Electrospun TiO2 nanofibre-based gas sensors fabricated by AC electrophoresis deposition

Abstract

In this paper, gas sensing properties of the sensor based on titanium dioxide (TiO 2 ) nanofibres are reported. These nanofibres were synthesized through electrospinning of polyvinyl pyrrolidone (PVP) / titanium tetra isopropoxide. Calcination of the obtained amorphous PVP/TiO 2 nanofibres resulted in nanofibres of TiO 2 with the same morphology. In this step, scanning electron microscopy and X-ray diffraction were applied in order to analyse these nanofibres. Then, nanofibres of TiO 2 were deposited selectively by AC electrophoretic deposition on interdigitated electrodes and exposed to different concentrations of NO 2 (8-50 p.p.m.) at 450-550 • C. Gas sensing measurements illustrated that this sensor had adequate response to target gas at 450 • C. The maximum response of gas sensors, S (the ratio of sensor resistances S = R gas /R N2 ), achieved was around 30 for 50 p.p.m. NO 2 at 450 • C.

The use of transient electrolysis in the technology of oxide composite nanostructured materials: review

“…Accumulated experimental data [13][14][15][16][17] show that in many cases transient electrolysis allows one to achieve effects that either cannot be achieved using a direct current or can be achieved in a much more complicated fashion. The ability to affect an electrochemical process more efficiently and flexibly due to the change of a mode and frequency variation of amplitudes for both anodic and cathodic current pulses is an undeniable advantage for transient electrolysis.…”

“…Nano-scale particles of a cerium oxide (CeO 2 ) were obtained [28] from 0.1 M Ce(NO 3 ) 2 aqueous solution under polarization using an alternating current on the surface of a platinum electrode, the size of a particle being regulated by electrolysis conditions (pH and component electrolyte composition, temperature, current density), which set this method apart from other precipitation [29,30], pyrolysis [31], hydrothermal [32][33][34][35][36] and sonochemical [37][38][39] synthetic methods. Nanostructured coatings based on titanium oxide were obtained as a result of electrophoretic deposition under the influence of an asymmetrical alternating current [16]. This method also has a number of advantages compared to other widely-used nanocrystal titanium dioxide methods [40][41][42][43][44][45].…”

Highly Sensitive Detection of Benzene, Toluene, and Xylene Based on CoPP-Functionalized TiO2 Nanoparticles with Low Power Consumption

“…Nanostructured titanium dioxide (TiO 2 ) has received great attention in a variety of applications including photocatalyst, dye-sensitized solar cell, and cosmetics . Among these, its application as a chemiresistive material for gas sensors has been actively studied owing to its stability and reliability at high temperature. , Therefore, TiO 2 -based gas sensors such as nanoparticles, − nanotubes, − nanowires, − and electrospun nanofibers − have been extensively developed regardless of their geometry. − …”