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利用微流控技术在微通道中制备了Zn O纳米线阵列,通过X射线衍射和扫描电子显微镜分别对纳米线的物相和表面形貌进行了表征.结果发现,合成的Zn O纳米线具有良好的c轴择优取向性和结晶度.同时,对Zn O纳米线阵列在丙酮、甲醇和乙醇气体中的气敏特性进行了研究,测试结果表明:在最佳工作温度(475?C)下,纳米线阵列对200 ppm(1 ppm=10-6)丙酮气体的最大灵敏度可达8.26,响应恢复时间分别为9和5 s;通过与传统水热法制备的Zn O纳米线的气敏性能相比较发现,基于微流控技术制备的纳米线阵列具有更高的灵敏度和更快的响应恢复速度.最后,从材料表面氧气分子得失电子的角度对Zn O纳米线气敏机理进行了讨论.
The Zn O nanowire arrays were prepared by microfluidic technique in microchannels. The phase and morphology of the nanowires were characterized by X-ray diffraction and scanning electron microscopy, respectively. The results showed that the synthesized Zn O nanowires possessed Good c-axis preferred orientation and crystallinity.At the same time, the gas sensing properties of Zn O nanowire arrays in acetone, methanol and ethanol gas were studied.The results show that under the optimum working temperature (475? C) , The maximum sensitivity of the nanowire arrays to acetone gas at 200 ppm (1 ppm = 10-6) was 8.26 and the response recovery time was 9 and 5 s respectively. The gas sensitivity of Zn O nanowires prepared by the conventional hydrothermal method The nanowire arrays prepared by microfluidics show higher sensitivity and faster response recovery.Finally, the gas sensing mechanism of Zn O nanowires is discussed from the perspective of gain and loss of oxygen molecules on the surface of the material.