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Nano Research

Article Title

Coupling effects in QD dimers at sub-nanometer interparticle distance

Authors

Carlo Nazareno Dibenedetto, CNR-Istituto per i Processi Chimico-Fisici SS Bari, Via Orabona 4, 70125 - Bari, Italy Università degli Studi di Bari Aldo Moro, Dipartimento di Chimica, Via Orabona 4, 70125-Bari, Italy
Elisabetta Fanizza, CNR-Istituto per i Processi Chimico-Fisici SS Bari, Via Orabona 4, 70125 - Bari, Italy Università degli Studi di Bari Aldo Moro, Dipartimento di Chimica, Via Orabona 4, 70125-Bari, Italy
Rosaria Brescia, Electron Microscopy Facility, Istituto Italiano di Tecnologia, via Morego 30, 16163 Genova, Italy
Yuval Kolodny, Department of Applied Physics and the Center for Nanoscience and Nanotechnology, Hebrew University of Jerusalem, Jerusalem 9190401, Israel
Sergei Remennik, Department of Applied Physics and the Center for Nanoscience and Nanotechnology, Hebrew University of Jerusalem, Jerusalem 9190401, Israel
Annamaria Panniello, CNR-Istituto per i Processi Chimico-Fisici SS Bari, Via Orabona 4, 70125 - Bari, Italy
Nicoletta Depalo, CNR-Istituto per i Processi Chimico-Fisici SS Bari, Via Orabona 4, 70125 - Bari, Italy
Shira Yochelis, Department of Applied Physics and the Center for Nanoscience and Nanotechnology, Hebrew University of Jerusalem, Jerusalem 9190401, Israel
Roberto Comparelli, CNR-Istituto per i Processi Chimico-Fisici SS Bari, Via Orabona 4, 70125 - Bari, Italy
Angela Agostiano, CNR-Istituto per i Processi Chimico-Fisici SS Bari, Via Orabona 4, 70125 - Bari, Italy Università degli Studi di Bari Aldo Moro, Dipartimento di Chimica, Via Orabona 4, 70125-Bari, Italy
Maria Lucia Curri, CNR-Istituto per i Processi Chimico-Fisici SS Bari, Via Orabona 4, 70125 - Bari, Italy Università degli Studi di Bari Aldo Moro, Dipartimento di Chimica, Via Orabona 4, 70125-Bari, Italy
Yossi Paltiel, Department of Applied Physics and the Center for Nanoscience and Nanotechnology, Hebrew University of Jerusalem, Jerusalem 9190401, Israel
Marinella Striccoli, CNR-Istituto per i Processi Chimico-Fisici SS Bari, Via Orabona 4, 70125 - Bari, Italy

Keywords

quantum dots, dimers, surface chemistry, dithiols, coupling

Abstract

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.

Graphical Abstract

Publisher

Tsinghua University Press

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