Environmentally friendly room temperature synthesis and humidity sensing applications of nanostructured Bi₂O₂CO₃

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• 作者：Ying Zhou ; Haiyue Wang ; Min Sheng ; Qian Zhang ; Ziyan Zhao ; Yuanhua Lin ; Hongfei Liu ; Greta R. Patzke
• 关键词：Humidity sensor ; Layered structure ; Bi2O2CO3 ; Soft chemistry ; Oxide nanomaterials
• 刊名：Sensors and Actuators B: Chemical
• 出版年：2013
• 出版时间：November, 2013
• 年：2013
• 卷：188
• 期：Complete
• 页码：1312-1318
• 全文大小：2773 K

文摘

Bi₂O₂CO₃ nanosheets with exposed {0 0 1} facets were obtained from the straightforward and economic room temperature conversion of commercial Bi₂O₃ with CO₂ as atmospheric carbon source. The growth process of Bi₂O₂CO₃ was investigated with a variety of analytical methods including X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). (BiO)₄CO₃(OH)₂ was identified as an intermediate during the transformation of bulk Bi₂O₃ into Bi₂O₂CO₃ nanosheets. The humidity sensing tests indicated high sensitivities with impedance changes of 4 orders and capacitance changes of 3 orders of magnitude over a relative humidity (RH) range from 11 to 95 % . Moreover, the humidity sensor based on Bi₂O₂CO₃ nanosheets revealed a narrow humidity hysteresis, rapid response and recovery time with good reproducibility. These results demonstrated that Bi₂O₂CO₃ is a promising humidity sensing material for environmental monitoring and humidity control.