We demonstrate that any metal, even gold, silver, and copper, can act as a catalyst for SWCNT synthesis in chemical vapor deposition (CVD). Metal nanoparticles 3 nm or less diameter, introduced into CVD ambience immediately after heat treatment at 800-950 degrees C air, produce SWCNTs. The activation method is effective copper various noble metals well iron-family elements. This implies metal particle may SWCNTs when its size becomes 1-3 nm. In other words, carbon atoms form self-assembling...

The electronic structures and the work functions of pristine Cs-intercalated single-walled carbon nanotube bundles were investigated using ultraviolet photoemission spectroscopy. valence bands considerably altered from those graphite. A spectral shift to higher binding energy side was observed in sample. function found be 4.8 eV, which is 0.1–0.2 eV larger than that drastic decrease about 2.4

CeO2 layer was epitaxially grown for the first time on both (111) and (100) silicon substrates by vacuum evaporation. Characterization using Rutherford backscattering reflection high-energy electron diffraction proved that a Si has considerably good crystalline quality, whereas (100)Si contains large amount of crystallographic defects, especially in vicinity CeO2/Si interface. Auger spectroscopy analysis showed uniform concentration distribution Ce O throughout epitaxial layer.

Nanoscale metal catalysts have been indispensable for carbon nanotube (CNT) synthesis by chemical vapor deposition (CVD). We show that even semiconductor nanoparicles of SiC, Ge, and Si produce single-walled double-walled CNTs in CVD with ethanol. This implies nanosize structures might act as a template the formation CNT caps composed five- six-membered rings. Providing cap is essential role catalysts.

Photoemission and inverse photoemission spectroscopy has been used on ${\mathrm{C}}_{60}$ ${\mathrm{K}}_{3}$${\mathrm{C}}_{60}$ to study the change of electronic structure upon alkali doping its relation occurrence superconductivity. The experimental results show that does not lead a rigid filling lowest unoccupied molecular-orbital band by doped electrons but causes transfer states from an additional produced in gap. A comparison spectra indicates pseudo-gap about 0.5 eV opens at Fermi...

We have developed the iodoarene-catalyzed fluorination of carbonyl compounds and intramolecular aminofluorination ω-amino-alkenes using HF/<italic>m</italic>CPBA.

Transition metal dichalcogenides (TMDs) have emerged as exciting 2D materials beyond graphene due to their promising applications in the field of electronics and optoelectronics. Hence, ability produce controllable uniformly thick TMD sheets over a large area is utmost important for large-scale applications. Here, facile method synthesizing large-area, layer-controlled WS2, MoS2 by sulfurization corresponding thin films reported. A film, which deposited magnetron sputtering method, can be...

Individual single-walled carbon nanotubes (SWNTs) produce highly bright images of the insulator surface around them when observed by scanning electron microscopy at low primary-electron voltage. We found that near SWNTs emits more secondary electrons due to supplied through connecting outside area beam scanning. are thus highlighted as lines corresponding electron-beam-induced current range them. This technique provides a useful and effective way investigate lateral growth morphology on substrate.

We demonstrate that nanosized Au particles have carbon solubility. Au-catalyzed material growth by chemical vapor deposition undergoes a structural change, either nanowire or single-walled nanotube, depending on the catalyst particle size. This from is derived formation of Au−C eutectic alloy.

A wide-terrace single-domain Si(001)c(4\ifmmode\times\else\texttimes\fi{}2) surface has been obtained by cooling a Si(001)2\ifmmode\times\else\texttimes\fi{}1 to 200--80 K. Angle-resolved ultraviolet photoelectron spectra have measured for the at 200--100 K and compared with those surface. The electronic structure of appears be explained as that expected ``antiferromagnetic'' order asymmetric dimers Si. reminiscent c(4\ifmmode\times\else\texttimes\fi{}2)

The first chiral Lewis acid catalyzed enantioselective Friedel−Crafts alkylation of pyrroles with β-CF3 acrylates has been investigated, which afforded various types trifluoromethylated compounds in excellent yields (90−99%) high ee's (up to 99% ee). With the aid reaction adduct, optically active trifluorinated heliotridane was successfully constructed.

Photoelectron spectra from sublimed layers of chromatographically separated $\mathrm{La}@{\mathrm{C}}_{82}$ are presented. Using photon energies corresponding to the La $3d$ $4f$ transition, a resonant enhancement La-derived valence states is observed. From calculated intensities $5d$ and $5p$ in atom we estimate that about $\frac{1}{3}$ an electron charge left La-valence orbitals for $\mathrm{La}@{\mathrm{C}}_{82}$. In contrast previous interpretations core-level photoemission studies our...

Angle resolved X-ray photoelectron spectroscopy (AR-XPS) has been used for characterizing native oxide layers formed on the surface of ultra high-purity iron and copper by exposure to air at room temperature. Thickness an layer is found be thicker than that in initial stage oxidation almost unchanged time. On other hand, thickness increase with increasing These results are consistent spectral information exposed air; chemical state Fe independent time, whereas varies a long term.

A 64 channel arrayed-waveguide multiplexer with 0.4 nm (50 GHz) spacing at 1.55 µm has been fabricated using SiO2/Si waveguides. The authors obtained a crosstalk of less than –27 dB to neighbouring and all other channels. on-chip insertion loss ranges from 3.1 5.7 for central peripheral output ports, respectively.

Work functions of individual single-walled carbon nanotubes (SWNTs) were studied by means photoemission electron microscopy. function differences between the clearly observed in secondary images. The work 93 SWNTs found to range within 0.6eV, but most distributed a much narrower energy 0.2eV. do not seem have large structural dependence.

We report the effect of low-energy (1 keV) electron beam irradiation on gated, three-terminal devices constructed from metallic single-walled carbon nanotubes. Pristine devices, which exhibited negligible gate voltage response at room temperature and single-electron transistor characteristics low temperatures, when exposed to an beam, ambipolar field (room temperature) (low characteristics. This metal−semiconductor transition is attributed inhomogeneous electric fields arising charging...

How to lose fluorine: Biologically relevant oxazolidinones 1 were synthesized through the desymmetrization of unactivated aliphatic difluorides by Si-induced catalytic CF bond-cleavage using BSA/CsF (BSA=bis(trimethylsilyl)acetamide). The direct transformation 2 with isocyanates into cascade carbamoylation/cyclization, in which cyclization is induced Na-assisted bond activation, was also achieved. Detailed facts importance specialist readers are published as ”Supporting Information”. Such...