Controlled synthesis and electrical conduction properties of anatase TiO2 nanoparticles via the polyol method

Abstract

This paper reports the preparation and characterization of titanium dioxide nanoparticles (TiO 2 -NPs) with pure anatase phases using polyol synthesis process. The preparation state and the particle size are controlled by varying the synthesis parameters such as the precursor concentration, hydrolysis rate and the synthesis time. Nanoparticles were characterized by X-ray diffractometry, TEM, FT-IR spectroscopy and the measure of the complex impedance spectroscopy. Their physicochemical properties were investigated to optimize the synthesis conditions. FT-IR spectra exhibit broad peaks where anatase phases of TiO 2 demonstrate very sharp peaks. The structural characterization by XRD confirms that there is a formation of anatase TiO 2 -NPs phases at 550°C and the crystalline size is in the range of 19-25 nm. The crystallite size of the TiO 2 core decreases with the concentration of titanium tetrachloride TiCl 4 precursor. Electrical properties and relaxation phenomenon of the material were studied at several temperatures.

Enhanced Photocatalytic Activity of Vanadium-Doped SnO2 Nanoparticles in Rhodamine B Degradation

“…ese important properties are crucial to make SnO 2 NPs as a practical candidate for various applications, namely, gas sensing [21,22], optoelectronic devices [23,24], dye-based solar cells [25], and photocatalytic processes [26]. us, SnO 2 NPs have been synthesized using several techniques such as thermal evaporation [27], polyol method [28][29][30], chemical precipitation [31], sol-gel method [32], hydrothermal method [33,34], and coprecipitation methods [35,36]. Among these various methods, the coprecipitation method was chosen in this study, thanks to its important advantages including its low fabrication cost, simplicity, high purity, good reproducibility, and low operation temperature.…”

Cell-Biological Response and Sub-Toxic Inflammatory Effects of Titanium Dioxide Particles with Defined Polymorphic Phase, Size, and Shape

“…Our aim was to close this gap and to synthesize monodisperse and colloidally stable particles by sol-gel chemistry, which enables control over particle size, shape, and crystal form [ 24 , 25 , 26 , 27 ]. We pursued various synthetic routes to prepare particles with well-defined properties.…”

Enhancement of dielectric responses and conduction properties of Zn-doped TiO2 for energy storage and photosensitivity applications

“…Also, it has a relatively high refractive index and dielectric permittivity [2], making it promising for various applications, such as: positive electrode in batteries, transparent conducting electrodes in photovoltaic devices, gas sensors and photocatalytic degradation of organic dyes for water and air purification, self-cleaning surfaces, and antibacterial activity [3][4][5][6]. Several physical and chemical methods have been used to prepare TiO2 nanoparticles and thin films, such as co-precipitation [7][8], polyol method [9], RF sputtering [10], chemical vapor deposition (CVD) [11], pulsed laser deposition [12] and spray pyrolysis [13]. Moreover, many efforts have been conducted to obtain nanopowders with desirable physical and/or chemical properties.…”