Quantitative Imaging of Organic Ligand Density on
Anisotropic Inorganic Nanocrystals
Version 2 2019-09-01, 12:04
Version 1 2019-09-01, 12:03
Posted on 2019-09-01 - 12:04
A longstanding challenge
in nanoparticle characterization is to
understand anisotropic distributions of organic ligands at the surface
of inorganic nanoparticles. Here, we show that using electron energy
loss spectroscopy in an aberration-corrected scanning transmission
electron microscope we can directly visualize and quantify ligand
distributions on gold nanorods (AuNRs). These experiments analyze
dozens of particles on graphene substrates, providing insight into
how ligand binding densities vary within and between individual nanoparticles.
We demonstrate that the distribution of cetyltrimethylammonium bromide
(CTAB) on AuNRs is anisotropic, with a 30% decrease in ligand density
at the poles of the nanoparticles. In contrast, the distribution of
(16-mercaptohexadecyl)trimethylammonium bromide (MTAB) is more uniform.
These results are consistent with literature reported higher reactivity
at the ends of CTAB-coated AuNRs. Our results demonstrate the impact
of electron spectroscopy to probe molecular distributions at soft–hard
interfaces and how they produce spatially heterogeneous properties
in colloidal nanoparticles.
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Janicek, Blanka
E.; Hinman, Joshua G.; Hinman, Jordan J.; Bae, Sang hyun; Wu, Meng; Turner, Jacob; et al. (2019). Quantitative Imaging of Organic Ligand Density on
Anisotropic Inorganic Nanocrystals. ACS Publications. Collection. https://doi.org/10.1021/acs.nanolett.9b02434
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AUTHORS (12)
BJ
Blanka
E. Janicek
JH
Joshua G. Hinman
JH
Jordan J. Hinman
SB
Sang hyun Bae
MW
Meng Wu
JT
Jacob Turner
HC
Huei-Huei Chang
EP
Eugene Park
RL
Rachel Lawless
KS
Kenneth S. Suslick
CM
Catherine J. Murphy
PH
Pinshane Y. Huang
KEYWORDS
graphene substratesgold nanorodsanisotropic distributionsligand distributionsligand binding densitiesMTABQuantitative Imagingnanoparticle characterizationelectron spectroscopyligand densityelectron energy loss spectroscopyOrganic Ligand DensityCTAB-coated AuNRscetyltrimethylammonium bromideaberration-corrected scanning transmission electron microscope