TY - JOUR

T1 - Transition metal dichalcogenide nanospheres for high-refractive-index nanophotonics and biomedical theranostics

AU - Tselikov, Gleb I.

AU - Ermolaev, Georgy A.

AU - Popov, Anton A.

AU - Tikhonowski, Gleb V.

AU - Panova, Daria A.

AU - Taradin, Alexey S.

AU - Vyshnevyy, Andrey A.

AU - Syuy, Alexander V.

AU - Klimentov, Sergey M.

AU - Novikov, Sergey M.

AU - Evlyukhin, Andrey B.

AU - Kabashin, Andrei V.

AU - Arsenin, Aleksey V.

AU - Novoselov, Kostya S.

AU - Volkov, Valentyn S.

N1 - Funding Information: We gratefully acknowledge the financial support from the Ministry of Science and Higher Education of the Russian Federation (agreement 075-15-2021-606). Characterization of fabricated solutions of TMDC nanoparticles (G.I.T.) was supported by the Russian Science Foundation (grant 21-79-00206). Calculation of the extinction spectra (A.A.V.) was supported by the Russian Science Foundation (grant 22-79-10312). Fabrication of TMDC nanoparticles was supported by the Russian Science Foundation (grant 19-72-30012). K.S.N. acknowledges support from the Ministry of Education (Singapore) through the Research Centre of Excellence program (award EDUN C-33-18-279-V12, Institute for Functional Intelligent Materials) and the Royal Society (grant RSRP\R\190000).

PY - 2022/9/27

Y1 - 2022/9/27

N2 - Recent developments in the area of resonant dielectric nanostructures have created attractive opportunities for concentrating and manipulating light at the nanoscale and the establishment of the new exciting field of all-dielectric nanophotonics. Transition metal dichalcogenides (TMDCs) with nanopatterned surfaces are especially promising for these tasks. Still, the fabrication of these structures requires sophisticated lithographic processes, drastically complicating application prospects. To bridge this gap and broaden the application scope of TMDC nanomaterials, we report here femtosecond laser-ablative fabrication of water-dispersed spherical TMDC (MoS2 and WS2) nanoparticles (NPs) of variable size (5 to 250 nm). Such NPs demonstrate exciting optical and electronic properties inherited from TMDC crystals, due to preserved crystalline structure, which offers a unique combination of pronounced excitonic response and high refractive index value, making possible a strong concentration of electromagnetic field in the NPs. Furthermore, such NPs offer additional tunability due to hybridization between the Mie and excitonic resonances. Such properties bring to life a number of nontrivial effects, including enhanced photoabsorption and photothermal conversion. As an illustration, we demonstrate that the NPs exhibit a very strong photothermal response, much exceeding that of conventional dielectric nanoresonators based on Si. Being in a mobile colloidal state and exhibiting superior optical properties compared to other dielectric resonant structures, the synthesized TMDC NPs offer opportunities for the development of next-generation nanophotonic and nanotheranostic platforms, including photothermal therapy and multimodal bioimaging.

AB - Recent developments in the area of resonant dielectric nanostructures have created attractive opportunities for concentrating and manipulating light at the nanoscale and the establishment of the new exciting field of all-dielectric nanophotonics. Transition metal dichalcogenides (TMDCs) with nanopatterned surfaces are especially promising for these tasks. Still, the fabrication of these structures requires sophisticated lithographic processes, drastically complicating application prospects. To bridge this gap and broaden the application scope of TMDC nanomaterials, we report here femtosecond laser-ablative fabrication of water-dispersed spherical TMDC (MoS2 and WS2) nanoparticles (NPs) of variable size (5 to 250 nm). Such NPs demonstrate exciting optical and electronic properties inherited from TMDC crystals, due to preserved crystalline structure, which offers a unique combination of pronounced excitonic response and high refractive index value, making possible a strong concentration of electromagnetic field in the NPs. Furthermore, such NPs offer additional tunability due to hybridization between the Mie and excitonic resonances. Such properties bring to life a number of nontrivial effects, including enhanced photoabsorption and photothermal conversion. As an illustration, we demonstrate that the NPs exhibit a very strong photothermal response, much exceeding that of conventional dielectric nanoresonators based on Si. Being in a mobile colloidal state and exhibiting superior optical properties compared to other dielectric resonant structures, the synthesized TMDC NPs offer opportunities for the development of next-generation nanophotonic and nanotheranostic platforms, including photothermal therapy and multimodal bioimaging.

KW - 2D materials

KW - laser ablation

KW - nanooptics

KW - transition metal dichalcogenides

UR - http://www.scopus.com/inward/record.url?scp=85139311015&partnerID=8YFLogxK

U2 - 10.1073/pnas.2208830119

DO - 10.1073/pnas.2208830119

M3 - Article

AN - SCOPUS:85139311015

VL - 119

JO - Proceedings of the National Academy of Sciences of the United States of America

JF - Proceedings of the National Academy of Sciences of the United States of America

SN - 0027-8424

IS - 39

M1 - e2208830119

ER -