Rapid and selective detection of acetone using hierarchical ZnO gas sensor for hazardous odor markers application

Synthesis of In2O3 hollow nanofibers and their application in highly sensitive detection of acetone

“…Moreover, the In 2 O 3 -2h nanofiber sensors display a maximum response of approximately 151 at 300 °C; this response is higher than that of In 2 O 3 -0h samples (108) and indicates that the formation of hollow structures is beneficial to the acetone sensing of nanofibers. The gas-sensing mechanism of In 2 O 3 is based on the conductivity changes caused by the adsorption and desorption of gas molecules on the material surface [3,32]. When the In 2 O 3 is exposed to air, Oxygen molecules are adsorbed on the surface of material, and the adsorbed oxygen species (O 2-, O -, and O 2-) are generated by capturing electrons from the conduction band, as represented in Eqs.…”

“…When the In 2 O 3 is exposed to air, Oxygen molecules are adsorbed on the surface of material, and the adsorbed oxygen species (O 2-, O -, and O 2-) are generated by capturing electrons from the conduction band, as represented in Eqs. (1)(2)(3)(4). Upon exposure to acetone, the possible reaction mechanism between the acetone molecules and the chemisorbed oxygen species may take place by two different ways [33,34].…”

“…The validity of acetone detection for type-1 diabetes diagnostics has been supported by extensive medical research [2,3]; the concentration of acetone in a breath exhaled by a healthy individual is lower than 0.8 ppm, whereas that in the breath exhaled by a diabetic patient is higher than 1.8 ppm [4,5]. Therefore, a high-performance acetone sensor must be developed for safety and health purposes.…”

A Review on the Fabrication of Hierarchical ZnO Nanostructures for Photocatalysis Application

“…Wang and his co-workers produced hollow ZnO microspheres via a one-pot template-free hydrothermal synthesis and found that the hollowness of these microspheres could be controlled by adjusting the zinc source concentration [72] (Figure 6). Ji et al [73] reported hierarchical nanostructured ZnO dandelion-like hollow spheres synthesized by a one-step solvothermal method. Using a similar route, hierarchical ZnO hollow spheres consisting of nanoparticles were prepared by a microwave-assisted solvothermal method [74].…”

Fabrication and characterization of layer-by-layer nano self-assembled ZnO nanorods/carbon nanotube film sensor for ethanol gas sensing application at room temperature

“…Among these nanomaterials, ZnO, as a typical n type semiconductor metal oxide [3,8], has been widely investigated due to its unique properties, such as nano-size, stable physical and chemical properties. Up to now, ZnO materials have been successfully used as sensing materials for detecting ethanol, toluene and so on by converting the information in relation with gas type and concentration into electrical signals when exposed to different gases [9][10][11]. However, the gas sensors fabricated with pure ZnO have some drawbacks including low sensitivity, long response and recovery times and high operation temperature [12][13][14].…”