The distinguished Hydrogen Sensibility by selecting diameters of Single-Walled Carbon Nanotubes and Adding Sensitive Materials

• Published in: International journal of hydrogen energy Vol. 50; pp. 870 - 877
• Main Authors: Zhang, Zhifeng, Yang, Yexin, Zhu, Songlin, liu, Yinke, Shi, Yan, Song, Jiangfeng, Ren, Guangkun, Deng, Shunjie, Tian, Xiaofeng, Zheng, Zhe
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 02-01-2024
• Subjects: fast recovery; HKUST-1; hydrogen sensors; Semiconducting single-walled carbon nanotube; Semiconducting single-walled carbon nanotube; fast recovery; HKUST-1; hydrogen sensors
• ISSN: 0360-3199; 1879-3487
• DOI: 10.1016/j.ijhydene.2023.07.211

Hydrogen sensors based on palladium (Pd)/semiconducting single-walled carbon nanotube(s-SWNTs) have showed great performance in sensitivity, limit of detection (LOD), and response time. With the development of research, it is proved that diameters and chirality of s-SWNTs strongly influence the detection. In this paper, we fabricated two kinds of sensors with different diameters, and that results showed response of sensor with 0.7 - 1.2 nm s-SWNTs was almost 6 times higher than that of the one with 1.2 - 1.6 nm s-SWNTs. The former could achieve the response of change ≈ 6.09 for 1ppm H2 in N2, and the latter was ≈ 1.07. Furthermore, with Pd/HKUST-1 as functionalization for capturing more hydrogen (H2), the system formed a synergistic effect to enhance the change of resistance. The fabricated Pd/HKUST-1/s-SWNTs film (0.7 - 1.2 nm) H2 sensor presents a very fast recovery time of 8 s at 10 ppm and a detection limit of 1 ppm H2 in nitrogen(N2). In addition, in the air the sensor can also work. Its response time of the sensor to 0.05% H2 in air are 0.183 s. By choosing the diameter of s-SWNTs and adding H2-sensitive materials, the sensors are expected to achieve the fast response and recovery with high sensitivity and low LOD.
•Investigated the relationship between diameters or chirality of s-SWNTs and responsivity of hydrogen sensor.•Explored the function of MOF additive as a cage to storage hydrogen.•Searched the possibility of high responsivity of hydrogen sensor in air.