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Hot carrier generation in two-dimensional silver nanoparticle arrays at different excitation wavelengths under on-resonant conditions
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Date
2020-05-30
Authors
Takeuchi, Yuki
Violas, Antoine
Fujita, Tetsuya
Kumamoto, Yasuaki
Modreanu, Mircea
Tanaka, Takuo
Fujita, Katsumasa
Takeyasu, Nobuyuki
Journal Title
Journal ISSN
Volume Title
Publisher
ACS Publications
Published Version
Abstract
We evaluated the hot carrier generation in two-dimensional (2D) silver nanoparticle (AgNP) arrays under light illumination at different wavelengths, 458, 532, 671, and 785 nm. The 2D AgNP arrays were tailored to match the plasmon resonance to each excitation wavelength in order to fulfill the on-resonant condition. We selected para-aminothiophenol (p-ATP) as a probe molecule, which is chemically transformed into 4,4'-dimercaptoazobenzene (DMAB) upon light illumination. The reaction is driven by hot carriers emitted from a plasmonic surface. For evaluation of hot carrier generation, we monitored the chemical transformation from p-ATP into DMAB with surface-enhanced Raman scattering. The normalized Raman intensity of DMAB was plotted against the total exposure, where the peak intensity increased as the total exposure increased because of the increase of the number of DMAB molecules. The saturation of the peak growth was observed, indicating that the chemical transformation was completed, at different exposures for each wavelength. The total exposure required for completing the chemical transformation was smaller at 458 nm by at least ~105 times than that at 785 nm, although the difference of the photon energy was only 1.7 times. The growth of the Raman peak was related to the laser intensity as well, where the higher laser intensity showed a more rapid growth. These results indicated that more hot carriers with sufficient energy for the chemical transformation were generated at shorter excitation wavelengths as well as at higher laser intensities.
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Keywords
Hot carrier , Two-dimensional , 2D , Silver nanoparticle , AgNP , Light illumination , Plasmon resonance , Excitation wavelength
Citation
Takeuchi, Y., Violas, A., Fujita, T., Kumamoto, Y., Modreanu, M., Tanaka, T., Fujita, K. and Takeyasu, N. (2020) 'Hot carrier generation in two-dimensional silver nanoparticle arrays at different excitation wavelengths under on-resonant conditions', Journal of Physical Chemistry C, 124(25), pp. 13936-13941. doi: 10.1021/acs.jpcc.0c04034
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Copyright
© 2020, American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of Physical Chemistry C after technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/abs/10.1021/acs.jpcc.0c04034