A fast response and recovery H2S gas sensor based on free-standing TiO2 nanotube array films prepared by one-step anodization method

Abstract

Free-standing TiNT array film was successfully synthesized by a one-step anodization method. The characteristic techniques including scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD) were adopted to characterize the morphology and chemical composition of the TiNT array film. Subsequently, gas sensor based on the TiNT array film was fabricated and its sensing performance toward H 2 S was investigated. The results showed that the optimum operating temperature to detect H 2 S gas was 300℃, the detection range to H 2 S gas was 1-50 ppm with the response value of 4.5-26.2, and a *Manuscript Click here to view linked References good linearity of sensing characteristics could be observed. Meanwhile, the response and recovery time of the sensor to 50 ppm H 2 S gas were as low as 22 s and 6 s, respectively. In addition, mechanisms of the development of the free-standing TiNT array film and the sensor towards H 2 S were discussed. In conclusion, its outstanding sensing properties and readily fabrication of the TiNT array film sensor presented the potential industrial applications.

Exploiting Free-Standing p-CuO/n-TiO2 Nanochannels as a Flexible Gas Sensor with High Sensitivity for H2S at Room Temperature

“…Table S1 shows the response of the CuO/TiO 2 nanochannel structure and a comparison with other high-temperature gas sensors based on other TiO 2 nanostructures, i.e., nanotubes, 38 nanoplates, 39 nanowires, 40 films, 41 and core−shell nanoparticles. 42 Benefitting from the both-end-open nanochannel structure and CuO/TiO 2 interfaces, the as-proposed sensing device in this study exhibits a satisfactory sensing response at room temperature, and its sensing performance is comparable to that of sensing devices operating at high temperatures.…”

All-Solid-State Lithium Ion Batteries Using Self-Organized TiO2 Nanotubes Grown from Ti-6Al-4V Alloy

“…The presence of the oxidation peaks at 1.93 V is attributed to the extraction of Li + from the cathode and their subsequent insertion into the anode material. By contrast, reduction peaks at 1.21 V are assigned to the extraction of Li + from the anode and their simultaneous insertion into the cathode according to the reactions given in Equations (10)- (12). Overall reaction:…”

“…[8]. Among the various nanostructured oxide materials, special attention has been directed to TiO 2 nanotubes (TiO 2 NTs) because they have been already explored for many applications such as solar cells [9][10][11], sensors [12,13], photocatalysis [14][15][16], and rechargeable batteries [17,18]. In addition, the TiO 2 NTs materials have been extensively studied as anode material, thanks to the high surface-to-volume ratio leading to the enhanced electrochemical properties [19].…”

Metal Oxide Nanostructures in Food Applications: Quality Control and Packaging

“…Various oxide materials and their compositions have been studied for the fabrication of H 2 S sensors [75][76][77][78][79][80][81][82][83][84]. Porous metal oxide nanostructures, such as TiO 2 , NiO, and CuO are very attractive materials for H 2 S detection [75][76][77]85]. They have shown a good response towards low concentrations of H 2 S. In addition, the porous NiO and CuO with p-type conductivity could detect H 2 S in ppb level at relatively low operating temperatures [76,77].…”