Related Experiment Video
Updated: Aug 14, 2026
06:44
Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing
Published on: June 9, 2023
Spray Pyrolysis of Ternary Oxides: From Precursor Selection to Surface Reactions
Karsten Fleischer1,2, Priyanka Bhatnagar1, Ciarán Cooling1
1School of Physical Sciences, Dublin City University, D09 V209 Dublin, Ireland.
Materials (Basel, Switzerland)
|August 13, 2026
Summary
Spray pyrolysis enables low-cost thin-film synthesis. This study details controlling stoichiometry in complex oxides by managing precursor properties and process parameters for improved film quality.
Area of Science:
- Materials Science
- Thin-Film Deposition
- Chemical Engineering
Background:
- Spray pyrolysis is a cost-effective technique for synthesizing thin films.
- Complex oxides (ternary and quaternary) present challenges in stoichiometry control during deposition.
- Understanding precursor behavior and process parameters is crucial for successful thin-film fabrication.
Purpose of the Study:
- To investigate the critical factors influencing stoichiometry transfer in spray pyrolysis for ternary and quaternary oxides.
- To demonstrate how precursor characteristics and experimental setup affect film composition and homogeneity.
- To provide guidance for optimizing spray pyrolysis for complex oxide thin films.
Main Methods:
- Real-time optical monitoring of individual precursor behavior (Cu, Cr, Zn, Sn).
- X-ray photoelectron spectroscopy (XPS) for post-growth film composition analysis.
- Systematic variation of experimental parameters (e.g., instrument geometry, nozzle type) using binary Cu2O as a model.
Main Results:
- Precursor solubility, thermal decomposition, and intermediate species desorption significantly impact stoichiometry.
- Demonstrated control over stoichiometry transfer for ternary transparent conducting oxides (TCOs) like CuₓCrO₂, SnTiOₓ, and a-ZnSnO₃.
- Instrument geometry and nozzle type were shown to influence the homogeneity of binary Cu₂O films.
Conclusions:
- Spray pyrolysis requires careful consideration of precursor chemistry and process parameters for precise stoichiometry control in complex oxides.
- The findings offer insights into overcoming challenges in depositing ternary and quaternary oxide thin films.
- An overview of suitable precursor salts is provided to aid future research in ternary oxide synthesis.
Related Concept Videos
00:52Washing, Drying, and Ignition of Precipitates
After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...
01:22Heterogeneous Catalysis
Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...