Van der Waals-induced chromatic shifts in hydrogen-bonded two-dimensional porphyrin arrays on boron nitride
Publication Date
August 19, 2015
Creators
Description
The fluorescence of a two-dimensional supramolecular network of 5,10,15,20-tetrakis(4-carboxylphenyl)porphyrin (TCPP) adsorbed on hexagonal boron nitride (hBN) is redshifted due to, primarily, adsorbate-substrate van der Waals interactions. TCPP is deposited from solution on hBN and forms facetted islands with typical dimensions of 100 nm and either square or hexagonal symmetry. The molecular arrangement is stabilised by in-plane hydrogen bonding as determined by a combination of molecular-resolution atomic force microscopy performed under ambient conditions, and density functional theory; a similar structure is observed on MoS2 and graphite. The fluorescence spectra of sub-monolayers of TCPP on hBN are redshifted by ~30 nm due to the distortion of the molecule arising from van der Waals interactions, in agreement with time-dependent density functional theory calculations. Fluorescence intensity variations are observed due to coherent partial reflections at the hBN interface implying that such hybrid structures have potential in photonic applications.
Collection dates:
01/05/2014-31/10/2014
External URI
Subjects
Subjects (JACS)
Subjects (LC)
Divisions
Faculties, Schools and Departments::University of Nottingham, UK Campus::Faculty of Science::School of Physics and Astronomy
Data type
Atomic force microscopy images, fluorescence spectra
Funders
The Royal Society
The University of Nottingham
Grant Number
EP/K01773X/1
Data collection method
Atomic force micrscopes: Asylum Cypher and Asylum MFP3D. Fluorescence spectra: Horiba LABRAM confocal microscope
Resource languages
English
Publisher
University of Nottingham
Date Issued
October 1, 2015
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