样品的形貌对CeO2湿度传感器性能的影响

使用Ce(NO3)3·6H2O为前驱物,采用水热合成法和溶胶凝胶法分别制备了不同形貌的CeO2纳米晶体(纳米带和球形颗粒).通过XRD、SEM和TEM技术表征了材料的相成分、微结构和形貌.将样品制备成湿度传感器后对传感器性能进行了测试,结果表明:具有纳米带形貌的样品所制备的传感器展示了良好的传感性能,其响应-回复时间分别为7 s 和7 s(在15;~95;湿度范围内),最大迟滞为4;,这些性能都要好于球形颗粒所制备的样品.其主要原因是纳米带样品具有较大的比表面积.

Influence of Different Morphologies on the Performance of CeO2 Humidity Sensor

CeO2 nanocrystalline with different morphologies (nanobelts and nanoparticles) were synthesized via hydrothermal and sol-gel methods with Ce(NO3)3·6H2O as precursor.The phase structures and morphologies of products were investigated by XRD, SEM and TEM.The performance of humidity sensors fabricated by both samples were evaluated in detail.Qualitative analyses indicate that the morphologies of products has a significant effect on the properties of sensor.The sensor fabricated by nanobelts shows higher sensitivity, fast response (7 s) and rapid recovery (7 s) charateristics(15%-95%RH), and the maximum humidity hysteresis is 4% in the test humidity range compared with nanoparticles sample.The excellent performance of nanobelts sample can be attributed to the large specific surface area.