Publications on chemiresistive and semiconductor gas sensors, mostly built from doped or nanostructured ZnO thin films, targeting ammonia, ethanol, acetaldehyde, xylene, and other vapors at room temperature. Each entry covers how the sensing film was made, what it detects, and how sensitive and selective it is.
A PANI-CdO nanocomposite with 10 wt% CdO outperforms the authors' earlier PANI-only sensor, reaching a room-temperature methanol response of 1580 with fast recovery.
A PANI-ZnO nanocomposite thin film with 20 wt% ZnO gives the strongest, most selective room-temperature methanol response among several tested loadings, responding in just 7 seconds.
Increasing the spray-pyrolysis precursor volume from 15 to 45 mL thickens ZnO films from 225 to 781 nm and raises conductivity, with the thicker film's open structure favoring gas sensing.
Raising the spray-pyrolysis substrate temperature shifts ZnO grain shape from spherical to pebble-like and strengthens the room-temperature ammonia response, peaking at 623 K.
Hydrothermal, solution-combustion, and microwave heating each shape V2O5 into a distinct nanostructure, with the solution-combustion nanoflowers giving the most selective ethanol response.
Ultrasonically treated, annealed carbon-nanotube networks show a striking dual response to ammonia: resistance rises with concentration, then drops three orders of magnitude above 2500 ppm.
Higher precursor concentration turns spray-pyrolysis V2O5 into interconnected, flower-like nanofibers that give the strongest, most selective room-temperature xylene response among eight tested vapors.
A template-free electrospinning route self-assembles ZnO into nanospheres, nanobushes, or pearl-chain nanowires, with the nanowire form reaching a room-temperature ethanol response of 78 at 100 ppm.
A nanopebble-textured ZnO film made by high-temperature spray pyrolysis selectively senses ammonia at room temperature down to 1 ppm.
A single sputter-deposited ZnO film shows the 'racetrack effect' creates a real spatial gradient in crystallite size, carrier mobility, and gas-sensing response across one nominally uniform substrate.
