A novel room temperature ethanol gas sensor based on 3D hierarchical flower-like TiO2 microstructures

Low-Dimensional Nanostructures Based on Cobalt Oxide (Co3O4) in Chemical-Gas Sensing

“…Ethanol is a VOC that is vastly present in the daily life of human beings in means of food, beverages, fuel-processing, pharmaceutical, as well as in many laboratories and industries for diverse research and applications [72]. However, the long-term exposure to C 2 H 5 OH has been identified as the main reason for serious health effects such as lethargy, irritation to skin and eye, difficulty breathing, coma, liver damage, and intoxication.…”

“…Acetone is a VOCs known to be caused by irritation to nose, eyes, throat, and central nervous system as the concentration is higher than 173 ppm or if the exposure continues for several hours [60,72]. Moreover, it has been identified as a key compound to identify health issues in human body by analyzing the human breath [67,75].…”

“…These nanochains have shown superior selectivity toward H2S among other tested gases (NH3, H2, and CO). Moreover, the response stability was measured over a period of five months and response and recovery time were 46 s and 24 s. Additionally, the principal mechanisms of H2S detection would be interesting to mention [Equation (11)] to conclude the discussion on H2S detection [64,72]. 2H2S + 3O2¯→ 2H2O + 2SO2 + 3e − (12)…”

“…The weight change was noticed in 30-200 • C and 200-400 • C temperature range in TG-DTA, corresponding to the removal of absorbed water and oxidation of Co(CO 3 ) 0.5 (OH).11H 2 O into Co 3 O 4 .These nanochains have shown superior selectivity toward H 2 S among other tested gases (NH 3 , H 2 , and CO). Moreover, the response stability was measured over a period of five months and response and recovery time were 46 s and 24 s. Additionally, the principal mechanisms of H 2 S detection would be interesting to mention [Equation(11)] to conclude the discussion on H 2 S detection[64,72].…”

Rationally Designed TiO2 Nanostructures of Continuous Pore Network for Fast‐Responding and Highly Sensitive Acetone Sensor

“…Among various MOS, TiO 2 has been extensively studied for gas sensor applications due to its unique electrical and optical properties due to a wide bandgap of 3.1 eV with catalytic effects. [19] Moreover, their nontoxicity, low cost, and high environmental stability can be other advantages of TiO 2 for gas sensor application. [18] Although 2D materials, [20][21][22][23] organic-inorganic hybrid perovskites, [24,25] or light-activated materials [26][27][28] have been suggested for the active sensor materials for energy-efficient gas sensing, their selectivity has been limited only to highly reactive gases unless other additives are incorporated.…”