A dimethyl disulfide gas sensor based on nanosized Pt-loaded tetrakaidecahedral α-Fe₂O₃nanocrystals

Abstract

Surface modification by employing precious metals is one of the most effective ways to improve the gas-sensing performance of metal oxide semiconductors (MOS). Pure α-Fe2O3 nanoparticles and Pt-modified α-Fe2O3 nanoparticles were prepared sequentially using a rather simple hydrothermal synthesis and impregnation method. Compared with the original α-Fe2O3 nanomaterials, the Pt-α-Fe2O3 nanocomposite sensor shows a higher response value (Ra / Rg= 58.6) and a shorter response/recovery time (1 s / 168 s) to 100 ppm DMDS gas at 375 °C. In addition, it has better selectivity to dimethyl disulfide (DMDS) gas with the value of more than 9 times higher than the other target gases at 375 °C. This study indicates that the Pt-α-Fe2O3 nanoparticle sensor has good prospects and can be used as a low-cost and effective DMDS gas sensor.

Delafossite CuGaO2-Based Chemiresistive Sensor for Sensitive and Selective Detection of Dimethyl Disulfide

“…32,33 We could achieve a high response (3.2) to 100 ppb DMDS and a low LoD of 3.3 ppb by PTMoperated CuGaO 2 sensor in comparison with the state-of-theart DMDS sensors. 2,11,12,14 In addition, we have developed a smart DMDS monitoring system (comprising selective CuGaO 2 sensor, reading electronics, Bluetooth module, and App on mobile phone), which enables to accurately and selectively monitor DMDS vapor under ambient humid air background, even with the presence of four kinds of interference VOCs, demonstrating the practical application potential of the present CuGaO 2 sensor in environmental DMDS odor monitoring.…”

“…For example, the perovskite-type LaFeO 3 sensor shows a high response of 127 in dry air and approximately 90 in 95% relative humidity (RH) to 100 ppm DMDS at 210 °C . Noble metal (Pt/PdO)-modified α-Fe 2 O 3 sensor shows a response of 58.6/113.1 to 100 ppm DMDS at a high operating temperature of 375/335 °C. , AuPd bimetal alloy catalyst modification has been proposed to activate the response (36.6) of the SnO 2 sensor to 10 ppm DMDS gas at a lower operating temperature of 135 °C. However, serious response deterioration (about 60% off) has been observed when the RH increased from 46 to 96% .…”

“…1 DMDS could irritate the eyes, nose, and throat. 2,3 Chronic exposure may cause serious respiratory disorders such as bronchitis and asthma, as well as neurological and developmental issues such as headaches, dizziness, and memory loss. In addition, DMDS can react with other pollutants to produce sulfuric acid, contributing to acid rain, 4 which harms vegetation and damages aquatic ecosystems.…”

“…Besides industrial applications in catalysts (for hydrodesulfurization), sulfiding agents, pesticides, etc., DMDS can be naturally emitted by bacteria, fungi, plants, and animals and frequently causes serious odor pollution around the solid waste landfills in cities . DMDS could irritate the eyes, nose, and throat. , Chronic exposure may cause serious respiratory disorders such as bronchitis and asthma, as well as neurological and developmental issues such as headaches, dizziness, and memory loss. In addition, DMDS can react with other pollutants to produce sulfuric acid, contributing to acid rain, which harms vegetation and damages aquatic ecosystems.…”

“…In comparison with bulky analyzing equipment such as gas chromatography–mass spectroscopy, ,, metal oxide semiconductor (MOS)-based chemiresistive sensors, ,− featured by low cost, long lifetime, and easy microminiaturization and integration, act as the ideal candidate for developing smart Internet of Things-enabled sensing electronics. Recently, various types of MOS-type DMDS sensors have been reported.…”