Preparation and photoluminescence of highly ordered TiO2 nanowire arrays

Lei, Yong; Zhang, Lide; Meng, Guowen; Li, Guanghai; Zhang, Xinyi Y; Liang, Changhao; Chen, W; Wang, S X

doi:10.1063/1.1350959

Cited by 603 publications

(263 citation statements)

References 20 publications

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“…24 TiO 2 nanotubes have been used as hydrogen sensors, 25 dye sensitized solar cells, 26 and have displayed photoluminescence properties. 27 Many inorganic layered nanotubes have shown the ability to intercalate lithium, hydrogen, and magnesium, [28][29][30][31][32][33][34][35][36][37] indicating potential as energy storage materials.…”

Section: Introductionmentioning

confidence: 99%

Polygonal model for layered inorganic nanotubes

2009

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Multiwalled inorganic nanotubes with circular cross sections must have either an incoherent interface or a large amount of strain. However, nanotubes with a polygonal cross section can have a coherent interface with considerably less strain. We present a model for polygonal nanotubes with no defects where the chirality of the nanotube determines the shape of the cross section. Circular and polygonal nanotubes are compared based on their strain energy and interfacial energy. We have used first-principles calcuations to parameterize strain and interfacial energy for TiS 2 nanotubes. These calculations show that the polygonal model is energetically favorable to the circular model when the inner radius is above a critical radius, 6.2 Å for a TiS 2 nanotube with ten layers. These results should provide insight into further investigations of nanotube structure and allow computational studies to more accurately predict nanotube properties.

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Section: Introductionmentioning

confidence: 99%

Polygonal model for layered inorganic nanotubes

2009

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“…Apart from this peak, there are four visible emission peaks. The emission peaks are mostly associated with excitons and oxygen defect related shallow and deep trap centers (Lei et al 2001;Choudhury and Choudhury 2013). The emission at 431 nm is due to self-trapped exciton (STE) (Lei et al 2001).…”

Section: Uv-vis Absorption Studymentioning

confidence: 99%

Shallow and deep trap emission and luminescence quenching of TiO2 nanoparticles on Cu doping

2013

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TiO 2 nanoparticles with 2 and 4 % Cu are synthesized by sol-gel method. The crystalline phase and size of the nanoparticles are investigated with X-ray diffraction and transmission electron microscope. Cu-doped TiO 2 has an extended absorption ranging from UV to visible region. Doping of Cu disturbs the arrangement of oxygen ions around Ti 4? and generates oxygen vacancies. These oxygen vacancies capture electrons and form some ionized oxygen vacancy centers or F centers. These F centers form subband states extending from shallow to the deep level in the band gap of TiO 2 . The visible emission peaks of pure and doped TiO 2 are mainly associated with self-trapped excitons (STEs) and F centers. We have observed that Auger type nonradiative recombination is responsible for the quenching of the UV and STE emission peak in the doped samples. The intense visible emission peaks in pure TiO 2 are due to shallow type centers whereas deep trap emission is predominant in doped samples. The intensity of UV and visible emission peaks are quenched with the increase in the doping level of Cu. Defects, Cu dstates, band structure of TiO 2 and low mobility of the carriers are responsible for the quenching of the emission peaks.

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“…The shifts may be caused by the surface charge at the interface between the electrode and KNN, and/or the space charge stored in the AAO template walls. 35,36 Further investigations concerning the impact brought by size and shape of KNN nanotubes such as diameter, wall thickness and aspect ratio on ferroelectric properties are in progress.…”

Section: Resultsmentioning

confidence: 99%

Synthesis, characterization and ferroelectric properties of lead-free K0.5Na0.5NbO3 nanotube arrays

Zhou

et al. 2011

Journal of Applied Physics

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Lead-free K 0.5 Na 0.5 NbO 3 (KNN) nanotube arrays were synthesized by a sol-gel method with anodic aluminum oxide templates. The obtained KNN nanotubes exhibited a polycrystalline and monoclinic perovskite structure with diameters of 200 nm and wall thickness of 30-40 nm, respectively. The polarization-electric loop curve of the nanotubes array were examined showing the values of 2P r and 2E c at about 3.4 lC/cm 2 and 13 kV/cm, respectively, under a maximum electric field of 12.5 kV/cm. The piezoelectric characteristics of individual KNN nanotube array was also identified through piezoresponse force microscopy.

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Preparation and photoluminescence of highly ordered TiO2 nanowire arrays

Cited by 603 publications

References 20 publications

Polygonal model for layered inorganic nanotubes

Polygonal model for layered inorganic nanotubes

Shallow and deep trap emission and luminescence quenching of TiO2 nanoparticles on Cu doping

Synthesis, characterization and ferroelectric properties of lead-free K0.5Na0.5NbO3 nanotube arrays

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