Highly sensitive and selective volatile organic compound gas sensors based on mesoporous nanocomposite monoliths
Highly sensitive and selective volatile organic compound gas sensors based on mesoporous nanocomposite monoliths
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DOI：
10.1039/c1ay05333g
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发表时间：
2011-09
影响因子：
3.1
通讯作者：
N. Hoa;S. El‐Safty
中科院分区：
文献类型：
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作者：
N. Hoa;S. El‐Safty
我们介绍了使用高度有序的介孔二氧化硅/金属氧化物（HOM/MO）纳米复合材料的挥发性有机化合物（VOC）气体传感器的应用。采用瞬时直接模板法制备了不同负载量的半导体金属氧化物（SnO 2、ZnO、NiO、CuO和Fe 2 O3）单块体。研究了掺杂元素和掺杂量对介孔结构的影响。结果表明，在高达40%的掺杂SnO 2的整料保持其有序的多孔结构。高分辨率透射电子显微镜和扫描透射电子显微镜的图像显示，SnO 2纳米晶体均匀分布在基质的HOM整料高达40%的掺杂浓度。研究了HOM/SnO 2和HOM/ZnO单块材料对丙酮、苯和乙醇的气敏性能。基于HOM/SnO 2纳米复合材料的传感器表现出最高的灵敏度，选择性，响应速度，和响应稳定性丙酮相比，与其他。这一发现提供了有趣的结果上的大规模合成HOM/MO整料的能力，以控制孔结构，并打开了一个新的策略中的应用介孔纳米复合材料的气体传感器。此外，各种HOM/MO纳米复合材料的单块容易通过该方法合成。它扩大了HOM/MO纳米复合材料的潜力，以其他应用，如催化和吸附。
We introduce the use of highly ordered mesoporous silica/metal oxide (HOM/MO) nanocomposite monoliths for volatile organic compound (VOC) gas sensor applications. Monoliths with various loadings of semiconducting metal oxides (SnO2, ZnO, NiO, CuO, and Fe2O3) were prepared through instant direct-templating method. The dependence of the doping elements and doping levels on the mesoporous structure of monoliths was investigated. The results indicate that the monoliths retained their ordered porous structure at up to 40% doping by SnO2. The high-resolution transmission electron microscopy and scanning transmission electron microscopy images revealed that the SnO2 nanocrystals were homogenously distributed in the matrix of the HOM monoliths up to 40% doping concentration. The gas-sensing properties of the HOM/SnO2 and HOM/ZnO monoliths to acetone, benzene, and ethanol were also investigated. Sensors based on the HOM/SnO2 nanocomposites showed highest sensitivity, selectivity, response rate, and response stability to acetone compared with the others. This finding provides interesting results on the large-scale synthesis of HOM/MO monoliths with the ability to control pore structure and opens a new strategy in the application of mesoporous nanocomposites for gas sensors. In addition, various HOM/MO nanocomposite monoliths are easily synthesized through this method. It expands the potential of HOM/MO nanocomposite monoliths to other applications, such as catalysis and adsorption.