Growth behavior of titanium dioxide thin films at different precursor temperatures

Area of Science:

• Materials Science
• Surface Chemistry
• Nanotechnology

Background:

• Titanium dioxide (TiO2) films are vital for photocatalysis, self-cleaning surfaces, and optical coatings.
• Achieving highly hydrophilic TiO2 surfaces with excellent optical properties is a key challenge in materials science.

Purpose of the Study:

• To optimize the deposition of hydrophilic TiO2 films using a single precursor via metal-organic chemical vapor deposition (MOCVD).
• To determine the optimal precursor temperature for achieving superhydrophilic TiO2 films with high optical transmittance.

Main Methods:

• Metal-organic chemical vapor deposition (MOCVD) using titanium tetraisopropoxide as a single precursor.
• Characterization techniques included scanning electron microscopy, Fourier transform infrared spectrometry, UV-Visible spectroscopy, X-ray diffraction, contact angle measurement, and atomic force microscopy.
• TiO2 films were deposited at a substrate temperature of 500°C with precursor temperatures of 75°C (Sample A) and 60°C (Sample B).

Main Results:

• Sample B, with a precursor temperature of 60°C, exhibited a superhydrophilic surface with a contact angle near zero.
• Sample B showed high optical transmittance (76.85% between 400-700 nm).
• Deviations in precursor temperature (below 50°C or above 75°C) resulted in deposition failure or the formation of cloudy films with increased surface roughness.

Conclusions:

• The MOCVD method using titanium tetraisopropoxide is effective for depositing hydrophilic TiO2 films.
• A precursor temperature of 60°C is optimal for achieving superhydrophilic TiO2 films with excellent optical properties.
• Precise control of precursor temperature is critical for successful TiO2 film deposition and surface properties.