Ultrasonic spray pyrolysis for nanoparticles synthesis

Tsai, Shirley C.; Song, Yen-Ling; Tsai, C.S.; Yang, C. C.; Chiu, Wen‐Yen; Li, Hongming

doi:10.1023/b:jmsc.0000030718.76690.11

Cited by 141 publications

(68 citation statements)

References 15 publications

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“…All the general knowledge for the USP process [31][32][33] can be transferred directly to the model for the noble metal/oxide particle formation. For these systems, an initial precursor solution with two components experience all the fundamental USP process steps, such as evaporation, precipitation, thermal decomposition, and drying; however, not at the same time-volume point for both components.…”

Section: Formation Model and Validationmentioning

confidence: 99%

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

Alkan

Rudolf

Bogovic

et al. 2017

Metals

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This article explains the mechanism of the metal/oxide core-shell Ag/TiO 2 and Au/TiO 2 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 (TiO 2 ) and gold (Au) TiO 2 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 TiO 2 core particle and these variations could be explained by the inherent physical and chemical property differences of Ag and Au.Keywords: ultrasonic spray pyrolysis; core shell nanostructure; formation mechanism; TiO 2 ; Ag; Au Motivation and BackgroundCore shell complex nanostructures comprised of binary systems have been the focus of great interest due to their high functionality [1,2]. Preserving the core material's properties and modifying the surface with another material multiplies properties and, owing to the core/shell interface, superior performance has been introduced to a system that cannot be achieved by a single constituent. In recent studies, it was seen that thin surface layers on fine particles affect various properties substantially, such as chemical and thermal stability [3], catalytic activity [4], optical, magnetic, and electrical properties [5][6][7][8].Among various combinations of materials that have been utilized as core-shell systems this study targets on inorganic-inorganic group of Ag/TiO 2 and Au/TiO 2 . TiO 2 is proposed as a core material due to its inertness, chemical stability, and non-toxic nature [9]. It is a crystalline material with three polymorphic phases; anatase (tetragonal), rutile (tetragonal), brookite (orthorhombic), with an order of enthalpy of formation as; ∆H f (rutile) < ∆H f (brookite) < ∆H f (anatase) [10,11]. Regarding the energetics of three polymorphs, rutile is the most stable phase, thermodynamically. However, these three compounds have a surface energy order as; 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)...

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Section: Formation Model and Validationmentioning

confidence: 99%

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

Alkan

Rudolf

Bogovic

et al. 2017

Metals

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“…The general spray pyrolysis process always involves four major steps [34,41,44,45]: generation of droplets from a precursor solution; shrinkage of droplet size due to evaporation; conversion of the precursor into oxides; and formation of solid particles. Evaporation of the solvent, diffusion of the solute, drying, pyrolysis, and sintering may occur in the formation of particles, among which solvent evaporation has been demonstrated to be critical to product porosity.…”

Section: Possible Formation Mechanism Of Mesoporesmentioning

confidence: 99%

Mesoporous transition alumina with uniform pore structure synthesized by alumisol spray pyrolysis

Liu

2010

Chemical Engineering Journal

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a b s t r a c tMesoporous transition alumina was prepared by spray pyrolysis of an alumisol precursor, without the use of structure-directing reagents. The prepared alumina exhibited a well-defined mesoporous structure with narrow pore size distribution (3.0-4.7 nm). Preparation temperature played a major role in the phase formation and the porosity of prepared alumina. The phase transformation of boehmite to ␥-Al 2 O 3 andAl 2 O 3 was observed at 800 and 1200• C, respectively. An increase in preparation temperature resulted in a decrease in surface area and pore volume and an increase in pore size. Longer residence time promoted the crystallinity of prepared alumina effectively, but it also led to the formation of particles with smaller surface area, lower pore volume, larger pore size, and broader pore size distribution. Additionally, while alumisol concentration had little effect on the surface area, its reduction led to a decrease in pore volume and pore size and caused the formation of bimodal pore size distribution. The as-prepared alumina also exhibited excellent thermal stability, showing great application potential for industry.

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“…A review by Messing et al (1993) has shown that spray pyrolysis has been used for the synthesis of particles of micron size, producing various metal powders. Tsai et al (2004) used ultrasonic spray pyrolysis and observed that uniform particles of 90 nm can be synthesized from smaller droplets whereas larger droplets generated porous particles. Pluym et al (1993) used three types of aerosol generators in synthesizing solid, spherical, micron-sized silver metal particles.…”

Section: Introductionmentioning

confidence: 99%

Silver Nanoparticles from Ultrasonic Spray Pyrolysis of Aqueous Silver Nitrate

Pingali

Rockstraw

Deng

2005

Aerosol Science and Technology

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Silver particles less than 20 nm in diameter were synthesized by pyrolysis of an ultrasonically atomized spray of highly dilute aqueous silver nitrate solution at temperatures above 650• C and below the melting point of silver. Feed solution concentration and ultrasound power applied to the atomizer were found to have a significant impact on the particle size of the silver nanoparticles. Average particle size was found to be controllable in the range of 20 nm to 300 nm by varying the solution concentration and the ultrasound power to the atomizer.

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Ultrasonic spray pyrolysis for nanoparticles synthesis

Cited by 141 publications

References 15 publications

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

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

Mesoporous transition alumina with uniform pore structure synthesized by alumisol spray pyrolysis

Silver Nanoparticles from Ultrasonic Spray Pyrolysis of Aqueous Silver Nitrate

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