Multivariate Evaluation Method for Screening Optimum Gas-Sensitive Materials for Detecting SF₆ Decomposition Products

Abstract

In previous studies, the selection of optimal gas-sensing materials for detecting target gases mainly relied on their response value, but other indices, such as the recovery capability of materials, have usually been overlooked. Here, we propose a new method for evaluating sensor effectiveness that includes a broader range of performance indices. In this study, four gas sensors based on metal-oxide semiconductors (WO3, CeO2, In2O3, and SnO2) were used as examples, and their performance in the detection of four decomposition products of sulfur hexafluoride (SF6) was investigated. After gas-sensing experiments, values for working temperature, response value, and recovery capability were obtained. A multivariate evaluation method of mixing principal component analysis, information entropy, and variation coefficient was developed to calculate the weights of various indices, and the sensors’ optimal working temperatures could be identified quantitatively. Using five variables (working temperature, response value, recovery capability, fluctuation rate, and detection limit), we continued to apply this multivariate evaluation method to calculate the weights and acquire comprehensive scores for the four sensors. Finally, these scores were used to identify the optimal materials for detecting SF6 decomposition products. This procedure has the potential for selecting the best sensors for other gases.

Low-Temperature Detection of Sulfur-Hexafluoride Decomposition Products Using Octahedral Co3O4-Modified NiSnO3Nanofibers

“…The details of sensor fabrication and measurement are presented in the Supporting Information, and the gas sensing setup is shown in Figure . The gas sensitivity is specified in this research as S = R 0 / R g , where R 0 and R g are the sensor resistances in the SF 6 gas and test gases, respectively . The sensor’s response/recovery interval is well defined as the interval the sensor took to attain 90% of its total resistance after inoculating and extracting the sensed gases.…”

“…The gas sensitivity is specified in this research as S = R 0 /R g , where R 0 and R g are the sensor resistances in the SF 6 gas and test gases, respectively. 30 The sensor's response/recovery interval is well defined as the interval the sensor took to attain 90% of its total resistance after inoculating and extracting the sensed gases. To ensure the accuracy of the findings, all sensor readings were evaluated under laboratory conditions at a low temperature (50 °C) and consistent humidity (40%), and the results were repeated multiple times to guarantee the consistency of the measurement.…”

“…SF 6 is extensively used in gas-insulated switches (GIS) and gas-insulated transmission lines (GIL) because of its outstanding arc extinguishing and insulation characteristics. , Spark discharge and partial discharge defects may develop during the long-term operation of the equipment, and the SF 6 gas decomposes to different low-fluorine sulfides (SF x ) due to high electrical discharge energy . The major breakdown products of SF 6 are sulfuryl fluoride (SO 2 F 2 ), thionyl fluoride (SOF 2 ), sulfur dioxide (SO 2 ), and hydrogen sulfide (H 2 S), which will damage and decrease the insulation strength of SF 6 -insulated equipment. − Therefore, an efficient technique for the accurate detection of SF 6 decomposition products is essential to guarantee the operational stability of SF 6 -insulated equipment . In the last decade, various methods, such as infrared absorption spectrometry, gas chromatography, and photoacoustic spectroscopy, have been used to detect and remove SF 6 breakdown products, but they have a lengthy detection cycle and are expensive, making them unsuitable for real-time gas composition analysis. − …”

Handheld Crop Pest Sensor Using Binary Catalyst-Loaded Nano-SnO2 Particles for Oxidative Signal Amplification

“…The chemoresistive technique gains appreciation for its simplicity since it can be handled even by unskilled persons, requires no sample preparation steps, and offers reusability of the sensor platform, tunable selectivity by working temperature, and compatibility to miniaturize. , Chemoresistive volatile sensors use metal oxide-based transducers, which exhibit a change in electrical resistance on exposure to the target gas by accepting or donating the electron from the oxidation or reduction of the analyte, respectively . The ability of the platform to show matching redox activity is the key to improve the sensitivity and selectivity . To achieve this, semiconductors and noble metals having catalytic facets for adsorption/desorption and reactivity , were engineered together for ppb/μM level of detection. , …”

“…14 The ability of the platform to show matching redox activity is the key to improve the sensitivity and selectivity. 15 To achieve this, semiconductors and noble metals having catalytic facets for adsorption/desorption and reactivity 16,17 were engineered together for ppb/μM level of detection. 18,19 According to the Food and Agriculture Organization (FAO), tomato is the second most important vegetable crop after potato.…”