Ligand Shell Structure in Lead Sulfide–Oleic Acid Colloidal Quantum Dots Revealed by Small-Angle Scattering
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 measur...
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Published in | The journal of physical chemistry letters Vol. 10; no. 16; pp. 4713 - 4719 |
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Main Authors | , , , , , , , , , , , , , , , |
Format | Journal Article |
Language | English |
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United States
American Chemical Society
15.08.2019
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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. |
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AbstractList | 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. 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. |
Author | Penfold, Nicholas J. W Dowland, Simon Greenham, Neil C Gray, Victor Friend, Richard H Xiao, James Rao, Akshay Kilbride, Rachel C Ryan, Anthony J Jones, Richard A. L Washington, Adam L Weir, Michael P Zhang, Zhilong Toolan, Daniel T. W King, Stephen M Winkel, Jurjen |
AuthorAffiliation | Department of Chemistry Department of Physics and Astronomy The University of Sheffield STFC Rutherford Appleton Laboratory Cavendish Laboratory |
AuthorAffiliation_xml | – name: STFC Rutherford Appleton Laboratory – name: The University of Sheffield – name: Department of Chemistry – name: Department of Physics and Astronomy – name: Cavendish Laboratory |
Author_xml | – sequence: 1 givenname: Michael P orcidid: 0000-0001-8283-1040 surname: Weir fullname: Weir, Michael P email: weir.mp@gmail.com organization: Department of Physics and Astronomy – sequence: 2 givenname: Daniel T. W orcidid: 0000-0003-3228-854X surname: Toolan fullname: Toolan, Daniel T. W organization: The University of Sheffield – sequence: 3 givenname: Rachel C surname: Kilbride fullname: Kilbride, Rachel C organization: Department of Physics and Astronomy – sequence: 4 givenname: Nicholas J. W orcidid: 0000-0002-6505-3782 surname: Penfold fullname: Penfold, Nicholas J. W organization: The University of Sheffield – sequence: 5 givenname: Adam L surname: Washington fullname: Washington, Adam L organization: STFC Rutherford Appleton Laboratory – sequence: 6 givenname: Stephen M surname: King fullname: King, Stephen M organization: STFC Rutherford Appleton Laboratory – sequence: 7 givenname: James surname: Xiao fullname: Xiao, James organization: Cavendish Laboratory – sequence: 8 givenname: Zhilong orcidid: 0000-0001-9903-4945 surname: Zhang fullname: Zhang, Zhilong organization: Cavendish Laboratory – sequence: 9 givenname: Victor orcidid: 0000-0001-6583-8654 surname: Gray fullname: Gray, Victor organization: Cavendish Laboratory – sequence: 10 givenname: Simon orcidid: 0000-0002-3613-5666 surname: Dowland fullname: Dowland, Simon organization: Cavendish Laboratory – sequence: 11 givenname: Jurjen surname: Winkel fullname: Winkel, Jurjen organization: Cavendish Laboratory – sequence: 12 givenname: Neil C orcidid: 0000-0002-2155-2432 surname: Greenham fullname: Greenham, Neil C organization: Cavendish Laboratory – sequence: 13 givenname: Richard H orcidid: 0000-0001-6565-6308 surname: Friend fullname: Friend, Richard H organization: Cavendish Laboratory – sequence: 14 givenname: Akshay orcidid: 0000-0003-4261-0766 surname: Rao fullname: Rao, Akshay organization: Cavendish Laboratory – sequence: 15 givenname: Anthony J surname: Ryan fullname: Ryan, Anthony J organization: The University of Sheffield – sequence: 16 givenname: Richard A. L surname: Jones fullname: Jones, Richard A. L organization: Department of Physics and Astronomy |
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Snippet | Nanocrystal quantum dots are generally coated with an organic ligand layer. These layers are a necessary consequence of their chemical synthesis, and in... Nanocrystal quantum dots are generally coated with an organic ligand layer. These layers are a necessary consequence of their chemical synthesis, and in... |
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SubjectTerms | Chemistry with specialization in Materials Chemistry Chemistry with specialization in Physical Chemistry Fysikalisk kemi Kemi med inriktning mot fysikalisk kemi Kemi med inriktning mot materialkemi Letter Physical Chemistry |
Title | Ligand Shell Structure in Lead Sulfide–Oleic Acid Colloidal Quantum Dots Revealed by Small-Angle Scattering |
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