Eventos
O luns 12 de xaneiro, o Prof. Hedi Mattoussi (Department of Chemistry and Biochemistry, Florida State University) ofrecerá o seminario “Structural and photo-physical stabilization of perovskite quantum dots using polyzwitterion/polysalt ligands" dentro do ciclo CINBIO Seminar Programme.
Será ás 11:00 horas na Sala de seminarios de Torre CACTI.
ABSTRACT:
Colloidal nanocrystals made of all-inorganic lead halide cores (perovskite quantum dots, PQDs), exhibit quantum confinement of charge carriers, yielding size-dependent photophysical properties. PQDs are highly sought for applications that include light-emitting and photovoltaic devices. However, tangible progress in probing their fundamental properties and/or their integration in devices, has been hampered by issues of colloidal and photophysical instability.
To address those problems, we have introduced a promising surface coating strategy relying on poly-zwitterionic and polysalt polymers, where high affinity binding onto the QDs is driven by multi-coordinating electrostatic interactions with the ion-rich surfaces of CsPbBr3 PQDs. The polymer ligands were synthesized by grafting a stoichiometric mixture of amine-modified sulfobetaine/ammonium/imidazolium anchors for coordination onto PQD surfaces and solubilizing motifs on a poly(isobutylene-alt-maleic anhydride), PIMA, via nucleophilic addition reaction. We find that these coatings impart enhanced colloidal stability to spherical as well as anisotropic nanocrystals over a broad range of solvent conditions. Additionally, this stabilization strategy preserves the photophysical and structural characteristics of the nanocrystals in a variety of polar solvents and over extended periods of time. They also improve the structural and morphological homogeneity of these nanocrystals by repairing surface defects.
BIO:
Hedi Mattoussi is a Distinguished Research Professor at Florida State University, Tallahassee. Prior to joining FSU in 2009, he spent 12 years as a Research Scientist at the US Naval Research Laboratory (Washington). After graduating with a Bachelor in Physics from the University of Tunis El Manar (Tunisia) in 1982, he earned a Ph.D. in Condensed Matter Physics in 1987 and a Habilitation to direct Research in Materials Physics in 1994, both from Sorbonne University, University of Pierre & Marie Curie Campus. He presently focuses on the development of inorganic nanocolloids and transition metal clusters and interfacing them with biological systems. Professor Mattoussi is a fellow of the American Chemical Society, ACS (class of 2011), the American Physical society, APS (class of 2013) the Royal Society of Chemistry, RSC (class of 2014), and the Materials Research Society, MRS (class of 2020). He was awarded the 2022 Kuwait Prize (sponsored by the Kuwait Foundation for the Advancement of Sciences, KFAS) and the 2024 American Chemical Society (ACS) Award in Surface Chemistry.
Homepage: http://www.chem.fsu.edu/~mattoussi/
