Single-walled carbon nanotubes (SWNTs) are potential materials for future nanoelectronics. Since the electronic and optical properties of SWNTs strongly depend on tube diameter chirality, obtaining with narrow (n,m) chirality distribution by selective growth or chemical separation has been an active area research. Here, we demonstrate that a new, bimetallic FeRu catalyst affords SWNT in methane CVD. At 600 °C, CVD produced predominantly (6,5) according to UV−vis−NIR absorption...

P2-type Fe/Mn-based layered oxides have attracted extensive attention as potential candidates for sodium-ion batteries due to their low cost, abundant reserves, and high theoretical capacity. However, when the cathode works...

There is great interest in using single-walled carbon nanotubes (SWNTs) as nanoscale probes and sensors biological electronics optical devices because the electronic properties of SWNTs are extremely sensitive to surrounding environments. A well-controlled modification SWNT surfaces may provide unique interfaces that variables such pH, glucose, various ions proteins. In this paper, we report a facile chemical routine prepare water-soluble still retain their van Hove singularities after acid...

The unique optical properties of semiconducting single-walled carbon nanotubes (SWNTs) are exquisitely sensitive to variations in the surrounding environments. Here, we have studied redox chemistry SWNTs encased with double-stranded deoxyribonucleic acid (DNA) reacted either hydrogen peroxide H2O2 or glucose presence oxidase enzyme. DNA-SWNT hybrids prepared aqueous solution by sonication that cuts DNA into short fragments 100−300 base pairs which efficiently wrap individual nanotubes....

The dynamics of water at the surface artificial membranes composed aligned multibilayers phospholipid dilauroyl phosphatidylcholine (DLPC) are probed with ultrafast polarization selective vibrational pump−probe spectroscopy. experiments performed various hydration levels, x = 2 − 16 molecules per lipid 37 °C. ∼1 nm above or below membrane surface. conducted on OD stretching mode dilute HOD in H2O to eliminate excitation transfer. FT-IR absorption spectra stretch DLPC bilayer system low...

We report the development of four wave mixing vibrational analog to 2D NMR and demonstrate its spectral selectivity, sensitivity interactions causing mode coupling, ability spectrally resolve isotopic mixtures. The method discriminates against uncoupled modes isolates features that are associated with intra- or intermolecular interactions.

It remains an elusive goal to obtain high performance single-walled carbon-nanotube (SWNT) electronics such as field effect transistors (FETs) composed of single- or few-chirality SWNTs, due broad distributions in as-grown materials. Much progress has been made by various separation approaches materials enriched metal semiconducting nanotubes even single chiralties. However, research validating SWNT separations electrical transport measurements and building functional electronic devices...

Low-cost broad-band optical limiters based on nanographene have been studied, finding optical-limiting properties superior to those of current standards, carbon fullerenes (C60) solutions and black suspensions. Further examination indicates that the presence π conjugation improves responses. Superior limiting performance is retained regardless solvent viscosity polarity, a unique feature graphene not observed in C60 black. Graphene suspensions organic solvents can work under 10 Hz laser...

Single-wall carbon nanotubes (SWNTs) were fluorinated with F2 at 250 °C, and then some heated under He to temperatures ranging from 100 400 °C desorb the fluorine. The resulting samples studied X-ray photoelectron spectroscopy, Raman IR electrical resistance measurements. goals identify, as a function of fluorination defluorination, nature fluorine bonding, damage tubes, changes average tube diameter proportions metallic semiconducting effects on conductivity its mechanism. stoichiometry...

We report the measurement of third order susceptibility ${\ensuremath{\chi}}^{(3)}$ for doubly vibrationally enhanced four wave mixing in model system, acetonitrile. Two resonances multiplicatively increase efficiency if there is mode coupling and provide an additional spectral dimension vibrational spectroscopy that greatly improves its resolution. Such methods promise to have important applications complex materials.

The significant capacity loss and pulverization caused by the dramatic increase in volume of Sn-based anodes during redox reactions severely limit their practical application lithium-ion batteries. Herein, with ultralong cycle life high compounds (SnS-C/NS@CNFs), a self-supporting anode was prepared electrospinning followed calcination scheme, which is superb material for lithium storage since buffer matrix reduces expansion Sn. In this strategy, SnS nanoparticles are scattered into porous...

A new form of vibrational spectroscopy has recently been demonstrated using three coherent sources to generate nonlinear four wave mixing (FWM). It is an optical analogue 2D NMR. The transitions that occur in FWM include combinations infrared absorption and Raman result doubly vibrationally enhanced (DOVE) In this paper, we use acetonitrile different mixtures as a model system demonstrate the spectral selectivity allows DOVE methods remove congestion from spectra complex discriminate against...

All structured biological macromolecules must overcome the thermodynamic folding problem to populate a unique functional state among vast ensemble of unfolded and alternate conformations. The exploration cooperativity in protein has helped reveal distinguish underlying mechanistic solutions this problem. Analogous dissections RNA tertiary stability remain elusive, however, despite central importance folded molecules potential fundamental properties via comparisons folding. We report direct...

Low-frequency dielectric polarization of single-walled carbon nanotubes (SWNTs) not only affects charge carrier transport in SWNT-based nanoelectronic devices but also determines their interaction with molecules, other nanomaterials, and external fields. Differential responses metallic semiconducting SWNTs are critical electronic-type sorting SWNTs. Here, we describe the measurement low-frequency individual without making electrical contacts to nanotubes. Qualitative contrast is observed...

Today, rechargeable lithium-ion batteries are an essential portion of modern daily life. As a promising alternative to traditional energy storage systems, they possess various advantages. This review attempts provide the reader with indepth understanding working mechanisms, current technological progress, and scientific challenges for wide variety battery (LIB) electrode nanomaterials. Electrochemical thermodynamics kinetics two main perspectives underlying our introduction, which aims...

<title>Abstract</title> One-dimensional (1D) titanate nanotubes have garnered significant attention in the field of lithium-ion batteries due to their high specific surface area, excellent electrical conductivity, and efficient ion transport properties. However, despite simplicity hydrothermal synthesis method, underlying mechanisms by which key parameters (e.g., NaOH concentration, temperature, time) influence morphology performance materials remain unclear, thereby limiting industrial...

There is increasing interest in developing single-walled carbon nanotubes (SWNTs)-based optical biosensors for remote or vitro and vivo sensing because the near-IR properties of SWNTs are very sensitive to surrounding environmental changes. Many enzyme-catalyzed reactions yield hydrogen peroxide (H(2)O(2)) as a product. To our knowledge, there no report on interaction H(2)O(2) with from point view. Here, we study reaction an aqueous suspension water-soluble (ws) HiPco encased surfactant...

Sodium-ion batteries (SIBs) are promising candidates for large-scale energy storage. Increasing the density of SIBs demands anode materials with high gravimetric and volumetric capacity. To overcome drawback low conventional nanosized or porous electrode materials, compact heterostructured particles developed in this work improved Na storage capacity by volume, which composed SnO

The thermal recovery behavior of fluorinated single-walled carbon nanotubes has been systematically examined by UV−vis−near-IR absorption spectroscopy, IR spectroscopy and electric resistance measurements under different annealing temperatures. decrease in the intensity C−F stretch bands centered at about 1207 cm-1 reduced nanotube samples with heat indicates that pristine are recovered removal sidewall groups. After 100 °C noble gases, spectrum shows features A2u mode 867 E1u 1579 cm-1....