کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
746443 | 1462125 | 2009 | 8 صفحه PDF | دانلود رایگان |

ZnO nanomaterial with multi-microstructures is synthesized by using normal pressure thermal evaporation and then doped with different Al2O3 contents by grinding in an agate mortar. The as-prepared Al-doped ZnO nanomaterials are characterized by X-ray diffraction and scanning electron microscopy. The characterization results show that all the compounds are wurtzite with hexagonal structure and are well crystallized. Channels/connecting holes arising from many kinds of ZnO microstructures are abundant. Both annealing and Al2O3-doping contributes to an increase in the quasi-one-dimensional and tri-dimensional microstructures. The as-prepared Al-doped ZnO nanomaterials show excellent gas responses to ethanol. The sensing mechanism of the ZnO-based nanomaterials with multi-microstructures is further analyzed by using the Effective Specific Surface Model. Excellent sensitivity (∼200) companied with short response time (∼8 s) and recovery time (∼10 s) to 3000 ppm ethanol is obtained with a ZnO-based sensor with 2 at.% Al2O3 at the operating temperature of ∼290 °C after the sensor is annealed at 500 °C.
Journal: Sensors and Actuators B: Chemical - Volume 140, Issue 2, 16 July 2009, Pages 549–556