Electrical current suppression in Pd-doped vanadium pentoxide nanowires caused by reduction in PdO due to hydrogen exposure

Pd nanoparticle-doped vanadium pentoxide nanowires (Pd-VONs) were synthesized. Electrical current suppression was observed when the Pd-VON was exposed to hydrogen gas, which cannot be explained by the work function changes mentioned in previous report such as Pd-doped carbon nanotubes and SnO 2 nanowires. Using the x-ray photoelectron spectroscopy, we found that the reduction in PdO due to hydrogen exposure plays an important role in the current suppression of the Pd-VON.open4

The Observation of Electrical Hysteric Behavior in Synthesized V 2

The anomalous electrical conductance for the V2O5 foam synthesized via a foaming process was measured. In the annealing process, the synthesized V2O5 foam is recrystallized with the increase of annealing temperature. The recrystallization procedure was characterized by using physical analysis tools such as thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), and X-ray diffractometer. In the electrical analysis technique of current-voltage characteristics as a function of annealing temperature, an anomalous hysteric behavior appears at the annealing temperature of 400°C. We conclude that the recrystallization of V2O5 nanoplates results in the anomalous behavior in voltage-dependent current characteristics

Influence of Substrate Temperature on Magnetic and Structural Properties of RF Magnetron Sputtered Co-Cr Thin Films

The present paper describes the substrate temperature T$\text{}_{s}$ dependence on magnetic and structural properties of Co-21 at.% Cr thin films deposited on the Corning glass substrate by RF magnetron sputtering. The properties of the samples, such as saturation magnetization M$\text{}_{s}$, in-plane squareness ratio S$\text{}_{∥}$, effective magnetic anisotropy field H'$\text{}_{k}$, spectroscopic splitting factor g, and hcp (002) peak intensity I$\text{}_{002}$, were examined by vibrating sample magnetometer, Q-band (≈ 33.9 GHz) ferromagnetic resonance measurements and X-ray diffractometry. Specially, the presence of the various ferromagnetic constituents in Co-Cr thin films are examined by the ferromagnetic resonance studies. With increasing T$\text{}_{s}$ from room temperature to 200°C, S$\text{}_{∥}$ increases from 0.08 to 0.56 but H'$\text{}_{k}$ decreases from 2530 Oe to -3900 Oe. Also I$\text{}_{002}$ decreases with increasing T$\text{}_{s}$. It is summarized that the perpendicular magnetic anisotropy and c-axis orientation of Co-Cr films are improved at lower substrate temperature

Electrical quadruple hysteresis in Pd-doped vanadium pentoxide nanowires due to water adsorption

Humidity-dependent current–voltage (I–V) characteristics of Pd-doped vanadium pentoxide nanowires (Pd-VONs) were investigated. Electrical quadruple hysteresis (QH) was observed and attributed to the large amount of water molecules adsorbed on the nanowires. Using QH in Pd-VONs, the reaction of water with PdO was interpreted as the water molecules are desorbed and then dissociated with increasing bias voltage. Owing to the dissociated H+ and OH− ions, PdO is reduced and oxidized. As a result, water molecules recombine as the bias voltage is decreased