Structural and Electronic Effects of Incorporating Mn in TiO<sub>2</sub>Films Grown by Sputtering: Anatase versus Rutile

Pereira, Aledir Silveira; Gracia, Lourdes; Beltrán, Armando; Lisboa‐Filho, Paulo Noronha; Silva, José H. D. da

doi:10.1021/jp210682d

Cited by 29 publications

(25 citation statements)

References 91 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The spectra are characterized by a good regularity of the interference fringes and a systematic increment in wavelength in which the film practically ceases to be transparent in the visible range. This behavior has been previously observed in TiO 2 doped with metals [33]. The optical gap ( ) of the semiconductor with large band gap can be determined from the absorption coefficient .…”

Section: Resultssupporting

confidence: 72%

Visible Light Photoelectrochemical Properties of N‐Doped TiO₂ Nanorod Arrays from TiN

Xie

Zhang

Liu

et al. 2013

Journal of Nanomaterials

View full text Add to dashboard Cite

N-doped TiO2nanorod arrays (NRAs) were prepared by annealing the TiN nanorod arrays (NRAs) which were deposited by using oblique angle deposition (OAD) technique. The TiN NRAs were annealed at 330°C for different times (5, 15, 30, 60, and 120 min). The band gaps of annealed TiN NRAs (i.e., N-doped TiO2NRAs) show a significant variance with annealing time, and can be controlled readily by varying annealing time. All of the N-doped TiO2NRAs exhibit an enhancement in photocurrent intensity in visible light compared with that of pure TiO2and TiN, and the one annealed for 15 min shows the maximum photocurrent intensity owning to the optimal N dopant concentration. The results show that the N-doped TiO2NRAs, of which the band gap can be tuned easily, are a very promising material for application in photocatalysis.

show abstract

Section: Resultssupporting

confidence: 72%

Visible Light Photoelectrochemical Properties of N‐Doped TiO₂ Nanorod Arrays from TiN

Xie

Zhang

Liu

et al. 2013

Journal of Nanomaterials

View full text Add to dashboard Cite

show abstract

“…The spectra are studied by a high regularity of the interference fringes and a systematic increase in wavelength in which the film practically is no longer transparent in the visible range. This behavior has been previously found in TiO 2 doped with metals [24]. The optical gap (E g ) of the semiconductor with large band gap can be calculated from the absorption coefficient α.…”

Section: Fabrication Of N-doped Tio 2 Nrassupporting

confidence: 75%

Enhanced Visible Light Photocatalytic Performance by Nanostructured Semiconductors with Glancing Angle Deposition Method

Shuang¹,

Xie²,

Zhang³

2016

Semiconductor Photocatalysis - Materials, Mechanisms and Applications

View full text Add to dashboard Cite

The glancing angle deposition (GLAD) method in physical vapor deposition is proved to be a versatile tool to fabricate nanostructured TiO 2 as the photocatalyst on specific substrates to form self-standing structures, which are much easier to be recycled. And novel designs of doping, decorating photocatalytic active substance, are brought in to make TiO 2 respond to visible light. In this chapter, we introduce our previous works such as TiO 2 nanorods with CdS quantum dots, noble metallic nanoparticles, coating TiO 2 via atomic layer deposition (ALD), and so on.

show abstract

“…24,39,40 The Cu 2p XPS spectrum [ Figure 3(h)] shows Cu(II) 2p 3/2 (932.67 eV) and 2p 1/2 (952.83 eV) BE matching the reference values. 47,50 The 3d-orbitals of the dicationic TMs in between the VB and CB of TiO 2 NCs can split if the geometry of host crystal is maintained. 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 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 5...…”

Section: Resultsmentioning

confidence: 99%

Engineered Electronic States of Transition Metal Doped TiO₂ Nanocrystals for Low Overpotential Oxygen Evolution Reaction

