Preparation and Mechanism of Ultrafine ZnO Particles by Spray Pyrolysis

Abstract

Ultrafine ZnO particles were prepared by spray pyrolysis method from the aqueous solution of zinc acetate dihydrate, and the influence of operation parameters on the morphology and composition of the particles was investigated. The decomposition degree of particles increased with reaction temperature, decreased with solution concentration and flow rate, and it firstly increased then slightly decreased with air pressure. The particle morphology was related closely with its decomposition degree, uniform sized particles were obtained only at decomposition degree above 90%. For the experimental system, optimum operation conditions were: reaction temperature 650-750°C, solution concentration 0.20-0.50mol/L, solution flow rate 2.0-5.0mL/min, air pressure 0.45-0.55MPa. Pure hexagonal ZnO particles with uniform size of 20-30nm were synthesized under these conditions. A primary particle nucleation-spliting mechanism was established on the base of theoretical analysis and experimental results.

Department(s)

Materials Science and Engineering

Keywords and Phrases

Primary particle; Spray pyrolysis; Thermal decomposition; Ultrafine particles; Zinc oxide

International Standard Serial Number (ISSN)

1000-324X

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 The Authors, All rights reserved.

Publication Date

01 Dec 1996

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