Hierarchically porous ZnO with high sensitivity and selectivity to H2S derived from biotemplates
Hierarchically porous ZnO with high sensitivity and selectivity to H2S derived from biotemplates
复制标题
分级多孔 ZnO 对生物模板衍生的 H2S 具有高灵敏度和选择性
DOI：
10.1016/j.snb.2008.10.043
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发表时间：
2009-03-02
影响因子：
8.4
通讯作者：
Xu, Jiaqiang
中科院分区：
文献类型：
--
作者：
Liu, Zhaoting;Fan, Tongxiang;Xu, Jiaqiang
以Lauan和杉木为模板，通过简单的水热生物启发方法成功合成了层次化多孔木模板氧化锌。根据FESEM、TEM、汞孔率和N-2吸附研究，制备过程中模板类型和煅烧温度对ZnO的形貌和多孔结构有较大影响。以H-2、CO、H2S、NH3、甲醛、甲醇、乙醇、丙酮和异丁烯为原料，研究了木模板化和非模板化ZnO的气敏性能。详细研究了木材模板、煅烧温度、气流工作温度对气敏性和选择性的影响。结果表明，由于继承了木材的层次化多孔结构，木模板氧化锌对H2S具有优异的敏感性和选择性。第一模板氧化锌对H2S的传感响应比未模板氧化锌高约5.1倍。在600℃下煅烧的第一模板ZnO具有最好的传感性能，包括最高的气敏响应，最高的H2S选择性系数，最短的响应和恢复时间。从气体性质、气固反应、晶粒尺寸和分级孔微观结构等关键方面讨论了选择性传感机理。(C) 2008 Elsevier B.V.版权所有
Hierarchical porous wood-templated ZnO has been successfully synthesized using Lauan and Fir woods as template through a simple hydrothermal bioinspired approach. The template type and calcination temperature in the preparation process have a large effect on the morphologies and Porous Structures of ZnO according to FESEM, TEM, mercury porosimetry and N-2 adsorption investigations. The gas sensing performances of wood-templated and non-templated ZnO were investigated using H-2, CO, H2S, NH3, Formaldehyde, Methanol, Ethanol, Acetone, and Isobutene. The article studies the effects of wood template, calcination temperature, and working temperature of gas flow on the gas sensitivity and selectivity in detail. It is revealed that wood-templated ZnO has excellent sensitivity and selectivity to H2S due to inheritance of wood's hierarchical porous structure. The sensing response to H2S of Fir-templated ZnO is about 5.1 times higher than that of non-templated ZnO. Fir-templated ZnO calcined at 600 C, has the best sensing properties including the highest gas sensing response, the highest selectivity coefficients of H2S and the shortest response and recovery time. The selective sensing mechanism has been discussed from some key aspects, such as gas properties, gas-solid reactions, grain size and hierarchical porous microstructures. (C) 2008 Elsevier B.V. All rights reserved.