Synthesis and properties of silica nanoparticles modified with luminescent carbon nanostructures
Yulia A. Podkolodnaya, Alina A. Kokorina, and Irina Y. Goryacheva
Saratov State University, 83 Astrakhanskaya Street, Saratov, 410012, Russia
Abstract
Luminescent carbon nanostructures (LCNs) are a new generation of optical structures primarily consisting of carbon with different heteroatoms like oxygen, hydrogen, nitrogen, etc. They draw the interest of many researchers due to their small size, unique optical properties, functionalized surface, nontoxicity, photostability, and a large variety of starting reagents. All described properties provide LCNs application in chemical analysis, bioimaging, or nanomedicine.
However, there are a few difficulties correlates with the quenching effects of LCNs with large size molecules such as antibodies, proteins, or polymers. This problem can be reduced by the application of the silica matrix modified with LCNs. Moreover, the application of the matrix method can be more prospective for the applications due to the increase of luminescent intensity of one label by the presence of several LCNs. Silica nanoparticles are optically transparent materials that can be combined with any desired fluorophore to form a chemically and physically stable luminescent particle. By varying the conditions of the synthesis of silica nanoparticles, it is possible to control the size, achieve low dispersion, as well as surface modification by various functional groups.
In this work, we reported the facile hydrothermal method for the synthesis of luminescent silica nanoparticles. The silica nanoparticles with surface amino groups and the sizes of ~35 nm were prepared by the reversed microemulsion method. The obtained silica nanoparticles were hydrothermally treated with citric acid (0.01M) at 180C for 3 hours. The resulting silica nanoparticles modified with luminescent carbon nanostructures have a maximum luminescence in the area of 450 nm with a quantum yield of 63±4 %. Obtained luminescent structures were separated by dialysis, gel electrophoresis, and explored by optical methods.
The work was supported by the Russian Ministry of Education and Science (project № FSRR-2020-0002)
Speaker
Podkolodnaya Yulia Andreevna
Saratov State University
Russia
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