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Titanium dioxide Nanomesh

Titanium dioxide nanomesh can decompose various harmful substances (such as organic chemicals and bacteria) on its surface with strong oxidation, when irradiated by ultraviolet light such as sunlight and fluorescent.


rutile type

anatase type
Titanium dioxide has three different crystal structures; rutile (tetragonal structure, high temperature phase), anatase (tetragonal structure, low temperature phase), and brookite (orthorhombic structure). Rutile has been used as the white pigment; moreover, anatase as photocatalytic material.

Tokita CVD systems offers “Titanium Dioxide Nanomesh” having anatase nanomesh structure.

Features

  • Fine mesh structure with nanometer order has large surface area and, therefore, high photocatalytic activity.
  • Because no binder is used, only anatase TiO2 is deposited on the substrate surface.
  • Excellent adhesion with various substrates, being inherent characteristic of films produced by the CVD technique, is achieved for many uses in solution.



Mesh structure with ∼50 nm
(Left: Titanium dioxide nanomesh grown on the aluminum-base alloy)


XRD pattern of the anatase TiO2 coating deposited by our CVD technique.

Photocatalytic activities of Titanium dioxide nanomesh

Results
  • Acetaldehyde

Sample : 130 × 90 mm2
Sample cell : 5L Tedlar bag
Reagent : acetaldehyde 3L
Detection system : GASTEC 92 M
Measurement range : 2.5 - 100 ppm
Light source : NEC FL20SBL-B
(2 tubes, 1 mW/cm2)


* Measured by Tokita CVD systems
Decomposition test for acetaldehyde by external institute
Acetaldehyde molecules can not been detected at 120 min after the introduction of reagent of 100 ppm.
Examined by Photocatalytic Materials Inc.
  • Ammonia

The decomposition capability of the titanium dioxide nanomesh was evaluated: The concentration of ammonia gas was measured where the gas of ∼ 20 ppm was introduced into the bag every 30 minutes.

Sample : ⟨100 mm
Sample cell : 5L Tedlar bag
Reagent : ammonia 3L

Detection system : GASTEC 3L for ammonia
Detection limit : 0.2 ppm


* Measured by Tokita CVD systems
  • Acetic acid

Sample : ⟨100 mm
Sample cell : 5L Tedlar bag
Reagent : acetic acid 3L

Detection system : GASTEC 81L for acetic acid
Detection limit : 0.05 ppm


* Measured by Tokita CVD systems

Antibacterial test

Antimicrobial activity is examined by reference to the antimicrobial activity test, entitled & Testing method for antimicrobial products -Test for antimicrobial activity and efficacy II (2003), irradiation film adhesion method, Class I", established by Society of Industrial-Technology for Antimicrobial Articles.

Staphylococcus aureus subsp.
   aureus
NBRC 12732
Removal rate 99.8% *2
Escherichia coli NBRC 3972 Removal rate 99% *2
  *2 The value is evaluated from the measurements
by Tokita CVD systems.
Light source : NEC FL20S BL-B 20W
(60-61 μW/cm measured by using UV spectrometer
(Topcon, UVR-2, UD-36)
 
  By Japan Food Research Laboratories
Certified at 19/8/2005 (#205071240-001)