Reversible Rapid Hydrogen Doping of WO3 in Non-Acid Solution

• DOI: 10.1021/acsami.1c01165
• Publication Date: 2021-03-12T16:32:00Z
• Authors: Zhiping Bian; Jiangtao Zhao; Heng Cao; Yongqi Dong; Zhenlin Luo
• Keywords: Metastability

Hydrogenation, an effective way to tune the properties of transition metal oxide (TMO) thin films, has been long awaited be performed safely and without external energy input. Recently, metal-acid-TMO reported approach for hydrogenation, but requirement acid limits its application. In this work, reversible rapid hydrogen doping WO3 in NaOH(aq) | Al(s) WO3(s) is revealed by structural electrical measurements. Accompanied phase identified situ X-ray diffraction, electric resistance film found able change 5 orders magnitude. A significant response touching, 8-fold amplitude 3 s a cycle, can achieved low-resistance state. These reactions are at room temperature. This study unambiguously proves that hydrogenation-driven dynamic metal-solution-WO3 systems could occur not only solutions also some non-acid environments. Unlike monotonic increase during HδWO3 transition, intriguing non-monotonic evolution was crystal lattice parameter c, indicating mechanism hydrogenation involves series metastable states, more comprehensive reasonable. work sheds light on potential applications metal-solution-TMO touching sensors, circuits survey, information storage.