Ultra-sensitive hydrogen sulfide (H2S) detection technology at low temperatures provides critical support for the application of one-time alert systems under extreme conditions, ensuring reliable monitoring of H2S in low-temperature environments and enhancing safety and practicability. In this study, we developed a novel low-temperature H2S sensor based on Cu/Cu2O nanoarrays, prepared through a combination of 2D electrodeposition in situ assembly and the hydrothermal method. The heterointerface between Cu nanowires and Cu2O nanocubes presents a high barrier, which can be modulated to zero through the formation of continuous CuxS conductive channels via the vulcanization reaction, thereby achieving excellent sensitivity and selectivity towards H2S at low temperatures. At freezing temperatures and low H2S concentrations (≤20 ppm), the sensors show ideal recovery and reasonable sensitivity (R=150 to 10 ppm H2S at 0 °C). However, the response significantly increases (R=5624 at 10 ppm H2S at 50 °C) and recovery is lost under reversed conditions. First-principles calculations have confirmed that the enhanced H2S adsorption at the heterointerface is the primary reason for the robust response observed at 0 °C. Experimental results demonstrate that the Cu/Cu2O nanoarrays were capable of rapid detection of H2S at low temperatures through modulation of heterointerface barriers.

中文翻译：

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用于低温 H2S 传感的 Cu/Cu2O 纳米阵列的 2D 电沉积组装


超灵敏的低温硫化氢 （H2S） 检测技术为极端条件下一次性预警系统的应用提供了关键支撑，确保低温环境下 H2S 的可靠监测，增强安全性和实用性。在这项研究中，我们开发了一种基于 Cu/Cu2O 纳米阵列的新型低温 H2S 传感器，该传感器是通过 2D 电沉积原位组装和水热法相结合制备的。Cu 纳米线和 Cu2O 纳米立方体之间的异质界面呈现出高阻挡层，可以通过硫化反应形成连续的 CuxS 导电通道将其调制为零，从而在低温下实现对 H2S 的优异灵敏度和选择性。在冷冻温度和低 H2S 浓度 （≤20 ppm） 下，传感器显示出理想的恢复率和合理的灵敏度（0 °C 时 R=150 至 10 ppm H2S）。然而，响应显著增加（在 50 °C 下 10 ppm H2S 时 R=5624），并且在相反的条件下会损失回收率。第一性原理计算已经证实，异质界面处增强的 H2S 吸附是在 0 °C 时观察到稳健响应的主要原因。 实验结果表明，Cu/Cu2O 纳米阵列能够通过调制异质界面势垒在低温下快速检测 H2S。