skip to main content

SciTech ConnectSciTech Connect

Title: Strong π-π interaction of porphyrins on (6,5) carbon nanotubes with full surface coverage: Ab-initio calculations

The stability, electronic, and optical properties of (6,5) single-walled carbon nanotubes (CNTs) functionalized with free-base tetraphenylporphyrin (TPP) molecules through π-stacking interactions are studied by ab-initio calculations. The stability and optical response of the CNT-TPP compounds for increasing CNT-surface coverage are investigated. Our results show that four TPP molecules forming a ring around the CNT is the most stable configuration, showing strong binding energies of about 2.5 eV/TPP. However, this binding energy can increase even more after additional molecules assemble side by side along the CNT, favoring the formation of a full single layer of TPP, as experimentally suggested. The strong π-π attractive forces induce molecular distortions that move the TPP higher-occupied molecular orbital levels inside the CNT bandgap, changing the optical response of the TPP molecules stacked on the CNT.
Authors:
 [1]
  1. Departamento de Ciencias Físicas, Universidad Andres Bello, Avenida República 220, 837-0134 Santiago (Chile)
Publication Date:
OSTI Identifier:
22311099
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 2; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; BINDING ENERGY; CARBON NANOTUBES; COMPUTERIZED SIMULATION; CONFIGURATION; ELECTRICAL PROPERTIES; EV RANGE; INTERACTIONS; MOLECULAR ORBITAL METHOD; MOLECULES; OPTICAL PROPERTIES; PORPHYRINS; STABILITY; SURFACES