Mono-, multi-layer nanostructured porous films and gas sensors

F. Sun, W. Cai, Yuenkei Li, L. Jia, Fang Lu
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Abstract

A simple and flexible strategy is presented for synthesis of mono or multi-layer nanostructured ordered porous films on any desired substrates with flat or even curved surface, based on the fact that polystyrene sphere colloidal monolayer on glass substrate can lift off and floated on some precursor solutions, which can, in turn, be transferred onto any substrates by picking it up. SnO/sub 2/ ordered nanostructured porous films are thus successfully synthesized on the cylindrical surface, the concave surface and the spherical surface, respectively, just by taking the easily acquired SnCl/sub 4/ solution as precursor. More importantly, the mono and multi-layer porous films are also directly synthesized on commercially supplied ceramic or porcelain tubes which are used for the substrate of gas sensors. And hence, the SnO2 ordered nanostructured porous gas-sensor is constructed. Sensitivity of the sensor can be easily controlled by changing the sizes of polystyrene spheres. Such method is universal and suitable for synthesis of many other oxides or doped porous films, mesoporous/macroporous gas sensor films and even the hetero-multi-layer porous films on the curved surfaces just by changing the compositions of the precursors or alternatively repeating this strategy. This strategy provides a good way to construct nanostructured gas-sensors and practical possibility of the nanostructured devices in the near future.
单层、多层纳米结构多孔膜和气体传感器
基于玻璃基板上的聚苯乙烯球形胶体单层可以悬浮在一些前驱体溶液上,而这些前驱体溶液又可以通过吸附转移到任何基板上,因此提出了一种简单而灵活的策略,可以在任何表面平坦或弯曲的基板上合成单层或多层纳米结构有序多孔膜。以易获得的SnCl/sub - 4/溶液为前驱体,分别在柱面、凹面和球面上成功合成了SnO/sub - 2/有序纳米结构多孔膜。更重要的是,单层和多层多孔膜也可以直接在市售的陶瓷或陶瓷管上合成,这些管用于气体传感器的衬底。因此,构建了SnO2有序纳米结构多孔气体传感器。传感器的灵敏度可以通过改变聚苯乙烯球的大小来控制。该方法是通用的,适用于通过改变前驱体的组成或交替重复该策略,合成许多其他氧化物或掺杂多孔膜,介孔/大孔气体传感器膜,甚至曲面上的异质多层多孔膜。该策略为构建纳米结构气体传感器提供了良好的途径,并在不久的将来为纳米结构器件的实际应用提供了可能性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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