Abstract
This study aims to apply the titanium oxide as an electrophotographic material. At first the physical properties of solid state TiO2 are described; these are the dark conductivity, the photoconductivity and the dielectric property. Afterwards we investigated for the application of TiO2 to the electrophotograhic fax paper.
The conductivity of TiO2 is 10-12~10-14Ω-1cm-1 at room temperature. The photoconductivity observed is 102~103 times as large as the dark current at the light of 1000 L/cm2. We measured the wave length dependence of photoconductivity. The photocurrent of TiO2 single crystals shows a maximum at the wave length 4280Å (2.88ev), but the maximum peak of TiO2 powder is found at the wave length 4000Å (3.01eV). The dielectric constant of TiO2 single crystal is C//173, C⊥89, and that of powder is 114. The dielectric constant has an importance for the electro-static potential of the electrofax process. We have discovered that the anti-humidity of TiO2 electrofax paper can be improved by adding SrTiO3 (ε≈1000 at R.T.) of 5~7 wt%.
From this study the following can be said: We have to improve the sensitivity of photoconduction of TiO2 for the electrographical application, but even at the present, TiO2 can be applied to the electrophotographic“scribing”technique.
