Open AccessMolecular-Level Control over Plasmonic Properties in Silver Nanoparticle/Self-Assembling Peptide Hybrids
Author(s) -
Yin Wang,
Xiaozhou Yang,
Tianyu Li,
Li Zhao,
David Leskauskas,
Guoliang Liu,
John Matson
Publication year - 2020
Publication title -
journal of the american chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 7.115
H-Index - 612
eISSN - 1520-5126
pISSN - 0002-7863
DOI - 10.1021/jacs.0c03672
Subject(s) - chemistry , plasmon , silver nanoparticle , raman spectroscopy , self assembling peptide , nanoparticle , peptide , nanotechnology , plasmonic nanoparticles , chirality (physics) , surface enhanced raman spectroscopy , spectroscopy , self assembly , amphiphile , raman scattering , optoelectronics , organic chemistry , copolymer , polymer , materials science , biochemistry , physics , chiral symmetry breaking , quantum mechanics , quark , nambu–jona lasinio model , optics
The plasmonic properties of silver nanoparticle (AgNP) arrays are directly controlled by AgNP size, shape, and spatial arrangement. Reported here is a strategy to prepare chiral AgNP arrays templated by two constitutionally isomeric aromatic peptide amphiphiles (APAs), K S C' EK S and C' EK S K S (K S = S -aroylthiooxime-modified lysine, C' = citrulline, and E = glutamic acid). In phosphate buffer, both APAs initially self-assembled into nanoribbons with a similar geometry. However, in the presence of silver ions and poly(sodium 4-styrenesulfonate) (PSSS), one of the nanoribbons ( K S C' EK S ) turned into nanohelices with a regular twisting pitch, while the other ( C' EK S K S ) remained as nanoribbons. Both were used as templates for synthesis of arrays of ∼8 nm AgNPs to understand how small changes in molecular structure affect the plasmonic properties of these chiral AgNP/APA hybrids. Both hybrids showed improved colloidal stability compared to pure AgNPs, and both showed enhanced sensitivity as surface-enhanced Raman spectroscopy (SERS) substrates for model analytes, with nanohelices showing better SERS performance compared to their nanoribbon counterparts and pure AgNPs.