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.
Substrate temperature controls ZnO film thickness and grain size in this zinc-nitrate-precursor study, with the thinnest, highest-resistance film giving the strongest acetaldehyde response.
Switching the spray-pyrolysis precursor solvent between water and ethanol tunes ZnO film thickness from 875 down to 150 nm, producing a distinctive water-hyacinth nanostructure along the way.
Spray-pyrolysis ZnO films made with different water-ethanol precursor solvents show the ethanol-only film selectively detects ethanolamine at room temperature, with a stable response over 30 days.
A review of electronic-nose research across milk, wine, tea, coffee, fish, and meat quality monitoring finds shared sensor hardware and algorithms, with sensor drift and cost the main barriers to industrial adoption.
Adding chloride ions to an electrospinning precursor steers ZnO growth from nanospheres to pencil-like nanorods, and the nanorod morphology gives the strongest room-temperature ethanol response.
Fluorine doping shrinks ZnO crystallite size and increases micro-strain, and a 4 wt% fluorine-doped film gives the strongest, most selective room-temperature acetaldehyde response.
Precursor chemistry alone tunes spray-pyrolysis CeO2 sensing performance: the acetate-derived film forms nanosheets and gives the fastest, strongest room-temperature xylene response.
Cerium-doped ZnO thin films sense acetone and ethanolamine, breath biomarkers for diabetes and liver disorders, with dopant concentration tuned separately for each target.
Laser pulse duration controls the size and oxide-shell chemistry of tin nanoparticles made by ablating a tin target in water, with the resulting core-shell particles able to sense ethanol vapor.
Silica and titanium dioxide powders made by stirred bead milling were pressed into pellets and separately deposited as thin films to compare their room-temperature oxygen response.
