Porous Zn2TiO4–ZnO microtubes have been successfully fabricated using chemical precipitation followed by a calcination process using a carbon fiber template. The porous Zn2TiO4–ZnO microtubes with a diameter of ~ 4 μm consisted of Zn2TiO4 and ZnO nanoparticles. These displayed worm-like pore structures. Carbon fibers played an important role during the porous Zn2TiO4–ZnO microtube formation process. The porous and hollow structure of Zn2TiO4–ZnO provided abundant active sensing sites and channels for gas adsorption and diffusion. The porous Zn2TiO4–ZnO microtubes exhibited improved gas sensing properties for acetone when compared with pure ZnO. The Zn2TiO4–ZnO sensor response was 33.4 for 100 μg·ml−1 acetone at the optimum operating temperature (370 °C). This was ~ 2.7 times higher than that of pure ZnO. Additionally, the as-prepared porous Zn2TiO4–ZnO microtubes displayed sufficient long-term acetone stability and selectivity. This showed the potential application for acetone detection. The enhanced Zn2TiO4–ZnO gas sensing properties are due to the unique heterogeneous and porous structure, which was analyzed using the porous and band structure.

中文翻译：

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多孔Zn2TiO4-ZnO微管的制备及其丙酮气敏特性分析

多孔 Zn2TiO4-ZnO 微管已成功地使用化学沉淀和使用碳纤维模板的煅烧工艺制造。直径约 4 μm 的多孔 Zn2TiO4-ZnO 微管由 Zn2TiO4 和 ZnO 纳米颗粒组成。这些显示出蠕虫状的孔隙结构。碳纤维在多孔 Zn2TiO4-ZnO 微管形成过程中发挥了重要作用。Zn2TiO4–ZnO 的多孔中空结构为气体吸附和扩散提供了丰富的活性传感位点和通道。与纯 ZnO 相比，多孔 Zn2TiO4-ZnO 微管对丙酮表现出更好的气敏特性。在最佳操作温度 (370 °C) 下，100 μg·ml-1 丙酮的 Zn2TiO4-ZnO 传感器响应为 33.4。这比纯 ZnO 高约 2.7 倍。此外，所制备的多孔 Zn2TiO4-ZnO 微管显示出足够的长期丙酮稳定性和选择性。这显示了丙酮检测的潜在应用。增强的 Zn2TiO4-ZnO 气敏特性是由于独特的异质和多孔结构，使用多孔和带结构进行分析。