Topotactic transformation of single-crystalline TiOF2 nanocubes to ordered arranged 3D hierarchical TiO2 nanoboxes

Abstract

3D hierarchical TiO 2 nanoboxes, enclosed by six ordered arranged TiO 2 nanorod arrays, were prepared via a templateengaged topotactic transformation process from TiOF 2 nanocubes. The lattice matching between TiOF 2 and anatase TiO 2 was regarded as the key for the preferential growth and ordered arrangement of the TiO 2 nanorods.

Synthesis of NaOH-Modified TiOF2 and Its Enhanced Visible Light Photocatalytic Performance on RhB

“…In Figure 2a,b, TiOF2 crystals displayed a mixture of the cubic image which is accords with the cubic image in [7][8][9][10][11][12][13][14][15][16][17][18]. Each individual particle crystal is about 50-300 nm and tends to aggregate, forming larger particles while-in Figure 2c,d-the NaOH-modified TiOF2 displayed a more complex network shape with network units in about 100 nm.…”

“…Only a few studies focused on the photocatalytic activity of TiOF2 have been reported [7][8][9]. As usual, TiOF2 nanoparticles were synthesized via hydrothermal [10,[14][15][16][17][18] and solvothermal [7,11,12] methods from titanium (IV) isopropoxide (TIP), and have a cubic shape [7][8][9][10][11][12][13][14][15][16][17][18]. The size of TiOF2 nanocubes could be affected by alcoholysis time, alcohol kind, solvothermal temperature, different H2O production rate and amount [7,17].…”

“…Thus, studies on changing morphology [1][2][3], modification [1,4,5], and other methods were conducted to decrease its band gap or inhibit its electron-hole recombination. The discovery of non-titanium semiconductor photocatalysts with a narrow intrinsic energy band gap, efficiently driven by visible light, may also attract much attention [5][6][7][8][9][10][11][12][13].…”

In Situ Fluorine Doping of TiO2 Superstructures for Efficient Visible‐Light Driven Hydrogen Generation

“…[11,13] Attributed to ac ovalent interaction between F and Ti,T iOF 2 was proposed as an F-dopant source to obtain av isible-light photocatalyst for dye degradation. [16] Oner emaining question focuses on how to obtain the n-type F-doping in TMCs with higher contents of Fd uring the topotactic transformation, while understandingt he mechanismso ff ormation. [15] It wasd iscovered that the stability of the reactive (0 01)f acet and crystallization can be improved after the Fspecies was introduced from TiOF 2 .…”

“…[15] It wasd iscovered that the stability of the reactive (0 01)f acet and crystallization can be improved after the Fspecies was introduced from TiOF 2 . [16] Oner emaining question focuses on how to obtain the n-type F-doping in TMCs with higher contents of Fd uring the topotactic transformation, while understandingt he mechanismso ff ormation. The details of the oriented transformation of TMCs and its compatibility with n-type F-doping are not yet reported.…”