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Dhanus
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Quote Dhanus Replybullet Topic: Preparation of transparent TiO2 films.
    Posted: 05 November 2001 at 11:49pm

Now, I am studying in Toyama University, Japan. I will do a research about degradation of water pollutant by TiO2 photocatalytic. The point is I want to know about detail preparation of transparent TiO2 thin film. Please tell me if know about that.

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M.Prassas
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Quote M.Prassas Replybullet Posted: 06 November 2001 at 2:32am

There is a myriad of TiO2 preparation recipes. Follows one I have worked on

170 cc Iso propanol 12 cc Ti(isoPro)4 0.4 cc HCl 2M (10 min.)

Mix Ti precursor and Alcohol.
Add drop by drop under stirring the HCl
Wait 24h before making a coating.
The solution can be deposited either by spinning or dipping. Cure the film at 120°C 1h and if needed at higher temperature.

Varying the HCl content can drastically changes the textural properties of the film. Try it.

Good luck

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fmvichi
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Quote fmvichi Replybullet Posted: 09 December 2002 at 1:36pm

There are other recipes:

I have successfully prepared transparent TiO2 films the following way:

200 mL deionized water

13 mL Ti isopropoxide

3 mL Conc. nitric acid

Mix water and acid. Add alcoxide slowly. A suspension is formed, which after 5-8 days becomes translucent - a sol. Use this to coat yor substrate by dip-coating, slip-casting or spin-coating.

Good Luck

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gabonino
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Quote gabonino Replybullet Posted: 27 December 2002 at 10:00pm

fmvichi:

Do you have by any chance some information about a preparation using two Precursors: TEOS and Ti(iPr)4 ? I would sincerely appreciate some information about it

Oscar Gabriel Niño A.
Chemical Engineer
Universidad Nacional de Colombia
M. Sc. Process and Energy Engineering
Technische Universität Berlin
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advancest
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Quote advancest Replybullet Posted: 02 January 2003 at 4:23am

Regarding the receipe provided by M Prassas (given in the first reply to this topic), i have found that it gives quite good thin coatings. However, the sol gels very fast (two days). Is there a way to prepare sol lasting for say 10 days?

 

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Quote administrator Replybullet Posted: 02 January 2003 at 9:52am

You have three ways to increase the pot life of your solution:

1. Decrease the HCl/Ti(OR)4 ratio

2. Decrease Ti(OR)4 /Iso propanol ratio

3. Do both

Good Luck

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Muepfi
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Quote Muepfi Replybullet Posted: 04 February 2003 at 5:04am

Dear Fmvichi,

I tried to prepare thin TiO2 thin films by using your recipe. The preparation of the sol worked well (it became translucent after only one day).

But the deposition by dip-coating (0,2 cm/s) on soda-lime glass doensn't worked. I've got problems with the wettability. Any ideas what's wrong????

thank you for any kind of help.

best wishes

 

Heike Stuhldreher 

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Quote administrator Replybullet Posted: 06 February 2003 at 9:53am
Try M.Prassas recipe. ADVANCEST said that it works great.
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xyuan
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Quote xyuan Replybullet Posted: 14 February 2003 at 6:19pm

There are streaks emanating from the center of the wafer for SPIN-coated TiO2 films. Does anyone know how to solve the problem? The sol is transparent and can last at least a week or even longer. Thanks very much.

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Nai74
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Quote Nai74 Replybullet Posted: 19 February 2003 at 11:35am

Urgent!

hi, I had deposited thin film of TiO2 on sapphire. But, It 's important for me to remove in order to use the sapphire crystal. What's the mean manner or technique used?

thank you for help..

Naimi Boubekeur
Ph.D. Thesis
LPMO - CNRS
32, avenue de l'Observatoire
F-25044 Besançon Cedex France
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