Issue 4, 2023

Incorporation of methylene blue into mesoporous silica nanoparticles for singlet oxygen generation

Abstract

Methylene blue is a known photosensitizer with an ability to generate singlet oxygen. The main active species is the monomeric form. However, this dye has a tendency to self-aggregate to form dimers and higher aggregates, which are less active for 1O2 generation. In this study we propose different strategies to incorporate methylene blue into porous silica nanoparticles. The design of the synthesis is a key parameter to avoid both leaching of the dye and its self-aggregation. The negatively charged silica matrix allows the incorporation of the dye, which is cationic, with no leaching, whereas the presence of phenyl functions in the matrix favors the monomeric form of methylene blue (MB). We observe that both dimeric and monomeric forms of MB can generate 1O2 species when confined inside a silica matrix, improving the activity compared to the bare dye in solution.

Graphical abstract: Incorporation of methylene blue into mesoporous silica nanoparticles for singlet oxygen generation

Supplementary files

Article information

Article type
Paper
Submitted
30 sep 2022
Accepted
07 dec 2022
First published
08 dec 2022

New J. Chem., 2023,47, 1861-1871

Incorporation of methylene blue into mesoporous silica nanoparticles for singlet oxygen generation

J. Xu, T. Pelluau, C. Monnereau, Y. Guari, L. Bonneviot, M. Rodríguez-Pizarro and B. Albela, New J. Chem., 2023, 47, 1861 DOI: 10.1039/D2NJ04835C

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