Metal-organic frameworks-derived Co3O4/Ti3C2Tx Mxene nanocomposites for high performance ethanol sensing

In situ fabrication of a NiO nanoparticles/single-layered MXene nanosheet Schottky heterojunction toward sensing xylene and formaldehyde

“…Meanwhile, since the terminal groups (-OH, -O and -F) in Ti 3 C 2 T x nanosheets are hydrophilic, the reaction between Ti 3 C 2 T x and formaldehyde is inhibited. 44,49 Fig. 9d and g within ve cycles, and the response value, response/recovery speed do not change signicantly for all sensors, indicating the good repeatability of the sensors.…”

“…Meanwhile, since the terminal groups (–OH, –O and –F) in Ti 3 C 2 T x nanosheets are hydrophilic, the reaction between Ti 3 C 2 T x and formaldehyde is inhibited. 44,49 Fig. 9d and g show the dynamic response/recovery curves of the NiO and NiO–MXene based sensors to different concentrations of formaldehyde at 170 °C.…”

“…Xylene and formaldehyde gas molecules are readily adsorbed by these functional groups by forming strong hydrogen bonds, helping to enhance the sensing performance of the NiO–MXene based sensors. 49…”

“…Moreover, the Ti 3 C 2 T x MXene surface has a large number of functional groups, such as-OH, -O, and -F. Xylene and formaldehyde gas molecules are readily adsorbed by these functional groups by forming strong hydrogen bonds, helping to enhance the sensing performance of the NiO-MXene based sensors. 49 Finally, the distribution of oxygen species is closely related to the gas-sensing performance. As shown in the XPS plot, the O 1s peak of the sample is divided into three components, where the O L peak is correlated with lattice oxygen, the O V peak corresponds to O − ions near the decient region, and the O C peak is attributed to chemisorbed oxygen species and hydroxyl oxygen.…”

Highly Selective Ionic Gel-Based Gas Sensor for Halogenated Volatile Organic Compound Detection: Effect of Dipole–Dipole Interaction

“…Over the past few decades, chemiresistive sensors based on metal oxide semiconductors (MOSs) have attracted wide attention as a VOC detection technology due to their miniature size, high sensitivity, and rapid response. MOS gas sensors with high operation temperatures can easily cause redox reactions of most VOCs with their surface oxygen, by which a lot of research on the detection of alkanes, alcohols, ketones, and aromatic hydrocarbons has been reported. − Regretfully, MOS gas sensors do not seem to be an alternative technology to detect X-VOCs. The main reasons are as follows: on the one hand, higher operation temperatures are needed to oxidize the thermal-stable X-VOCs, which will accelerate the aging of MOS gas sensors and reduce their sensitivity; on the other hand, a poisoning effect will occur during the sensing process because the acidic gases in the decomposition products will corrode the metal oxide.…”