Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
Publication date: 22nd December 2022
Lead halide perovskite (LHP) nanocrystals (NCs) are promising nanomaterials for their use in fluorescent-based biosensing and bioimaging since their optical properties are more than appealing for this purpose considering the nanometer size of the crystals. However, these NCs are prone to degradation in polar media, where generally the mentioned applications take place.
This limitation leads to the development of coatings on the NC surface which offer stabilization and functionalization in aqueous media. Manipulation of the NC surface is particularly challenging, because most conventional methods result in the transformation of the NC to other non-fluorescent phases or its own degradation.
In this work, we summarize different strategies (A-C) to stabilize metal halide NCs inside silica or polymeric matrix. (A) An adaptation of the sol-gel process consisting in a post-synthetic chemical transformation of pre-synthesized NCs (CsPbBr3 or Cs4PbX6) in the presence of silica precursors, resulting in core-shell NPs (~ 30 nm), where SiO2 coating is achieved at a single particle level [1-2]. Post-functionalization and bioconjugation to antibodies confirmed their potential for their use in immunosensing. (B) Polymeric microparticles (> 0.5 µm) loaded with CsPbBr3 NCs produced by electrospraying method and exposed to cell cultures to analyze their behavior in bioimaging. (C) Polymeric nanobeads (~ 200 nm) loaded with CsPbBr3 NCs were produced by coprecipitation method [3] and tested for fluorescent immunosensing.
This work was financially supported by the E.U FEDER project ADBIHOL /AEI/10.13039/501100011033 from MCIN/AEI and PROMETEO/2020/094 from Generalitat Valenciana. C.C. thanks the Spanish Ministry of Economy and Competitiveness for her predoctoral contract (FPI/17 Scholarship). W. T acknowledges the financial support for the Ph.D studies (FPI-UPV 2019 grants).
C.C. thanks Instituto de Agroquímica y Tecnología de Alimentos (IATA-CSIC) for her admission to their facilities to produce polymeric microparticles by electrospraying under supervision of Mª José Fabra, Amparo López and Vicenta Devesa.
C.C. thanks Istituto Italiano di Tecnologia (IIT), for her admission as visiting PhD student at the Nanochemistry’s group, led by Liberato Manna, and Nanomaterials for Biomedical Applications, led by Teresa Pellegrino, where she learnt the methodology for synthesing polymeric nanobeads.
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