(101)-Exposed Anatase TiO<sub>2</sub> Nanosheets

Peng, Chih Wei; Ke, Tsung Yin; Brohan, Luc; Richard‐Plouet, Mireille; Huang, Jianjun; Puzenat, E.; Chiu, Hsin‐Tien; Lee, Chi Young

doi:10.1021/cm071038e

Cited by 50 publications

(45 citation statements)

References 17 publications

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“…[16,17] The complex TiSi 2 nanostructures of orthorhombic symmetry that we present herein represent a far more complex 2D structure than those previously achieved.…”

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confidence: 66%

Spontaneous Growth of Highly Conductive Two‐Dimensional Single‐Crystalline TiSi₂ Nanonets

et al. 2008

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Simple nanostructures (e.g. nanowires) form complex nanomaterials when connected by single-crystalline junctions. [1,2] These nanomaterials offer better mechanical strength and superior charge transport while preserving unique properties associated with the small-dimension nanostructure. Tremendous research interest has focused on this new class of materials, especially in the field of electronics [3] and energy applications.[4] The synthesis of these materials is challenging because of their combined features of low dimensionality and high complexity; the former requires growth suppression whereas the latter demands growth enhancement.[5] Here we report our success in growing single-crystalline two-dimensional (2D) networks of TiSi 2 , a free-standing structure that is micrometers wide and long but only approximately 15 nm thick; beams of these networks are nanobelts % 25 nm wide. This new structure can serve as a testing grounds for probing a host of intriguing properties and applications, and the synthesis should inspire work on the growth of complex nanostructures in general.We were motivated to study TiSi 2 by its properties and potential applications as well as its unique crystal structures. TiSi 2 is an excellent electronic material as it is one of the most conductive silicides (resistivity % 10 mW cm). [6,7] TiSi 2 was also recently shown to be a good photocatalyst for splitting H 2 O by absorbing visible light, which is a promising approach toward solar-generated H 2 as a clean energy carrier.[8] The improved charge-transport properties offered by complex nanoscale structures of TiSi 2 are desirable for nanoelectronics and solar energy harvesting. Their chemical synthesis is thus appealing; however, the synthetic conditions required by the two key features of complex nanostructures, low dimensionality and complexity, seem to contradict each other. Growth of onedimensional (1D) features involves promoting additions of atoms or molecules in one direction while constraining those in all other directions; this is often achieved either by surface passivation to increase the energies of sidewall deposition (such as solution-phase synthesis) or by the introduction of impurities to lower the energies of deposition for the selected directions (most notably the vapor-liquid-solid mechanism). [9,10] Complex crystal structures, on the other hand, require controlled growth in more than one direction. The challenge in making 2D complex nanostructures is even greater as it demands more stringent controls over the complexity to limit the overall structure within two dimensions. Indeed, successful chemical syntheses of complex nanostructures have been mainly limited to 3D ones, [11][12][13][14] and demonstrations of 2D nanocrystals are less frequent. Yang et al., for instance, have reported a simple comblike ZnO nanostructure.[15] Multicrystalline nanosheets of tetragonal TiO 2 were also reported. [16,17] The complex TiSi 2 nanostructures of orthorhombic symmetry that we present herein represent a far more complex 2D str...

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“…[16,17] The complex TiSi 2 nanostructures of orthorhombic symmetry that we present herein represent a far more complex 2D structure than those previously achieved.…”

mentioning

confidence: 66%

Spontaneous Growth of Highly Conductive Two‐Dimensional Single‐Crystalline TiSi₂ Nanonets

et al. 2008

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“…All these synthesis routes utilise the same key concept, involving the use of NaOH in addition to the main titanium precursor. 32,33 All propose similar steps in the synthesis mechanism involving: (1) incorporation of Na + into the However, NaOH was not used as a precursor during the present LPCVD deposition of the thin films. However Na is a major constituent of soda lime glass and may contain up to 5 atom% Na 6 .…”

