Detection and analysis of structural changes in MoO3/Ag heterostructure by ultrafast transient absorption spectroscopy

Ultrafast transient absorption spectroscopy (UFTS) is a widely used technique to determine the change in optical parameters on laser irradiation and can highlight the pathways and the lifetime of decay of the charge carriers. Here, UFTS was used to detect the structural changes occurring in a MoO3/A...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2021-03, Vol.604, p.412697, Article 412697
Main Authors: Vashistha, Nikita, Kumar, Amit, Vij, Mahak, Singh, Rajiv K., Kumar, Mahesh
Format: Article
Language:English
Subjects:
Absorption spectroscopy
Comparative studies
Crystal structure
Crystalline
Crystallinity
Current carriers
Dealloying
Drying
Etching time
Heterostructure
Heterostructures
Molybdenum
Molybdenum oxides
Molybdenum trioxide
Nanoparticles
Nanoporous clusters
Spectrum analysis
Studies
Surface plasmon resonance
Thin films
Ultrafast transient absorption spectroscopy
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Summary:Ultrafast transient absorption spectroscopy (UFTS) is a widely used technique to determine the change in optical parameters on laser irradiation and can highlight the pathways and the lifetime of decay of the charge carriers. Here, UFTS was used to detect the structural changes occurring in a MoO3/Ag heterostructure because of dewetting and dealloying. A comparative study of transient absorption behavior of samples exposed to different temperatures indicated a change in phase and crystallinity of the film. Later through GI-XRD, it was concluded that the MoO3 film has become crystalline at 350 °C along α-(110) plane. A wide plasmonic band in UFTS data of dealloyed sample followed by FESEM showed randomly distributed Ag-Mo nanoporous clusters (315 nm - 6 μm). Tuning of surface plasmon resonance (~19 nm) was seen with etching time. This study proves UFTS's suitability for correlating the structural change in a film or heterostructure of films with spectroscopic results.
ISSN:0921-4526
1873-2135
DOI:10.1016/j.physb.2020.412697