Application of Flower-Like ZnO Nanorods Gas Sensor Detecting Decomposition Products

Shudi Peng,Wei Song,Gaolin Wu,Qian Wang

doi:10.1155/2013/135147

Shudi Peng, Wei Song + Show 2 more

Open Access

https://doi.org/10.1155/2013/135147

Copy DOI

Abstract

Gas insulated switchgear (GIS) is an important electric power equipment in a substation, and its running state has a significant relationship with stability, security, and reliability of the whole electric power system. Detecting and analyzing the decomposition byproducts of sulfur hexafluoride gas (SF6) is an effective method for GIS state assessment and fault diagnosis. This paper proposes a novel gas sensor based on flower-like ZnO nanorods to detect typical SF6decompositions. Flower-like ZnO nanoparticles were synthesized via a simple hydrothermal method and characterized by X-ray powder diffraction and field-emission scanning electron microscopy, respectively. The gas sensor was fabricated with a planar-type structure and applied to detect SF6decomposition products. It shows excellent sensing properties to SO2, SOF2, and SO2F2with rapid response and recovery time and long-term stability and repeatability. Moreover, the sensor shows a remarkable discrimination among SO2, SOF2, and SO2F2with high linearity, which makes the prepared sensor a good candidate and a wide application prospect detecting SF6decomposition products in the future.

Highlights

Gas insulated switchgear (GIS) filled with pressurized sulfur hexafluoride gas (SF6) is widely used in electric power system in recent decades with the advantages of small floor space, high stability and reliability, high-strength insulation, none smeary oil, lower maintenance cost, and so on [1,2,3,4,5,6]
SF6 is of great chemical inertness and the reliability of GIS is very high, inevitable insulating faults based on arc discharge, spark discharge, or partial discharge may occur due to the internal insulating defects
Some low-fluorine sulfides are very active to react with trace moisture and oxygen and generate the compounds of SOF4, SOF2, SO2F2, SO2, HF, and so on

Summary

Introduction

Gas insulated switchgear (GIS) filled with pressurized sulfur hexafluoride gas (SF6) is widely used in electric power system in recent decades with the advantages of small floor space, high stability and reliability, high-strength insulation, none smeary oil, lower maintenance cost, and so on [1,2,3,4,5,6]. SF6 is of great chemical inertness and the reliability of GIS is very high, inevitable insulating faults based on arc discharge, spark discharge, or partial discharge may occur due to the internal insulating defects Researches both at home and aboard demonstrate that such internal insulation faults would cause SF6 gas to decompose, and generate several kinds of low-fluorine sulfides, such as SF4, SF3, and SF2 [2, 4, 5, 8, 9]. Metal oxide semiconductor gas sensor based on ZnO [14], SnO2 [15], TiO2 [16], Fe2O3 [17], WO3 [18], or In2O3 [19] has been widely used for detecting and online monitoring target gas, owing to advantages of simple fabrication process, rapid response and recovery time, low maintenance cost, long service life, long-term stability and repeatability, and so on. The prepared sensor exhibited excellent gas response to different SF6 decompositions at different working temperature with high linearity, rapid response-recovery, and long-time stability and repeatability

Experimental

Results and Discussion

Gas in

Conclusions