et al. 2014

View full text Add to dashboard Cite

Electrochemical oxygen evolution reaction (OER) involves high overpotential at oxygen evolving electrode and thereby suffers significant energy loss in the proton exchange membrane water electrolyzer. In order to reduce the OER overpotential, precious ruthenium and iridium oxides are most commonly used as anode electrocatalyst. Here we report marked reduction in overpotential for the OER using transition metal (TM) doped TiO 2 nanocrystals (NCs). This reduction in overpotential is attributed to d-orbitals splitting of the doped TMs in the TM-doped TiO 2 NCs and their interactions with the oxyradicals (intermediates of OER) facilitating the OER. The d-orbital spitting of TMs in TM-doped TiO 2 NCs is evident from the change in original pearl white color of undoped TiO 2 NCs and UV-vis absorption spectra. Hu et al. reported improved OER activity of IrO 2 /Nb−TiO 2 catalyst as compared to unsupported IrO 2 catalyst. 11 This suggests potential of TiO 2 as electrocatalyst in addition to its advantageous properties of high thermal and chemical stability, lost cost, and commercial availability. Recently, Cai et al. reported enhanced OER with Co-doped TiO 2 nanowires synthesized by sol-flame process. 20 A few other recent reports also confirm the reduction of OER overpotential with TM-doped TiO 2 . 21,22 However, the exact rationality behind such improved performance remains unclear. Here we report reduced overpotential of OER using TM-doped TiO 2 nanocrystals (NCs) synthesized by a facile low temperature hydrothermal technique. This reduced overpotential is attributed to d-orbital splitting of TMs in TiO 2 NCs producing mid gap energy states as confirmed from the UV-vis absorption spectroscopy. The d-orbital splitting of three TMs (Fe, Co, and Cu) and their role in OER overpotential is discussed in the present report. 2. EXPERIMENTAL DETAILS 2.1 Materials. All the chemicals were analytical grade and used as received without further purification. Titanium tetraisopropoxide (TTIP) [99.999%], Cu(NO 3 ) 2 .3H 2 O, Fe(SO 4 ).7H 2 O, Co(NO 3 ) 2 .6H 2 O, tetrabutyl ammonium hydroxide (TBAH) [(C 4 H 9 ) 4 NOH in 0.1 N aqueous], and diethanolamine (DEA) were purchased from Merck. Synthesis of TM doped TiO 2 NCs.In a typical synthesis, 3 mmol of TTIP was added in a mixture of TBAH (40 mmol) and DEA (160 mmol), and stirred for 5 min at room temperature. Then the viscous solution was transferred to a Teflon-lined stainless steel autoclave and heated at 225 °C for 24 h. After the heat treatment, the autoclave was allowed to cool down to room temperature naturally and the product was collected by centrifuge and washed with water and ethanol several times. The final product was dried in air at 60 °C for 24 h. The overall yield of the product was 90−95 %. TM-doped TiO 2 NCs was synthesized by

show abstract

Structural and Electronic Effects of Incorporating Mn in TiO₂Films Grown by Sputtering: Anatase versus Rutile

Cited by 29 publications

References 91 publications

Visible Light Photoelectrochemical Properties of N‐Doped TiO₂ Nanorod Arrays from TiN

Visible Light Photoelectrochemical Properties of N‐Doped TiO₂ Nanorod Arrays from TiN

Enhanced Visible Light Photocatalytic Performance by Nanostructured Semiconductors with Glancing Angle Deposition Method

Engineered Electronic States of Transition Metal Doped TiO₂ Nanocrystals for Low Overpotential Oxygen Evolution Reaction

Contact Info

Product

Resources

About

Structural and Electronic Effects of Incorporating Mn in TiO2Films Grown by Sputtering: Anatase versus Rutile

Cited by 29 publications

References 91 publications

Visible Light Photoelectrochemical Properties of N‐Doped TiO2 Nanorod Arrays from TiN

Visible Light Photoelectrochemical Properties of N‐Doped TiO2 Nanorod Arrays from TiN

Enhanced Visible Light Photocatalytic Performance by Nanostructured Semiconductors with Glancing Angle Deposition Method

Engineered Electronic States of Transition Metal Doped TiO2 Nanocrystals for Low Overpotential Oxygen Evolution Reaction

Contact Info

Product

Resources

About

Structural and Electronic Effects of Incorporating Mn in TiO₂Films Grown by Sputtering: Anatase versus Rutile

Visible Light Photoelectrochemical Properties of N‐Doped TiO₂ Nanorod Arrays from TiN

Visible Light Photoelectrochemical Properties of N‐Doped TiO₂ Nanorod Arrays from TiN

Engineered Electronic States of Transition Metal Doped TiO₂ Nanocrystals for Low Overpotential Oxygen Evolution Reaction