Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 116, Issue 41, Pages 21647-21656Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp306063p
Keywords
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Funding
- NSF (DMR) [1104614, 1215034]
- NIH (NCI) [R01 CA13852701]
- NIH Director's Pioneer Award [DP1 OD000798]
- startup funds from Georgia Institute of Technology
- China Scholarship Council
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1104614] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1215034] Funding Source: National Science Foundation
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This feature article introduces our recent work on understanding the roles played by citrate and poly(vinyl pyrrolidone) (PVP) as capping agents in seed-mediated syntheses of Ag nanocrystals with controlled shapes. We have demonstrated that citrate and PVP selectively bind to Ag(111) and Ag(100) surfaces, respectively, and thus favor the formation of Ag nanocrystals enclosed preferentially by {111} or {100} facets. In addition, we have quantified the coverage density of PVP adsorbed on the surface of Ag nanocubes. On the basis of the mechanistic understanding, a series of Ag nanocrystals with controlled shapes and sizes have been successfully synthesized by using different combinations of seeds and capping agents: single-crystal spherical/cubic seeds with citrate for cuboctahedrons and octahedrons or with PVP for cubes and bars and plate-like seeds with citrate for enlarged thin plates or with PVP for thickened plates.
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