Field Emission Properties of Low-Temperature, Hydrothermally Grown Tungsten Oxide

Abstract

Tungsten oxide layers have been prepared on conductive glass substrates using aqueous chemical growth from a sodium tungstate precursor at low-temperature hydrothermal conditions. The deposits were then tested as cold electron emitters. Traceable layers could be deposited only within a narrow pH range of 1.5À2 at a time length not exceeding 4 h. Transmittance in the visible spectrum was found to decrease with deposition time. The presence of both monoclinic and hexagonal phases was always detected. At the longest deposition times and highest precursor concentrations, morphologies comprise randomly oriented spikes or rods. The overall emission performance is found to improve with growth time and precursor concentration. The role of morphology on the emission properties of the films is discussed.

Synthesis and Characterization of Tungsten Suboxide WnO3n−1 Nanotiles

“…The peaks at 702 and 428 cm −1 are blue-shifted, indic The oxygen O 1s spectrum can be deconvoluted into two peaks, as shown in Figure 6b. Peak at 530.5 eV, attributing 26% to the O 1s photoelectrons, corresponds to O 2− bonded to W 6+ in WO 3 [26]. Peak at 532.3 eV may correspond to oxygen O 2− bonded to SiO 2 (substrate), C-O bonds or lower oxidation states of O in W-O bonds.…”

Using an 80% CF4+20% CO2 gas mixture to recover aged anode wires in proportional chambers

“…At these tips, the electric field rises from EE2.5 Â 10 5 V/cm to E$ 10 7 V/cm. Therefore a layer of tungsten oxides might be a source of high field-emission electron current [21][22][23]. This stimulates the glow discharge generation and production of radicals and ions in the vicinity of the wire surface.…”

Synthesis and Characterization of Strontium Oxide Nano Particle by Sol-Gel Method

“…Nanoparticles synthesis with unique properties is a new area of research which is a great importance. There are various methods to synthesize these materials in liquid phase such as hydrothermal [15][16][17][18] , sol-gel [19][20][21][22] , micro emulsion and microbial processes, out of these methods sol gel is a simple and cost effective method 23 . Due to different…”