V2O5 Thin Films as Nitrogen Dioxide Sensors †

Abstract

Vanadium pentoxide thin films were deposited onto insulating support by means of rf reactive sputtering from a metallic vanadium target. Argon-oxygen gas mixtures of different compositions controlled by the flow rates were used for sputtering. X-ray diffraction at glancing incidence (GIXD) and Scanning Electronic Microscopy (SEM) were used for structural and phase characterization. Thickness of the films was determined by the profilometry. It has been confirmed by GIXD that the deposited films are composed of V2O5 phase. The gas sensing properties of V2O5 thin films were investigated at temperatures from range 410–617 K upon NO2 gas of 4–20 ppm. The investigated material exhibited good response and reversibility towards nitrogen dioxide. The effect of metal-insulator transition (MIT) on sensor performance has been observed and discussed for the first time. It was found that a considerable increase of the sensor sensitivity occured above 545 K, which is related to postulated metal-insulator transition.

Iron(II) Clathrochelates in Molecular Spintronic Devices: A Vertical Spin Valve

“…This makes it possible to create a required configuration of the spintronic device with an opposite magnetization of the electrodes to provide spin filtration and, hence, magnetoresistance [25,28,59]. A layer of vanadium oxide V 2 O 5 , whose dielectric properties [65,66] combined with high uniformity upon deposition [67] allows using it as a tunneling barrier in spintronic devices, served as the insulator.…”

Role of Polyvinylpyrrolidone (PVP) on Controlling the Structural, Optical, and Electrical Properties of Vanadium Pentoxide (V2O5) Nanoparticles

“…The activation energies were extracted from the slope of fitted curves. The TCRs were calculated using Equation (5). A summary of all the extracted parameters is shown in Tables 5 and 6.…”

“…This interest stems from the fact that the size tunability of V 2 O 5 nanoparticles offers major advantage over their bulk counterparts. The chemical and thermal stability of V 2 O 5 make it a suitable material in various applications such as electrochromic and optical switching devices, [2] catalysis, [3] cathode material for lithium-ion batteries, [4] gas sensors, [5] super capacitors, [6] and in bolometers. [7] Since many of these applications require appropriate size and size distribution.…”

Synthesis of naked vanadium pentoxide nanoparticles

“…18 and 19) and this property has been successfully used to build nitrogen dioxide sensors. 20 Additionally, V 2 O 5 is also used in photo-detectors. 21 Vanadium pentoxide has three polymorphs, a-V 2 O 5 (orthorhombic), b-V 2 O 5 (monoclinic or tetragonal) and d-V 2 O 5 (orthorhombic).…”