Abstract
In this paper, we study the influence of two key factors, temperature, and humidity, on gas sensors based on titanium dioxide nanowires synthesized at 4 different temperatures and with different morphology. The samples’ structure are investigated using SEM, XRD and FTIR analysis. The effects of humidity and temperature are studied by measuring the resistance and gas response when exposed to ethanol. At room temperature, we observed a 15% sensitivity response to 100 ppm of ethanol vapor and by increasing the operating temperature up to 180 °C, the response is enhanced by two orders of magnitude. The best operating temperature for the highest gas response is found to be around 180 °C. Also, it was observed that every nanowire morphology has its own optimum operating temperature. The resistance of sensors is increased at higher Relative Humidity (RH). Besides, the response to ethanol vapor experiences a gradual increase when the RH rises from 10% to 60%. On the other hand, from 60% to 90% RH the gas response decreases gradually due to different mechanisms of interaction of the TiO2 with H2O and ethanol molecules.
Highlights
Titanium dioxide (TiO2) is an important metal oxide semiconductor (MOS) that is desirable for many applications, such as pigment [1], solar cells [2], optical waveguides [3], filters [4], and gas sensors [5]
In this paper, we study the influence of two key factors, temperature, and humidity, on gas sensors based on titanium dioxide nanowires synthesized at 4 different temperatures and with different morphology
The sensors response were obtained at the presence of ethanol vapor at different concentrations which were provided by evaporating an exact amount of liquid ethanol, which was measured by a micro sampler, into the air chamber
Summary
Titanium dioxide (TiO2) is an important metal oxide semiconductor (MOS) that is desirable for many applications, such as pigment [1], solar cells [2], optical waveguides [3], filters [4], and gas sensors [5]. Researchers present their properties via quantum confinement and surface effect by reducing the size of TiO2 crystals to nanoscale dimensions [6, 7]. Based on the obtained results, optimal growth and testing conditions of gas sensing to reduce the effect of humidity and temperature are discussed
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