Journal
ACS NANO
Volume 8, Issue 7, Pages 6934-6944Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn501704k
Keywords
noble metal nanocrystals; defect generation; inorganic binding peptides; imidazole complexes; reduction kinetics; attachment growth; catalytic properties
Categories
Funding
- Office of Naval Research (ONR) [N00014-08-1-0985]
- Army Research Office (ARO) [54709-MS-PCS]
- Sloan Research Fellowship
- U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Science and Engineering [DE-SC0008055]
- National Science Foundation [DMR 0955071]
- Air Force Research Laboratory (AFRL)
- Air Force Research Laboratory (UES, Inc.)
- University of Akron
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0955071] Funding Source: National Science Foundation
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Controlling the morphology of nanocrystals (NCs) is of paramount importance for both fundamental studies and practical applications. The morphology of NCs is determined by the seed structure and the following facet growth. While means for directing facet formation in NC growth have been extensively studied, rational strategies for the production of NCs bearing structure defects in seeds have been much less explored. Here, we report mechanistic investigations of high density twin formation induced by specific peptides in platinum (Pt) NC growth, on the basis of which we derive principles that can serve as guidelines for the rational design of molecular surfactants to introduce high yield twinning in noble metal NC syntheses. Two synergistic factors are identified in producing twinned Pt NCs with the peptide: (1) the altered reduction kinetics and crystal growth pathway as a result of the complex formation between the histidine residue on the peptide and Pt ions, and (2) the preferential stabilization of {111) planes upon the formation of twinned seeds. We further apply the discovered principles to the design of small organic molecules bearing similar binding motifs as ligands/surfactants to create single and multiple twinned Pd and Rh NCs. Our studies demonstrate the rich information derived from biomimetic synthesis and the broad applicability of biomimetic principles to NC synthesis for diverse property tailoring.
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