Visible Light Responsive Nitrogen Doped Anatase TiO<sub>2</sub> Sheets with Dominant {001} Facets Derived from TiN

Liu, Gang; Yang, Hua Gui; Wang, Xuewen; Cheng, Liang; Pan, Jian; Lu, Gao Qing; Cheng, Hui‐Ming

doi:10.1021/ja903463q

Cited by 573 publications

(370 citation statements)

References 24 publications

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“…41% exposed {001} facets, obtained by hydrothermal treatment of TiS 2 and HF, showed increased visible light absorption in the 400-550 nm range with respect to pure anatase TiO 2 sheets. Moreover, some visible-light photocatalytic activity in • OH radicals generation and organic dyes photodecomposition was obtained with these S-doped TiO 2 sheets [49], but this activity was lower than that obtained by employing nitrogen-doped TiO 2 materials with 60% {001} facets [48]. The amount of fluorine species detected on S-TiO 2 and N-TiO 2 nanosheets was at ca.…”

Section: Doped Anatase Tio 2 With Large Percentage Of {001} Facetsmentioning

confidence: 88%

“…All precursors can apparently be used for tailoring both the percentage of {001} facets and the particles size, soluble precursors thus appearing not discriminating in growing the desired pure anatase crystals. However, some very recently employed insoluble precursors, such as Ti [46,47], TiN [48], TiS 2 [49] and TiB 2 [50] crystalline powders, seem to ensure unique properties consequent to TiO 2 doping, including visible light absorption and oxygen deficiencies formation.…”

Section: Doped Anatase Tio 2 With Large Percentage Of {001} Facetsmentioning

confidence: 99%

“…60% {001} facets. As shown in Figure 6, the so prepared photocatalyts showed a visible absorption edge in the 400-570 nm range and also superior hydrogen evolution rate under visible light irradiation with respect to both the corresponding undoped anatase TiO 2 sheets and nitrogen doped anatase without dominant {001} facets [48]. The main key strategy in this route is the use of a crystalline compound, titanium nitride (TiN), as both titanium precursor and nitrogen doping source.…”

Section: Doped Anatase Tio 2 With Large Percentage Of {001} Facetsmentioning

confidence: 99%

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Specific Facets-Dominated Anatase TiO2: Fluorine-Mediated Synthesis and Photoactivity

2013

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Semiconductors crystal facet engineering has become an important strategy for properly tuning and optimizing both the physicochemical properties and the reactivity of photocatalysts. In this review, a concise survey of recent results obtained in the field of specific surface-oriented anatase TiO 2 crystals preparation is presented. The attention is mainly focused on the fluorine-mediated hydrothermal and/or solvothermal processes employed for the synthesis and the assembly of anatase micro/nanostructures with dominant {001} facets. Their peculiar photocatalytic properties and potential applications are also presented, with a particular focus on photocatalysis-based environmental clean up and solar energy conversion applications. Finally, the most promising results obtained in the engineering of TiO 2 anatase crystal facets obtained by employing alternative, possibly more environmentally friendly methods are critically compared.

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Section: Doped Anatase Tio 2 With Large Percentage Of {001} Facetsmentioning

confidence: 88%

Section: Doped Anatase Tio 2 With Large Percentage Of {001} Facetsmentioning

confidence: 99%

Section: Doped Anatase Tio 2 With Large Percentage Of {001} Facetsmentioning

confidence: 99%

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Specific Facets-Dominated Anatase TiO2: Fluorine-Mediated Synthesis and Photoactivity

2013

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“…Over the last five years, a number of methods have been developed for the metallization of HNTs. For example, Chu et al [27] and Geckler and Hasan [28] describe processes used to bind gold compounds to the surface of halloysite. Methods that load HNTs with copper [29,30] and silver [3] for use as an antibacterial agent have also been recently developed.…”

