Abstract In this study, a two-/three-dimension (2D/3D) architecture was designed and fabricated by a facile dip-calcination procedure. In this design, moss-like zinc ferrite (ZnFe2O4) was grown on the surface of 3D zinc oxide tetrapods (ZnO-T) to form a semiconductor heterostructure. This unique architecture features the merits of copious porosities that facilitate gas circulation and boost active gas-absorption sites, making it exceedingly applicable for gas detection. It was found that this architecture was very sensitive towards hydrogen sulfide gas (H2S, 2 ppm, 250 °C, 65% RH) with ultrafast response and recovery time of 2 and 9 s, respectively. Further, low-concentration gas tests at 250 °C, 65% RH unraveled that it showed quick response even when the concentration of H2S gas was as low as 0.6 ppb.

中文翻译：

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2-D 锌铁氧体“苔藓”覆盖在 3-D 氧化锌四足体上以提高硫化氢的检测灵敏度

摘要 在这项研究中，通过简单的浸渍煅烧程序设计和制造了二维/三维 (2D/3D) 结构。在该设计中，苔藓状铁酸锌 (ZnFe2O4) 生长在 3D 氧化锌四足体 (ZnO-T) 的表面上，以形成半导体异质结构。这种独特的结构具有大量孔隙的优点，可促进气体循环并促进活性气体吸收位点，使其非常适用于气体检测。发现该架构对硫化氢气体（H2S，2 ppm，250 °C，65% RH）非常敏感，具有超快响应和 2 秒和 9 秒的恢复时间，分别。此外，在 250 °C、65% RH 下的低浓度气体测试表明，即使 H2S 气体浓度低至 0.6 ppb，它也显示出快速响应。