Facile fabrication of nanoflower-like WO3/WS2 heterojunction for highly sensitive NO2 detection at room temperature

Microwave-Assisted Hydrothermal/Impregnation Synthesis of Cu2O-Decorated rGO/In2O3 Nanorices for Sensitive SO2 Gas Sensors

“…The high-resolution In 3d spectra of all samples (Figure a) exhibited a single pair of In 3d 5/2 and In 3d 3/2 peaks observed at ∼444.9 and 452.5 eV, respectively. The pair could be corresponding to the In 3+ oxidation state of In 2 O 3 . , For oxygen, all core-level O 1s spectra (Figure b) could be decomposed into three parts, including O­(530.9–531.0 eV), O′(532.3 eV), and O″(533.5 eV), which could be attributed to the lattice oxygen, chemisorbed oxygen at surface vacancies and hydroxyl or dissociated oxygen species, respectively. , The amounts of chemisorbed oxygen species relative to all oxygen species of Cu-rGO/In 2 O 3 nanorices with 0, 0.5, 1.0, and 1.5 wt %Cu computed from the peak areas were 28.9, 31.1, 31.8, and 31.2%, respectively. Thus, the content of chemisorbed oxygen species increased slightly with increasing Cu content from 0 to 1.0 wt % before declining slightly at the highest Cu content of 1.5 wt %.…”

A highly efficient room-temperature NO2 gas sensor based on three-dimensional core–shell structured CoS2 bridged Co3O4@MoS2

“…The gas-sensing mechanism of the three-component heterojunction Co 3 O 4 –CoS 2 @MoS 2 -2 composite is primarily attributed to the variation in resistance when exposed to a NO 2 atmosphere. 40,41 Molybdenum disulfide nanosheets have high catalytic oxidation performance and form a heterostructure with Co 3 O 4 to speed up carrier transport. At the same time, the S atom in CoS 2 has a large capacity to hold electrons, which further promotes efficient carrier transport.…”

A 2D-0D-2D Sandwich Heterostructure toward High-Performance Room-Temperature Gas Sensing

“…This test system consists of the gas cylinder, an Al-alloy gas test chamber, a four-channel gas mass flow control module, and software for controlling and testing the gas. 53 Noted that the gas control precision of SD101 is 0.35%. The gas sensors were exposed to 0.005−50 ppm of NO 2 , 5 ppm of SO 2 , NH R a /R g for the NO 2 and SO 2 , while the S = R g /R a for NH 3 , H 2 S, CO, and H 2 .…”

“…All sample gases are dry and custom-made from the Nanjing Special Gas Co., Ltd., and the purities of all these gases are 99.9%. The whole detection process can be found in our previous work, 53 and all of the operation temperatures are 25 °C (room temperature). To investigate the reproducibility of WS 2 -BP and WS 2 -Au-BP heterostructures to different concentrations of NO 2 under various relative humidity (RH) levels, some samples were measured repeatedly 3−6 times.…”