Optical Actuation of Inorganic/Organic Interfaces: Comparing Peptide-Azobenzene Ligand Reconfiguration on Gold and Silver Nanoparticles

Published on Jan 13, 2016in ACS Applied Materials & Interfaces8.456
· DOI :10.1021/acsami.5b11989
J. Pablo Palafox-Hernandez7
Estimated H-index: 7
(Deakin University),
Chang-Keun Lim17
Estimated H-index: 17
(UB: University at Buffalo)
+ 7 AuthorsTiffany R. Walsh31
Estimated H-index: 31
(Deakin University)
Photoresponsive molecules that incorporate peptides capable of material-specific recognition provide a basis for biomolecule-mediated control of the nucleation, growth, organization, and activation of hybrid inorganic/organic nanostructures. These hybrid molecules interact with the inorganic surface through multiple noncovalent interactions which allow reconfiguration in response to optical stimuli. Here, we quantify the binding of azobenzene-peptide conjugates that exhibit optically triggered cis-trans isomerization on Ag surfaces and compare to their behavior on Au. These results demonstrate differences in binding and switching behavior between the Au and Ag surfaces. These molecules can also produce and stabilize Au and Ag nanoparticles in aqueous media where the biointerface can be reproducibly and reversibly switched by optically triggered azobenzene isomerization. Comparisons of switching rates and reversibility on the nanoparticles reveal differences that depend upon whether the azobenzene is attac...
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