RT Journal Article
T1 Optical and Chiroptical Stimuli-Responsive Chiral AgNPs@H-Leu-Poly(phenylacetylene) Nanocomposites in Water
A1 Fernández Míguez, Manuel
A1 Núñez Martínez, Manuel
A1 Suárez-Picado, Esteban
A1 Quiñoá Cabana, Emilio
A1 Freire Iribarne, Félix Manuel
K1 Chirality
K1 Silver Nanoparticles
K1 Stimuli Responsiveness
K1 Poly(phenylacetylene)s
K1 Nanocomposites
AB Dynamic macroscopically chiral nanocomposites are prepared by combining silver nanoparticles (AgNPs) and dynamic helical poly(phenylacetylene)s (PPAs) bearing pendants functionalized with amino groups. These amino groups provide the nanocomposite with the ability to disperse in water along with high stability due to the interaction between the ammonium group and the AgNP. Moreover, the equilibrium between NH3+/NH2 produces a “blinking” contact between the PPA and the AgNPs, which allows total control of the dynamic helical behavior of the polymer. The use of acidic or neutral pH allows controlling the morphology of the nanocomposite, which consists of a nanosphere that has trapped inside it a single AgNP (pH = 2) or several AgNPs (pH = 7) with ca. 30 nm of diameter. These nanocomposites combine the optical and chiroptical stimuli-responsive properties of both components, AgNPs and PPAs. Thus, the controlled aggregation of the nanocomposite produced variations in the LSPR band of the AgNPs in a reversible manner. In turn, given that the chiral coating is selective to Ba2+, the presence of this metal ion caused a helical inversion of the chiral coating of the nanocomposite detected by electronic circular dichroism. Moreover, it is possible to distinguish between three metal ions in different oxidation states, such as Ce4+, Fe3+, and Hg2+, which produce different responses of the nanocomposite when oxidizing the AgNP to Ag+.
PB American Chemical Society
YR 2024
FD 2024-10-09
LK https://hdl.handle.net/10347/38159
UL https://hdl.handle.net/10347/38159
LA eng
NO Fernández-Míguez, M., Núñez-Martínez, M., Suárez-Picado, E., Quiñoá, E., & Freire, F.(2024). Optical and Chiroptical Stimuli-Responsive Chiral AgNPs@H-Leu-Poly(phenylacetylene) Nanocomposites in Water. “ACS Nano”, 18(42), 28822-2883. https://doi.org/10.1021/acsnano.4c08622
NO The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acsnano.4c08622.
NO Xunta de Galicia (ED431C 2022/21)
NO Centro Singular de Investigación de Galicia acreditación (2023−2027, ED431G 2023/ 03)
NO European Regional Development Fund (ERDF)
DS Minerva
RD 23 abr 2026