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Title: In situ spectroscopic characterization of a solution-phase X-type ligand exchange at colloidal lead sulphide quantum dot surfaces

Journal Article · · ChemComm
DOI:https://doi.org/10.1039/C6CC08114B· OSTI ID:1334589
 [1];  [2];  [2];  [1];  [2]
  1. National Renewable Energy Lab. (NREL), Golden, CO (United States); Univ. of Colorado, Boulder, CO (United States)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States)

Here, we employed quantitative NMR spectroscopy and spectrophotometric absorbance titration to study a quantum dot X-type ligand exchange reaction. We find that the exchange is highly cooperative, where at low extents of exchange the change in free energy of the reaction, ΔGXC, is ~11 kJ mol–1 while at higher extents of exchange ΔGXC saturates to ~–4 kJ mol–1. A modified Fowler binding isotherm is developed to describe the reaction.

Research Organization:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC36-08GO28308
OSTI ID:
1334589
Report Number(s):
NREL/JA-5900-67253; CHCOFS
Journal Information:
ChemComm, Vol. 52, Issue 96; ISSN 1359-7345
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 29 works
Citation information provided by
Web of Science

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PbSe Quantum Dot Field-Effect Transistors with Air-Stable Electron Mobilities above 7 cm 2 V –1 s –1 journal March 2013
A Solution NMR Toolbox for Characterizing the Surface Chemistry of Colloidal Nanocrystals journal February 2013
Energy Level Modification in Lead Sulfide Quantum Dot Thin Films through Ligand Exchange journal May 2014
“Darker-than-Black” PbS Quantum Dots: Enhancing Optical Absorption of Colloidal Semiconductor Nanocrystals via Short Conjugated Ligands journal January 2015
Colloidal Arenethiolate-Capped PbS Quantum Dots: Optoelectronic Properties, Self-Assembly, and Application in Solution-Cast Photovoltaics journal June 2013
Near-Unity Quantum Yields from Chloride Treated CdTe Colloidal Quantum Dots journal October 2014
The coordination chemistry of nanocrystal surfaces journal February 2015

Cited By (5)

Nahinfrarotaktive Bleichalkogenid‐Quantenpunkte: Herstellung, postsynthetischer Ligandenaustausch und Anwendungen in Solarzellen journal February 2019
Tuning colloidal quantum dot band edge positions through solution-phase surface chemistry modification journal May 2017
The dynamic surface chemistry of colloidal metal chalcogenide quantum dots journal January 2019
Enhancing light absorption by colloidal metal chalcogenide quantum dots via chalcogenol(ate) surface ligands journal January 2019
Enhanced photoredox activity of CsPbBr 3 nanocrystals by quantitative colloidal ligand exchange journal November 2019