Enhancement of Signal Intensity for Inverse Photoelectron Spectroscopy by Surface Plasmon Resonance of Ag Nanoparticles

[ABSTRACT] Information concerning the unoccupied states of condensed matter is of great relevance to their electronic, optical and chemical properties. These unoccupied states can be directly examined by inverse photoelectron spectroscopy (IPES), which is often regarded as the time-inversion process of photoelectron spectroscopy (PES). The fundamental drawback of IPES is its low signal intensity. Other spectroscopic intensities are enhanced by surface plasmon resonance (SPR), so the intensity of the IPES signal may also be enhanced by SPR. This was, however, impossible because the photon energy involved in conventional IPES exceeds 9 eV and is much higher than the SPR energy of existing materials. In 2012, we developed low-energy IPES (LEIPS), in which the photon energy is less than 5 eV, which can then be matched with the SPR energy. We demonstrate a 5-fold enhancement of the LEIPS signal from a prototypical organic semiconductor, copper phthalocyanine (CuPc), by SPR of Ag nanoparticles.

https://opac.ll.chiba-u.jp/da/curator/900120907/

https://opac.ll.chiba-u.jp/da/curator/900120907/Usui JPCC(2019).pdf

American Chemical Society

Journal Article

The Journal of Physical Chemistry C

123

47

28789

28794

2019

https://doi.org/10.1021/acs.jpcc.9b08814

eng

https://doi.org/10.1021/acs.jpcc.9b08814

author

This document is the Accepted Manuscript version of a Published Work that appeared in final form in The Journal of Physical Chemistry C, copyright (c) 2019 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.jpcc.9b08814.