothermal method using molybdic acid thioacetamide. Because CFP intrinsically hydrophobic due its graphene-like structure, two kinds of hydrophilic pretreatment methods [plasma (PP) electrochemical (EP)]...

We describe the synthesis of polybenzoxazine-based spheres that can be carbonized with little shrinkage to produce monodisperse carbon abundant porosity. The porous structure was analyzed by nitrogen sorption isotherms. Elemental analysis, infrared spectroscopy and 1H → 13C CP/MAS NMR analysis were carried characterize surface chemistry spheres. contain intrinsic nitrogen-containing groups make them more useful for CO2 adsorption. adsorption capacity reach 11.03 mmol g−1 (i.e. 485 mg g−1) at...

A novel graphene modified carbon nanosheet (GMCN) was constructed by using oxide as the shape-directing agent, and resorcinol formaldehyde precursors through a surface assembly process. The GMCN can be used an efficient electrochemical sensing material for Pb(II) detection in aqueous solution square wave anodic stripping voltammetry. Due to integration of porous features resin-based excellent electrical conductivity graphene, such materials possess superior adsorption capacity fast...

MoS2 is a promising material to replace the Pt catalyst in electrochemical hydrogen evolution reaction (HER). It well known that activity of HER significantly promoted by doping cobalt atoms. Recently, Co–Mo–S phase, which atoms decorate edge positions slabs, has been identified as co-catalytic phase Co-doped (Co-MoSx) with low Co content. Here, we report effect incorporation chemical state Co-MoSx catalyst, gives rise effect. catalysts various contents were prepared on carbon fiber paper...

Abstract Understanding the mechanisms that promote cooperative behaviors of bacteria in their hosts is great significance to clinical therapies. Environmental stress generally believed increase competition and reduce cooperation bacteria. Here, we show bacterial can fact be maintained because environmental stress. We Pseudomonas aeruginosa regulates secretion iron-scavenging siderophores presence different stresses, reserving this public good for private use protection against reactive...

Atomic layer deposition (ALD) has emerged as an efficient method to design and prepare catalysts with atomic precision. Here, we report a comprehensive study on ALD of molybdenum sulfide (MoSx) for electrocatalytic hydrogen evolution reaction. By using hexacarbonyl dimethyldisulfide the precursors Mo S, respectively, MoSx are grown at 100 °C porous carbon fiber papers (CFPs). The process results in growth particle-like CFP due lack adsorption sites, its crystallographic structure is mixture...

Ultrasensitive ratiometric fluorescent pH probes based on dual dye-labeled pH-responsive diblock copolymer micellar scaffold are constructed. The pH-sensitive emitting nature of BTPE dyes and emission turn-on CMA moieties triggered by pH-actuated micelle-to-unimer synergistically contribute to the observed ≈250-fold changes BTPE/CMA intensity ratios in whole range. Two-photon mapping intracellular gradients subjected nanoparticles their endocytic pathway has been thus achieved. As a service...

The structure of bacterial biofilms depends on environmental conditions, such as availability nutrients, during biofilm formation. In turn, variations in part reflect differences motility early Pseudomonas aeruginosa deprived nutrients remain dispersed a surface, whereas cells supplemented with additional cluster and form microcolonies. At the single-cell scale, how bacteria modify their to favour distinct life cycle outcomes remains poorly understood. High-throughput algorithms were used...

Abstract Adaptive responses greatly improve the competitive capacities of bacteria in diverse environments. Here, we investigate whether can adapt to a microenvironment with distinctive softness by examining type-IV pili (TFP)-mediated motility Pseudomonas aeruginosa cells on brush-like surfaces that are grafted layer thermally sensitive polymer chains, where brush-layer is tunable applying small temperature change (from 30 37 °C). We report P. slingshot more soft at shear-thinning...

Exponentially growing bacteria in a well-mixed planktonic culture are generally assumed to be physiologically and phenotypically uniform distinct from their genetically identical counterparts living biofilms. Using combination of high spatiotemporal microscopy bacterial tracking algorithm, this study, we showed that cells Pseudomonas aeruginosa differently attached surfaces even when they remained the exponential phase. We consistently observed fast- slow-attaching phenotypes coexist cells,...

Organic–inorganic hybrid or alloy films have great potential as a functional material because they structural flexibility owing to the presence of an organic moiety. Here organic–inorganic were grown by molecular layer deposition (MLD) using trimethylaluminum and p-phenylenediamine. Although could be via self-limiting growth mechanism MLD, severely air sensitive. The stability problem solved alloying with Al2O3 layers. films, which repeating supercycles one subcycle for four subcycles...

Atomic layer deposition (ALD) of <TEX>$TiO_2$</TEX> thin film from <TEX>$TiCl_4$</TEX> and <TEX>$H_2O$</TEX> has been intensively studied since the invention ALD method to grow films via chemical adsorptions two precursors. However role HCl which is a gaseous byproduct in chemistry for growth still intriguing terms mechanism. In order investigate ALD, pulse its purging steps are inserted typical sequence pulse-purge-<TEX>$H_2O$</TEX> pulse-purge. When they after first-half reaction...

Despite the great advantages of microporous carbons for applications in gas phase separation, liquid enrichment, and energy storage devices, direct experiment data theoretical calculations on relevance properties structures are quite limited. Herein, two model carbon materials designed synthesized, i.e., nanosheets (MCN) spheres (MCS). They both have nearly same composition, surface chemistry, specific area, known morphology, but distinguishable diffusion paths. Based these types materials,...

Synthetic biology aims to make easier engineer and focuses on the design construction of core components that can be modeled, understood, tuned meet specific performance criteria, assembly these smaller parts devices into larger integrated systems solve problems. Here, we designed engineered a multicolor fluorescent reporter toolbox simultaneously monitor activities multiple genes in single cells. The contained standardized well-characterized genetic building blocks for convenient...

We present a method capable of detecting single slow-growing and growth-arrested cells in bacterial culture composed physiologically phenotypically different cells. Unlike the use transcriptional reporters to gauge metabolic activities cells, here, we fuse two fluorescent proteins with distinctive maturation rates construct timer directly determine growth rate Pseudomonas aeruginosa demonstrate that dual-color can indicate from cultures presence various environmental stresses, including...