Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 15, Issue 23, Pages 5831-5844Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.200802329
Keywords
hybrid materials; nanoparticles; oligopeptides; pH; silver
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Funding
- Alexander von Humboldt Foundation
- Max Planck Society
- Federal Ministry of Education and Research
- Swiss National Science Foundation
- University of Potsdam
- Federal Institute for Materials Research and Testing
- Max-Planck-Institute of Colloids and Interfaces
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Simple tripeptides are scaffolds for the synthesis and further assembly of peptide/silver nanoparticle composites. Herein, we further explore peptide-con trolled silver nanoparticle assembly processes. Silver nanoparticles with a pH-responsive peptide coating have been synthesized by using a one-step precipitation/coating route. The nature of the peptide/silver interaction and the effect of the peptide oil the formation of the silver particles have been studied via UV/Vis, X-ray photoelectron, and surface-enhanced Raman spectroscopies as well as through electron microscopy, small angle X-ray scattering and powder Xray diffraction with Rietveld refinement. The particles reversibly form aggregates of different sizes in aqueous solution. The state of aggregation call be controlled by the solution pH value. At low pH values, individual particles are present. At neutral pH values, small clusters form and at high pH values, large precipitates are observed.
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