Influence of Engineered Peptides Cadmium Sulfide Nanocrystals


  • The authors acknowledge Dr. Thomas Headley of the Materials Characterization department at Sandia National Laboratories for assistance with transmission electron microscopy. The authors also acknowledge Dr. Thomas Sounart at Sandia National Laboratories for insightful comments and discussion. Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy's National Nuclear Security Administration under Contract DE-AC04-94AL85000.


Cadmium sulfide (CdS) nanocrystals continue to generate scientific and technological interest, owing to their valuable optical, electronic, and chemical properties. Aqueous nanocrystal syntheses rely on functional capping agents to control nanocrystal form and function. We present a series of linear and dendritic engineered peptides, rich in cysteines and aspartic acids, as CdS capping agents. The chemical composition and peptide geometry were found to significantly influence CdS nanocrystal size, optical properties, and aggregation behavior.