Chromatic annuli formation and sample oxidation on copper thin films by femtosecond laser

We report an experimental investigation on the irradiation of copper thin films with high repetition rate femtosecond laser pulses (1040 nm, 50 MHz), in ambient air and liquid water. We observe a novel, striking phenomenon of chromatic copper oxides (CuO and Cu2O) annuli generation. The characterist...

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Bibliographic Details
Published in:The Journal of chemical physics 2016-04, Vol.144 (16), p.164703-164703
Main Authors: He, Shutong, Amoruso, Salvatore, Pang, Dongqing, Wang, Chingyue, Hu, Minglie
Format: Article
Language:English
Subjects:
Annuli
Copper
COPPER OXIDES
Dependence
ELECTRON SCANNING
EXPERIMENTAL DATA
Femtosecond pulses
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
IRRADIATION
LASERS
MHZ RANGE 01-100
Nanoparticles
OXIDATION
Raman spectroscopy
Repetition
SCANNING ELECTRON MICROSCOPY
Submerging
THIN FILMS
Water
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Summary:We report an experimental investigation on the irradiation of copper thin films with high repetition rate femtosecond laser pulses (1040 nm, 50 MHz), in ambient air and liquid water. We observe a novel, striking phenomenon of chromatic copper oxides (CuO and Cu2O) annuli generation. The characteristic features of the chromatic copper oxide annuli are studied by exploiting micro-Raman spectroscopy, optical and scanning electron microscopies. In the case of irradiation in water, the seldom investigated effects of the immersion time, tw , after irradiation with a fixed number of pulses are analyzed, and an intriguing dependence of the color of the chromatic annuli on tw is observed. This remarkable behavior is explained by proposing an interpretation scenario addressing the various processes involved in the process. Our experimental findings show that Cu2O nanoparticles (size of ≈20 nm) and Cu2O nanocubes (nanocube edges of ≈30, ≈60 nm) can be effectively generated by exploiting high repetition rate laser-assisted oxidation.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.4947224