Institute of Micro-nano Structures & Optoelectronics, Wenzhou University, Wenzhou, Zhejiang 325035, P. R. China.
Science and Technology on Vacuum & Cryogenics Technology and Physics Laboratory, Lanzhou Institute of Physics, Lanzhou, Gansu 730000, P. R. China.
Nanoscale. 2016 Mar 14;8(10):5599-604. doi: 10.1039/c5nr08661b.
An innovative hydrogen sensing concept is demonstrated based on the field emission from multi-walled carbon nanotubes, where the low emission currents rise in proportion to hydrogen partial pressures above 10(-9) Torr. Experimental and first principles studies reveal that the sensing mechanism is attributed to the effective work function reduction from dissociative hydrogen chemisorption. The embedded Ni catalyst would assist both the hydrogen dissociation and work function reduction. This technique is promising to build miniature low cost hydrogen sensors for multiple applications. This work is valuable for studies of nanocarbon-gas reaction mechanisms and the work function properties in adsorption related applications, including field emission, hydrogen storage, energy cells, and gas sensing.
基于多壁碳纳米管的场发射，展示了一种创新的氢气传感概念，其中在 10（-9）托以上的氢气分压下，低发射电流呈比例上升。实验和第一性原理研究表明，传感机制归因于来自离解氢化学吸附的有效功函数降低。嵌入的 Ni 催化剂将有助于氢的离解和功函数的降低。这种技术有望为多种应用构建微型低成本氢气传感器。这项工作对于研究纳米碳-气体反应机制和吸附相关应用中的功函数性质很有价值，包括场发射、储氢、电池和气体传感。
