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Optical actuation of inorganic/organic interfaces: comparing peptide-azobenzene ligand reconfiguration on gold and silver nanoparticles

Palafox-Hernandez, J Pablo, Lim, Chang-Keun, Tang, Zhengua, Drew, Kurt L M, Hughes, Zak E, Li, Yue, Swihart, Mark T, Prasad, Paras N, Knecht, Marc R and Walsh, Tiffany R 2015, Optical actuation of inorganic/organic interfaces: comparing peptide-azobenzene ligand reconfiguration on gold and silver nanoparticles, ACS Applied materials and interfaces, vol. 8, no. 1, pp. 1050-1060, doi: 10.1021/acsami.5b11989.

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Title Optical actuation of inorganic/organic interfaces: comparing peptide-azobenzene ligand reconfiguration on gold and silver nanoparticles
Author(s) Palafox-Hernandez, J Pablo
Lim, Chang-Keun
Tang, Zhengua
Drew, Kurt L M
Hughes, Zak EORCID iD for Hughes, Zak E orcid.org/0000-0003-2166-9822
Li, Yue
Swihart, Mark T
Prasad, Paras N
Knecht, Marc R
Walsh, Tiffany RORCID iD for Walsh, Tiffany R orcid.org/0000-0002-0233-9484
Journal name ACS Applied materials and interfaces
Volume number 8
Issue number 1
Start page 1050
End page 1060
Total pages 11
Publisher American Chemical Society
Place of publication Washington D.C., Wash.
Publication date 2015-12-18
ISSN 1944-8244
Keyword(s) bionanocombinatorics
peptides
conformational switching
nanoparticles
azobenzene
Summary 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 attached at the peptide N- or C-terminus, its isomerization state, and the nanoparticle composition. Our integrated experimental and computational investigation shows that the number of ligand anchor sites strongly influences the nanoparticle size. As predicted by our molecular simulations, weaker contact between the hybrid biomolecules and the Ag surface, with fewer anchor residues compared with Au, gives rise to differences in switching kinetics on Ag versus Au. Our findings provide a pathway toward achieving new remotely actuatable nanomaterials for multiple applications from a single system, which remains difficult to achieve using conventional approaches.
Language eng
DOI 10.1021/acsami.5b11989
Field of Research 030302 Nanochemistry and Supramolecular Chemistry
030303 Optical Properties of Materials
030406 Proteins and Peptides
030603 Colloid and Surface Chemistry
030704 Statistical Mechanics in Chemistry
Socio Economic Objective 970103 Expanding Knowledge in the Chemical Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, American Chemical Society
Persistent URL http://hdl.handle.net/10536/DRO/DU:30083228

Document type: Journal Article
Collection: Institute for Frontier Materials
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