School of Physics and Laboratory of Zhongyuan Light, Zhengzhou University, Zhengzhou 450052, China.
School of Materials Science and Engineering, Peking University, Beijing 100871, China.
ACS Sens. 2024 Oct 25;9(10):5197-5205. doi: 10.1021/acssensors.4c01342. Epub 2024 Oct 2.
Carbon nanotubes (CNTs) had room temperature response, large surface area, and excellent mechanical properties, making them favorable for the design of flexible, wearable, and portable gas sensors. However, CNTs were lacking in response and selective response to different gases, such as HS. Here, we demonstrated a flexible HS ppb-level gas sensor based on a carbon nanotube/amorphous FeO (CNT/FeO) film at room temperature, which was fabricated via a simple one-step solvent-thermal method. The CNT/FeO film gas sensor exhibited a high selective response to HS (with a response of 55.1% to 100 ppb HS), rapid reversible response at room temperature (with a response time of ∼127 s to 100 ppb HS), and low limit of detection to about 2 ppb. Additionally, the CNT/FeO film maintained good sensing performance under various bending conditions and could be further fabricated into the fiber gas sensor device via wet stretching, retaining response at the ppb level (with a response of 18.6% to 100 ppb HS). This research on a flexible gas sensor device based on the CNT film/fiber opened up new possibilities for wearable portable electronic device applications.
碳纳米管（CNTs）具有室温响应、大比表面积和优异的机械性能，使其成为设计灵活、可穿戴和便携式气体传感器的理想选择。然而，CNTs 在对不同气体（如 HS）的响应和选择性响应方面存在不足。在这里，我们展示了一种基于碳纳米管/非晶态 FeO（CNT/FeO）薄膜的室温下的 HS ppb 级气体传感器，该传感器是通过简单的一步溶剂热法制备的。CNT/FeO 薄膜气体传感器对 HS 表现出高选择性响应（对 100 ppb HS 的响应为 55.1%），在室温下具有快速可逆响应（对 100 ppb HS 的响应时间约为 127 s），检测限低至约 2 ppb。此外，CNT/FeO 薄膜在各种弯曲条件下仍保持良好的传感性能，并且可以通过湿拉伸进一步制成纤维气体传感器装置，在 ppb 级（对 100 ppb HS 的响应为 18.6%）保留响应。这项基于 CNT 薄膜/纤维的柔性气体传感器装置的研究为可穿戴便携式电子设备的应用开辟了新的可能性。
