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Chloride enables the growth of Ag nanocubes and nanowires by making PVP binding facet-selective

Journal Article · · Nanoscale
DOI:https://doi.org/10.1039/d2nr06762e· OSTI ID:1975741

Solution-phase synthesis of metal nanocrystals with multiple additives is a common strategy for control over nanocrystal shape, and thus control over their properties. However, few rules are available to predict the effect of multiple capping agents on metal nanocrystal shapes, making it hard to rationally design synthetic conditions. This work uses a combination of seed-mediated growth, single-crystal electrochemistry, and DFT calculations to determine the roles of PVP and Cl in the anisotropic growth of single-crystal and penta-twinned silver nanocrystals. Single-crystal seeds grow into truncated octahedra bounded by a mixture of {111} and {100} facets in the presence of 0.03–30 mM PVP, but when 3–6 μM Cl is added with PVP, the single-crystal seeds grow into cubes bounded by {100} facets. Electrochemical measurements on Ag(100) and Ag(111) single-crystal electrodes show PVP is a capping agent but it exhibits no selectivity for a particular facet. Addition of Cl to PVP further passivates Ag(100) but not Ag(111), leading to conditions that favor formation of nanocubes. DFT calculations indicate the preferential binding of Cl to Ag(100) causes preferential binding of PVP to Ag(100). Here, the combined results indicate the presence or absence of Cl modulates binding of PVP to (100) facets, leading to the formation of nanocubes with Cl, or truncated octahedra without it.

Research Organization:
Pennsylvania State University, University Park, PA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); National Science Foundation (NSF)
Grant/Contract Number:
FG02-07ER46414
OSTI ID:
1975741
Alternate ID(s):
OSTI ID: 1958072
Journal Information:
Nanoscale, Journal Name: Nanoscale Journal Issue: 11 Vol. 15; ISSN 2040-3364
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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