Solvothermal Synthesis, Characterization, and Formation Mechanism of a Single‐Layer Anatase TiO<sub>2</sub> Nanosheet with a Porous Structure

Chen, Yajie; Tian, Guohui; Ren, Zhiyu; Tian, Chungui; Pan, Kai; Zhou, Wei; Fu, Honggang

doi:10.1002/ejic.201000999

Cited by 22 publications

(17 citation statements)

References 48 publications

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“…Importantly, the solid-state CP/ MAS 13 C NMR spectra ( Fig. 1d) show three well resolved peaks between 70 and 90 ppm (labeled 5) corresponding to the three carbons in glycerolates, in accordance with previous reports 28,29 . Notably, for G-5 there are two small peaks at 20 and 65 ppm (labeled 1 and 3) corresponding to the (-CH 3 , -CH 2 -) and -O-CH 2in butoxy groups 30 , in form of terminal groups due to the insufficient transesterification.…”

Section: Resultssupporting

confidence: 90%

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Manipulating spin polarization of titanium dioxide for efficient photocatalysis

et al. 2020

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Photocatalysis has been regarded as a promising strategy for hydrogen production and highvalue-added chemicals synthesis, in which the activity of photocatalyst depends significantly on their electronic structures, however the effect of electron spin polarization has been rarely considered. Here we report a controllable method to manipulate its electron spin polarization by tuning the concentration of Ti vacancies. The characterizations confirm the emergence of spatial spin polarization among Ti-defected TiO 2 , which promotes the efficiency of charge separation and surface reaction via the parallel alignment of electron spin orientation. Specifically, Ti 0.936 O 2 , possessing intensive spin polarization, performs 20-fold increased photocatalytic hydrogen evolution and 8-fold increased phenol photodegradation rates, compared with stoichiometric TiO 2. Notably, we further observed the positive effect of external magnetic fields on photocatalytic activity of spin-polarized TiO 2 , attributed to the enhanced electron-spin parallel alignment. This work may create the opportunity for tailoring the spin-dependent electronic structures in metal oxides.

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Section: Resultssupporting

confidence: 90%

“…1b and Supplementary Fig. 3), the glycerol C-O stretching vibration bands at 1114 and 1039 cm −1 shift to lower wavenumber from G-5 to G-30, indicating that more glycerol groups coordinate to Ti cations 28,29 . And Raman spectra ( Fig.…”

Section: Resultsmentioning

confidence: 98%

Manipulating spin polarization of titanium dioxide for efficient photocatalysis

et al. 2020

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“…10° and several weak peaks at higher 2θ degree ( Figure S2, SI). 46 From TG analysis (Figure 1a 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 loss of the powders in the range of 200-470 °C is 52.9%, which is close to the theoretical weigh loss (52.1%) of TiGly to TiO 2 . [45][46][47] The solid state CP/MAS 13 C NMR spectrum ( Figure S3, SI) shows three well resolved peaks at 73.8, 80.5 and 85.3 ppm, in accordance with the reported NMR data of TiGly.…”

Section: Formation Of Anatase Tiomentioning

confidence: 99%

Titanium-Defected Undoped Anatase TiO₂ with p-Type Conductivity, Room-Temperature Ferromagnetism, and Remarkable Photocatalytic Performance

et al. 2015

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Defects are critically important for metal oxides in chemical and physical applications. Compared with the often studied oxygen vacancies, engineering metal vacancies in n-type undoped metal oxides is still a great challenge, and the effect of metal vacancies on the physiochemical properties is seldom reported. Here, using anatase TiO2, the most important and widely studied semiconductor, we demonstrate that metal vacancies (VTi) can be introduced in undoped oxides easily, and the presence of VTi results in many novel physiochemical properties. Anatase Ti0.905O2 was synthesized using solvothermal treatment of tetrabutyl titanate in an ethanol-glycerol mixture and then thermal calcination. Experimental measurements and DFT calculations on cell lattice parameters show the unstoichiometry is caused by the presence of VTi rather than oxygen interstitials. The presence of VTi changes the charge density and valence band edge of TiO2, and an unreported strong EPR signal at g = 1.998 presents under room temperature. Contrary to normal n-type and nonferromagnetic TiO2, Ti-defected TiO2 shows inherent p-type conductivity with high charge mobility, and room-temperature ferromagnetism stronger than Co-doped TiO2 nanocrystalline. Moreover, Ti-defected TiO2 shows much better photocatalytic performance than normal TiO2 in H2 generation (4.4-fold) and organics degradation (7.0-fold for phenol), owing to the more efficient charge separation and transfer in bulk and at semiconductor/electrolyte interface. Metal-defected undoped oxides represent a unique material; this work demonstrates the possibility to fabricate such material in easy and reliable way and thus provides new opportunities for multifunctional materials in chemical and physical devices.

