Realization of an open space ensemble for nanowires: a strategy for the maximum response in resistive sensors

Surface gas sensing kinetics of a WO3 nanowire sensor: part 1—oxidizing gases

“…However, a sensor of single nanowire structure can be exploited to elucidate the nanosize effect in gas sensing because the gas vs. surface reactions solely determine the sensor signal with rejection of parasitic effects, such as diffusion, complex current paths, size distribution, etc. In practice, similar conditions can be provided by nanowire ensemble structures possess large spaces [15].…”

“…The fabrication process for the porous nanowire sensor structures is depicted in Fig. 1 [15]. First, small pieces of silicon dioxide (300 nm)/silicon substrate (5 mm × 5 mm × 0.6 mm) were ultrasonicated sequentially in methanol, acetone, and deionized water for 15 min each and then blow dried with nitrogen gas.…”

Novel Preparation of Fe Doped TiO2 Nanoparticles and Their Application for Gas Sensor and Photocatalytic Degradation

“…The H 2 gas sensing mechanism of the resistive sensor base on metal oxide semiconductors was proposed in previous reports [18][19][20]. In current measurement (temperature range 160 ∘ C < substrate < 270 ∘ C), the O − and O 2− oxygen ions are the dominant species on the surface of metal oxide semiconductors.…”

Ni₂O₃ Decoration of WO₃ Thin Film for High Sensitivity NH₃ Gas Sensor

“…Nanostructural sensor has been shown to exhibit maximum response when the sensor condition (doping and size) is close to the total depletion condition. 9) Therefore, if the p-n junction formation drove the WO 3 layer near the total depletion condition, the sensor response can be enhanced by the Ni 2 O 3 -decoration. Second, the decoration of Ni 2 O 3 nanoparticles on WO 3 films produced higher surface roughness and area, which leads to increase in gas absorption sites.…”

“…SWCNTs were conventionally synthesized for 4 min with 40 A cm ¹2 arc discharge current density under 5.3 © 10 4 Pa hydrogen atmosphere. 8,9) As the source of Ni, four Ni wires with 0.2 mm diameter were inserted into a hollow graphite tube. SWCNTs with dispersed Ni metal catalyst particles were then coated onto the WO 3 film.…”