Advance in ultrasonic spray pyrolysis (USP) for the synthesis of gold nanoparticles
Introduction/purpose: Ultrasonic spray pyrolysis (USP) is usually used for the preparation of submicronic and nanosized gold powders. This is a simple method for a synthesis from an aerosol containing dissolved metallic salts such as gold chloride, gold nitrate, and gold-acetate, obtained in the...
Guardado en:
| Autores principales: | , |
|---|---|
| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
University of Defence in Belgrade
2020
|
| Materias: | |
| Acceso en línea: | https://doaj.org/article/6a2e248d87054eec8af27ad99a211224 |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| Sumario: | Introduction/purpose: Ultrasonic spray pyrolysis (USP) is usually used for
the preparation of submicronic and nanosized gold powders. This is a
simple method for a synthesis from an aerosol containing dissolved
metallic salts such as gold chloride, gold nitrate, and gold-acetate,
obtained in the ultrasonic field using frequencies ranging from 0.8 to 2.5
MHz.
Methods: The USP method combines aerosol formation in an ultrasonic
field, transport of an aerosol with a carrier gas to the reactor and final
reduction of HAuCl4 with a used gas such as hydrogen and carbon
monoxide. The thermal decomposition of gold acetate takes place in a
neutral atmosphere such as nitrogen and argon at elevated temperatures.
The chemical reduction of HAuCl4 takes place in the aqueous phase using
sodium citrate and sodium boride after heating water solution.
Results: Powders of gold were obtained at room temperature using
hydrogen reduction in an ultrasonic field at room temperature from HAuCl4
using a frequency of 0.8 MHz. The obtained gold particles were analysed
using scanning electron microscopy (SEM) and energy disperse
spectroscopy (EDS). The formed particles are round and agglomerated.
An increase in temperature to 260°C and 500°C leads to the formation of
spherical and cylindrical gold particles.
Conclusion: New improved equipment for an ultrasonic spray pyrolysis
synthesis of gold powder from HAuCl4 with hydrogen reduction was
offered by PRIZMA, Kragujevac, Serbia, enabling a controlled reduction
process with better prevention of piezo transducers in an ultrasonic field
and increased aerosol production and its transport to the reaction furnace.
|
|---|