Influences of the iron ion (Fe3+)-doping on structural and optical properties of nanocrystalline TiO2 thin films prepared by sol–gel spin coating

Effect of Fe Concentration on Fe-Doped Anatase TiO2from GGA +UCalculations

“…Fe is considered an appropriate candidate element and has been widely studied [18][19][20][21][22][23][24][25]. Zhang et al [18] [20,21] have found that Fe doping in TiO 2 could narrow the band gap of TiO 2 , thereby increasing the efficiency of the photocatalysis in the visible range. Yalçin et al [22] performed calculations based on density function theory (DFT) to characterize the influence of Fe 3+ doping on the electronic and structural properties of TiO 2 .…”

“…In addition, the Fe 3+ dopant can serve as a charge trap, impeding the electronhole combination rate and enhancing photocatalysis within a range suitable to the concentration of the dopant [17]. Fe is considered an appropriate candidate element and has been widely studied [18][19][20][21][22][23][24][25]. Zhang et al [18] [20,21] have found that Fe doping in TiO 2 could narrow the band gap of TiO 2 , thereby increasing the efficiency of the photocatalysis in the visible range.…”

Structural determination of Co/TiO2 nanocomposite: XRD technique and simulation analysis

“…Doping of TiO 2 by low amounts of foreign elements including transition metals, such as V [6], Mo [7], Fe [8][9][10], Co [11,12], Pt [13], Au [14], Cr [15], Nd [16] is currently attracting considerable interest as a promising route to improve TiO 2 photocatalytic performance under visible-light irradiation [17][18][19]. Some experimental results [20,21] have revealed that co-doping TiO 2 could narrow its band gap, thereby increasing the efficiency of the photocatalysis in the visible range. Co-doped anatase, in particular, is an object of a very large number of publications and review papers [22][23][24][25][26][27][28][29].…”

Synthesis, Optical and Photocatalytic Properties of Mesoporous Iron Doped Titania Films

“…When the iron content is increased, its ions are embedded into titania bulk acting as recombination centers [15]. However, the presence of iron ions in titania led to the narrowing of band gap of the semiconductor forcing to the possibility to absorb quantum of visible light as indicated herein [16]. The band gap energy values of Fe-TiO 2 films varied from 3.3 to 2.8 eV with iron content increase from 0 to 25 %, respectively [17].…”

“…The high photocatalytic activity under visible light as well under UV was rarely reported [9,15]. It is known [5][6][7][8][9][10][11][12][13][14][15][16][17][18] that the physico-chemical properties of iron-doped titania nanostructures are strongly dependent on the synthesis route and its conditions as well as on the doping agent content. Therefore, the properties of materials obtained by different method significantly vary, such as the valence of the elements, electronic structure, morphology of the surface, iron ions distribution, structural properties (the formation of iron titanate or separated oxide phases) and, in turn, photocatalytic activity.…”