Block copolymer-templated gasochromic WO3 thin films with uniform mesopores for fast optical hydrogen sensing.
- Resource Type
- Article
- Authors
- Wu, Xuan; Guo, Xingwu; Gao, Chenjing; Nie, Lewen; Peng, Liming; Chen, Juan
- Source
- International Journal of Hydrogen Energy. Jan2024, Vol. 53, p184-192. 9p.
- Subject
- *TUNGSTEN trioxide
*THIN films
*MESOPORES
*HYDROGEN detectors
*ETHYLENE oxide
*OPTICAL sensors
*BLOCK copolymers
- Language
- ISSN
- 0360-3199
A method to prepare mesoporous WO 3 thin films (represented by MP-WO 3) with a uniform pore size of ∼18 nm is developed successfully by utilizing poly(ethylene oxide)-b-polystyrene (PEO-b-PS) as the structure-directing agent (SDA). The properties of the gasochromic MP-WO 3 thin film are studied in detail and compared with the control groups prepared by using homopolymer PEO, PS, or their mixtures as SDA. Utilizing an optimized thermal treatment procedure, the gasochromic MP-WO 3 thin film of which the transmittance change Δ T is 59.1% exhibites the fastest coloration and bleaching speed with a coloration time of 27.3 s and a bleaching time of 19.7s as well as excellent reversibility within 90 cycles. This study offers a new strategy and insight into the development of mesoporous WO 3 hydrogen gasochromic films with excellent performances and paves its way toward the application of an optical hydrogen sensor. • Block copolymer-templated Pt/WO 3 thin films exhibit excellent gasochromic properties. • Nanoporous WO 3 thin films with large uniform spherical mesopores were prepared. • Higher thermal stability of the mesostructure is achieved by stepped heat treatment. • Block copolymer is a better template than homopolymer for gasochromic WO 3 thin film. [ABSTRACT FROM AUTHOR]