Coupling effects in QD dimers at sub-nanometer interparticle distance

Carlo Nazareno Dibenedetto, Elisabetta Fanizza, Rosaria Brescia, Yuval Kolodny, Sergei Remennik, Annamaria Panniello, Nicoletta Depalo, Shira Yochelis, Roberto Comparelli, Angela Agostiano, Maria Lucia Curri, Yossi Paltiel, Marinella Striccoli*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


Currently, intensive research efforts focus on the fabrication of meso-structures of assembled colloidal quantum dots (QDs) with original optical and electronic properties. Such collective features originate from the QDs coupling, depending on the number of connected units and their distance. However, the development of general methodologies to assemble colloidal QD with precise stoichiometry and particle-particle spacing remains a key challenge. Here, we demonstrate that dimers of CdSe QDs, stable in solution, can be obtained by engineering QD surface chemistry, reducing the surface steric hindrance and favoring the link between two QDs. The connection is made by using alkyl dithiols as bifunctional linkers and different chain lengths are used to tune the interparticle distance from few nm down to 0.5 nm. The spectroscopic investigation highlights that coupling phenomena between the QDs in dimers are strongly dependent on the interparticle distance and QD size, ultimately affecting the exciton dissociation efficiency. [Figure not available: see fulltext.].

Original languageAmerican English
Pages (from-to)1071-1080
Number of pages10
JournalNano Research
Issue number4
StatePublished - 1 Apr 2020

Bibliographical note

Publisher Copyright:
© 2020, The Author(s).


  • coupling
  • dimers
  • dithiols
  • quantum dots
  • surface chemistry


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