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Title: Photonically-activated molecular excitations for thermal energy conversion in porphyrinic compounds
Authors : Zhao, Yuan
Lin, Jou
Kundrat, David M.
Bonmarin, Mathias
Krupczak, John
Thomas, Som V.
Lyu, Mengyao
Shi, Donglu
et. al : No
Published in : Journal of Physical Chemistry C
Publisher / Ed. Institution : American Chemical Society
Issue Date: 18-Dec-2019
License (according to publishing contract) : Licence according to publishing contract
Type of review: Peer review (publication)
Language : English
Subject (DDC) : 540: Chemistry
Abstract: Heterocyclic, macrocycle organic compounds, structurally characterized with porphyrins, are not only abundant in nature but also environmentally friendly. These porphyrinic compounds have recently been extensively studied for their fascinating structures, physical properties, and high potentials in engineering applications. We report experimental results on the photonically activated thermal energy conversion via irradiations of white light (simulated solar light). The photothermal effects have been well studied for metallic conductors with a large number of charge carriers based on the so-called localized surface plasmon resonance (LSPR). However, the LSPR model may not apply to the porphyrinic materials with a very limited number of charge carriers. In this study, we have found several porphyrinic compounds to exhibit pronounced photothermal effects including chlorophyll, chlorophyllin, hemoglobin, and phthalocyanine, which all share similar structural characteristics. Raman data show characteristic molecular vibrations from these compounds that are responsible for photon-to-thermal energy conversions near the optical absorption frequencies. We attribute the porphyrin molecular vibrations to the photothermal effects observed from these compounds and predict that all porphyrinic materials can be optically activated for pronounced photothermal effects. Also established is a newly defined specific photothermal coefficient (SPC), a unique photothermal property of the thin films investigated in this study.
Further description : This document is the Accepted Manuscript version of a Published Work that appeared in final form in the Journal of Physical Chemistry C, copyright ¬©American Chemical Society after peer review and technical editing by the publisher.
Departement: School of Engineering
Organisational Unit: Institute of Computational Physics (ICP)
Publication type: Article in scientific journal
DOI : 10.1021/acs.jpcc.9b09374
ISSN: 1932-7447
Restricted until : 2020-12-18
Appears in Collections:Publikationen School of Engineering

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