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From the Surface Reaction Control to Gas-Diffusion Control: The Synthesis of Hierarchical Porous SnO2 Microspheres and Their Gas-Sensing Mechanism
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2015-07-06 00:00:00 , DOI: 10.1021/acs.jpcc.5b01397 Xiaobing Wang , Yuanyuan Wang , Fei Tian , Huijun Liang 1 , Kui Wang , Xiaohua Zhao , Zhansheng Lu , Kai Jiang , Lin Yang , Xiangdong Lou
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2015-07-06 00:00:00 , DOI: 10.1021/acs.jpcc.5b01397 Xiaobing Wang , Yuanyuan Wang , Fei Tian , Huijun Liang 1 , Kui Wang , Xiaohua Zhao , Zhansheng Lu , Kai Jiang , Lin Yang , Xiangdong Lou
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A series of hierarchical porous SnO2 microspheres (SnO2-Ms) with same sizes of nanoparticles were fabricated through increasing the reaction time of the one-step hydrothermal method. Especially, these SnO2-Ms also have the different specific surface areas and pores sizes. When they are applied in sintering type thick film gas sensors, through comparing the gas-sensing property of the as-prepared SnO2-Ms, it can clearly demonstrate that the surface chemical reaction (SCR) control of the sensing properties of sensors is gradually replaced by gas diffusion control with the increasing operation temperature (To). For the first time, this dual control is discovered through contrast experiments. According to the testing results, the sensing mechanism of sensors can be explained by many factors, such as the reaction rate constant of the SCR, the Knudsen diffusion coefficient of the target gas, the To, the specific surface area, the pore size, and the change of the H2O, etc. A pore canal model and a hollow sphere model are introduced, which can effectively explain the sensing mechanism of gas sensors. This discovery can make up for the inadequacy of the surface-control and the diffusion-control theory, and expound their interrelationship. This discovery also provides a novel strategy for studying the sensing mechanism of sensors, which is expected to open up exciting opportunities for improving the sensing properties of the gas-sensing materials and studying some gas–solid catalytic phenomena.
中文翻译：
从表面反应控制到气体扩散控制：SnO 2多孔多孔微球的合成及其气敏机理
一系列分级多孔的SnO 2微球（的SnO 2 -MS）与纳米颗粒的大小相同是通过增加一步法水热法的反应时间制成。特别地，这些SnO 2 -Ms也具有不同的比表面积和孔尺寸。当将它们应用于烧结型厚膜气体传感器中时，通过比较所制备的SnO 2 -Ms的气敏特性，可以清楚地表明，表面化学反应（SCR）对传感器感测特性的控制正在逐步进行。随工作温度升高（T o）。首次通过对比实验发现了这种双重控制。根据测试结果，传感器的感应机理可以用许多因素来解释，例如SCR的反应速率常数，目标气体的Knudsen扩散系数，T o，比表面积，孔径，和H 2的变化O等。介绍了一个孔道模型和一个空心球模型，可以有效地解释气体传感器的传感机制。这一发现可以弥补表面控制和扩散控制理论的不足，并阐明它们之间的相互关系。这一发现也为研究传感器的传感机理提供了一种新颖的策略，有望为改善气体传感材料的传感特性和研究某些气固催化现象提供令人兴奋的机会。
更新日期：2015-07-06
中文翻译：
从表面反应控制到气体扩散控制：SnO 2多孔多孔微球的合成及其气敏机理
一系列分级多孔的SnO 2微球（的SnO 2 -MS）与纳米颗粒的大小相同是通过增加一步法水热法的反应时间制成。特别地，这些SnO 2 -Ms也具有不同的比表面积和孔尺寸。当将它们应用于烧结型厚膜气体传感器中时，通过比较所制备的SnO 2 -Ms的气敏特性，可以清楚地表明，表面化学反应（SCR）对传感器感测特性的控制正在逐步进行。随工作温度升高（T o）。首次通过对比实验发现了这种双重控制。根据测试结果，传感器的感应机理可以用许多因素来解释，例如SCR的反应速率常数，目标气体的Knudsen扩散系数，T o，比表面积，孔径，和H 2的变化O等。介绍了一个孔道模型和一个空心球模型，可以有效地解释气体传感器的传感机制。这一发现可以弥补表面控制和扩散控制理论的不足，并阐明它们之间的相互关系。这一发现也为研究传感器的传感机理提供了一种新颖的策略，有望为改善气体传感材料的传感特性和研究某些气固催化现象提供令人兴奋的机会。
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