Section: Discussionmentioning

confidence: 99%

Synthesis and characterization of mixed phase anatase TiO₂ and sodium-doped TiO₂(B) thin films by low pressure chemical vapour deposition (LPCVD)

et al. 2014

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TiO 2 thin films were synthesized using Low Pressure Chemical Vapour Deposition (LPCVD) onto glass substrates. Titanium isopropoxide (TTIP) and N 2 gas were used as the precursor and carrier gas respectively. The effects of reaction temperature, carrier gas flow rate and deposited area were studied. SEM, TEM, powder XRD and UV-Vis and Raman spectroscopy were employed to characterize the phase and morphology of the synthesized materials. The results show that a dual phase (sodium-doped TiO 2 (B) and anatase) nanocrystalline thin film was successfully prepared by LPCVD with needle-and polygonal plate-shape crystallites respectively. At the interface with the substrate, the thin film deposit exhibited a preferr ed orientation of TiO 2 (B) needles in the [001] direction of average crystallite size 50-80 nm in length and 5-10 nm in width, whilst the crystallite size of anatase polygonal-plates was around 200 nm. The optimal LPCVD condition for preparing this mixed ph ase of TiO 2 was 550 o C (actual temperature) with a 1 mL/s N 2 flow rate. A possible mechanism for the mixed-phase formation by LPCVD on the glass substrates is described as well as the implications for the production of selfcleaning structures.

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“…TiO 2 crystallizes in three different phases: rutile, anatase, and brookite. Anatase TiO 2 -supported Au catalysts boast the highest catalytic activity among the three crystal phases (Benjamin and Graeme, 2010;Li et al, 2008a,b;Pillai et al, 2007;Yang et al, 2008;Peng et al, 2008). The unique catalytic performance of Au/TiO 2 catalysts has been attributed to the Au-TiO 2 perimeter interface, which contains activating sites for reactants (Fujitani and Nakamura, 2011).…”

Section: Introductionmentioning

confidence: 99%

Layered sphere-shaped TiO 2 capped with gold nanoparticles on structural defects and their catalysis of formaldehyde oxidation

Pang

et al. 2016

Journal of Environmental Sciences

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We describe here a one-step method for the synthesis of Au/TiO 2 nanosphere materials, which were formed by layered deposition of multiple anatase TiO 2 nanosheets. The Au nanoparticles were stabilized by structural defects in each TiO 2 nanosheet, including crystal steps and edges, thereby fixing the Au-TiO 2 perimeter interface. Reactant transfer occurred along the gaps between these TiO 2 nanosheet layers and in contact with catalytically active sites at the Au-TiO 2 interface. The doped Au induced the formation of oxygen vacancies in the Au-TiO 2 interface. Such vacancies are essential for generating active oxygen species (*O − ) on the TiO 2 surface and Ti 3+ ions in bulk TiO 2 . These ions can then form Ti 3+ -O − -Ti 4+ species, which are known to enhance the catalytic activity of formaldehyde (HCHO) oxidation.These studies on structural and oxygen vacancy defects in Au/TiO 2 samples provide a theoretical foundation for the catalytic mechanism of HCHO oxidation on oxide-supported Au materials.

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(101)-Exposed Anatase TiO₂ Nanosheets

Cited by 50 publications

References 17 publications

Spontaneous Growth of Highly Conductive Two‐Dimensional Single‐Crystalline TiSi₂ Nanonets

Spontaneous Growth of Highly Conductive Two‐Dimensional Single‐Crystalline TiSi₂ Nanonets

Synthesis and characterization of mixed phase anatase TiO₂ and sodium-doped TiO₂(B) thin films by low pressure chemical vapour deposition (LPCVD)

Layered sphere-shaped TiO 2 capped with gold nanoparticles on structural defects and their catalysis of formaldehyde oxidation

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(101)-Exposed Anatase TiO2 Nanosheets

Cited by 50 publications

References 17 publications

Spontaneous Growth of Highly Conductive Two‐Dimensional Single‐Crystalline TiSi2 Nanonets

Spontaneous Growth of Highly Conductive Two‐Dimensional Single‐Crystalline TiSi2 Nanonets

Synthesis and characterization of mixed phase anatase TiO2 and sodium-doped TiO2(B) thin films by low pressure chemical vapour deposition (LPCVD)

Layered sphere-shaped TiO 2 capped with gold nanoparticles on structural defects and their catalysis of formaldehyde oxidation

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Product

Resources

About

(101)-Exposed Anatase TiO₂ Nanosheets

Spontaneous Growth of Highly Conductive Two‐Dimensional Single‐Crystalline TiSi₂ Nanonets

Spontaneous Growth of Highly Conductive Two‐Dimensional Single‐Crystalline TiSi₂ Nanonets

Synthesis and characterization of mixed phase anatase TiO₂ and sodium-doped TiO₂(B) thin films by low pressure chemical vapour deposition (LPCVD)