PREPARATION AND CHARACTERIZATION OF TiO2 COATINGS WITH DIFFERENTS DOPANTS ON GLASS Tutor: Josef Mato

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PREPARATION AND CHARACTERIZATION OF TiO2
COATINGS WITH DIFFERENTS DOPANTS ON GLASSTutor
Josef Matouek
Student Liliana Rodriguez Paez
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ObjectivePreparation of titanium dioxide and
mixed oxide layers and their comparation with
respect to chemical a optical properties
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MethodProcess sol-gel applied for the
preparation of transparent layers on glass
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Components of TiO2 Solution
Tetra-n-butyl-orthotitanate
Precursor
Acid Acetic
Catalyst
Solvent
Ethanol
Water
For gelation
For Peptization
Acetylacetone
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Process for preparation of TiO2-0.25MnO solution
Mn(NO3)2 . 4H2O 1.88 g (7.5 mmol)
Tetra n-butyl-orthotitanate 10.21 ml (30 mmol)
CH3COOH 2.57 ml (45 mmol)
CH3COOH 0.64 ml (11.19 mmol)
C2H5OH 29.80 ml (510 mmol)
C2H5OH 7.45 ml (127.5 mmol)
Yellow solution
Gelation with H2O 7.60 ml (420 mmol)
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Gel
Peptization with acetylacetone 3.10 ml (30 mmol)
Final solution
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Process for preparation of TiO2-V2O5 solution
Tetra-n-butyl-orhtotitanate 10.21ml (30 mmol)
V2O5 0.17 gr (0.93 mmol)
CH3COOH 2.57 ml (45 mmol)
H2O2
C2H5OH 29.80ml (510mmol)
Solution B
Solution A
Red solution
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Red solution
Gelation with H2O 7.60 ml(420 mmol)
Peptization with acetylacetone 3.10 ml (30 mmol)
Final solution
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Conditions for preparation of coatings

• Microscope slide or silica glass substrate

• In the dip coating process withdrawing
• at a speed of around 10 cm min-1

3. Drying of films at 80C for 2 hours
4. The films heated to different temperatures
500-800C
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Dip Coating

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Analyses realized
1. Measuring of the absorbance in UV region.
2. Measuring of corrosion in water
3. DTA a TG analyses
4. XRD analyses
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Measurement of absorbance TiO2 films
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Measurement of absorbance TiO2-MnO films
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Graph of Naconcentration vs time
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DTA of TiO2-MnO gel
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Influence of Time, number of
films and temperature on
Crystallite form
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Conclusions

• The TiO2-MnO films present a higher absorbance in
  UV region
• than the films of TiO2.

• The TiO2-MnO films protect the substrate against
  corrosion
• if they are exposed to water for a longer
  time
• (above 32 hours)

• The films present good adhesion and good
  homogeneity on glass
• substrate.

• Anatase as the main crystalline form was detected
  by XRD analysis
• in the films burned out at the range of
  500-700C.
• 5. The anatase-to-rutile phase transformation
  started at 600-700C.

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References

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  Materials Letters
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