Nanocomposites and nanomaterials

CdS:Au nano-particles nanocomposite structural study
Kusnezh V.V.1, Il’chuk H.A.1
1 Physics Department, Lviv Polytechnic National University, S. Bandery 12, 79013 Lviv, Ukraine. 
E-mail: v.kusnezh@gmail.com

The purpose of our study was to investigate the influence of Au NPs array decorated on the top and embedded in the CdS semiconductor thin film on the structural properties of the CdS:Au nano-particles nanocomposite film.
The CdS:Au NPs nanocomposite films were fabricated by a combination of the CdS thin film RF-magnetron sputtering and Au NPs chemical deposition detail description can be found in [1,2]. Absorption spectra of the samples manifest simultaneous CdS fundamental absorption edge located at ~2.40 eV and the plasmonic absorption maximum located at 2.08-2.25 eV region depending on Au NPs array location. 
The Raman spectra of the CdS films with the Au NPs array located on top and embedded in the film were characterized by the micro-Raman technique. The measurements were performed at room temperature with the help of the T64000 Jobin-Yvon spectrometer configured in backscattering geometry and the triple subtractive mode of operation equipped with a multichannel CCD camera (illuminated spot ~1 μm). The samples were excited by an Ar2+ laser working at a wavelength of 514.5 nm. Micro-Raman spectra were recorded for constant laser power of 250 μW and laser exposure time of 20 s. Each of the phonon wavenumbers was extracted by fitting the experimental curves with the Lorentzian function. The following phonon modes 1LO, 2LO and 3LO have been found in the micro-Raman spectrum of investigated samples as well as the band corresponding to multiphonon processes.

1.	Kusnezh V., Il'chuk H., Kluczyk K., Gwóźdź K., Petrus R., Tsyupko F., Biegański P., Płaczek-Popko E. Fabrication and photosensitivity of structures based on CdS:Au nano-particles nanocomposite // J Alloys Compd.-2018.-746.-P. 471-476.
2.	Kusnezh V., Il'chuk H., Tsyupko F., Kluczyk K., Płaczek-Popko E., Gwóźdź K., Biegański P. Chemical surface growth and physical properties of the Au nanoparticles array on glass slides // Materials Science-Poland.-2018.-36.-P. 42-45.