Visible-light absorption and photocatalytic activity of Cr-doped TiO2 nanocrystal films

On the Crystal Structural Control of Sputtered TiO2 Thin Films

“…Currently, two approaches can be used to fabricate pure-phase sputtered TiO 2 films. One is to control the sputtering conditions such as the total gas pressure, substrate temperature and type of sputtering gas to selectively fabricate uniform coatings of rutile or anatase TiO 2 films [1]; the other is to use impurity doping to induce a phase transformation between the anatase and rutile phases [1,[7][8][9][10][11][12][13][14].…”

“…However, the bombardment effects have not been confirmed experimentally, and the mechanism by which the rutile or anatase TiO 2 phase grows during the sputtering process remains unknown. In the case of impurity doping, elements such as Mn [7], Fe [7], Cu [7], Ag [8], Ni [9] and Co [9] have been reported to enhance the phase transition from the anatase to the rutile phase, whereas other elements such as W [7], V [10], Si [11], Nb [12], Ta [12] and Cr [13] have been reported to suppress the anatase-to-rutile phase transition. On the basis of first-principles calculations, the room-temperature phase conversion of anatase to rutile TiO 2 using Co or Ni doping is attributed to the increased interaction between Co and Ni atoms, which results in the formation of a linear chain in the rutile phase [14].…”

Cr-Doped TiO<sub>2</sub> Thin Films Prepared by Means of a Magnetron Co-Sputtering Process: Photocatalytic Application

“…Cr-doping introduces substantial oxygen vacancy as reported by the XPS analysis (Figure 11), the oxygen vacancies in TiO 2 act as electron traps which can bind the photoinduced electrons and play a significant role in inhibiting the recombination rate of photoinduced electron-hole pairs, thus enhancing the photocatalytic activity of TiO 2 [10]. …”

“…To shift the response of photocatalytic activity of TiO 2 from ultraviolet (UV) to visible domain, various works have been carried to tune the band gap of TiO 2 for the efficient absorption of the visible light. Among these studies, there are few attempts on the photocatalytic activity using Cr doped TiO 2 thin films [10]- [13].…”

Ceramic-Based 3D Printed Supports for Photocatalytic Treatment of Wastewater

“…TiO 2 is the most investigated semiconductor catalyst particularly because of its great potential in the treatment of environmental pollution [9] and it is chemically stable, nontoxic, and inexpensive [10][11][12]. However, TiO 2 has an important disadvantage as it is usually commercially available as powder and, therefore, a posttreatment separation stage is needed [13,14] and hence it would be highly desirable to have the possibility of supporting the TiO 2 active phase on other structured inorganic materials.…”