Ligand Shell Structure in Lead Sulfide-Oleic Acid Colloidal Quantum Dots Revealed by Small-Angle Scattering

The Journal of Physical Chemistry Letters
Michael P WeirRichard A L Jones

Abstract

Nanocrystal quantum dots are generally coated with an organic ligand layer. These layers are a necessary consequence of their chemical synthesis, and in addition they play a key role in controlling the optical and electronic properties of the system. Here we describe a method for quantitative measurement of the ligand layer in 3 nm diameter lead sulfide-oleic acid quantum dots. Complementary small-angle X-ray and neutron scattering (SAXS and SANS) studies give a complete and quantitative picture of the nanoparticle structure. We find greater-than-monolayer coverage of oleic acid and a significant proportion of ligand remaining in solution, and we demonstrate reversible thermal cycling of the oleic acid coverage. We outline the effectiveness of simple purification procedures with applications in preparing dots for efficient ligand exchange. Our method is transferrable to a wide range of colloidal nanocrystals and ligand chemistries, providing the quantitative means to enable the rational design of ligand-exchange procedures.

References

Jun 20, 2013·Nano Letters·William J BaumgardnerTobias Hanrath
Jul 15, 2015·Nano Letters·Zhiyuan HuangChristopher J Bardeen
Jan 23, 2016·Science·Cédric MonginFelix N Castellano
Aug 9, 2016·Chemical Reviews·Rachel D HarrisEmily A Weiss
Mar 16, 2017·Journal of the American Chemical Society·Zhengyi ZhangEmily A Weiss
Jan 24, 2018·Nature Chemistry·Cédric MonginFelix N Castellano
Mar 7, 2018·The Journal of Physical Chemistry Letters·Nathaniel J L K DavisAkshay Rao

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Citations

Jul 2, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Carlo Nazareno DibenedettoElisabetta Fanizza
Jan 15, 2021·Journal of the American Chemical Society·Carolyn L HartleyJillian L Dempsey

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Methods Mentioned

BETA
X-ray
small-angle
NMR
SANS
neutron scattering
Neutron

Software Mentioned

IRENA
SANS
SANS2D
Igor Pro
SasView
Foxtrot
SAXS

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