Photoconductivity studies on amorphous and crystalline TiO₂ films doped with gold nanoparticles

详细信息

下载全文

推荐本文 |

• 作者：G. Valverde-Aguilar (1) valverde@fisica.unam.mx
  J. A. Garc铆a-Macedo (1)
  V. Renter铆a-Tapia (2)
  M. Aguilar-Franco (3)
• 刊名：Applied Physics A ; Materials Science & Processing
• 出版时间：June 2011
• 出版年：2011
• 期刊代码：9_0947-8396
• 类别：ch
• 卷：103
• 期：3
• 页码：659-663
• 数据来源：sp

摘要

In this work, amorphous and crystalline TiO₂ films were synthesized by the sol–gel process at room temperature. The TiO₂ films were doped with gold nanoparticles. The films were spin-coated on glass wafers. The crystalline samples were annealed at 100掳C for 30 minutes and sintered at 520掳C for 2 h. All films were characterized using X-ray diffraction, transmission electronic microscopy and UV-Vis absorption spectroscopy. Two crystalline phases, anatase and rutile, were formed in the matrix TiO₂ and TiO₂/Au. An absorption peak was located at 570 nm (amorphous) and 645 nm (anatase). Photoconductivity studies were performed on these films. The experimental data were fitted with straight lines at darkness and under illumination at 515 nm and 645 nm. This indicates an ohmic behavior. Crystalline TiO₂/Au films are more photoconductive than the amorphous ones.