Xing Ruiqing, Du Yang, Zhao Xiaonan, Zhang Xiu
Tianjin Key laboratory of Wireless Mobile Communications and Power Transmission, Tianjin Normal University, Tianjin 300387, China.
College of Electronic and Communication Engineering, Tianjin Normal University, Tianjin 300387, China.
Sensors (Basel). 2017 Mar 29;17(4):710. doi: 10.3390/s17040710.
A three-dimensional inverse opal (3DIO) WO₃ architecture has been synthesized via a simple sacrificial template method. Morphology features of the 3DIO were characterized by scanning electron microscope (SEM) and its structure was characterized by X-ray diffraction (XRD). The shrinking ratio of the PMMA spheres was ~28.2% through measuring the distribution of the PMMA spheres and 3DIO WO₃ center-to-center distance between the spheres and macropores, respectively. Beyond that, the 3DIO gas sensing properties were investigated systematically and the sensing mechanism of 3DIO WO₃ was proposed. The results indicated that the response of the 3DIO sensor possessed excellent sensitivity to acetone gas, especially at trace levels. The 3DIO gas sensor response was ~7 to 5 ppm of acetone and could detect acetone low to 0.2 ppm effectively, which was in close proximity to the theoretical low detection limit of 0.14 ppm when R/R ≥ 1.2 was used as the criterion for reliable gas sensing. All in all, the obvious satisfaction of the gas-sensing properties was ascribed to the structure of the 3DIO, and the sensor could be a promising novel device in the future.
通过一种简单的牺牲模板法合成了三维反蛋白石（3DIO）WO₃结构。用扫描电子显微镜（SEM）表征了3DIO的形貌特征，并用X射线衍射（XRD）表征了其结构。通过分别测量聚甲基丙烯酸甲酯（PMMA）球体的分布以及球体与大孔之间的3DIO WO₃中心距，PMMA球体的收缩率约为28.2%。除此之外，系统研究了3DIO的气敏性能，并提出了3DIO WO₃的传感机制。结果表明，3DIO传感器对丙酮气体具有优异的灵敏度，尤其是在痕量水平下。3DIO气体传感器对5 ppm丙酮的响应约为7，并且能够有效检测低至0.2 ppm的丙酮，当以R/R≥1.2作为可靠气敏的标准时，这与0.14 ppm的理论低检测限非常接近。总而言之，气敏性能的明显优势归因于3DIO的结构，并且该传感器在未来可能成为一种有前景的新型器件。
