Nanocomposites and nanomaterials

Research of plasmonic properties of the copper sulfide nanostructures 
Vernyhor O., Sosenko S., Bulavinets T., Yaremchuk I., Fitio V., Bobitski Y.
Department of Photonics, Lviv Polytechnic National University,
S. Bandery str. 12, Lviv, 71013, Ukraine. 
E-mail: iryna.y.yaremchuk@lpnu.ua

In this work, the results of the study on optically active copper sulfide nanostructures have been presented. Copper sulfide nanostructures are currently under intense research due to their reliable, non-toxic, and cheap alternatives to the noble metals used in many applications [1]. Copper sulfide is a semiconductor material; however, a compound of the copper sulfide family demonstrates the strongest p-type metal behavior since it has the largest number of free carriers. Thus, this compound exhibits an intense plasmon resonance peak. It should be noted that the plasmon peak of this material is centered in the NIR region. This feature makes copper sulfide nanostructures incredibly attractive from the point of view of their application for in vivo applications that require agents launched by NIR [2]. The spectral characteristics of the copper sulfide nanostructures under the conditions of localized plasmon resonance have been studied. The influence of nanostructures deformation, namely prolate and oblate nanoparticles, on their optical characteristics has been researched. The size-dependence of the localized surface plasmon resonance peak intensity and peak position have been studied. The strong dependence of the localized surface plasmon resonance effect on the dielectric permittivity of the surrounding medium was checked.

Financial support of Ministry of Education and Science of Ukraine should be acknowledged (DB/Interface, DB/MEV)

1.	Liu Y., Liu M., Swihart M.T. Plasmonic copper sulfide-based materials: a brief Introduction to their synthesis, doping, alloying, and applications.//The J of Phys. Chem. C-2017.-121.-P. 13435-13447.
2.	Liu Y., Ji M., Wang P. Recent advances in small copper sulfide nanoparticles for molecular imaging and tumor therapy.// Molecular pharmaceutics.-2019.-16.-P. 3322-3332.