Seznam abstraktů 2024: PLENÁRNÍ SEKCE

Halide perovskite solar cells have revolutionized the photovoltaic field in the last decade, due to their outstanding optoelectronic properties, causing that currently the research with these materials widespread to different optoelectronic and photocatalytic fields. The great success of halide perovskites boosted also the interest on perovskite nanoparticles (PNPs). PNPs are also generating a huge interest as relative easy preparation methods yield to photoluminescence quantum yield (PLQY) close to unity. Here we show the application of PNPs on light emitting diodes (LEDs), providing narrow electroluminescence (EL) peak, purer colors, and versatility to tune the emitting color. In this talk, I discuss different strategies to increase the performance, considering both the external quantum efficiency (EQE) and stability), but also the reproducibility. After an intensive work in perovskite LEDs field, it has been a huge improvement in the performance of these devices, however, the two main drawbacks of this system, the use of hazardous Pb and the long term stability, still to be open questions that have not been fully addressed.
In addition, in this talk we will show the application of inorganic perovskite NP in the photocatalytic and photoelectrochemical degradation of Organic compounds, highlighting the potentiality to drive both oxidation and reduction reactions. However, their use in most of the practical applications is limited due to the instability of the perovskite nanocrystals in polar environments. We will also discuss about the preparation of non-encapsulated CsPbX3 nanocrystals dispersed in fully alcohol environments, with outstanding stability through surface defect passivation strategy.

Engineered nanomaterials interface and interact with biological systems and this could be harnessed for biomedical applications such as drug delivery or imaging. On the other hand, nanomaterials may also cause unexpected or unwanted effects on human health. The present lecture will provide an overview of studies on the potential hazards of engineered nanomaterials with emphasis on the effects on the immune system. We will focus, in particular, on recent work on two-dimensional (2D) materials including graphene-based materials, transition metal dichalcogenides, and transition metal carbides and nitrides (MXenes). We will discuss the activation of the inflammasome, a multiprotein complex that serves as a key sentinel of the immune system. We will also address the biodegradation and/or biotransformation of 2D materials in living systems, and related studies on carbon nanotubes will be highlighted. Overall, a better understanding of the biological interactions of 2D materials and other nanomaterials will aid in the prediction of potential toxicities and may enable the prevention of adverse effects of nanomaterials on human health through the promotion of safe-by-design approaches.
Further reading: Fadeel B, Keller AA. Nanosafety: a perspective on nano-bio interactions. Small. 2024 Apr 10. doi: 10.1002/smll.202310540. [Epub ahead of print]; Fadeel B, Kostarelos K. Grouping all carbon nanotubes into a single substance category is scientifically unjustified. Nat Nanotechnol. 2020;15(3):164; Peng G, Fadeel B. Understanding the bidirectional interactions between two-dimensional materials, microorganisms, and the immune system. Adv Drug Deliv Rev. 2022;188:114422.