Chemical Solution Deposition of Barium Titanate Thin Films with Ethylene Glycol as Solvent for Barium Acetate

Chemical solution deposition (CSD) of BaTiO3 (BT) or BT-based thin films relies on using a carboxylic acid and alcohol as the solvents for alkaline-earth carboxylate and transition-metal alkoxide, respectively; however, the esterification reaction of the solvents may lead to in-situ water formation...

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Bibliographic Details
Published in:Molecules (Basel, Switzerland) Switzerland), 2022-06, Vol.27 (12), p.3753
Main Authors: Konsago, Sabi William, Žiberna, Katarina, Kmet, Brigita, Benčan, Andreja, Uršič, Hana, Malič, Barbara
Format: Article
Language:English
Subjects:
Acetic acid
Acids
Barium
Barium titanates
BaTiO3 thin films
Carboxylic acids
chemical solution deposition
crystallinity
Decomposition
Deposition
Drying
Electric fields
Esterification
Ethanol
Ethylene
ferroelectric
Methyl cellosolve
piezoelectric
Reference materials
Solid solutions
solvent influence
Solvents
Thermal decomposition
Thick films
Thin films
Transition metals
Xerogels
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Summary:Chemical solution deposition (CSD) of BaTiO3 (BT) or BT-based thin films relies on using a carboxylic acid and alcohol as the solvents for alkaline-earth carboxylate and transition-metal alkoxide, respectively; however, the esterification reaction of the solvents may lead to in-situ water formation and precipitation. To avoid such an uncontrolled reaction, we developed a route in which ethylene glycol (EG) is used as the solvent for Ba-acetate. The EG-based BT coating solutions are stable for at least a few months. The thermal decomposition of the BT xerogel obtained by drying the EG-based solutions depends on the choice of the solvent for the Ti-alkoxide as well: in the case of EG and 2-methoxyethanol solvents carbon residues are removed at only about 1100 °C, while in the case of ethanol it is concluded at about 700 °C. About 100 nm thick BT films derived from the EG-ethanol solution deposited on platinized silicon reveal dense, crack-free columnar microstructure. They exhibit local ferro- and piezoelectric properties. The macroscopic polarization-electric field loops were obtained up to a quite high electric field of about 2.4 MV/cm. The EG-ethanol based CSD route is a viable alternative to the established acetic acid–alcohol route for BT and BT-based films.
ISSN:1420-3049
1420-3049
DOI:10.3390/molecules27123753