Enhancement of exciton transport in porphyrin aggregate nanostructures by controlling the hierarchical self-assembly

Nanoscale
Taehee KimDongho Kim

Abstract

Exciton transport in meso-tetra(4-sulfonatophenyl) porphyrin (TPPS) J-aggregates was directly imaged using the emission profile analysis method with confocal fluorescence microscopy. By controlling the structural hierarchy of TPPS aggregates, we could comparatively study the exciton transport properties in single nanotubes and bundled structures. Using the one-dimensional diffusion model, the exciton diffusion coefficients of TPPS nanotubes and bundles were estimated as 95 and 393 nm2 ps-1, respectively, showing a dramatic enhancement of exciton transport in bundled structures. To reveal the underlying mechanism of enhanced exciton transport in bundle compared to that in single strands, the spatially resolved measurements of exciton transport images were correlated with the spectral information at each local sites. We have confirmed that nanotube and its bundled form possess different energetic landscapes and exciton migration dynamics. Agglomeration into bundles led to an increase in system-environment coupling and denser distribution of energy states, facilitating longer migration length and accelerated transport. Detailed analysis in this study provides important insights into the structure-dependent exciton transport proper...Continue Reading

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Citations

Apr 25, 2019·Faraday Discussions·Shaunak M ShaikhAmanda J Morris
Sep 25, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Esteban Sánchez-MuñozRocío Aguilar-Sánchez
Oct 12, 2019·Nature Communications·Björn KrieteMaxim S Pshenichnikov
Apr 14, 2020·Journal of the American Chemical Society·Bernd WittmannRichard Hildner
Jan 9, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Adam WeissmanAdi Salomon
Aug 29, 2019·ACS Omega·Mariachiara TrapaniRobert F Pasternack
Oct 6, 2021·Materials Horizons·Jiayu ZengXuemei Wang
Nov 4, 2021·Nanoscale Horizons : the Home for Rapid Reports of Exceptional Significance in Nanoscience and Nanotechnolgy·Bernd WittmannRichard Hildner

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Methods Mentioned

BETA
fluorescence microscopy
scanning
atomic force microscopy
transmission electron microscopy
AFM
Scanning electron microscopy
fluorescence scan

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