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Reversible Rapid Hydrogen Doping of WO 3 in Non-Acid Solution.
- Source :
-
ACS applied materials & interfaces [ACS Appl Mater Interfaces] 2021 Mar 24; Vol. 13 (11), pp. 13419-13424. Date of Electronic Publication: 2021 Mar 12. - Publication Year :
- 2021
-
Abstract
- Hydrogenation, an effective way to tune the properties of transition metal oxide (TMO) thin films, has been long awaited to be performed safely and without an external energy input. Recently, metal-acid-TMO has been reported to be an effective approach for hydrogenation, but the requirement of acid limits its application. In this work, the reversible and rapid hydrogen doping of WO <subscript>3</subscript> in NaOH(aq) | Al(s) | WO <subscript>3</subscript> (s) is revealed by structural and electrical measurements. Accompanied by the structural phase transition identified by in situ X-ray diffraction, the electric resistance of the WO <subscript>3</subscript> film is found to be able to change by 5 orders of magnitude. A significant electrical response of touching, 8-fold in amplitude and 3 s in a cycle, can be achieved in the low-resistance state. These reactions are reversible at room temperature. This study unambiguously proves that the hydrogenation-driven dynamic phase transition of WO <subscript>3</subscript> in metal-solution-WO <subscript>3</subscript> systems could occur not only in acid solutions but also in some non-acid environments. Unlike the monotonic increase of resistance revealed during H <subscript>δ</subscript> WO <subscript>3</subscript> to WO <subscript>3</subscript> transition, an intriguing non-monotonic evolution was found for crystal lattice parameter c , indicating that the mechanism of WO <subscript>3</subscript> hydrogenation involves a series of metastable states, more comprehensive and reasonable. This work sheds light on the potential applications of metal-solution-TMO hydrogenation in touching sensors, circuits survey, and information storage.
Details
- Language :
- English
- ISSN :
- 1944-8252
- Volume :
- 13
- Issue :
- 11
- Database :
- MEDLINE
- Journal :
- ACS applied materials & interfaces
- Publication Type :
- Academic Journal
- Accession number :
- 33709704
- Full Text :
- https://doi.org/10.1021/acsami.1c01165