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“…Furthermore, the influence of other reaction parameters such as temperature, stirring conditions, and co-solvent (water-ethanol, water-ethylene glycol) on the morphologies of the synthesized nanostructures (nanotubes, nanorods, nanowires, and nanoribbons), as well as their growth mechanism, have been explored [23]. Chen et al [24] reported the One-Dimensional Titanium Dioxide and Its Application for Photovoltaic Devices http://dx.doi.org/10.5772/intechopen.72976…”

Section: Solvothermal Methodsmentioning

confidence: 99%

One-Dimensional Titanium Dioxide and Its Application for Photovoltaic Devices

Mohammed¹,

Bashiri²,

Sufian³

et al. 2018

Titanium Dioxide - Material for a Sustainable Environment

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One-dimensional (1D) TiO 2 nanostructures (e.g., nanotubes, nanobelts, nanowires, and nanorods) have been considered to be very attractive candidates for various applications including photocatalytic degradation of pollutants, photocatalytic CO 2 reduction into energy fuels, water splitting, solar cells, supercapacitors, and lithium-ion batteries. More importantly, the dimensionality associated with zero-dimensional TiO 2 nanostructures gives unique physical properties, including a high aspect ratio structure, chemical stability, excellent electronic or ionic charge transfer, and a specific interface effect. This chapter elaborates on crystal structure and properties, preparation techniques, strategies for improving photocatalytic activity of 1D-TiO 2 nanostructure and its applications. Amongst all preparation techniques, the influence of experimental parameters on morphologies of 1D-TiO 2 nanostructure using hydro/solvothermal method is extensively explained. Furthermore, some critical engineering strategies to enhance the properties of 1D-TiO 2 nanostructures like increasing the surface area, extending the light absorption, and efficient separation of electrons/holes that advantage their potential applications are described. Moreover, a brief summary of their environmental and energy applications is provided.

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Solvothermal Synthesis, Characterization, and Formation Mechanism of a Single‐Layer Anatase TiO₂ Nanosheet with a Porous Structure

Cited by 22 publications

References 48 publications

Manipulating spin polarization of titanium dioxide for efficient photocatalysis

Manipulating spin polarization of titanium dioxide for efficient photocatalysis

Titanium-Defected Undoped Anatase TiO₂ with p-Type Conductivity, Room-Temperature Ferromagnetism, and Remarkable Photocatalytic Performance

One-Dimensional Titanium Dioxide and Its Application for Photovoltaic Devices

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Solvothermal Synthesis, Characterization, and Formation Mechanism of a Single‐Layer Anatase TiO2 Nanosheet with a Porous Structure

Cited by 22 publications

References 48 publications

Manipulating spin polarization of titanium dioxide for efficient photocatalysis

Manipulating spin polarization of titanium dioxide for efficient photocatalysis

Titanium-Defected Undoped Anatase TiO2 with p-Type Conductivity, Room-Temperature Ferromagnetism, and Remarkable Photocatalytic Performance

One-Dimensional Titanium Dioxide and Its Application for Photovoltaic Devices

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Product

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Solvothermal Synthesis, Characterization, and Formation Mechanism of a Single‐Layer Anatase TiO₂ Nanosheet with a Porous Structure

Titanium-Defected Undoped Anatase TiO₂ with p-Type Conductivity, Room-Temperature Ferromagnetism, and Remarkable Photocatalytic Performance