Spin Coating TiO2: Effects of pH & Alcohol Type

  • Thread starter Thread starter venus
  • Start date Start date
  • Tags Tags
    Coating Spin
Click For Summary
SUMMARY

This discussion focuses on the spin coating process of titanium dioxide (TiO2) using titanium tetrachloride (TiCl4) and ethanol as precursors. Users report issues with film cracking, attributing potential causes to the pH level, type of alcohol, and the water content in ethanol. The chemical reaction involved is TiCl4 + ethanol → TiO2 + HCl, with suggestions that water content may lead to unwanted side reactions. Surface tension and wettability of the solution are also highlighted as critical factors affecting the coating quality.

PREREQUISITES
  • Understanding of spin coating techniques
  • Knowledge of chemical reactions involving TiCl4 and ethanol
  • Familiarity with the properties of TiO2 films
  • Basic principles of surface tension and wettability
NEXT STEPS
  • Research the effects of pH on TiO2 film formation
  • Investigate different alcohol types for spin coating
  • Learn about controlling viscosity in spin coating solutions
  • Explore the impact of water content in ethanol on chemical reactions
USEFUL FOR

Researchers and practitioners in materials science, particularly those focused on thin film deposition, spin coating techniques, and the synthesis of titanium dioxide films.

venus
Messages
2
Reaction score
0
Hi everyone!
I'm doing some research on spin coating, my precursor is TiCl4 and I mix it with ethanol, but I have cracks on my films, can anyone help me?
The reaction is:
Ticl4+ ethanol ---> TiO2 + HCl +...
What effects does the pH and the type of alcohol used have? How can I change the viscosity ? Can anyone tell me what happens chemically in this reaction?
 
Chemistry news on Phys.org
Is it a Ti-based substrate which you are coating? What is the temperature and pressure of the process?

Surface tension (wettability) of the solution could be a factor. Have you looked at what other people have done regarding chemical deposition of TiO2 films.

The reaction is:
Ticl4+ ethanol ---> TiO2 + HCl +...

What is the water content of the ethanol? One might be getting TiCl4 + 2 H2O -> TiO2 + 4 HCl and perhaps there are some intermediates that interfere with the precipitation process and hence the cracking.
 

Similar threads

Calculating time to reduce alcohol in wine using heating method
  • · Replies 131 ·
5
Replies
131
Views
11K
Photocatalytic oxidation over TiO2
  • · Replies 3 ·
Replies
3
Views
2K
TiO2 Photocatalyst to replicate making a photocatalytic PVA film
  • · Replies 0 ·
Replies
0
Views
2K
Graduate Spin Coating Issues: Cracks on TiCl4 Films
  • · Replies 1 ·
Replies
1
Views
3K
How Can the Rate of One Reactant Reveal the Whole Reaction in Chemical Kinetics?
  • · Replies 7 ·
Replies
7
Views
3K
Why the diamond-like-carbon coating works well with water?
  • · Replies 1 ·
Replies
1
Views
2K
Disable the effect of HCl on the PH of solution?
  • · Replies 4 ·
Replies
4
Views
3K
How to deal with charge imbalance in a chemical system?
  • · Replies 5 ·
Replies
5
Views
3K
Impact of alcohol and reduced cabin pressure on flights?
  • · Replies 4 ·
Replies
4
Views
3K
Undergrad Gyroscopic precession of a spin-stabilized bullet
  • · Replies 10 ·
Replies
10
Views
5K