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Metals 2017, 7(10), 389; doi:10.3390/met7100389

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

1
IME Process Metallurgy and Metal Recycling, RWTH Aachen, 52056 Aachen, Germany
2
Faculty of Mechanical Engineering, University of Maribor, 2000 Maribor, Slovenia
3
Institute of Metals and Technology, 1000 Ljubljana, Slovenia
*
Author to whom correspondence should be addressed.
Received: 31 July 2017 / Revised: 31 August 2017 / Accepted: 18 September 2017 / Published: 25 September 2017
(This article belongs to the Special Issue Powder Synthesis and Processing)
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Abstract

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. View Full-Text
Keywords: ultrasonic spray pyrolysis; core shell nanostructure; formation mechanism; TiO2; Ag; Au ultrasonic spray pyrolysis; core shell nanostructure; formation mechanism; TiO2; Ag; Au
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Alkan, G.; Rudolf, R.; Bogovic, J.; Jenko, D.; Friedrich, B. Structure and Formation Model of Ag/TiO2 and Au/TiO2 Nanoparticles Synthesized through Ultrasonic Spray Pyrolysis. Metals 2017, 7, 389.

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