Structure and Formation Model of Ag/TiO2 and Au/TiO2 Nanoparticles Synthesized through Ultrasonic Spray Pyrolysis

Metals - Tập 7 Số 10 - Trang 389
Gözde Alkan1, Rebeka Rudolf2, Jelena Bogović1, Darja Jenko3, Bernd Friedrich1
1IME Process Metallurgy and Metal Recycling, RWTH Aachen, 52056 Aachen, Germany
2Faculty of Mechanical Engineering, University of Maribor, 2000 Maribor, Slovenia
3Institute of Metals and Technology, 1000 Ljubljana, Slovenia

Tóm tắt

This article explains the mechanism of the metal/oxide core-shell Ag/TiO2 and Au/TiO2 nanoparticle formation via one-step ultrasonic spray pyrolysis (USP) by establishing a new model. The general knowledge on the standard “droplet-to-particle” (DTP) mechanism, nucleation, and growth processes of noble metals, as well as physical and chemical properties of core and shell materials and experimental knowledge, were utilized with the purpose of the construction of this new model. This hypothesis was assessed on silver (Ag)/titanium oxide (TiO2) and gold (Au) TiO2 binary complex nanoparticles’ experimental findings revealed by scanning electron microscopy (SEM), focused ion beam (FIB), high-resolution transmission electron microscopy (HRTEM), and simulation of crystal lattices. It was seen that two mechanisms run as proposed in the new model. However, there were some variations in size, morphology, and distribution of Ag and Au through the TiO2 core particle and these variations could be explained by the inherent physical and chemical property differences of Ag and Au.

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