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Related Experiment Video

Updated: Jun 4, 2026

Covalent Attachment of Single Molecules for AFM-based Force Spectroscopy
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Covalent Attachment of Single Molecules for AFM-based Force Spectroscopy

Published on: March 16, 2020

Stretched polyethylene films probed by single molecules.

Alexander C Wirtz1, Clemens Hofmann, Edgar J J Groenen

  • 1Molecular Nano-Optics and Spins (MoNOS), Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|February 16, 2011
PubMed
Summary

Stretched low-density polyethylene (LDPE) films doped with 2.3,8.9-dibenzanthanthrene (DBATT) show two distinct dopant molecule orientations. Increasing the stretch ratio enhances the proportion of oriented molecules, suggesting surface adsorption on crystal domains.

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Area of Science:

  • Materials Science
  • Polymer Physics
  • Spectroscopy

Background:

  • Low-density polyethylene (LDPE) is a widely used polymer with applications requiring specific mechanical and optical properties.
  • Doping polymers with organic molecules can modify their characteristics, but understanding dopant behavior within the polymer matrix is crucial.
  • Molecular orientation in stretched polymers influences macroscopic properties, yet detailed analysis of dopant molecule alignment remains challenging.

Purpose of the Study:

  • To investigate the orientation of 2.3,8.9-dibenzanthanthrene (DBATT) dopant molecules within stretched low-density polyethylene (LDPE) films.
  • To determine the relationship between the stretching ratio of LDPE films and the degree of dopant molecule alignment.
  • To elucidate the location and interaction mechanisms of dopant molecules within the polymer structure.

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Last Updated: Jun 4, 2026

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Main Methods:

  • Utilizing polarization-selective single-molecule spectroscopy at cryogenic temperatures (1.8 K).
  • Measuring the in-plane component of electronic transition-dipole moments of individual chromophores (DBATT molecules).
  • Analyzing the distributions of chromophore orientations to differentiate between molecular fractions.

Main Results:

  • Two distinct fractions of DBATT molecules were identified: those aligned with the stretching direction and randomly oriented molecules.
  • An increasing stretch ratio of LDPE films led to a higher proportion of oriented DBATT molecules.
  • The degree of orientation (width of the orientation distribution) remained constant regardless of the stretch ratio.

Conclusions:

  • Oriented DBATT molecules are predominantly located on the surfaces of polyethylene crystallites, not within amorphous regions.
  • The alignment of dopant molecules is attributed to the orientation of the crystallites on which they are adsorbed.
  • The interaction between guest molecules and crystal surfaces dictates the shape and width of the orientation distribution.