Oxidative polymerization of aniline in aqueous solution in the presence of trehalose was conducted. Fourier transform infrared spectroscopy confirmed successful preparation of polyaniline containing a trace amount of trehalose. Electron spin resonance spectroscopy revealed that electron spin concentration of the polyaniline increases with aniline/trehalose ratio in the polymerization. Scanning ...

The electron transport in inhomogenous quasi-one-dimensional conducting channels on the liquid helium surface are studied in the temperature range 0.6− 1.5 K. Inhomogeneities are created by charging the substrate on which the conducting channels are formed. It has been established that the electron conductivity practically does not depend on temperature at some substrate charge. The results obt...

Influence of a dc electric field, microwave and terahertz (up to 1.63 THz) excitation on the carrier transport in moderately compensated n-InSb containing graded n/n+ junction is investigated. Hot electron thermo-electromotive force and field dependences of the dc-conductivity were measured within 10-110 K. Peculiarities of electron gas heating and lowtemperature electron transport can be a...

A tight-binding parametrization of the band structure, along with a mean-field treatment of the Hund, electron-electron, and electron-lattice couplings, is used to obtain the full optical conductivity tensor of LaMnO3 as a function of temperature. We predict striking changes with temperature in the functional form and magnitude of the optical absorption. Comparison of our results with existing ...

Large fluctuations of conductivity with time are observed in a low-mobility twodimensional electron system in silicon at low electron densities ns and temperatures. A dramatic increase of the noise power (∝ 1/fα) as ns is reduced below a certain density ng, and a sharp jump of α at ns ≈ ng, are attributed to the freezing of the electron glass at ns = ng. The data strongly suggest that glassy dy...

The study reports some preliminary investigations on the template free synthesis of a scantly investigated polyaniline (PANI) derivative-Phenylenediamine (PDA) by template free method in the presence of Oxalic acid (OA) (dopant), using Ammonium Persulfate as oxidant. Polymerization of Phenylenediamine (PDA) was confirmed by the FT-IR as well as UV–visible studies. The morphology of Phenylenedia...

Weak localization is studied in two high-quality epitaxial graphene samples grown on silicon-faced 6H-SiC substrates. Following the methodology of Kozikov et al (2010 Phys. Rev. B 82 075424), we measured the temperature dependence of carrier conductivity at zero and low magnetic (B) fields. In both samples, a logarithmic temperature dependence of the carrier conductivity was observed at B = 0 a...

We present thermal measurements of large-area (over 1000 μm2) monolayer graphene samples at cryogenic temperatures to study the electron-phonon thermal conductivity of graphene. By using two large samples with areas which differ by a factor of 10, we are able to clearly show the area dependence of the electron-phonon cooling. We find that, at temperatures far below the Bloch-Grüneisen temperatu...

Porous metals are used in interfacial transport applications that leverage the combination of electrical and/or thermal conductivity and the large available surface area. As nanomaterials push toward smaller pore sizes to increase the total surface area and reduce diffusion length scales, electron conduction within the metal scaffold becomes suppressed due to increased surface scattering. Here ...

Hemiepiphytic Ficus species (Hs) possess traits of more conservative water use compared with non-hemiepiphytic Ficus species (NHs) even during their terrestrial growth phase, which may result in significant differences in photosynthetic light use between these two growth forms. Stem hydraulic conductivity, leaf gas exchange and chlorophyll fluorescence were compared in adult trees of five Hs an...