Electrospun ZnO–SnO2 Composite Nanofibers and Enhanced Sensing Properties to SF6 Decomposition Byproduct H2S

Abstract

Hydrogen sulfide (H2S) is an important decomposition component of sulfur hexafluoride (SF6), which has been extensively used in gas-insulated switchgear (GIS) power equipment as insulating and arc-quenching medium. In this work, electrospun ZnO-SnO2 composite nanofibers as a promising sensing material for SF6 decomposition component H2S were proposed and prepared. The crystal structure and morphology of the electrospun ZnO-SnO2 samples were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM), respectively. The composition of the sensitive materials was analyzed by energy dispersive X-ray spectrometers (EDS) and X-ray photoelectron spectroscopy (XPS). Side heated sensors were fabricated with the electrospun ZnO-SnO2 nanofibers and the gas sensing behaviors to H2S gas were systematically investigated. The proposed ZnO–SnO2 composite nanofibers sensor showed lower optimal operating temperature, enhanced sensing response, quick response/recovery time and good long-term stability against H2S. The measured optimal operating temperature of the ZnO–SnO2 nanofibers sensor to 50 ppm H2S gas was about 250°C with a response of 66.23, which was 6 times larger than pure SnO2 nanofibers sensor. The detection limit of the fabricated ZnO–SnO2 nanofibers sensor toward H2S gas can be as low as 0.5 ppm. Finally, a plausible sensing mechanism for the proposed ZnO–SnO2 composite nanofibers sensor to H2S was also discussed.

Advance of Nano-Composite Electrospun Fibers in Periodontal Regeneration

“…Electrospinning has gained more and more attention for the reason that it is widely recognized as a powerful tool for fabricating nanoscale materials with controllable fiber diameter, porosity, ideal morphology, and optimized surface characteristics (Lu et al, 2018). Electrospinning utilizes a polymeric solution or melt to generate nanofibers in high electrostatic field.…”

Electrospun Metal Oxide Nanofibers and Their Conductometric Gas Sensor Application. Part 2: Gas Sensors and Their Advantages and Limitations

“…However, it must be admitted that sensors manufactured using traditional technology, with appropriate optimization of the structure and composition of the gas-sensitive layer, can have the same parameters and, in some cases, even exceed the parameters reported for the best samples of nanofiber-based gas sensors [197,251,297,[374][375][376]. This means that no breakthrough has been achieved in the development of gas sensors based on the use of electrospinning technology, which could manifest itself in a radical improvement in the parameters of devices in comparison with conventional technology.…”

“…It is important to note that such structures can be created both in the electrospinning process and using the principles of post-treatments. For example, Lu et al [251] [262]. Subsequently, nanofibers with the specified structure were used in the manufacture of gas sensors (see Table 7).…”

Volatile Organic Compounds Gas Sensors Based on Molybdenum Oxides: A Mini Review

“…Currently, there are two common techniques-photo ionization detector (PID) and flame ionization detector (FID)-to detect VOCs, however, the application of these methods in industry are limited due to the relatively high cost and complicated maintenance. Considering the characteristics of small size, low cost, and convenient fabrication, semiconductor gas sensor technology plays an important role in many fields (Lu et al, 2018;Xiao et al, 2018;Zhang D. Z. et al, 2018;Zhang Q. Y. et al, 2018;Zhou et al, 2018cZhou et al, , 2019Wang et al, 2019a;Wei et al, 2020), so it is reasonable to propose the employment of a gas sensor to realize the online monitoring of VOCs.…”