Photoinduced Charge Transfer in Hybrid Structures Based on Titanium Dioxide NPs with Multicomponent QD Exciton Luminescence Decay

Abstract

Hybrid structures based on TiO 2 nanoparticles and quantum dots (QDs) are effective electron-transfer systems. Here, we report the results of the investigation of photoinduced electron-transfer efficiency in these multilayered hybrid structures, taking into account the resulting multiexponential PL decay of QDs and ROS generation efficiency by the structures. We demonstrate the inhomogeneity of electron-transfer rate in the structures and discuss some reasons for this phenomenon. In this work, for the first time, we estimate electron-transfer efficiency in the TiO 2 /QDs hybrid structures using ROS generation under visible light. We show that the photoinduced electron transfer is the main reason for QD quenching in hybrid TiO 2 -based nanoparticles and propose a way to improve the efficiency of these structures.

Time- and Spectrally-Resolved Photoluminescence Study of Alloyed CdxZn1−xSeyS1−y/ZnS Quantum Dots and Their Nanocomposites with SPIONs in Living Cells

“…The average quenching efficiency can be estimated taking into account the concentration of QDs in each fraction [ 54 ]: …”

Bactericidal Activity of Multilayered Hybrid Structures Comprising Titania Nanoparticles and CdSe Quantum Dots under Visible Light

“…Obviously, any effective bactericidal system has to generate ROS under external radiation and within a broad spectral range, including visible light, which is safe for the human body. The ROS concentration that generated by any bactericidal system and that is based on titania NPs or other metal oxide NPs is univocally related to the number of electrons in the metal oxide conduction band [53]:…”

Development and Characterization of Novel Hybrid Materials Formed from ZnO-SiO2-Modified and Polyaniline for Organic Dyes Adsorption and Electrochemical Supercapacitor Applications

“…Hybrid materials have been widely explored due to their easy elaboration, low-cost production process, exibilities, excellent reproducibility and versatile functionalities [9,10 In nanocomposite devices nanoparticles NPs plays a crucial role in amelioration the electrical and optical properties of the devices. Presently, many investigations have been conducted to study the effect of NPs incorporation into conducting polymer backbone on the electron transfer process, such as charge trapping and detrapping [11,12], the formation of conductive pathways [13] and the charge transfer between the organic products and NPs [14]. Moreover, the Polyaniline (PANI), a recognized promising conducting polymer, has attracted more and more attentions for the π-π conjugated electronic system, high absorption coe cients under visible light, high charge migration and good environmental stability [15,16].…”