Highly selective and sensitive detection of methyl mercaptan by heterostructural CdS/(Sr_0.6Bi_0.305)₂Bi₂O₇ chemiresistor

Abstract

Methyl mercaptan (MM) is one kind of volatile sulfur compounds (VSCs) with odor and similar properties (inflammable, highly toxic and corrosive) to H2S, highly sensitive and selective monitoring of ambient...

Ultrasensitive and Exclusive Chemiresistors with a ZIF-67-Derived Oxide Cage/Nanofiber Co3O4/In2O3 Heterostructure for Acetone Detection

“…Figure f, the inset of Figures f, and S10 show responses as a function of acetone concentration at 300 °C and their fittings, respectively, suggesting a linear relationship at low concentrations. We can evaluate the limit of detection (LOD) of the sensors in practical applications based on the formula LOD = 3RMS noise / k , ,, where k is the slope of the calibration curve and RMS noise is the root-mean-square noise. The calculated LODs of CIO-1, CIO-2, and CIO-3 and pure In 2 O 3 -based sensors are 80.3 18.8, 88.9, and 143 ppb, respectively, and CIO-2 shows the lowest LOD value among these sensors.…”

“…It can be seen that the sensing response decreases gradually as the RH increases. This is due to the presence of moisture in the air, which has a strong affinity for metal oxide surfaces and occupies active sites on the material surface by forming −OH groups, hindering the adsorption of acetone molecules . Consequently, at high RH levels, there is a decrease in active sites, leading to a decline in the sensing response.…”

“…This is due to the presence of moisture in the air, which has a strong affinity for metal oxide surfaces and occupies active sites on the material surface by forming −OH groups, hindering the adsorption of acetone molecules. 42 Consequently, at high RH levels, there is a decrease in active sites, leading to a decline in the sensing response. We have compared the operating temperature, response value, and response time for our work with other reported In 2 O 3 -based acetone gas sensors, as shown in Figure 5f and listed in Table S3.…”

Visual Detection of Mercaptan Gases Using Silver Nanoparticles-Based Colorimetric Sensor Array

“…To date, numerous approaches for mercaptan gas detection have been reported, including instrumental analysis, fluorescence techniques, and electrochemistry semiconductor sensors. , Although these methods have shown promise, they have limitations such as the inability to provide continuous real-time onsite monitoring and incapacity to simultaneously detect multiple analytes, especially in emergency situations . Additionally, they were easily interfered with by environmental factors …”