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Controllable spherical aggregation of monodisperse carbon nanodots

Abstract

Monodisperse carbon nanodots (MCNDs) having identical composition, structure, shape and size possess in this way identical chemical and physical properties, making them highly promising for various technical and medical applications. Herein, we report a facile and effective route to obtain monodisperse carbon nanodots 3.5±0.9 nm in size by thermal decomposition of organosilane within the pores of monodisperse mesoporous silica particles with subsequent removal of silica template. Structural studies demonstrated that the MCNDs we synthesized are constituted by ~7–10 defective graphene layers that are misoriented with respect to each other and contain various oxygen-containing functional groups. It was demonstrated that, owing to their identical size and chemical composition, the MCNDs form via coagulation primary aggregates ~10–30 nm in size, which are, in turn, combined into secondary porous spherical aggregates ~100–200 nm in diameter. The processes of coagulation of MCNDs and peptization of their hierarchical aggregates are fully reversible and can be controlled by varying the MCND concentration or the pH values of the hydrosols. Submicrometer spherical aggregates of MCNDs are not disintegrated as the hydrosol is dried. The thus obtained porous spherical aggregates of MCNDs are promising for drug delivery as a self-disassembling container for medicinal preparations.

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Publication details

The article was received on 06 Mar 2018, accepted on 06 Jun 2018 and first published on 07 Jun 2018


Article type: Paper
DOI: 10.1039/C8NR01900B
Citation: Nanoscale, 2018, Accepted Manuscript
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    Controllable spherical aggregation of monodisperse carbon nanodots

    D. Kurdyukov, D. Eurov, M. Rabchinskii, A. Shvidchenko, M. Baidakova, D. Kirilenko, S. Koniakhin, V. Shnitov, V. Sokolov, P. N. Brunkov, A. Dideikin, Y. Sgibnev, L. Mironov, D. Smirnov, A. Vul and V. Golubev, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR01900B

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