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Photonically-activated molecular excitations for thermal energy conversion in porphyrinic compounds
- Publication Year :
- 2019
- Publisher :
- American Chemical Society, 2019.
-
Abstract
- 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.<br />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.
- Subjects :
- Materials science
02 engineering and technology
010402 general chemistry
Photochemistry
01 natural sciences
Metal
symbols.namesake
chemistry.chemical_compound
Physical and Theoretical Chemistry
Surface plasmon resonance
GeneralLiterature_REFERENCE(e.g.,dictionaries,encyclopedias,glossaries)
business.industry
Chlorophyllin
Photothermal therapy
021001 nanoscience & nanotechnology
0104 chemical sciences
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
540: Chemie
ComputingMilieux_GENERAL
General Energy
chemistry
visual_art
ComputingMethodologies_DOCUMENTANDTEXTPROCESSING
symbols
visual_art.visual_art_medium
Phthalocyanine
Charge carrier
0210 nano-technology
Raman spectroscopy
business
Thermal energy
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....5ac04a3a15554e7e2db97a579543c375