Synthesis and properties of luminescent composite nanoparticles
Сarbon nanostructures (CNSs) have drawn attention in recent years for their high photoluminescence, chemical stability, good biocompatibility, cost-effective, and low toxicity. The unique properties of luminescent CNSs make them became a very promising alternative to replace traditional fluorescent materials.
It is worth noting that the use of a wide variety of synthetic approaches to the production of CNSs does not allow to obtain nanoobjects with similar properties, and in most cases, researchers receive a luminescent product that is a mixture of different structures. The known methods of purification and fractionation of carbon nanostructures in some cases are ineffective, they are more complex and expensive. This problem can be solved by using matrices. The silica matrix is the most attractive because it has a several valuable characteristics: it is optically transparent, biocompatible, has low toxicity, exhibits dielectric properties
In this work, we reported the facile hydrothermal method for the synthesis of luminescent composite nanoparticles. The silica nanoparticles with surface amino and carboxyl groups 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 composite nanoparticles have a maximum luminescence in the area of 450 nm with a quantum yield of 53±4 %. The average size of luminescent composite nanoparticles has a value of (43±2) nm, polydispersity index (0.17±0.01), zeta potential (-27±2) mV.
Podkolodnaya Yulia Andreevna
Saratov State University
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