Section: Resultsmentioning

confidence: 99%

Dry Sintered Metal Coating of Halloysite Nanotubes

et al. 2016

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Abstract:Halloysite nanotubes (HNTs) are a naturally-occurring aluminosilicate whose dimensions measure microns in length and tens of nanometers in diameter. Bonding defects between the alumina and silica lead to net negative and positive charges on the exterior and interior lumen, respectively. HNTs have been shown to enhance the material properties of polymer matrices and enable the sustained release of loaded chemicals, drugs, and growth factors. Due to the net charges, these nanotubes can also be readily coated in layered-depositions using the HNT exterior lumen's net negative charge as the basis for assembly. These coatings are primarily done through wet chemical processes, the majority of which are limited in their use of desired chemicals, due to the polarity of the halloysite. Furthermore, this restriction in the type of chemicals used often requires the use of more toxic chemicals in place of greener options, and typically necessitates the use of a significantly longer chemical process to achieve the desired coating. In this study, we show that HNTs can be coated with metal acetylacetonates-compounds primarily employed in the synthesis of nanoparticles, as metal catalysts, and as NMR shift reagents-through a dry sintering process. This method was capable of thermally decaying the metal acetylacetonate, resulting in a free positively-charged metal ion that readily bonded to the negatively-charged HNT exterior, resulting in metallic coatings forming on the HNT surface. Our coating method may enable greater deposition of coated material onto these nanotubes as required for a desired application. Furthermore, the use of chemical processes using toxic chemicals is not required, thus eliminating exposure to toxic chemicals and costs associated with the disposal of the resultant chemical waste.

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“…Great efforts have been made and various photocatalysts have been explored in the past forty years. [1][2][3][4][5][6][7][8] However, the photocatalytic efficiency is still greatly limited by the poor response to visible light and the low separation efficiency of photogenerated charge carriers. Therefore, the exploration of new photocatalysts with enhanced efficiencies has emerged as an urgent and challenging task in the field of photocatalysis.…”

mentioning

confidence: 99%

Synthesis of Ag9(SiO4)2NO3 through a reactive flux method and its visible-light photocatalytic performances

Zhu¹,

Wang²,

Huang³

et al. 2015

APL Materials

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Ag9(SiO4)2NO3 was prepared by a reactive flux method. The structures, morphologies, and light absorption properties were investigated. Owing to the polar crystal structure, an internal electric field can be formed inside the material, which can facilitate the photogenerated charge separation during the photocatalytic process. Based on both the wide light absorption spectra and high charge separation efficiency originated from the polarized internal electric field, Ag9(SiO4)2NO3 exhibit higher efficiency over Ag3PO4 during the degradation of organic dyes under visible light irradiation, which is expected to be a potential material for solar energy harvest and conversion.

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Visible Light Responsive Nitrogen Doped Anatase TiO₂ Sheets with Dominant {001} Facets Derived from TiN

Cited by 573 publications

References 24 publications

Specific Facets-Dominated Anatase TiO2: Fluorine-Mediated Synthesis and Photoactivity

Specific Facets-Dominated Anatase TiO2: Fluorine-Mediated Synthesis and Photoactivity

Dry Sintered Metal Coating of Halloysite Nanotubes

Synthesis of Ag9(SiO4)2NO3 through a reactive flux method and its visible-light photocatalytic performances

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Visible Light Responsive Nitrogen Doped Anatase TiO2 Sheets with Dominant {001} Facets Derived from TiN

Cited by 573 publications

References 24 publications

Specific Facets-Dominated Anatase TiO2: Fluorine-Mediated Synthesis and Photoactivity

Specific Facets-Dominated Anatase TiO2: Fluorine-Mediated Synthesis and Photoactivity

Dry Sintered Metal Coating of Halloysite Nanotubes

Synthesis of Ag9(SiO4)2NO3 through a reactive flux method and its visible-light photocatalytic performances

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Visible Light Responsive Nitrogen Doped Anatase TiO₂ Sheets with Dominant {001} Facets Derived from TiN