Peculiarities of the Structure of Au-TiO2 and Au-WO3 Plasmonic Nanocomposites


Sagidolda Y. Yergaliyeva S. Tolepov Z. Ismailova G. Orynbay B. Nemkayeva R. Prikhodko O. Peshaya S. Maksimova S. Guseinov N. Mukhametkarimov Y.
October 2023Multidisciplinary Digital Publishing Institute (MDPI)

Materials
2023#16Issue 20

As nanotechnology continues to advance, the study of nanocomposites and their unique properties is at the forefront of research. There are still various blank spots in understanding the behavior of such composite materials, especially regarding plasmonic effects like localized surface plasmon resonance (LSPR) which is essential for developing advanced nanotechnologies. In this work, we explore the structural properties of composite thin films consisting of oxide matrices and gold nanoparticles (Au NPs), which were prepared by radio-frequency magnetron sputtering. Titanium dioxide (TiO2) and tungsten trioxide (WO3) were chosen as the host matrices of the composites. Such composite thin films owing to the presence of Au NPs demonstrate the LSPR phenomenon in the visible region. It is shown, that spectroscopic study, in particular, Raman spectroscopy can reveal peculiar features of structures of such composite systems due to LSPR and photoluminescence (PL) of Au NPs in the visible spectrum. In particular, defect peaks of TiO2 (700–720 cm−1) or WO3 (935 cm−1) in Raman spectra can be clearly observed when the samples are illuminated with a 633 nm excitation laser. Excitation with 532 nm leads to a decrease in the intensity of the defect peak, which totally disappears at 473 nm excitation. Such dependences of the defect peaks on excitation laser wavelength are probably related to the polarization of the matrix’s defective regions close to the interface with gold NPs.

gold nanoparticles , oxide thin films , plasmonics , radio frequency magnetron sputtering , Raman spectroscopy

Text of the article Перейти на текст статьи

Department of Physics and Technology, Al-Farabi Kazakh National University, Al-Farabi av. 71, Almaty, 050040, Kazakhstan
National Nanotechnology Laboratory of Open Type, Al-Farabi av. 71/23, Almaty, 050040, Kazakhstan

Department of Physics and Technology
National Nanotechnology Laboratory of Open Type

10 лет помогаем публиковать статьи Международный издатель

Книга Публикация научной статьи Волощук 2026 Book Publication of a scientific article 2026