Abstract
Iron oxide (Fe2O3) nanopowder was prepared by a precipitation method and then mixed with different proportions of carbon nanotubes. The composite materials were characterized by X-ray powder diffraction, Fourier transform infrared spectroscopy and scanning electron microscopy. A fabricated heater-type gas sensor was compared with a pure Fe2O3 gas sensor under the influence of acetone. The effects of the amount of doping, the sintering temperature, and the operating temperature on the response of the sensor and the response recovery time were analyzed. Experiments show that doping of carbon nanotubes with iron oxide effectively improves the response of the resulting gas sensors to acetone gas. It also reduces the operating temperature and shortens the response recovery time of the sensor. The response of the sensor in an acetone gas concentration of 80 ppm was enhanced, with good repeatability.
Highlights
Since the discovery of carbon nanotubes, they have been the focus of nanomaterials research [1].One-dimensional carbon nanotubes have emerged as important nanomaterials because of their stable chemical properties [2], excellent electrical properties [3,4], larger specific surface area, and strong gas adsorption capacity
Since the iron oxide nanoparticles that were prepared by precipitation have a complete crystal structure, all the diffraction peaks are consistent with the peak of α-Fe2O3 (JCPDS No 33-0664), without any impurity peaks
It can be seen that the peak of the iron oxide is weakened by the doping with carbon nanotubes, but it is still clear due to the low amount of doping
Summary
Since the discovery of carbon nanotubes, they have been the focus of nanomaterials research [1]. One-dimensional carbon nanotubes have emerged as important nanomaterials because of their stable chemical properties [2], excellent electrical properties [3,4], larger specific surface area, and strong gas adsorption capacity. These properties have led to their use in making gas sensors that show excellent performance [5,6,7]. Iron oxide is used as a multifunctional semiconductor material, because of its good stability, high sensitivity, low price, and a simple preparation process, which are excellent features for a sensitive material [15,16,17]. The purified and chemically modified iron oxide nanopowder-doped carbon nanotube [22], the modification of carbon nanotubes by the iron oxide nanoparticles, and the performance of the gas sensor are investigated through experimentation
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