Nanocomposites and nanomaterials

Optical properties of nanocomposites with P3HT and Ag–TiO2 nanostructures 
Afanasyev D.A.1,2, Ibrayev N.Kh.1, Temirbayeva D.A.1 
1Institute of Molecular Nanophotonics, Buketov Karaganda State University, Universitetskay st. 28A, Karaganda, 100028, Kazakhstan,
E-mail: a_d_afanasyev@mail.ru

2 Institute of Applied Mathematics, Universitetskay st. 28A, Karaganda, 100028, Kazakhstan 

The influence of nanostructures (NSs) «plasmon core (Ag)‒semiconductor shell (TiO2)» on optical properties of semiconductor polymer films of the poly [3-hexylthiophene] (P3HT) was studied. The method for the synthesis of NSs Ag-TiO2 is described in [1, 2]. Mixtures of polymer with NSs Ag-TiO2 in chlorobenzene with polymer concentrations of 0.001% and 1% by weight of the solvent were investigated. The effect of the thickness of the TiO2 shell on absorption and fluorescence spectra of P3HT was also studied.
A comparison of absorption, fluorescence and excitation spectra of P3HT solutions with different concentrations showed that intermolecular interactions of the polymer is observed for the concentration of 1%. The effect of intеrchain interaction on the fluorescence of the polymer is not observed for the solution with the P3HT concentration of 0.001%.
The addition of NSs to polymer solutions doesn’t lead to a change in the optical density of solutions. The fluorescence intensity of the polymer decreases at high concentrations of NSs.
An analysis of the obtained data shows that Ag-TiO2 NSs have a complex effect on electronic processes in the polymer. The effect of plasmon resonance of silver nanoparticles on the fluorescence intensity of the polymer is observed. The quenching of fluorescence is also affected by the TiO2 semiconductor shell.

1.	Afanasyev D.A., Ibrayev N.Kh., Serikov T.M., Zeinidenov A.K. Effect of the titanium dioxide shell on the plasmon properties of silver nanoparticles // Russian Journal of Phys Chem. A. – 2016. 90(4). – Р. 833–837.
2.	Afanasyev D.A., Ibrayev N.Kh., Serikov T.M., Epp A.A. Photoactive nanomaterial with a high specific surface area. Patent for utility model №2064 (The Republic of Kazakhstan), 23.01. 2017.