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Projeto de investigação
Engineering optoelectronic INterfaces: a global action intersecting FUndamental conceptS and technology implementatION of self-organized organic materials
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Study of Perovskite Quantum Dots for Super-resolution Microscopy Applications
Publication . Meixeiro, Ana Carolina Espada Antunes e Natal; Laia, César; Pereira, Luís
Quantum Dots (QDs) are known for their remarkable optical properties, such as, high
photoluminescent quantum yields (PLQY), large absorption spectra, narrow emission
spectra, excellent photostability and the possibility to shift the fluorescence emission in a
wide spectrum of colours through QD synthesis conditions [1–4]. When compared with
conventional fluorophores, QDs show many advantages, like resistance to photobleaching,
enhanced photostability and brightness [5]. In this work Iodine Perovskite Quantum Dots
(CsP bI3) were used, since this type of QDs show great photophysical properties and nearinfrared
(NIR) emission. Nevertheless, their structural stability and shelf life needed
improvement, so a doping system based on cadmium was developed, and alterations
in the synthesis were studied to fulfil the needs without causing any kind of drawback.
An extensive optical, chemical and morphological characterisation was carried out to
fully understand the influence of the developed particle engineering. It was proven that
the doping system and synthesis modifications increase the stability of the nanocrystal,
without pitfalls. Finally, different Super Resolution Microscopy techniques were used
to investigate the performance of the PQDs, the possibility of using them as fluorescent
dyes and a possible resolution enhancement.
Photoresponsive Binding Dynamics in High-Affinity Cucurbit[8]uril-Dithienylethene Host-Guest Complexes
Publication . Colaço, Miriam; Máximo, Patrícia; Jorge Parola, A.; Basílio, Nuno; DQ - Departamento de Química; LAQV@REQUIMTE; Wiley
The use of external stimuli to control the binding kinetics in supramolecular systems is of critical importance for the development of advanced molecular machines and devices. In this work, a study focused on the kinetics of a water-soluble host-guest system based on cucurbit[8]uril and two dithienylethene (DTE) photoswitches is reported. It is shown that for the DTE guest comprising two anionic sulfonate side arms appended to pyridinium moieties, the formation/dissociation of the pseudorotaxane structures is slowed down by more than 100000-fold with respect to its bipyridinium analogue. The decrease in ingression rate leads to the emergence of a competitive metastable product with the open DTE isomer that has an important influence in the overall binding kinetics. Moreover, the host-guest dissociation kinetics is demonstrated to be approximately 100-fold slower for the closed DTE isomer (t1/2=107 h vs. t1/2=1.2 h for the open isomer) allowing control over the dissociation rate with light.
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Entidade financiadora
European Commission
Programa de financiamento
H2020
Número da atribuição
734834