Single atoms and small clusters of atoms may accompany Au and Pd dendrimer-encapsulated nanoparticles

Strasser, Juliette W.; Crooks, Richard M.

doi:10.1039/d2sm00518b

Single atoms and small clusters of atoms may accompany Au and Pd dendrimer-encapsulated nanoparticles

Journal Article · Mon Jun 27 00:00:00 EDT 2022 · Soft Matter

DOI:https://doi.org/10.1039/d2sm00518b· OSTI ID:1978911

Strasser, Juliette W. ^[1]; ^[2]

Univ. of Texas, Austin, TX (United States); OSTI
Univ. of Texas, Austin, TX (United States)

Here we report the presence of small clusters of atoms (<1 nm) (SCs) and single atoms (SAs) in solutions containing 1–2 nm dendrimer-encapsulated nanoparticles (DENs). Au and Pd DENs were imaged using aberration-corrected scanning transmission electron microscopy (ac-STEM), and energy dispersive spectroscopy (EDS) was used to identify and quantify the SAs/SCs. Two main findings have emerged from this work. First, the presence or absence of SAs/SCs depends on both the terminal functional group of the dendrimer (–NH₂ or –OH) and the elemental composition of the DENs (Au or Pd). Second, dialysis can be used to remove the majority of SAs/SCs in cases where a high density of SAs/SCs are present. The foregoing conclusions provide insights into the mechanisms for Au and Pd DEN synthesis and stability. Ultimately, these results demonstrate the need for careful characterization of systems containing nanoparticles to ensure that SAs/SCs, which may be below the detection limit of most analytical methods, are taken into consideration (especially for catalysis experiments).

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Texas, Austin, TX (United States)

Sponsoring Organization:: Robert A. Welch Foundation; USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB)

Grant/Contract Number:: SC0010576

OSTI ID:: 1978911

Alternate ID(s):: OSTI ID: 1875943

Journal Information:: Soft Matter, Journal Name: Soft Matter Journal Issue: 27 Vol. 18; ISSN 1744-683X

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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