How Cracks Affect the Optical Properties of Silver Supracrystals

  • Author: Liam Critchley
  • Published: 11 January 2019
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA
  • Source / Publisher: ACS Nano/ACS Publications
  • Associated Societies: American Chemical Society (ACS), USA
thumbnail image: How Cracks Affect the Optical Properties of Silver Supracrystals

Supracrystals are self-assembled materials that possess 3D superlattices. They are known to have a range of physical properties which are highly specific and often show unexpected behavior. Many properties of thick supracrystals (over 1000 layers) are known, and the optical properties are known to be governed by dipolar interactions within the lattice. But how the optical properties of thinner supracrystals are affected in certain circumstances is lesser known.

Marie-Paule Pileni, CEA/IRAMIS, France, and Claire Deeb, University of Paris-Sud, France, and colleagues at Sorbonne University, France, have investigated how cracks in silver supracrystal films, of 27 to 180 layers in thickness, affect the optical properties of the supracrystal. The researchers first fabricated oleylamine coated silver nanocrystals and synthesized them into supracrystals using wet chemical and deposition techniques.

The researchers found that the optical transmission of wavelengths in the 300–800 nm range was reduced as as the supracrystal film thickness increased. The researchers explain this unexpected behavior by the presence of wetting layers at the bottom of the cracks produced by a shrinking process during the formation of supracrystal films. This was confirmed by both theoretical and experimental data. The crack widths were also found to increase when the film thickness was increased, and this subsequently led to more complex wetting layers below the cracks.


Article Views: 953

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

Bookmark and Share

If you would like to reuse any content, in print or online, from, please contact us first for permission. more

CONNECT: on Facebook on Twitter on YouTube on LinkedIn Sign up for our free newsletter

Magazine of Chemistry Europe (16 European Chemical Societies)published by Wiley-VCH