Synthesis of functionalized mesoporous TiO2-SiO2 with organic fluoroalcohol as high performance DMMP gas sensor

HFIP‐Functionalized Co3O4 Micro‐Nano‐Octahedra/rGO as a Double‐Layer Sensing Material for Chemical Warfare Agents

“…Also in the Co 3 O 4 ‐COOH spectrum, the bands at 1073, 937, and 805 cm −1 indicate the formation of Si‐O‐Si . After treatment with C 3 F 6 O ⋅ 3 H 2 O (red curve), the creation of HFIP decoration on the surface of Co 3 O 4 is confirmed by the appearance of three small bands at 1629, 1550, and 1401 cm −1 , which are attributed to the stretching vibration bands of ‐CONH‐, C=C, and ‐CF 3 , respectively . The band at 3404 cm −1 is attributed to the stretching vibration of O−H bonds, which are produced from the adsorbed water molecules .…”

“…Alternatively, the DMMP can bond with the HFIP organic compounds through hydrogen‐bonding interactions, which further decreases the density of the holes in the conduction band of the sensing material. As the hydrogen bonds will be formed between the C‐OH part of HFIP and P=O part of DMMP, this enables the selectivity of rGO/Co 3 O 4 ‐HFIP sensors toward DMMP molecules to be distinguished . In brief, the advanced sensing performance of the double‐layer rGO/Co 3 O 4 ‐HFIP sensor is attributed to the functionalization with HFIP, which enhances the selectivity toward DMMP molecules.…”

“…This inhibition will lead to rapid death owing to reduced breakdown of acetylcholine in the nervous system . Thus, the early detection of these nerve agents in urban areas has become a critical issue since the sarin attack on the Tokyo subway in 1995 . Dimethyl methyl phosphonate (DMMP) is a general simulant gas for sarin nerve gas owing to its nontoxicity, similarity in chemical structure (chemical formula of DMMP is C 4 H 10 FO 2 P, and sarin is C 3 H 9 O 3 P), and organophosphorus compound composition .…”

Gas sensors based on mass-sensitive transducers. Part 2: Improving the sensors towards practical application

“…Zong et al successfully functionalized hollow mesoporous silica spheres with poly(dopamine) to detect formaldehyde released from food 11 [117]. Bonding p-hexafluoroisopropanol aniline to mesoporous TiO 2 -SiO 2 , Zhu et al measured concentrations of nerve agent simulant dimethyl methyl phosphonate (DMMP) down to 100 ppbv [118]. The sensing material was coated on Q-TSMRs.…”

Quartz Crystal Microbalance Electronic Interfacing Systems: A Review

“…The aforementioned effects are more representative for most microbalance applications, yet, other spurious factors (e.g., pressure and stress) may also cause additional minor frequency shifts that should be taken into account when present [ 15 ]. Generally, QCMs are used as chemical and biological sensors for mass, viscosity, temperature and humidity measurements, in addition to recently being used as gas sensors in some applications [ 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 ]. Quantitatively, 569 published works tackled molecular recognition studies based on QCM sensors from 2001 and 2005 [ 36 ], compared to 857 works focusing on QCM’s chemical and biochemical applications between 2006–2009 [ 37 ].…”