Materials Literature
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Syntheses of CdSe/ZnTe/ZnS (core/shell/shell) type-II quantum dots (QDs) are reported. Structural characterization was made via TEM, EDX, XPS and XRD. Photophysical properties were investigated via the interband emission (CdSe → ZnTe) and its associated quantum efficiency as well as relaxation dynamics. In comparison…
Theoretical investigation with Monte Carlo simulations predicts that thermal spin-switching hysteresis of transition-metal complexes appears even in nanoparticles, but the hysteresis width does not depend only on the interaction strength between molecules but also strongly on the shape and size of the particles.
The effect of polarization treatment on the interface between (LSM) cathode and (YSZ) electrolyte in solid oxide fuel cells has been studied by electrochemical impedance spectroscopy and atomic force microscopy. It has been found that the polarization has a significant effect not only on the electrocatalytic activitie…
Nanopositioning is one of the most intriguing challenges in nanoelectronics and photonics. As the optoelectronic circuit components become more and more complex, the importance of nanopositioning becomes critical. For example, in single-mode fiber telecommunications it is easy to show that an alignment deviation as sm…
A nanosensor technology has been developed using single-walled carbon nanotubes (SWNTs) combined with silicon-based microfabrication processes. A sensor array containing twelve interdigitated electrode (IDE) pairs with different gap sizes has been designed. The IDE fingers were fabricated using photolithography and th…
Porphine bearing triphenylamine (TPA) pendant groups and their zinc complexes, zinc meso-tetra-p-(di-p-phenylamino)phenylporphyrin (ZnTDPAPP) and zinc meso-tetra-p-(di-p-tolylamino)phenylporphyrin (ZnTDTAPP) are synthesized and their spectral and electrochemical characteristics are studied. Zinc meso-tetraphenylporphy…
Solution properties of complexes of a new H 4 dota-like ligand containing three acetate and one methylphosphonate pendant arms (H 5 do3ap, H 5 L) were studied. The ligand exhibits a high last dissociation constant (p K A = 13.83) as a consequence of the presence of phosphonate moiety. In solution, successive attachmen…
A medium-nuclearity mixed-valence polyoxomolybdate [H2Mo16O52]10-={Mo16}(1a) was synthesized using an approach that employed protonated hexamethylenetetramine (HMTAH+) as counter ion and yielded (HMTAH)10 1a.34 H2O (1). The {Mo16} cluster anion exhibits significant nucleophilicity and traps electrophiles such as dival…
Growth and electrochemical properties of single-crystalline vanadium pentoxide (V 2 O 5 ) nanorod arrays were investigated. Vanadium pentoxide nanorod arrays were grown by electrochemical deposition, surface condensation induced by a pH change and sol electrophoretic deposition. Uniformly sized vanadium oxide nanorods…
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The crystal structures of chalcostibite CuSbS 2 (orthorhombic, space group Pnma, a = 6.018(1), b = 3.7958(6), and c = 14.495(7) Å, V = 331.1(1) Å 3 , Z = 4, R1 = 0.040, wR2 = 0.155 for 533 reflections) and emplectite CuBiS 2 (orthorhombic, space group Pnma, a = 6.134(1), b = 3.9111(8), and c = 14.548(8) Å, V = 348.8(2…
Recent photonic device structures, including distributed Bragg reflectors (DBRs), one-dimensional (1-D) or two-dimensional (2-D) photonic crystals, and surface plasmon devices, often require nanoscale lithography techniques for their device fabrication. Focused ion beam (FIB) etching has been used as a nanolithographi…
The structures of oxides formed in water and lithiated water on three Zr-based alloys with varied corrosion behavior were studied with micro-beam synchrotron radiation and optical microscopy. Micro-beam synchrotron radiation (0.2 μm spot) has a unique combination of high elemental sensitivity (ppm level) and fine spat…
We have synthesized a biologically inert, photosensitive derivative of the major excitatory amino acid, L-glutamate (which we call MDNI-glu) that makes more efficient use of incident light than all other caged glutamates. Laser flash photolysis of MDNI-glu in acutely isolated hippocampal brain slices evoked a rapid in…
The crystal structures of Mg-rich SFCA (SFCAM); Ca2(Ca0.10Mg1.20Fe5.55Si1.50Al3.65)O20 (triclinic P1, a=8.848(1) Å, b=9.812(1) Å, c=10.403(1) Å, α=64.35(1)°, β=84.19(1)°, γ=66.27(1)°, V=742.4(1) Å3, Z=2) and Ca2(Mg2.00Fe4.45Si2.15Al3.40)O20 (triclinic P1, a=8.928(2) Å, b=9.823(2) Å, c=10.389(1) Å, α=64.41(1)°, β=83.90…
A novel class of organic–inorganic nanohybrid material was prepared by the intercalation in kaolinite of a molten organic salt (1-ethyl pyridinium chloride, EP) above its melting temperature. The intercalation proceeded at 170 °C under N2. It did not succeed when kaolinite was used as the starting material, whereas th…
Surface-enhanced Raman scattering (SERS) has recently been a matter of keen interest from the points of both basic science and applications because by using the SERS effect one can obtain Raman signals even from a single molecule. Immunoassay is one of the most promising fields in the applications of SERS, and the pur…
1,5-Diisopropyl-6-oxo-verdazyl free radicals were synthesized via the condensation of BOC protected isopropyl hydrazine with phosgene, deprotection with aqueous HCl, condensation with aldehydes to form tetrazanes and finally oxidation to give the free radicals. The introduction of isopropyl groups results in free radi…
Based on a combined theoretical-experimental study, we propose that substituted m-phenylene ligands (m-N-Phi-N) can act as tuneable strong ferromagnetic couplers connecting Cu(II) ions; a new complex presenting that bridge with J close to +15 cm(-1) has been suggested and synthesized.
Europium ͑Eu 2+ ͒-doped alkaline earth orthosilicates ͑Sr 1-x Ba x ͒ 2 SiO 4 :Eu 2+ , are studied as a phosphor for color-tunable white-lightemitting diode.With an increase of Ba ions in ͑Sr 1-x Ba x ͒ 2 SiO 4 :Eu 2+ , the lattice constants increase, and the emission bands shift to higher energy in a systematic way.Th…