Enhanced Photo-Assisted Acetone Gas Sensor and Efficient Photocatalytic Degradation Using Fe-Doped Hexagonal and Monoclinic WO 3 Phase−Junction
Ji-Chao Wang, Weina Shi, Xue-Qin Sun and 3 more
Nanomaterials · 2020
doi:10.3390/nano10020398 (opens in a new tab)
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Abstract
The development of WO<sub>3</sub>-based gas sensors for analysis of acetone in exhaled breath is significant for noninvasive diagnosis of diabetes. A series of Fe-doped hexagonal and monoclinic WO<sub>3</sub> phase−junction (Fe−<i>h/m</i>−WO<sub>3</sub>) sensors were synthesized by the hydrothermal calcination method, and the influences of operating temperature and light irradiation on the response were studied. Under light emitting diode (LED) illumination, Fe−<i>h/m</i>−WO<sub>3</sub> exhibited higher responses to acetone than those of the undoped WO<sub>3</sub>-based sensors at an operating temperature of 260 °C with 90% relative humidity, and good linearity between response and acetone concentration (0.5 to 2.5 ppm) was achieved under the 90% relative humidity condition. Meanwhile, the optimal Fe−<i>h/m</i>−WO<sub>3</sub> sensor exhibited high selectivity and stability for a duration of three months. The excellent sensing performance of Fe−<i>h/m</i>−WO<sub>3</sub> was attributed to the formation of phase−junction and Fe doping, and these were beneficial for the separation of photon−generated carriers and oxygen adsorption on the WO<sub>3</sub> surface, promoting the generation of superoxide radicals, which was demonstrated by electron paramagnetic resonance and photocurrent tests. Additionally, the Fe−doped WO<sub>3</sub> phase−junction sample also showed good photocatalytic performance for rhodamine B degradation. This study may provide some insights into rational design of new types of gas sensors and offer an alternative for noninvasive diagnosis of diabetes.
Abstract licence: CC BY
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